Amateur Radio	HF QRP operation — Low-power but still long-distance communication on the HF bands, using CW (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 Service manual archives: — http://bama.sbc.edu/ — http://bama.edebris.com/manuals/ 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     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 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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