Tuesday, April 24, 2018

Yaesu VX-3 double battery idea

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A 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 al...
Friday, August 25, 2017

QRP labs QCX 5 Watt cw trx kit

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Here is my new winter project:  http://qrp-labs.com/qcx.html    I couldn't resist buying this little 10 x 8 cm gem with a lot of fea...
Friday, January 20, 2017

EFHW antenna for 40-10m qrp

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I 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 s...
Saturday, November 12, 2016

DIY kits 70W SSB linear HF Power Amplifier For YAESU FT-817 KX3

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It's time for a new project.   eBay link to the seller                     My first impression : High quality PCB ( 100 x 50mm ) , al...
Sunday, February 14, 2016

Wall Loop 20m.

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A stealth solution for apartments . This max. size open loop antenna for 14 MHz with a totall circumference of 6m. ( 19.68 feet )  is des...
Wednesday, February 11, 2015

1:4 Voltage balun 3.5 - 30 MHz

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Flat SWR  from 3.5 to 30 MHz with 8 double turns on a 4C65 or FT140-61 toroid. SWR  1: 1.1 in the centre. The 4C65 was used  beca...
Friday, August 22, 2014

Single knob Travelloop 6.5 - 31 MHz

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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 gl...