7 SPECIALIZED COMMUNICATING
SLOW SCAN TV/ FACSIMILE
SSTV is now increasing in popularity as a result of the capability of computers. Using this technique, you can transmit and receive still monochrome or
SSTV FREQUENCIES
IARU Region 1 | U.S.A./Canada | |
(Europe/Africa) | ||
Frequency (kHz) | ||
Frequency (kHz) | ||
| ||
3730~3740 | 3845 | |
7035~7045 | 7171 | |
14225~14235 | 14230 | |
21335~21345 | 21340 | |
28675~28685 | 28680 | |
|
|
The high resolution that is possible using facsimile (fax) can allow you to exchange more detailed graphics than SSTV allows. Due to the longer transmission times required for fax, it’s best to use this mode when band conditions are stable with strong signals.
Popular fax frequencies include the following:
•7245, 14245, 21345 (Intern. Net), 28945 kHz
Operation on SSTV or fax mainly involves learning the functionality of your computer application or accessory hardware that supports these modes. Consult the documentation that comes with your software or accessory equipment.
Note: When operating either SSTV or fax, use a fast AGC setting and switch OFF your Speech Processor for best results.
SATELLITE OPERATION
Though not as common as VHF/UHF satellite operation, HF satellite operation is possible depending on which satellites are currently in orbit around the Earth. When HF propagation is poor, satellite operation can provide an incentive to get back on the air. Since this communications mode is so reliable, you may discover you actually prefer satellite operation over the
An example of a Mode K satellite that uses uplink and downlink HF frequencies is the Radio Sputnik 12
This transceiver can also be used with Mode A satellites, if you have an SSB/CW VHF transceiver. Mode A satellites use a VHF uplink and an HF downlink.
If you’re interested in pursuing satellite operation, contact AMSAT (Radio Amateur Satellite Corporation) directly or via their internet Home page. This group of satellite operators, located all over the world, support the construction and operation of satellites. AMSAT can provide you with the latest information regarding Mode K and Mode A satellites that are currently in orbit.
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