Specifications

9.1.2 Slow Scan Television
Amateur Slow Scan Television (SSTV) originated in 1953 and is
presently found primarily in the 20 meter amateur band. Over the
years SSTV has evolved a great deal and many different formats now
exist for both black & white as well as color image transmission.
SSTV uses a Frequency Modulation scheme similar to FM facsimile where
the video information is usually transmitted by an audio tone between
1,500 Hz and 2,300 Hz. In SSTV however additional synchronizing
information is often necessary and is typically sent with tones
between 1,100 and 1,500 Hz. For this reason SSTV requires a
different modem than is used in FM Facsimile. Modem 8, the analog
modem may also be used for SSTV with your computer program.
9.2 Finding FAX Frequencies
The following is a list of HF FM facsimile frequencies that seem to
broadcast on a regular schedule. A few of these stations transmit
24-hours/day. We suggest you try the weather FAX frequencies listed
below while you are becoming familiar with facsimile operation.
After displaying a few images, and you are accustomed to the sound of
facsimile you will be able to tune the bands in search of other
frequencies where perhaps different kinds of pictures may be found.
Weather: USB 3,357.0 kHz 4,268.0 kHz 4,975.0 kHz 6,946.0 kHz
10,865.0 kHz 12,125.0 kHz 20,015.0 kHz
Photographs: LSB 10,680.7 kHz 17,673.9 kHz 18,434.9 kHz
The following HF facsimile frequencies were obtained from Popular
Communications Magazine:
USB
4,271.0 kHz 9,890.0 kHz 13,510.0 kHz Halifax, Canada
8,502.0 kHz 12,750.0 kHz Boston, Mass
9,389.5 kHz 11,035.0 kHz Brentwood, NY
4,793.5 kHz 10,185.0 kHz 12,201.0 kHz 14,671.5 kHz Washington, DC
9,157.5 kHz 17,447.5 kHz Mobile, Al
8,080.0 kHz 10,854.0 kHz 16,410.0 kHz Norfolk, VA
4,802.5 kHz 9,440.0 kHz 13,862.5 kHz Hawaii
7,770.0 kHz 11,090.0 kHz 13,627.5 kHz Hawaii
8,459.0 kHz Alaska
4,346.0 kHz 8,682.0 kHz 12,730.0 kHz 17,151.2 kHz San Francisco
8,646.0 kHz 17,410.5 kHz San Diego
VHF and Microwave APT Facsimile Satellite Frequencies
1691.0 MHz GOES Geosynchronous Weather Satellite (USA)
1694.5 MHz METEOSAT Geosynchronous Weather Satellite (ESA)
136.0-138.0 MHz Orbiting WEFAX APT Weather Satellites
Table 1: Facsimile Frequencies
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