tag:blogger.com,1999:blog-226828442024-03-13T14:48:44.794+01:00PD7MAA HOMEPAGEThis is a updated collection of easy projects for radioamateurs and swl's. See all of my projects at OLDER POSTS down on this blog.
Enjoy,73 JohnUnknownnoreply@blogger.comBlogger18125tag:blogger.com,1999:blog-22682844.post-67548437413420171542018-04-24T14:54:00.002+02:002018-04-25T10:15:56.717+02:00Yaesu VX-3 double battery ideaA small radio has a small battery so i came up with this idea. A battery case for AA size batteries is available on the net . By removing all inside material with a Dremel tool enough space is created to hold 2 Li-ion batteries in parallel. Two thin brass strips can be used to solder the packs together resulting in a 2800 mA powerpack. Be sure that the two cells are fully loaded before soldering them in parallel. Look for Fuji NP60 batteies on ebay , they are simply glued together .Some foam rubber is needed to fill up the extra space between the pack and the cover.<br />
Those who don't like to solder a battery can glue the 2 cells in anti parallel. You need to flip the pack if one cell is emty. <br />
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<a href="https://1.bp.blogspot.com/-434lP5j_szg/Wt8liEdXOnI/AAAAAAAACuI/Oea--T9bizccHrxUklOIIfwB62fCSLueACLcBGAs/s1600/YAESU-FBA-37-Battery-Case-for-VX.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="367" data-original-width="510" height="460" src="https://1.bp.blogspot.com/-434lP5j_szg/Wt8liEdXOnI/AAAAAAAACuI/Oea--T9bizccHrxUklOIIfwB62fCSLueACLcBGAs/s640/YAESU-FBA-37-Battery-Case-for-VX.jpg" width="640" /></a></div>
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<tr><td style="text-align: center;"><a href="https://4.bp.blogspot.com/-5v0hPUKZhrM/Wt8nF4wPSsI/AAAAAAAACuU/8uJcWdpgVDsIgxlGYzYCACpCthSBRvj-gCLcBGAs/s1600/twinpack.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1065" data-original-width="1236" height="550" src="https://4.bp.blogspot.com/-5v0hPUKZhrM/Wt8nF4wPSsI/AAAAAAAACuU/8uJcWdpgVDsIgxlGYzYCACpCthSBRvj-gCLcBGAs/s640/twinpack.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Before soldering</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Flip pack </td></tr>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-9245443810062057662017-08-25T11:03:00.000+02:002018-02-20T20:28:55.499+01:00QRP labs QCX 5 Watt cw trx kit<div class="separator" style="clear: both; text-align: center;">
<a href="https://1.bp.blogspot.com/-qAwFQnHNbVw/WZ_ktATxdZI/AAAAAAAACiI/81i3IwfiL7w3awUO7NKzhhW2gs9arzrnQCLcBGAs/s1600/cw%2Btrx.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="470" data-original-width="720" height="416" src="https://1.bp.blogspot.com/-qAwFQnHNbVw/WZ_ktATxdZI/AAAAAAAACiI/81i3IwfiL7w3awUO7NKzhhW2gs9arzrnQCLcBGAs/s640/cw%2Btrx.jpg" width="640" /></a></div>
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Here is my new winter project: <a href="http://qrp-labs.com/qcx.html">http://qrp-labs.com/qcx.html </a><br />
I couldn't resist buying this little 10 x 8 cm gem with a lot of features for just 49 $ <br />
<br />
The two SMD ICs are already factory pre-soldered.<br />
Compleet unit size incl. spacers : 101.6mm x 81.3mm x 34mm.<br />
<br />
A little gem needs a nice encclosure.<br />
A nice 110x88x38mm enclosure for this transceiver can be found on eBay : <a href="http://www.ebay.com/itm/Split-body-Extruded-Aluminum-Box-Enclosure-Case-Project-electronic-DIY-110-88-38/380955959898?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D45728%26meid%3D43bf45d8db544dbaa54e6904f2953a22%26pid%3D100005%26rk%3D1%26rkt%3D6%26mehot%3Dpp%26sd%3D171357381954&_trksid=p2047675.c100005.m1851">Link</a><br />
The grooves for the pcb are not used and have to be reduced about 2mm near the volume potentiometer and the pcb pylons. Also the groove at the LCD side may touch the soldering pads of the LCD . The PCB is mounted on the original 12mm pylons. These pylons are held by <span class="deel4">countersunk headed bolts to the lower cover. So to open the enclosure, remove the two knobs and the upper 4 screws of the side panels. To prevent stress to the PCB , the huge plastic BNC connector is replaced by a metall chassis-mounted type. This will automatically ground the enclosure.😉</span><br />
By means of a shaft extender the difference in height of the controls is matched.<br />
<span style="color: red;">Don't use the standard BNC connector from the kit. The PCB will be off centre.</span> <br />
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<tr><td class="tr-caption" style="text-align: center;">Making markings for 3mm holes.</td><td class="tr-caption" style="text-align: center;"><br /></td><td class="tr-caption" style="text-align: center;"><br /></td><td class="tr-caption" style="text-align: center;"><br /></td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Making space for the potentiometer and pylons</td><td class="tr-caption" style="text-align: center;"><br /></td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Pylons fitted<br />
Removing the groove in the cover is verry easy. By carving into the
alloy as the picture shows the material weakens and can be removed with a
small srewdriver . </td><td class="tr-caption" style="text-align: center;"><br /></td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Perfect fit😎<br />
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<div class="DefangedMsoNormal">
At last the controls of the QRX are fixed. I had 2 extended push buttons in stock as wel as some cheap plastic potentiometers. The shafts were cut of and appeared to be hollow. A 1/8( 3mm) drill was used to enlarge the shaft inside for aprx. 2mm.</div>
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Next the shaft was pushed over the button’s shaft and fixed with superglue.</div>
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The original potentiometer was
replaced by a longer one . A simple pice of modified shaft and a small
pice of plastic tube were used to extend the encoder shaft.<br />
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QCX mods : <a href="https://qrp-labs.com/qcx/qcxmods.html">https://qrp-labs.com/qcx/qcxmods.html</a><div class="blogger-post-footer">
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-1457595676669044562017-01-20T15:25:00.001+01:002017-08-26T07:51:48.689+02:00EFHW antenna for 40-10m qrpI had a BN43-202 core in stock and attempted to try to create a small QRP EFHW transformer from 7 - 29 MHz. As you can see in the plot the swr is verry flat from 40-10m so a capacitor at the input is not needed. A 3300 Ohm resister to ground was used for the plot but at 1700 Ohm the transformation is near perfect. Don't use thin antennawire for this rises the impedance of the antenna. 1.5mm is a minimum . With just 20.3m wire this makes a nice 40-10m antenna. You can also use the 34uH coil of the endfed down this blog to create a compact 3 band atenna of just 12m long. 10 Watts PEP is the max. power here. Be carefull, each pass is 1 turn here. A test with 2 transformers back to back showed a power loss of about 18% on 20m. I used 0.7mm transformer wire .<br />
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-77189281368185784882016-11-12T14:39:00.001+01:002020-01-06T17:29:58.687+01:00DIY kits 70W SSB linear HF Power Amplifier For YAESU FT-817 KX3 It's time for a new project. <a href="http://www.ebay.com/itm/DIY-kits-70W-SSB-linear-HF-Power-Amplifier-For-YAESU-FT-817-KX3/182254657820?_trksid=p2047675.c100012.m1985&_trkparms=aid%3D777003%26algo%3DDISCL.MBE%26ao%3D1%26asc%3D39107%26meid%3D78635634448e4165a6ef87496c266769%26pid%3D100012%26rk%3D2%26rkt%3D12%26sd%3D112170640292">eBay link to the seller</a> <br />
