Amateur Radio Links

Here is a collection of amateur radio links.

Antennas

1. Frank N4SPP’s antenna projects https://www.nonstopsystems.com/radio/antennas_home.htm#top-of-page which includes End Fed Half Wave (EFHW) antenna construction with links - https://www.nonstopsystems.com/radio/frank_radio_antenna_multiband_end-fed.htm (added 22/11/20)
2. L.B. Cebik W4RNL (SK) documents http://on5au.be/Cebik%20documents.html
3. Half-Wave Flowerpot Antenna VK2ZOI https://vk2zoi.com/articles/half-wave-flower-pot/
4. Steve G3TXQ - Coax Common Mode Chokes http://www.karinya.net/g3txq/chokes/

Electronics

Calculators

1. Filter design, Skin depth, Smith Charts etc - https://leleivre.com/rftools.html (added 14/4/20)

Class D/E Amplifiers

1. Class E amplifier design and construction - http://www.classeradio.com/ (added 14/4/20)
2. AMfone Class E forum - http://amfone.net/Amforum/index.php?board=76.0 (added 14/4/20)
3. VK3HN’s website (links to the sites above and more) - https://vk3hn.wordpress.com/am/
4. NA5N’s website https://hyse.org/pdf/www.aoc.nrao.edu/~pharden/hobby/Hobby.shtml

Transceivers

QRP SDR

1. Transform QCX into an SDR SSB transceiver https://github.com/threeme3/QCX-SSB
2. Micro software defined transceiver (uSDX) group https://groups.io/g/ucx/topics

General

Homebrew

1. Peter B Marks VK2TPM marxy’s musing on technology - http://blog.marxy.org/
2. Owen Duffy VK2OMD - https://owenduffy.net
3. Peter Parker VK3YE - http://vk3ye.com/
4. Charlie Morris ZL2CTM - http://zl2ctm.blogspot.com/
5. EDN Create radio receiver circuits with the LM386 audio amplifier - https://www.edn.com/create-radio-receiver-circuits-with-the-lm386-audio-amplifier/
6. Doug Hunter VK4ADC https://www.vk4adc.com/web/index.php
7. Razvan M0HZH 600W HF amplifier https://qrpblog.com/a600-hf-6m-600w-ldmos-amplifier/
8. Rob VK4HAT https://robs-blog.net/ (includes copy of LTSpice for RADIO Aateurs and Crystal Sets to Sideband)
9. Chavdar Levkov LZ1AQ http://www.lz1aq.signacor.com/ - active antennas, TRX-SDR switches, SDR

Inductors

1. Toroid calculator http://toroids.info/T50-2.php