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 transceiver SMK 40m QRP CW transceiver NorCal QRP club paddles
Morse Code
Small HF antennas — Shortened doublet designs for 10.1 and 14 MHz
J-pole antennas, also known as
End-fed half-wave Zepps
Modifications for the IC2-SAT and IC-229H 144-148 MHz FM transceivers —
Way back in the early 1990s, I posted a couple of articles to USENET on modifying these radios for wide-band receive. And no, I don't know any more about the topic now than I did back then!
  • IC2-SAT modification (July 1990). This is "part 2" but I can't find "part 1" through Google... Part 1 was where I measured the sensitivity across the newly expanded receive range.
  • IC-229 modification (Jan 1992).
Modifications for the IC-3220 VHF/UHF FM transceiver
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
Service manual archives:
Repeater directory —
http://www.artscipub.com/repeaters/
Grid Square Maps —
http://www.vhfdx.net/callbook/gmap.php

Construction
and
Repair
Repairing a Tektronix 2445A oscilloscope


How to build your own oscilloscope probes 		    Tektronix 2445A
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: http://snulbug.mtview.ca.us/books/RadioAntennaEngineering/
Surface-mount technology (SMT) size standards: http://en.wikipedia.org/wiki/Surface-mount_technology

Propagation
and
Frequencies
The Radio Spectrum for Beginners —
What are the various radio frequencies used for?
Radio Frequencies —
Ham bands and various utility frequencies
Propagation —
How the signals get from here to there, and live reports of propagation 		Aurora
Shortwave (HF) broadcast frequency assignments —
http://www.hfcc.org/
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 —
All except amateur and broadcast: http://www.fcc.gov/oet/info/database/
Amateur and broadcast: http://wireless.fcc.gov/uls/index.htm?job=home
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 —
— http://www.cityfreq.com/
— http://www.radioreference.com/
Railroads —
— http://www.on-track-on-line.com/scanner-radio.shtml
— http://www.on-track-on-line.com/amtrak-freqs.shtml

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