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My first impression : High quality PCB ( 100 x 50mm ) , all parts in the kit including 2 power FETs type IRF530N. Capacitors are 10nF instead of 100nF as shown in the schematic but that's not a problem. The 0.5 turns windings are on the PCB by means of the tubes inside the toroids. Supports for the transformers need to be cut out of the pcb. Construction is easy but a lowpass filter for each band is mandatory. I used the low pass data from W3NQN for a 7 element Chebyshev with standard value silver mica capacitors and T68-6 toroids. The provided wire for the power chocke ( 2 turns ) has a weak coating . It's better to replace it to avoid shortcuts .Start soldering the small parts and end with the transformers. Turn the potentiometer anti clockwise and slowly adjust the bias to aprox. 3.7V. I replaced the FETs by a pair of IOR IRF530N resulting in more stabillety en less input SWR however the input swr is highly effected by the drive power . At 5 Watt the swr mounts to over 1:3... . Best results with this PA are obtained on CW and FM .<br />
The test was in the original configuration at 13.8V and 5Watt FM input from my FT-817. Max. power was 80 Watt . At 3 Watt input the output was about 50 Watt at 20m. but the modulation was as expected distorded in ssb mode at the recommended 2.7V bias voltage.<br />
At 3.7V ( gate ) bias the modulation is acceptable but far from perfect. The 150 Ohm resistors over the FETs heat up strongly at full power FM. It's better to reduce the drive power to 2 Watt when working 12V FM/AM . Don't reduce the drive by reducing the Bias voltage for this results in a distorted modulation in SSB mode. Better use a power attenuator : <a href="http://pa1b-qrp.blogspot.nl/p/power-attenuator-calculator.html">Power att. calculator PA1B</a><br />
Unfortionally the seller often forgets to add the documentation, the picture shows a copy of the original pdf file. <br />
A You Tube impression by KC2IRV : <a href="https://www.youtube.com/watch?v=CeegQYZ25J0">Overall impression of the amplifier</a><br />
<a href="https://www.youtube.com/watch?v=Z4hVeBQ7iTw">Testing the PA </a><br />
Visit the blog of John DK9JC for a nice test :<a href="https://www.dk9jc.de/blog/equipment/142-diy-kits-70w-ssb-linear-hf-power-amplifier-ft-817-kx2-kx3"> Link</a> <br />
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Conclusion : This is a nice kit with acceptable results for a low price. For best results reduce the drive power to 2.5 Watt.<br />
swr at 5 Watt input : 1:3+. swr at 2.5 Watt input 1:1.8 with more than 50 Watt output. This is more than enough for fieldwork.<br />
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Better input swr update by OE1CGS : <a href="http://www.oe1cgs.at/wp-content/uploads/2018/02/50W-HF-PA.pdf">Link</a> I had a 18 Ohm 3 Watt resistor in stock, the swr is near perfect on 20m. at 5 Wattt input (-: The output has dropped to 50 Watts , more than enough on a good antenna.<br />
OE1CGS found these values for the missing R6 over the input transformer for a low input swr. Use a carbon or metal foil resistor .<br />
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<tr><td class="tr-caption" style="text-align: center;">Input swr measurements by OE1CGS</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">copy of the original pdf file</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">I used 0,8 mm transformer wire</td></tr>
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A second amplifier was build without cooling fan . You can clearly see the 7 element filter for 20m</div>
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.The enclosure comes from eBay : <a href="http://www.google.com/url?q=http%3A%2F%2Fwww.ebay.com%2Fitm%2FDIY-Aluminum-Project-Box-Enclosure-Electronic-Case-Silver-110X76X46mm-L-W-H-%2F330969755680%3Fhash%3Ditem4d0f55b020&sa=D&sntz=1&usg=AFQjCNFiu9YM2K72CRURm7DQ7ByCHappZA">Link</a></div>
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The heatsink also comes from eBay: <a href="http://www.google.com/url?q=http%3A%2F%2Fwww.ebay.com%2Fitm%2F100X69X36mm-Heatsink-Aluminum-Heat-Sink-Fit-For-LED-Transistor-IC-Module-Power-%2F331980177750%3Fhash%3Ditem4d4b8f8156&sa=D&sntz=1&usg=AFQjCNGUDfJwB-YWs9dnF7FpMZa9DDmoHw">Link</a></div>
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<tr><td class="tr-caption" style="text-align: center;">35mm cooling fans installed with LM-317 speed controll.</td></tr>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-18456718542577644922016-02-14T12:01:00.002+01:002017-03-29T04:44:16.012+02:00Wall Loop 20m. <div class="separator" style="clear: both; text-align: center;">
<a href="https://4.bp.blogspot.com/-oeRi1OWk8fk/VsBawNNoZ2I/AAAAAAAABVc/jvIt23l8Ips/s1600/wall%2Bloop%2B14%2BMHz.bmp" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="603" src="https://4.bp.blogspot.com/-oeRi1OWk8fk/VsBawNNoZ2I/AAAAAAAABVc/jvIt23l8Ips/s640/wall%2Bloop%2B14%2BMHz.bmp" width="640" /></a></div>
A stealth solution for apartments .<br />
This max. size open loop antenna for 14 MHz with a totall circumference of 6m. ( 19.68 feet ) is designed to attach to a wall . Not sutable for reenforced concrete walls . It has a no tune bandwidth of more than 300 KHz with a centre swr of 1 : 1.1. A capacitor was put over the feedpoint to shunt up the feedpoint impedance. The 150 pF parallel capacitor was the best value in my situation ( brick wall ) but can be replaced by a 500 pF tuning capacitor in order to find the lowest SWR at resonance in any setup. First contacts gave good reports in Europe. Although a lot of the hf power is absorbed by the wall, the results are surprisingly good. A test was made with 100 Watts without arcing however 5 Watts are more than enough for indoor use...<br />
The top capacitor is made of twisted pvc coated antenna wire or a piece of 25cm RG-213 coax and is cut for tuning to the frequency . This antenna can also be build on a fibreglass or wooden frame in a diamond shape for field or attic use. Loop circumference for other bands:<br />
30m : 7m <br />
20m. : 6m<br />
17m. : 4.8m<br />
15m. : 4.2m<br />
12m. : 3.5m<br />
10m. : 3m<br />
Tuning steps : Change the length or the turns of the top capacitor to tune the loop to the desired frequency then put a 500 pF tuning capacitor over the feedpoint and look for the lowest swr.<br />
You can replace this capacitor by a fixed type.<br />
Follow the thread on QRZ.com :<a href="https://forums.qrz.com/index.php?threads/wall-loop-20m.511714/">https://forums.qrz.com/index.php?threads/wall-loop-20m.511714/</a><br />
See de Walloop at DK9JC : <a href="https://www.dk9jc.de/blog/equipment/128-20m-indoor-loop-nach-pd7maa">https://www.dk9jc.de/blog/equipment/128-20m-indoor-loop-nach-pd7maa</a> <br />
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<tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-3O2A0Bh81V8/VsBeHhu47II/AAAAAAAABVo/dJEmpnhSKd4/s1600/walloop%2Bcapacitor.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="406" src="https://1.bp.blogspot.com/-3O2A0Bh81V8/VsBeHhu47II/AAAAAAAABVo/dJEmpnhSKd4/s640/walloop%2Bcapacitor.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">The capacitor . A piece of RG-213 coax can also be used</td></tr>
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<tr><td style="text-align: center;"><a href="https://2.bp.blogspot.com/-GuG8e3m38Hw/VsBebRr9fII/AAAAAAAABVs/k9_LItVCAjk/s1600/20m.%2Bwalloop%2B150pF%2Bat%2Bfeedpoint.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="640" src="https://2.bp.blogspot.com/-GuG8e3m38Hw/VsBebRr9fII/AAAAAAAABVs/k9_LItVCAjk/s640/20m.%2Bwalloop%2B150pF%2Bat%2Bfeedpoint.jpg" width="422" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Verry good SWR </td></tr>
