...the best site on the internet for modifications and improvement of HAM rigs, HAM modems, etc.
Here you will find modifications of many types of HAM radios, microphones, power supplies, modems etc. You can find how to modify a radio to receive and transmit out of range, you can find how to modify a radio to use high speed packet modems, and how to modify the radio/modem to get better performance.
Right now the database contains 3100 articles...
http://www.mods.dk/