telephone number

Echo Horn Antenna at Nasa Images - The Horn reflector antenna at Bell Telephone Laboratories

Gloucestershire Repeater Group - operates & maintains a number of Amateur Radio Repeaters in & around the County of Gloucestershire

Amateur Radio Licenses World Map - This amateur radio world map resizes the countries based on the number of licensed operators

K-Y Filter Company - Modem Telephone Super Filters For HF and AM Radio Interference.

Vintage QSL Collection - This website was originally inspired by the discovery of a number of QSL (radio reception report) cards dating from the 1920s and is intended to make images of the cards available to as many people as possible.

What the numbers mean in propagation - What the Numbers Mean, and Propagation Predictions--a brief introduction to propagation and the major factors affecting it.

The FT-1000 slow display problem - A number of users have reported that their display takes 15 seconds or more to fully come on

CAT cable schematic for FT 817 857 897 - To connect up your FT-817/857/897 to a PC you have a number of options. For the serial connection you can go ahead and obtain a CT-62 from YAESU. Alternatively you can make up your box with a level converter and cable using schematic in this page

HFUnderground - HFUnderground.com is dedicated to documenting longwave, mediumwave, and shortwave stations, including broadcasters, utility/military stations, pirate radio and spy numbers stations.

Numbers & Oddities - Numbers stations and other odd radio stations, espionage, jamming, cryptography, code messages, sigint

E10 Spy Numbers - This page list schedules for the E10 Spy Number shortwave radio station, commonly believed to be run by mossad.

QLF Filter - Microprocessor based interface designed receives a signal from a Morse key, processes it, and re-transmits it to the radio. A microprocessor in the circuit is pre-programmed with a proprietary algorithm which makes a number of measurements and adjustments to the less percise human generated code.

Fix the Astron Power Supply Amp Meter - How fix Astron 70 model number VS-70M amp meter not working