Reference
AM windows
The
Considerate Operator's Frequency Guide
(PDF)
Ethics and Procedure for Radio Amateur
(PDF)
Call sign prefixes:
International by prefix
International by country
United States (FCC lookup)
Heathkit manuals and schematics:
http://tubularelectronics.com/
http://www.vintage-radio.info/heathkit/index.htm
http://www.d8apro.com/
Manuals for other equipment:
http://www.vintagemanuals.com/
http://bama.edebris.com/manuals/
73 magazine old issues online:
http://www.qsl.net/kb9mwr/files/ham/73.html
Transmitting tube information:
http://blog.aa6e.net/2017/02/whatever-became-of-eimac.html
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73,
Janis
AB2RA