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ZC1 HF WW2 Radio edit / delete
New Zealand's WW2 forces radio, including early FM experiments.
to electronics radio retrotech ... on 07 May 2011
Neat two-control ATU design. Making a better variable inductor (than I've currently got) would be the challenge -- note the wiper-on-toroid and variometer designs on this page... and also the air-cored coils at the bottom.
to antenna atu electronics ham radio ... on 06 May 2011
... and yet another SDR receiver. This one looks quite neat, but it doesn't have a preselector built in -- which means it can receive VHF by using harmonics, but you really would need to build some filters to make it useful.
to electronics hf radio sdr ... on 27 April 2011
A prebuilt Softrock-like HF SDR. Looks like it's mostly SMT.
to electronics hf radio sdr ... on 18 April 2011
GM3WOJ contents page edit / delete
Interesting bits on building amplifiers, and how to properly maintain crank-up antenna towers (it's remarkably complicated).
to amateur amp electronics hf mechanica radio retrotech rf ... on 11 April 2011
Bertie Genade's homepage edit / delete
Assorted electronics projects, including another VCR tuner-based spectrum analyser.
to electronics rf test-equipment ... on 02 April 2011
GQRP Club - Low Power Amateur Radio edit / delete
The GQRP guide to low-pass filter design. I need to order some bigger toroids.
to electronics filter ham lpf radio ... on 02 April 2011
Experimental AMPS Micro Base Station edit / delete
One of those mind-boggling projects. I assume it'd be relatively easy to implement on an SDR rig given the information he's managed to reverse-engineer...
to amps electronics radio telephone ... on 02 April 2011
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tasty by Adam Sampson.