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<tr><td style="text-align: center;"><a href="https://1.bp.blogspot.com/-7e00QGlluco/VsHPLNBVbDI/AAAAAAAABWE/fG2lWc1gO-c/s1600/feedpoint%2Bwith%2Bline%2Bchoke.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="640" src="https://1.bp.blogspot.com/-7e00QGlluco/VsHPLNBVbDI/AAAAAAAABWE/fG2lWc1gO-c/s640/feedpoint%2Bwith%2Bline%2Bchoke.jpg" width="480" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Feedpoint with 100pF and 47pF in parallel. Notice the line choke.</td></tr>
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<tr><td style="text-align: center;"><a href="https://2.bp.blogspot.com/-Qq5LiM8Gc3U/VvppGahQeVI/AAAAAAAABWU/bMb4NZN5L6cl1ZzMNkAUE1ILw3zvd5gpw/s1600/c.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="https://2.bp.blogspot.com/-Qq5LiM8Gc3U/VvppGahQeVI/AAAAAAAABWU/bMb4NZN5L6cl1ZzMNkAUE1ILw3zvd5gpw/s640/c.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">The loop made by SP3BGD</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">SP3BGD feedpoint capacitor for wide range use</td></tr>
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<tr><td style="text-align: center;"><a href="https://3.bp.blogspot.com/-aLRrOATwjQE/V-os-mYXghI/AAAAAAAABX8/Z5PcY1uvUH85U1iyoSCuIo2C7Qx_FfcjwCLcB/s1600/DB9MAT.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="640" src="https://3.bp.blogspot.com/-aLRrOATwjQE/V-os-mYXghI/AAAAAAAABX8/Z5PcY1uvUH85U1iyoSCuIo2C7Qx_FfcjwCLcB/s640/DB9MAT.jpg" width="480" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">The loop at DB9MAT</td></tr>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-84135950538019477472015-02-11T12:22:00.001+01:002015-03-14T13:10:08.567+01:001:4 Voltage balun 3.5 - 30 MHz<div class="separator" style="clear: both; text-align: center;">
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<a href="http://4.bp.blogspot.com/-c75157a1VcY/VNyBvKZiwNI/AAAAAAAABJM/8pfkE39mzc8/s1600/balun%2B1%2Bto%2B4.BMP" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-c75157a1VcY/VNyBvKZiwNI/AAAAAAAABJM/8pfkE39mzc8/s1600/balun%2B1%2Bto%2B4.BMP" height="632" width="640" /></a></div>
<a href="http://1.bp.blogspot.com/-gztEKKuDkY4/VNs6-dkt2bI/AAAAAAAABIw/tzwCYkyFb2I/s1600/1%2Bto%2B4%2Bvoltage%2Bbalun%2Bwith%2B8%2Bturns%2Bon%2B4c65.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://1.bp.blogspot.com/-gztEKKuDkY4/VNs6-dkt2bI/AAAAAAAABIw/tzwCYkyFb2I/s1600/1%2Bto%2B4%2Bvoltage%2Bbalun%2Bwith%2B8%2Bturns%2Bon%2B4c65.png" height="484" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Flat SWR from 3.5 to 30 MHz with 8 double turns on a 4C65 or FT140-61 toroid.<br />
SWR 1: 1.1 in the centre. </td></tr>
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The 4C65 was used because it was in stock . A FT240-43 with 12 turns wil provide a almost flat range from 160 - 10m. <div class="blogger-post-footer">
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-23134339817938617062014-08-22T16:39:00.000+02:002015-12-02T13:58:32.635+01:00Single knob Travelloop 6.5 - 31 MHz<div class="separator" style="clear: both; text-align: center;">
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<a href="http://1.bp.blogspot.com/-2FogBToW9uc/VN3ZOcn654I/AAAAAAAABJc/i2sjiQmW3Mg/s1600/travelloop%2Bmono%2Bver.2.JPG" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="640" src="http://1.bp.blogspot.com/-2FogBToW9uc/VN3ZOcn654I/AAAAAAAABJc/i2sjiQmW3Mg/s1600/travelloop%2Bmono%2Bver.2.JPG" width="576" /></a><a href="http://1.bp.blogspot.com/-2FogBToW9uc/VN3ZOcn654I/AAAAAAAABJc/i2sjiQmW3Mg/s1600/travelloop%2Bmono%2Bver.2.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"></a></div>
This small loop can handle 20 Watts from 45-10m . Loop circumference is 2.5 m with a Faraday coupling loop of 50 cm . Sticks are 6 mm glass fibre ( kiteshop).The 2 vertical sticks are 41cm and the suports are 34cm long. A 2 x 500 Pf tuning capacitor with the sections put in series is used for tuning. Because of the high Q a 1:3 reduction is convenient but not mandatory . The loop is made of RG-213 with the shield and centre soldered together. Highest SWR is 1:1.5 . Despite of bad conditions, first contacts were made troughout Europ with 10 Watts SSB. Meanwhile contacts were made with 5 Watts SSB over the Atlantic including the Caribic , Brasil , USA ands. See the list below. The Faraday coupling loop is made of RG-58 and is bend to a slightly horizontal oval, reducing the space between the loops that leads to a drastic improvement of the swr / return loss.<br />
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<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-0lj0NuLhXnc/VBbdVcIfU4I/AAAAAAAAA_U/kcNGh_xWDhc/s1600/40m%2Bplot.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="http://3.bp.blogspot.com/-0lj0NuLhXnc/VBbdVcIfU4I/AAAAAAAAA_U/kcNGh_xWDhc/s1600/40m%2Bplot.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">40m PLOT</td></tr>
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<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-sNMJfcexqVc/U_hyf5upjZI/AAAAAAAAA54/di0WpaH3ABw/s1600/loop%2Bplot%2B20m.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="http://3.bp.blogspot.com/-sNMJfcexqVc/U_hyf5upjZI/AAAAAAAAA54/di0WpaH3ABw/s1600/loop%2Bplot%2B20m.png" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Plot 14.200MHz after coupling loop modification.<br />
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<a href="http://3.bp.blogspot.com/-P0agLN9qfu4/VBbdlxLKlXI/AAAAAAAAA_c/jt-uVukDhS8/s1600/10m%2Bplot.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="481" src="http://3.bp.blogspot.com/-P0agLN9qfu4/VBbdlxLKlXI/AAAAAAAAA_c/jt-uVukDhS8/s1600/10m%2Bplot.png" width="640" /></a></div>
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<tr><td style="text-align: center;"><a href="http://4.bp.blogspot.com/-iFCECQXkvmU/U_tbkdP_1LI/AAAAAAAAA6Y/gCCITPa2h2s/s1600/improved%2Bcoupling.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="384" src="http://4.bp.blogspot.com/-iFCECQXkvmU/U_tbkdP_1LI/AAAAAAAAA6Y/gCCITPa2h2s/s1600/improved%2Bcoupling.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Improved coupling by reducing the space between the loops . I used a piece of U-shaped plastic for the looprest.</td><td class="tr-caption" style="text-align: center;">. </td><td class="tr-caption" style="text-align: center;"><br /></td></tr>
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Although fast tuning is a big plus with this loop, the overall efficiency is less than the twin capacitor Travelloop further down on this blog. The broadband coupling loop makes a perfect match impossible. A perfect match can only be made with a 2 capacitor coupling . The efficiency on 40m. is only about 5% but enough for cw. The fun realy starts at 30m. and up. On 20m.the performance is verry acceptable . On 10m.efficiency equals a full size 10m. band dipole and amazing contacts can be made with a verry low noiselevel.<br />
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<tr><td style="text-align: center;"><a href="http://1.bp.blogspot.com/-26mwE44aNn0/VA3oqD80aPI/AAAAAAAAA-M/oD_UOrXmdJw/s1600/ready%2Bto%2Btravel.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="http://1.bp.blogspot.com/-26mwE44aNn0/VA3oqD80aPI/AAAAAAAAA-M/oD_UOrXmdJw/s1600/ready%2Bto%2Btravel.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">READY TO TRAVEL</td></tr>
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<tr><td style="text-align: center;"><a href="http://2.bp.blogspot.com/-OnD1Gh6wYAQ/VIAtaSVRcEI/AAAAAAAABEE/G_89xVbfo1g/s1600/holliday%2Bshack.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="http://2.bp.blogspot.com/-OnD1Gh6wYAQ/VIAtaSVRcEI/AAAAAAAABEE/G_89xVbfo1g/s1600/holliday%2Bshack.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">HOLIDAY SHACK</td></tr>
