Kenwood TS-570D Slow Scan Tv/ Facsimile, Satellite Operation, Specialized Communicating

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 full-color images. Instead of trying to describe your station, just showing it is much faster. To do this, you require a scan converter to translate your video images into audio signals that can be fed into your transceiver. Or, to begin more simply, you can use only your computer with readily available software to perform this task. A TV set and a video camera that you may already own will also be useful tools.

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 hunt-and- miss method of communicating via the ionosphere.

An example of a Mode K satellite that uses uplink and downlink HF frequencies is the Radio Sputnik 12 (RS-12). Launched in the early 1990s, this satellite is in a low Earth orbit and provides brief windows of opportunity for use as it passes quickly over your location. The satellite accepts SSB or CW signals on the 15 meter band and outputs them on 10 meters.

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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