KC9RG

Amateur
Radio

HF QRP operation —
Low-power but still long-distance communication on the HF bands, using CW (Morse Code)

SW20+ 20m QRP CW amateur radio transceiver. SMK 40m QRP CW amateur radio transceiver.  Circuit board holding many SMT (surface-mount technology) components. NorCal QRP club Morse code paddles.
Surface-mount technology (SMT) construction — the NC2030 QRP HF transceiver
Morse Code
Build a QRP RF 50Ω Load and Power Meter
Rhombic antennas — Classic designs for UHF & microwave
Small HF antennas — Shortened doublet designs for 10.1 and 14 MHz
J-pole antennas, also known as
End-fed half-wave Zepps
Balanced line impedance and radiated power
Modifications for the Icom IC2-SAT and IC-229H 144-148 MHz FM transceivers —
Many years ago, I posted a few articles to USENET on how to modify the IC2-SAT and IC-229H for wide-band receive. And no, I don't know any more about the topic now than I did back then! But here is what little I do have on mods for these two Icom transceivers:
Modifications for the Icom IC-3220 VHF/UHF FM transceiver
PG1N's collection of QRP transceiver, receiver, and transmitter projects for 160m through 13cm.
QST archive 1915-present!
The American Radio Relay League has made an archive of most articles from QST magazine available to members! http://www.arrl.org/members-only/qqnsearch.html
World Radio magazine went from print to on-line only as it was absorbed by CQ magazine in 2009, back issues of World Radio are available on line.
Service manual archives:
Repeater directory —
http://www.artscipub.com/repeaters/
Grid Square Maps —
http://www.vhfdx.net/callbook/gmap.php
1960s ARRL videos — Video 1 and Video 2

Construction
and
Repair

Repairing a Tektronix 2445A oscilloscope


How to build your own oscilloscope probes
    Tektronix 2445A oscilloscope.
How to fabricate circuit boards:
General construction / modification / repair references, plus parts vendors
Other technical topics — construction and repair
Radio Antenna Engineering —
Edmund Laport's textbook is now available for free in electronic form.
Surface-mount technology (SMT) size standards

Propagation
and
Frequencies

The Radio Spectrum for Beginners —
Radio Frequencies —
Propagation —
Shortwave (HF) broadcast frequency assignments —
http://www.hfcc.org/
World Radio-Television Handbook — Latest updates of the authoritative shortwave broadcast schedules: http://www.wrth.com/updates_national.html
AM (MW) broadcast frequency assignments —
US & international frequency assignments —
http://www.ntia.doc.gov/osmhome/alloctbl/allockhz.html
International broadcast schedules —
http://www.eibi.de.vu/
FCC database of US frequencies —
Australia license database —
http://web.acma.gov.au/pls/radcom/assignment_range.range_search
New Zealand license database —
http://spectrumonline.med.govt.nz/licence-search.html
Scanner frequencies by state and city —
Railroads —

Internet
Radio

Internet radio —
OK, it isn't really "radio" but instead it's audio moved over the Internet.
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