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Some september 2014 holiday QSO's made with my FT-817 and 5 Watts PEP ssb mainly on the 10m band :<br />
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<a href="http://4.bp.blogspot.com/-yTvAvlN8NFc/VTJrPL4P94I/AAAAAAAABNY/B4j7Tz2XISE/s1600/Loop%2Bqso%27s%2Bsept%2B2014.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="326" src="http://4.bp.blogspot.com/-yTvAvlN8NFc/VTJrPL4P94I/AAAAAAAABNY/B4j7Tz2XISE/s640/Loop%2Bqso's%2Bsept%2B2014.png" width="640" /></a></div>
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HB9AYR made a verry nice copy of the Travelloop Mono . Enter his call at QRZ.com to get more info:</div>
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<a href="https://www.qrz.com/lookup">https://www.qrz.com/lookup</a></div>
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<tr><td class="tr-caption" style="text-align: center;">HB9AYR Travelloop Mono</td></tr>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-14711298822329300642014-02-04T01:01:00.000+01:002018-03-30T11:40:33.539+02:00Mini Travelloop for receiversPortable shortwave receivers are normally equiped with short telescopic whip antennas producing a poor reception. This option has more selectivity and a better impedance (low Z) over the 6.8-31 MHz range.<br />
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<span style="color: blue;"><span style="color: black;">The design uses a single 15-520 pF type tuning capacitor combined with a FT37-43 toroid having 7 turns on the coax side. The loop is made of 3mm brass wire 1m long. Use only plastic enclosures. Tuning range is 6.8 - 31 MHz with oustanding performance. This is also a verry good direction finding antenna. A RG-213 loop of 130 cm gives a higher Q with much stronger signals. </span></span><br />
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<a href="http://4.bp.blogspot.com/-w0a9T8FpOPk/VnVMWdmd8jI/AAAAAAAABUM/47EiOu2IZcA/s1600/peilloop%2B010.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="334" src="https://4.bp.blogspot.com/-w0a9T8FpOPk/VnVMWdmd8jI/AAAAAAAABUM/47EiOu2IZcA/s640/peilloop%2B010.jpg" width="640" /></a></div>
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<tr><td class="tr-caption" style="text-align: center;">The coupling by a FT37-43 with 7 turns<br />
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The small loop in action on 80m. by switching a 1200pF capacitor over the tuning capacitor</div>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-82902224234827482062013-10-16T16:40:00.000+02:002013-12-03T11:53:03.318+01:00Broad band 1:1 current/choke balun<div class="separator" style="clear: both; text-align: center;">
<a href="http://2.bp.blogspot.com/-ayUGqEVIxbM/Up23v3QddWI/AAAAAAAAAxs/-Avls1faXO0/s1600/balun.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-ayUGqEVIxbM/Up23v3QddWI/AAAAAAAAAxs/-Avls1faXO0/s1600/balun.jpg" height="640" width="588" /></a></div>
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In search of a no nonsence 1:1 balun i came up with this easy to build unit. It offeres a almost flat swr curve from 1 to 30 MHz as you can see in the plot. Use 10 turns of side by side1 mm enamelled copper wire on a 4C65 or FT140-61 toroid . Teflon tape was used on the toroid but this is not essential. <br />
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<a href="http://2.bp.blogspot.com/-uHPBvXa_A3g/Ul6kvybChbI/AAAAAAAAArI/EvhS83-5Zi4/s1600/swr+plot+1to1+balun.png" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-uHPBvXa_A3g/Ul6kvybChbI/AAAAAAAAArI/EvhS83-5Zi4/s640/swr+plot+1to1+balun.png" height="480" width="640" /></a></div>
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SWR plot of the balun bridged with a 50 Ohm resistor.<div class="blogger-post-footer">
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<a href="http://4.bp.blogspot.com/-C5csBdzhLAE/UkGIcObOtDI/AAAAAAAAAp0/JoSzNT9MJKE/s1600/endfed+high+pass+20m.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-C5csBdzhLAE/UkGIcObOtDI/AAAAAAAAAp0/JoSzNT9MJKE/s640/endfed+high+pass+20m.PNG" height="640" width="482" /></a></div>
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<![endif]--><span lang="EN-GB" style="mso-ansi-language: EN-GB;">A common
problem with qrp transceivers is a weak frontend . Most end fed antennas use
low pass tuners causing high stress due<span style="mso-spacerun: yes;">
</span>to strong signals coming from BC stations .</span><br />
<div class="MsoNormal">
<span lang="EN-GB" style="mso-ansi-language: EN-GB;">The High
pas tuner used here helps to reduce these problems. Put 19 turns 1mm
transformer wire on a T130-6 torroid to form a 4.8 uH coil. The trimmer used is
a 60pF type set to about 25pF .<span style="mso-spacerun: yes;"> </span>Put a
3.3K resistor between the antenna connector and the ground of the coax
connector and </span><span lang="EN-GB" style="mso-ansi-language: EN-GB;">tune the trimmer for resonance at 14.180 MHz. Keep in mind that a thin antenna wire has a higher Z.</span></div>
<span lang="EN-GB" style="font-family: "Times New Roman"; font-size: 12.0pt; mso-ansi-language: EN-GB; mso-bidi-language: AR-SA; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: NL;">After tuning the unit connect the half Lambda wire ( 10.15m PVC covered stranded copper wire) and cut it for lowest swr. </span><span lang="EN-GB" style="mso-ansi-language: EN-GB;">A<span style="mso-spacerun: yes;"> </span>1:1.2 swr is easily obtained with this
unit. </span><span lang="EN-GB" style="mso-ansi-language: EN-GB;">The cabinet is a PVC type G302 made by Velleman. </span>Every end fed / vertical needs some kind of counterpoise to push
against and in this case that's the coax , so don't forget a line choke
near to your transceiver.<br />
<br />
<div class="separator" style="clear: both; text-align: center;">
<a href="http://4.bp.blogspot.com/-frdgl7SBzQE/UkJ3lPZZq9I/AAAAAAAAAqU/-66rgIB-cFM/s1600/endfed+highpass+20m.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://4.bp.blogspot.com/-frdgl7SBzQE/UkJ3lPZZq9I/AAAAAAAAAqU/-66rgIB-cFM/s640/endfed+highpass+20m.jpg" height="480" width="640" /></a></div>
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<a href="http://4.bp.blogspot.com/-U9fMSyeHvMY/UjQIJUsP1aI/AAAAAAAAAoo/nrlTwDukzn8/s1600/iler+20+qrp.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="518" src="https://4.bp.blogspot.com/-U9fMSyeHvMY/UjQIJUsP1aI/AAAAAAAAAoo/nrlTwDukzn8/s640/iler+20+qrp.PNG" width="640" /></a></div>
My Iler 20 is finally oparational. The IF has changed
to 4.000 MHz and the vxo has 10.250 MHz crystals.(Ebay) The VXO coil
now holds 64 turns no.26 (0.31mm) magnet wire and the tuning range with
the polyvaricon is 14.129 - 14.246.4 MHz with a stable signal . C15-C18 in the 4 MHz cristal filter are replaced by10 pF to give a clear audio on rx and tx. As you can see, even the microphone was to bulky and was replaced by a home made model. Audio sounds verry good and the rf power is 6 Watts PEP at 13.8V. Also C28 was lowered to 33nF to get more high tones in the audio output, but that's a question of personal taste. I found a perfect little speaker named : Visaton K 50 WP , 3 Watt 8 Ohm art.nr.:2915 that gives a real boost to the audio. In order to lift the microphone input, R6 was changed to 470K. The mini counter comes from Hendricks QRP and was chosen for it's low power consumption and small size . Some humming interference can be caused by the display multiplexer of the counter but a small filter takes care of that:<br />
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<a href="http://1.bp.blogspot.com/-BkrEwnc3cFg/UjQIkzW3EJI/AAAAAAAAAow/iosq72719iY/s1600/hum+filter+counter.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="207" src="https://1.bp.blogspot.com/-BkrEwnc3cFg/UjQIkzW3EJI/AAAAAAAAAow/iosq72719iY/s400/hum+filter+counter.PNG" width="400" /></a></div>
