validation number

160m Shielded loop antenna - the 160m shield loop antenna based on W1FB articles in a number of ARRL publications

Transmitting Antennas For HF Broadcasting - This paper discusses a number of common used HF transmitting antenna systems and corresponding reference antenna codes. The latter was developed in close consultation with regional coordination groups ABU-HFC, HFCC-ABSU.

IOTA Groups and Reference Numbers - Short Format List of IOTA Groups and Reference Numbers

Yahoo! Groups : enigma2000 - enigma2000 · Number Station Monitors

Spy Numbers mailing list - Join this shortwave spy numbers stations mailing list

The Conet Project - Recordings of shortwave numbers stations

Spy Numbers sound files - Hundred of spy number stations recordings in mp3 file format

Really Low Frequency Operating - The world below 500 kHz (The wavelength is 1500 meters or just about a mile) has a number of interesting listening and communications opportunities with possibly more to come.

Numbers Stations by dxing.com - Article on number stations

Short Wave Espionage - Here you can access the book "Secret Signals, The Euronumbers Mystery" which was written in 1991 and is now out of print. Lot's of information on spionage and numbers stations

Salon People Counting spies - Salon.com's Article on Numbers Stations

Who operates those weird numbers stations on shortwave radio - Article on number stations

Shortwave Spy Numbers Stations - Shortwave spy numbers stations types, schedule of transmissions

Spy Number Stations - So you want to listen to the spies?

Number Stations at the end of the century - What does the future hold for 'Number Stations'?

The numbers game - Radio, an invaluable tool in intelligence

The mystery of the numbers stations - In response to a question about Numbers Stations, their origin and purpose, the following information should be of interest.

Spy Numbers Stations - N2UHC's Radio Stuff - Spy numbers stations are stations on HF that transmit messages consisting of groups of numbers. Sometimes letter groups are sent instead

Covert Comms Archive - Covert Comms was a monthly column wrote for the ACE newsletter from 1997 to 2002. The column was devoted to numbers stations, unidentified signals, intelligence information, and other related information

Introduction to number stations - long article on number stations history

Introduction to Spy Numbers Transmissions - Introduction to Spy Numbers Transmissions

Total Recorder - Captures any audio from the Internet, records audio from CD, microphone, line-in, converts any sound formats to WAVE and MP3. Total Recorder records streaming audio, Mic input, Line-in input as well as CDs and DVDs, allows users to schedule any number of future recordings

YG-PSK - Simple PSK31 and RTTY program based on the AE4JY PSK engine. Logging inlcudes 10-10 and VP number. Exports to ADIF and CSV.

Satbuster - SATBUSTER for Windows is especially designed for satellite visual observers and trackers. Its users, mainly amateur astronomers and radio amateurs, appreciate both the accuracy and the simple to use graphical interface.The software is aimed to hobbysts. However a growing number of plain folks are starting to use this tool to recognize and look at the International Space Station and the Space Shuttle during its missions too

Satpro - SATPRO is an earth satellite tracking software package for the IBM-PC and compatible class of microcomputers running MS-DOS. The forte' of SATPRO over other software packages is the accuracy of ephemerides produced and the number of simultaneous propagations that can be accomplished