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Building HF transmitter filters using air-cored coils, wound on a pencil. This is surprisingly effective!
to amateur coil electronics filter hf inductor lpf radio transmitter ... on 14 March 2015
to electronics filter radio ... on 06 August 2012
An easiest (than FFT) way of doing tone recognition.
to algorithms audio detect filter software tone ... on 03 December 2011
GQRP Club - Low Power Amateur Radio
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
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tasty by Adam Sampson.