<br />
The cabinet was ordered from Qrp Project in Berlin <a href="http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Kuehlr168x110x54">http://www.qrp-shop.biz/epages/qrp-shop.sf/de_DE/?ObjectPath=/Shops/qrp-shop/Products/Kuehlr168x110x54</a> It fits the board like a glove . For smooth tuning a 1:10 ball drive is added. Because of the 180 degree tuning range of the polyvaricon, only a 1:5 reduction remains. Ball drive reductors:<br />
<a href="http://www.ebay.com/sch/Radio-Communication-/1500/i.html?_from=R40&_nkw=ball+drives">http://www.ebay.com/sch/Radio-Communication-/1500/i.html?_from=R40&_nkw=ball+drives</a><br />
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<a href="http://2.bp.blogspot.com/-sOW-nYcfQGc/UjQJM9JOSEI/AAAAAAAAAo4/lJhWWLSGPzE/s1600/iler+inside+vieuw.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="396" src="https://2.bp.blogspot.com/-sOW-nYcfQGc/UjQJM9JOSEI/AAAAAAAAAo4/lJhWWLSGPzE/s640/iler+inside+vieuw.PNG" width="640" /></a></div>
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<a href="http://4.bp.blogspot.com/-hIctTLyW-P4/UjQJezrVgSI/AAAAAAAAApA/SSTGunWPbKw/s1600/balldrive.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://4.bp.blogspot.com/-hIctTLyW-P4/UjQJezrVgSI/AAAAAAAAApA/SSTGunWPbKw/s640/balldrive.PNG" width="640" /></a></div>
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<a href="http://2.bp.blogspot.com/-KRHQJYyEowQ/UjQK4YrzazI/AAAAAAAAApM/_m81zarT2vE/s1600/pa+iler.PNG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://2.bp.blogspot.com/-KRHQJYyEowQ/UjQK4YrzazI/AAAAAAAAApM/_m81zarT2vE/s640/pa+iler.PNG" width="640" /></a></div>
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The BD135 driver heats up at long qso's . This heat can cause the standard vfo to drift ,especially in vertical use. Connect the transistor to the cabinet by means of a u-shape alluminium strip for better cooling.<br />
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The Iler kits represent a modern and compact, easy to build alternative, to the Bitx and Taurus.<br />
More info about this nice kit : <a href="http://ea3gcy.blogspot.nl/">http://ea3gcy.blogspot.nl/</a><br />
<br />
Update 25/11/2014<br />
Today i installed the Iler DDS generator. I expected some digital noise but surprisingly the audio stayed verry clean after a small mod. almost without any spurs or birdies. <br />
Tuning is verry smooth and accurate with the provided step levells.<br />
Next mod wil be a simple NE 555 tone generator to generate a carrier for swr readings.<br />
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<table cellpadding="0" cellspacing="0" class="tr-caption-container" style="float: left; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://4.bp.blogspot.com/-Sb_0LQYM-z4/WtMYkPHZYzI/AAAAAAAACto/-9CGoX-pqPEMXD__Y9dGDfi4Y7RVnFd1wCLcBGAs/s1600/20180415_111125.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" data-original-height="1250" data-original-width="1600" height="500" src="https://4.bp.blogspot.com/-Sb_0LQYM-z4/WtMYkPHZYzI/AAAAAAAACto/-9CGoX-pqPEMXD__Y9dGDfi4Y7RVnFd1wCLcBGAs/s640/20180415_111125.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">The final version with dds</td></tr>
</tbody></table>
<br />
<br />
<span style="color: blue;"><b>POPPING AUDIO MOD.</b></span> <br />
Despite of a reasonably good working lf AGC, verry strong signals can produce a loud popping sound due to a massive overload of the LM-386 input. 2 Bat-85 Skottky diodes in anti-parallel over the 10K-B volume potentiometer and a 10K resistor between C32 and the potentiometer cure most of the problem.<br />
The extra parts can be mounted directly on to the potentiometer.<br />
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<a href="http://3.bp.blogspot.com/-YlflswNoD90/VIhrk8HNjMI/AAAAAAAABGA/4GkOkCE3Haw/s1600/popping%2Baudio%2Bmod.GIF" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="412" src="https://3.bp.blogspot.com/-YlflswNoD90/VIhrk8HNjMI/AAAAAAAABGA/4GkOkCE3Haw/s1600/popping%2Baudio%2Bmod.GIF" width="640" /></a></div>
<span style="background-color: blue;"></span><span style="color: blue;"><b>DDS POWER MOD</b></span><br />
<span style="color: blue;"><span style="color: black;">The DDS adds some noise to the audio. A small 100uH choke and a capacitor to ground at the DDS power pin are the solution</span><b> </b></span><br />
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<a href="https://1.bp.blogspot.com/-L1obXp_Ht5I/V5TdKspIeqI/AAAAAAAABXY/3w-KbM639DktfV4Q16Ku9FQi94fNa98cwCLcB/s1600/dds%2Bpower%2Bmod.GIF" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="460" src="https://1.bp.blogspot.com/-L1obXp_Ht5I/V5TdKspIeqI/AAAAAAAABXY/3w-KbM639DktfV4Q16Ku9FQi94fNa98cwCLcB/s640/dds%2Bpower%2Bmod.GIF" width="640" /></a></div>
<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="https://3.bp.blogspot.com/-AAzc1Qs1CT4/WE2Rv7QMNFI/AAAAAAAABd8/HYdoGZcZsyYuNDHCwBGO52Lcr6K930BvACLcB/s1600/iler%2Bbasis%2B70%2BWatt.jpg" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="412" src="https://3.bp.blogspot.com/-AAzc1Qs1CT4/WE2Rv7QMNFI/AAAAAAAABd8/HYdoGZcZsyYuNDHCwBGO52Lcr6K930BvACLcB/s640/iler%2Bbasis%2B70%2BWatt.jpg" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Iler base station 20m. 70 Watt</td></tr>
</tbody></table>
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<div class="MsoNormal">
<span lang="EN-GB" style="mso-ansi-language: EN-GB;">A <span style="mso-spacerun: yes;"> </span>MAX7400 is an 8<sup>th</sup> order elliptical
filter giving a 100 Hz to aprox. 3000 Hz tuning rate. It <span style="mso-spacerun: yes;"> </span>means much more selectivity in many homebrew
receivers.</span></div>
<div class="MsoNormal">
<span lang="EN-GB" style="mso-ansi-language: EN-GB;">The output
can drive a LM386 . This filter is a must have for cw operators with</span><span lang="EN-GB" style="mso-ansi-language: EN-GB;"> si</span><span lang="EN-GB" style="mso-ansi-language: EN-GB;">mple ssb
receivers.</span></div>
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<a href="http://3.bp.blogspot.com/-qUije0F9FBs/VS4qvnkHt_I/AAAAAAAABNA/R9w_4jpaAow/s1600/stepup.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="626" src="https://3.bp.blogspot.com/-qUije0F9FBs/VS4qvnkHt_I/AAAAAAAABNA/R9w_4jpaAow/s1600/stepup.JPG" width="640" /></a></div>
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This is a 200 Watt PEP step up transformer for end fed full and half wave antennas without radials, designed as a 200 Watt PEP upgrade by PA0EJH for the originaly Par Electronics designed 25 Watt HF endfedz multiband end fed antenna.<br />
The original design has a 27/3 turn ratio ( 1: 81 ) on a small 43 material toroid, but the larger toroid has more wire so the nr of turns had to be reduced for max.efficiency on 10m. The coil now has a 16/2 ratio ( 1: 64 ) <span style="color: red;">For max. performance the 2 turns to ground must be twisted</span> . The 100-150pF capacitor gives a better match on 10m.and both windings start at the ground side of the coil .Don't try to stack toroids for more power for this will increase overall inductance . This makes it impossible to tune the high bands. The best results are obtained with a small toroid.....The 3 band antenna has a length of aprox. 10.1m. followed by a coil of about 34 uH ( 90 turns 1mm transformer wire on a 19mm pvc tube ) and a endpiece of about 1.85m , offering you a perfect vertical or horizontal antenna for fieldwork at 40 -20 and 10m. There is also a 5 band version with aprox. 20.35m wire followed by a 110 - 120uH coil ( about 260 turns 1 mm transformer wire on a 19mm pvc tube ) and a aprox. 2.39m. endpiece. Use a longer wire for testing for surrounding objects can interact .<br />
