PD7MAA HOMEPAGE

This 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 John

Friday, December 21, 2012

Adjustable bandwidth

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A   MAX7400 is an 8 th order elliptical filter giving a 100 Hz to aprox. 3000 Hz tuning rate. It   means much more selectivity in many ...
Thursday, April 19, 2012

Multiband end fed antennas 3.5 - 30mHz

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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 u...
Sunday, July 24, 2011

No ground antenna for backpackers, balconies or plastic car bodies

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A common problem with backpacker or balcony antennas is finding a good counterpoise. Also cars and caravans with a plasic body are a probl...
Wednesday, June 29, 2011

Z-Match 100 and mini Z-Match

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FIRST TEST WITH A  4C65 TOROID, LATER A T200-2 WAS USED  FINAL VERSION WITH THE T200-6 TOROID This is a antennatuner with wide r...

Travel loop antenna type 40-10 and 80-10

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Haunted  as many  others by radio interference and  noise I started looking for a wideband portable antenna . Soon I became focused on a ...
Wednesday, June 01, 2011

20/11/10m.monoband end fed halfwave antenna

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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...
Tuesday, October 12, 2010

Other projects

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15MM COPPER TUBING LOOP Magnetic loopantenna calculator by KI6GD :   http://www.iw5edi.com/wp-content/uploads/2013/12/loop...
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