© Copyright 1995-2003, Clay Irving N2VKG All Rights Reserved -- Version 4.1
Mon Oct 13 17:39:49 EDT 2003
information about scanning / digital scanning
- Digital HF
Dave Corio's collection of shortwave utility stations. Varied modes such as RTTY, TDM, FAX, and others.
- Digital Mode Samples
WAV file samples of digital modes to help you identify digitals modes you may hear while scanning.
- Digital Scanner News, Rumors, and Links
Harry Marnell's latest digital scanner news and reports.
- Digital Sounds
Examples of Digital signals are provided by WUN to help you identify the Utility signals you hear on shortwave. For more information on digital signals on HF, please read the Digital Signals FAQ.
- DTMF Decoder for DOS
ConCept Technology of Navarre useds the parallel port to bring in the data coming out of a M8870 decoder. The program dates/times it and saves to disk. Even has a very well drawn schematic of the decoder in the GIF format.
- How to modify your scanner with a discriminator output
Monitoring digital modes using FSK (e.g. POCSAG, FLEX and ERMES) gives the best result if you use the unfiltered audio from your scanner. You can find that signal at the discriminator of your scanner. A discriminator is the 'heart' of an FM-receiver. After the discriminator, audio filters and amplifiers follow that may heavily distort a digital signal. If you want to read along with paging systems seriously, a discriminator output is absolutely prerogative. Usually, scanners are not fitted with a discriminator output as a standard. You need to 'operate' on your scanner to make the discriminator signal available to the outside world. On this site, you can find pictures and descriptions of scanners that were modified with a discriminator output.
- Sounds of the Modern Commercial and Military Digital Station
Digital audio samples of various modem modulation types. This includes old familiars such as RTTY and some of the newer standards like that of the various NATO STANAG waveforms and MULTI/39-TONE modems. Also included are the sounds from Aeronautical Stations such as SELCAL.
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