*** Start tuning the antenna by tuning the long wire at the high bands with the coil and the endpiece attached, for the coil interacts. Many people do this the wrong way ! Don't use an other type of toroid like the nr 2 or 6 mix for the AL value of these toroids is far to low and will result in heavy losses. ***<br />
This antenna works on 80 - 40 - 20 -15 and 10m.without radials and has a verry low swr combined with a low noise level. Keep in mind that every end fed / vertical needs some kind of counterpoise to push against and in this case that's the coax , so don't forget a line choke near to your transceiver. Cul = transformer wire.<br />
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<tr><td style="text-align: center;"><a href="http://4.bp.blogspot.com/-XhccfF_UOgA/UhvRXJwEFDI/AAAAAAAAAoM/tW_SObxgrO4/s1600/transformer+with+150+pF+and+3K3+to+ground.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="480" src="https://4.bp.blogspot.com/-XhccfF_UOgA/UhvRXJwEFDI/AAAAAAAAAoM/tW_SObxgrO4/s640/transformer+with+150+pF+and+3K3+to+ground.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">Tranformer with 150pF and 3K3 resistor to ground</td></tr>
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<a href="http://4.bp.blogspot.com/-cAuNGcMmaqU/T50FeB2qXKI/AAAAAAAAAdk/NpFqFFeDCsk/s1600/multiband+end+fed.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="374" src="https://4.bp.blogspot.com/-cAuNGcMmaqU/T50FeB2qXKI/AAAAAAAAAdk/NpFqFFeDCsk/s640/multiband+end+fed.jpg" width="640" /></a></div>
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Transformer on a smaller FT140-43 toroid for max. 100 Watt pep</div>
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<b><span style="color: blue;">Update 2014-03-21</span></b> <br />
I live in a apartment on the first floor so you can imagine my antenna problems....<br />
My balcony however is 10m. long ,so i mounted a horizontal endfed antenna without the coil, for 20-10m on the wooden windowframe . Because of the capacity of the wood and the paint overall length was reduced to aprox. 9m.. but provided a near 1:1 swr on 20 and 10m.<br />
First contact on 10m. was with 5B4AHL (5-9) on cyprus folowed by 9K2QA (5-9) in Kuwait and 4S7VG (5-8) in SRI Lanka despite of a huge pile-up. This antenna is going to st<span style="background-color: cyan;"><span style="background-color: cyan;"><span style="background-color: white;"></span></span></span>ay HI.<br />
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<b><span style="color: blue;">MONO BAND HIGH EFFI</span></b><span style="color: blue;"><b>CIENCY HALF WAVE ANTENNA</b></span><br />
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If a high efficiency antenna is needed here are the data. Use thin 50 Ohm Teflon coax wire for the capacitor ( one side open ) . 1 cm coax is aprox. 1 pF.<br />
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<a href="http://3.bp.blogspot.com/-SWerU8-YmEc/VUOJoCEFa8I/AAAAAAAABPE/HUMPRMtN9Z8/s1600/mono%2Bendfed.GIF" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="https://3.bp.blogspot.com/-SWerU8-YmEc/VUOJoCEFa8I/AAAAAAAABPE/HUMPRMtN9Z8/s1600/mono%2Bendfed.GIF" /></a></div>
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Tuning without the antenna : connect a 3300 Ohm resistor fom the coil end to the ground of the coax connector. cut the coax-capacitor carefully for lowest SWR . Connect the antenne and cut the antenna wire for best SWR .<br />
Calculate L and C for your own matching unit: <a href="http://www.daycounter.com/Calculators/L-Matching-Network-Calculator.phtml">http://www.daycounter.com/Calculators/L-Matching-Network-Calculator.phtml</a><br />
Reactance L and C : <a href="http://www.daycounter.com/Calculators/Reactance-Calculator.phtml">http://www.daycounter.com/Calculators/Reactance-Calculator.phtml</a><div class="blogger-post-footer">
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-46456988929711111162011-07-24T14:20:00.015+02:002014-11-23T10:27:37.987+01:00No ground antenna for backpackers, balconies or plastic car bodies<div class="separator" style="clear: both; text-align: center;">
<a href="http://1.bp.blogspot.com/-_CXNLfC7KRw/TiwN_1jBmMI/AAAAAAAAAZ8/teljFWoy_ZQ/s1600/no+ground+antenna.GIF" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-_CXNLfC7KRw/TiwN_1jBmMI/AAAAAAAAAZ8/teljFWoy_ZQ/s1600/no+ground+antenna.GIF" /></a></div>
A common problem with backpacker or balcony antennas is finding a good counterpoise. Also cars and caravans with a plasic body are a problem. Althow nothing beats a set of resonant radials, the shown solution offers a 1/4 wave stub that wil create an artificial counterpoise. The mobile antenna mount must be isolated from any metal by a epoxy or plastic sheet and a normal T-Connector is used at the antenna feedpoint. Be shure to shortcut the end of the stub. The length of the stub in meters equals 1/4 Lambda x 0.66 (this is the velocity factor of 50 Ohm RG-58 ) or can be calculated by deviding 50 by the frequency .So if you need a stub for 14 MHz the outcome is 3.57 m. but this length is not critical. The setup can be easily mounted on top of a rucksack. On a balcony the stub can be layd on the floor.<div class="blogger-post-footer">
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-27999609534309022272011-06-29T23:37:00.010+02:002016-09-23T10:28:01.650+02:00Z-Match 100 and mini Z-Match<div class="separator" style="clear: both; text-align: center;">
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<tr><td class="tr-caption" style="text-align: center;">FIRST TEST WITH A 4C65 TOROID, LATER A T200-2 WAS USED<br />
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<a href="http://1.bp.blogspot.com/--mP1tS7O_s4/VFkS6mVWgQI/AAAAAAAABCg/WtcUJPQ1Cyw/s1600/zmatch%2B100%2Bok%2B012.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="422" src="https://1.bp.blogspot.com/--mP1tS7O_s4/VFkS6mVWgQI/AAAAAAAABCg/WtcUJPQ1Cyw/s1600/zmatch%2B100%2Bok%2B012.jpg" width="640" /></a></div>
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FINAL VERSION WITH THE T200-6 TOROID </td></tr>
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This is a antennatuner with wide range tuning for antennas with a Z of + 50 Ohms on all the HF bands. The tuner is based on a G3WQW design. A T200-6 should give a better Q but the T200-2 was in stock and gave me sufficient tuning range.The final version has the T200-6 toroid and a metal cabinet to provide a better HF isolation. Being a high-pass type it contributes to less receiver noise. The capacitors are radio types and can be used up to 150 Watts. Using a metal cabinet needs a "floating"mount of the input capacitor. More info about the Z-match design can be found <a href="http://www.njqrp.org/mbrproj/zmatch_original.html">here</a><br />
Tuning capacitors :<a href="http://www.rfparts.com/capacitors/capacitors-antennaload.html">http://www.rfparts.com/capacitors/capacitors-antennaload.html</a> <br />
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<a href="http://2.bp.blogspot.com/-o3nm7iP3U6U/TguZlsQRqlI/AAAAAAAAAYk/0BQifD77KsU/s1600/mini+zmatch.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://2.bp.blogspot.com/-o3nm7iP3U6U/TguZlsQRqlI/AAAAAAAAAYk/0BQifD77KsU/s640/mini+zmatch.JPG" width="640" /></a></div>
The QRP 160-6 m. mini Z-Match with a T130-2 toroid in a matal cabinet. Polyvaricons are used for tuning within qrp limits. By switching a 270-500 pF capacitor over the left side of C2 (2x 500pF) the tuning range can be extended. It's possible to tune a doublet antenna on all HF bands. Together with the FT-817 it makes a great qrp combo.<br />
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<a href="http://1.bp.blogspot.com/-HXfsarz8cuQ/ThBX8RiStSI/AAAAAAAAAZU/fInzKBXV3aA/s1600/IMG_1224.JPG" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://1.bp.blogspot.com/-HXfsarz8cuQ/ThBX8RiStSI/AAAAAAAAAZU/fInzKBXV3aA/s640/IMG_1224.JPG" width="640" /></a></div>
The mircro Z-Match with 12x5x3 cm ultra portable for 80-6 m. In this tuner a nr. 6 material toroid was used. There is still some room left for a tuning indicator....<br />
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<a href="http://3.bp.blogspot.com/-_WbiAUJuuh0/VS4qC4n7FTI/AAAAAAAABM4/gyvPWvFQhKA/s1600/tuning%2Baid.GIF" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="380" src="https://3.bp.blogspot.com/-_WbiAUJuuh0/VS4qC4n7FTI/AAAAAAAABM4/gyvPWvFQhKA/s1600/tuning%2Baid.GIF" width="640" /></a>QRP tuning indicator . A perfect match is indicated by a bright shining LED , suitible for QRP only. Can be mounted in any QRP tuner at the antenna output. <br />
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<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-__h-Ry82ei8/Tg9Hnh8ti6I/AAAAAAAAAZA/_kq8Lx9oiJY/s1600/IMG_1152.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="374" src="https://3.bp.blogspot.com/-__h-Ry82ei8/Tg9Hnh8ti6I/AAAAAAAAAZA/_kq8Lx9oiJY/s640/IMG_1152.JPG" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"> THE TUNING AID IN MY MINI Z-MATCH<br />
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<a href="http://2.bp.blogspot.com/-9vovJWl9Jxg/UvY7e3WIN1I/AAAAAAAAA2U/dv-az5BR5H0/s1600/mini+zmatch+2.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="480" src="https://2.bp.blogspot.com/-9vovJWl9Jxg/UvY7e3WIN1I/AAAAAAAAA2U/dv-az5BR5H0/s1600/mini+zmatch+2.jpg" width="640" /></a></div>
Another mini Zmatch i made for the field.<br />
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<a href="http://4.bp.blogspot.com/-Se-W7qmviqs/ThBOkr85DoI/AAAAAAAAAZQ/7R4RNQ8Txik/s1600/817%252Bknirpstuner.jpg" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" height="582" src="https://4.bp.blogspot.com/-Se-W7qmviqs/ThBOkr85DoI/AAAAAAAAAZQ/7R4RNQ8Txik/s640/817%252Bknirpstuner.jpg" width="640" /></a></div>
VELCRO MOUNTED MICRO Z-MATCH </td></tr>
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-39784257532936124202011-06-29T14:57:00.006+02:002015-02-27T10:37:19.011+01:00Travel loop antenna type 40-10 and 80-10<div class="separator" style="clear: both; text-align: center;">
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<span lang="EN-GB" style="color: black;">Haunted as many others by radio interference and noise I started looking for a wideband portable antenna . Soon I became focused on a magnetic loop antenna. The only catch was the method of feeding by a Faraday loop , it made the project hand sensitive …. In the Rothammel Antennabook I found a complete different way of feeding made by capacitors .</span></div>
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<span lang="EN-GB" style="color: black;">This was a big improvement and made a perfect match possible between 6.5 and 30 MHz.</span></div>
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<span lang="EN-GB" style="color: black;">Both tuning capacitors come from old AM radios and because their sections are switched in series , they can be used up to 30 Watts without arcing. They interact so it’s wise to make some markings on the front for fast tuning.</span></div>
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<span lang="EN-GB" style="color: black;">The loop is made of RG-213 coax and rests on a cross made of 6 mm. fibreglass rods( kite shop )</span></div>
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<span lang="EN-GB" style="color: black;">Inside the tuner is a shortcut between the centre and the braid of the coax loop to form a solid ring . By simply adding a second loop with a 5 cm.spacing and a switch to put the loop's in parallel or in series, the antenna becomes a 80-10 m. portable low power loop for travelling. The travelloop was born HI. It has been my travel companion for many years with many qso’s even far over the Atlantic.</span><br />
<span lang="EN-GB" style="color: black;">Tuning capacitors : <a href="http://www.rfparts.com/capacitors/capacitors-antennaload.html">http://www.rfparts.com/capacitors/capacitors-antennaload.html</a></span><br />
<span lang="EN-GB" style="color: black;">GG8ODE added a smart tuning indicator , ideal for home made rigs without swr meter :</span><br />
<span lang="EN-GB" style="color: black;"><a href="https://rsars.files.wordpress.com/2013/01/qrp-loop-tuner-80-20m-g8ode-iss-1-32.pdf">https://rsars.files.wordpress.com/2013/01/qrp-loop-tuner-80-20m-g8ode-iss-1-32.pdf</a> </span></div>
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<tr><td class="tr-caption" style="text-align: center;">6.5-30 MHz TRAVEL LOOP</td></tr>
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<tr><td class="tr-caption" style="text-align: center;"> 6.5- 30MHz tuner</td></tr>
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<a href="http://1.bp.blogspot.com/-PCP_S7C0Yac/TgxaYUYt54I/AAAAAAAAAYw/4TlGi3RdT9k/s1600/travel-loop.BMP" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://1.bp.blogspot.com/-PCP_S7C0Yac/TgxaYUYt54I/AAAAAAAAAYw/4TlGi3RdT9k/s640/travel-loop.BMP" height="452" width="640" /></a></div>
<a href="http://3.bp.blogspot.com/-_ovnvzSaoKM/TgseQgVmwZI/AAAAAAAAAYA/yrNVaSJvqtA/s1600/IMG_0322+%2528Small%2529+%25282%2529.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://3.bp.blogspot.com/-_ovnvzSaoKM/TgseQgVmwZI/AAAAAAAAAYA/yrNVaSJvqtA/s640/IMG_0322+%2528Small%2529+%25282%2529.JPG" height="480" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">3.5- 30 MHz VERSION WITH BANDSWITCH</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">THE SWITCH SHOWN FROM BEHIND</td></tr>
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<span style="color: red;">CAUTION !</span> <br />
Magnetic loop antennas can produce a high voltage that may be harmfull to your health.<br />
Tune your antenna at low power and take a safe distance while operating . <br />
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-55552546365125948592011-06-01T22:20:00.010+02:002014-12-19T17:31:15.331+01:0020/11/10m.monoband end fed halfwave antenna<a href="http://1.bp.blogspot.com/-HeiJnnXJwUs/TenOz1T-SxI/AAAAAAAAAVQ/ZcJL157SYL4/s1600/QSL%2BPD7MAA%2B%2528Small%2529.png"><br />
</a><span lang="EN-GB">Working portable demands an easy setup of your antenna. The antenna also has to give enough punch at a low radiation angle without the need of radials.</span> <br />
<div class="MsoNormal">
<span lang="EN-GB">The vertical end fed half wave antenna is my choice for it’s easy to employ and it's a perfect DX antenna . This antenna is grounded thus giving les static noise to your receiver.<br />
</span></div>
<div class="MsoNormal">
<span lang="EN-GB">A 20m. version is about 10 m. long and has aprox. 3000 Ohms at the feedpoint. So we need a simple tuner to reduce this to 50 Ohm .</span></div>
<div class="MsoNormal" style="text-align: left;">
<span lang="EN-GB">Put 20 turns ( covers half of the toroid ) of 1 - 1.2 mm enamel wire on a T130-2 toroid with a tap at <span style="color: red;"><span style="font-weight: bold;">3</span></span> turns from the ground .The first picture shows the first test setup with a 2.5 turn tap. You also need about 25 cm of thin Teflon coax (RG 178 b/u) that will act after tuning as a high voltage capacitor of about 22 pF.<br />
</span></div>
<div class="MsoNormal">
<span lang="EN-GB">The pictures explain the simple construction. </span>The cabinet is a PVC type G302 made by Velleman. </div>
<div class="MsoNormal">
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<a href="http://2.bp.blogspot.com/-ib-vhDWGvfI/TgMWFrakZBI/AAAAAAAAAWU/g7hS5meJyyo/s1600/halfwave.gif" imageanchor="1" style="margin-left: 1em; margin-right: 1em;"><img border="0" src="http://2.bp.blogspot.com/-ib-vhDWGvfI/TgMWFrakZBI/AAAAAAAAAWU/g7hS5meJyyo/s400/halfwave.gif" height="387" width="400" /></a></div>
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<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-RyP27v5WGh8/TgML9E6ZwNI/AAAAAAAAAWE/rKOlwupx_F4/s1600/IMG_1213.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://3.bp.blogspot.com/-RyP27v5WGh8/TgML9E6ZwNI/AAAAAAAAAWE/rKOlwupx_F4/s640/IMG_1213.JPG" height="640" width="480" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"> TWISTED TAP FOR MORE STABILLETY</td></tr>
</tbody></table>
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<tr><td style="text-align: center;"><a href="http://1.bp.blogspot.com/-4Ee3ZePnqwc/TgMMDO2Ut9I/AAAAAAAAAWI/SlouOM6WjXA/s1600/IMG_1215.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://1.bp.blogspot.com/-4Ee3ZePnqwc/TgMMDO2Ut9I/AAAAAAAAAWI/SlouOM6WjXA/s640/IMG_1215.JPG" height="640" width="480" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;"> NOTE THE GROUNDSTRIP</td></tr>
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<table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="margin-left: auto; margin-right: auto; text-align: center;"><tbody>
<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-3isxBa-RBdI/TgMMHBjHEsI/AAAAAAAAAWM/3H80pyPkFew/s1600/IMG_1216.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://3.bp.blogspot.com/-3isxBa-RBdI/TgMMHBjHEsI/AAAAAAAAAWM/3H80pyPkFew/s640/IMG_1216.JPG" height="480" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">ADDING THE CAPACITOR/COAX </td></tr>
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<tr><td style="text-align: center;"><a href="http://3.bp.blogspot.com/-z0Vg9UHo3-I/TgMML2ebP7I/AAAAAAAAAWQ/AFEY6Dql-5A/s1600/IMG_1218.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" src="http://3.bp.blogspot.com/-z0Vg9UHo3-I/TgMML2ebP7I/AAAAAAAAAWQ/AFEY6Dql-5A/s640/IMG_1218.JPG" height="480" width="640" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">HOT GLUE FIXATION </td></tr>
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<br />
<span lang="EN-GB">Tuning : The trick to tune this transformer is to find the working frequency first by tuning the capacitor. Then we look for the the 50 Ohm point on the coil . Connect a 3300 Ohm resistor from the top of the coil to the ground of the antenna plug.</span></div>
<div class="MsoNormal">
<span lang="EN-GB">Adjust the length of the open coax line until you reach the lowest VSWR in the centre of the band with an analyser. The coax will be about 23 cm in total resulting in 22pF .<br />
</span></div>
<div class="MsoNormal">
<span lang="EN-GB">Now remove the resistor and connect the antenna wire of aprox. 10 m. PVC coated copper wire. Tune the antenna for best VSWR by reducing it's length carefully. My antenna is 9.9m. long and is mounted on a 12.5 m. <a href="http://www.dx-wire.de/">fishing pole</a>. A near 1:1 VSWR on 14.200 MHz can always be achieved ! Before tuning , fix the toroid with some hot glue and wait fore it to cool off. Beware of the high voltage at the antenna feedpoint , this can rise up to almost 500V at 100 Watts.</span><br />
<span lang="EN-GB"><br />
</span><br />
<span lang="EN-GB"><span style="color: blue;"><b>10/11m version</b></span> </span><br />
<span lang="EN-GB">For 10/11m band use 16 turns 1-1.2mm enamelled wire on a T130-6 toroid with a tap at 2-3turns.</span><br />
<span lang="EN-GB">A 15 cm piece of coax forms the capacitor. Antennawire length is aprox. 5.5m . </span></div>
<div class="MsoNormal">
<br />
<span lang="EN-GB">My first DX contact with a vertical half wave end fed antenna was with VK6MV in SSB using the long path, with a 5-5 report.</span><br />
<span lang="EN-GB"> I was also able to work Japan,Taiwan, Thailand, India, Indonesia, South-Africa, The Falklands ands. in SSB with good reports.</span> Every end fed / vertical needs some kind of counterpoise to push
against and in this case that's the coax , so don't forget a line choke
near to your transceiver. <a href="http://www.pa3eke.nl/joomla/"> </a></div>
<div class="MsoNormal">
<span lang="EN-GB">Good DX !</span></div>
<br />
<img alt="" border="0" src="http://1.bp.blogspot.com/-HeiJnnXJwUs/TenOz1T-SxI/AAAAAAAAAVQ/ZcJL157SYL4/s400/QSL%2BPD7MAA%2B%2528Small%2529.png" height="230" id="BLOGGER_PHOTO_ID_5614245800373537554" style="display: block; height: 230px; margin: 0px auto 10px; text-align: center; width: 400px;" width="400" /><br />
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<br><a href="http://easyhitcounters.com/" target="_top"><font color="#666666">Free Hit Counters</font></a></div>Unknownnoreply@blogger.comtag:blogger.com,1999:blog-22682844.post-30483577770458677192010-10-12T08:03:00.048+02:002018-06-26T13:52:01.003+02:00 Other projects<ol></ol>
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<tr><td style="text-align: center;"><a href="http://4.bp.blogspot.com/-TyCiIaEftJ0/Ts0JX4MfpcI/AAAAAAAAAbU/kFX1aXIoszU/s1600/15+mm+copper+tubing+loop.gif" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="640" src="https://4.bp.blogspot.com/-TyCiIaEftJ0/Ts0JX4MfpcI/AAAAAAAAAbU/kFX1aXIoszU/s640/15+mm+copper+tubing+loop.gif" width="486" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">15MM COPPER TUBING LOOP</td></tr>
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<b>Magnetic loopantenna calculator by KI6GD : <a href="http://www.iw5edi.com/wp-content/uploads/2013/12/loopcalc.exe_.zip">http://www.iw5edi.com/wp-content/uploads/2013/12/loopcalc.exe_.zip</a></b><br />
<b>The prog. doesn't have an icon, just klick in the white square above it's name .</b><br />
<br />
<b>DO YOU LIKE TO EXPERIMENT WITH ANTENNAS ? </b> <br />
Here's all you ever wanted to know about VSWR :<br />
<br />
<a href="http://www.amateurradio.org.za/VSWR%20John%20Fielding%20Final.pdf">http://www.amateurradio.org.za/VSWR%20John%20Fielding%20Final.pdf</a><br />
<br />
SOME OF MY OTHER PROJECTS.<br />
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<tr><td class="tr-caption" style="text-align: center;">First enlosure of the Iler . It turned out to be to big for fieldwork.</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">Taurus 20 qrp ssb</td></tr>
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<tr><td class="tr-caption" style="text-align: center;">TAURUS 20M SSB TRX WITH PA 8WATTS<br />
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<tr><td style="text-align: center;"><a href="http://2.bp.blogspot.com/-TCVDkxO7978/T0ooinCEnVI/AAAAAAAAAcU/IU2w4fxXLHM/s1600/pixie+line.JPG" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="640" src="https://2.bp.blogspot.com/-TCVDkxO7978/T0ooinCEnVI/AAAAAAAAAcU/IU2w4fxXLHM/s640/pixie+line.JPG" width="480" /></a></td></tr>
<tr><td class="tr-caption" style="text-align: center;">PIXIE 20M. CW QRP LINE WITH TUNER TOY TRX BUT FUN TO BUILD<br />
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BANDPASS FOR 20M. AT FIELDDAYS IT'S MANDATORY<br />
<a href="http://www.arrl.org/files/file/Technology/tis/info/pdf/8809017.pdf">http://www.arrl.org/files/file/Technology/tis/info/pdf/</a><br />
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Soldering a coax in to small pcb holes can be verry stessfull. Teflon coax is the best choise.<br />
Here is the solution:<br />
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Here is DK7IH's fine blog for real builders : <a href="https://radiotransmitter.wordpress.com/">https://radiotransmitter.wordpress.com/</a> </div>
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