A System for Broadcasting and listening to the Radio and Viewing slow Scan
TV Pictures. Using an ordinary AM/FM Receiver and a Slow Scan Video
Converter (SSTV)
Why not FSTV or Regular TV Pictures on the AM/FM Band?
Well full motion Band Width is 6MC Wide per Channel.
A very raw and not to Scale Example would be; if I Extended My arms
outward from My left to my right side then from My left hand finger tips
to My right hand finger tips would be My TV Bandwidth (FSTV) fast Scan
TV.
Now lets say on one arm only. From My elbow to My finger tips on the same
arm is the Bandwidth for FM, and on that same arm from My wrist to My
finger tips would be the AM Bandwidth, and now where My hand ends and my
finger tips begin from that point to My finger tips would be the
Bandwidth for (SSTV) Slow Scan TV.
As you can see full motion TV (NBTV is another Story 431730 per 1982 Brown
483/22), is too wide and would not fit into the AM 10 khz or the FM 200
khz Bandwidth per Channel
Further more even Full Motion TV can make use of SSTV; such as the WYMAN
AM439 ATV Transmitter in combination with TASCO TSC-70 Slow Scan Color TV
Converter. XM and SIRIUS Satellite Radio's CNN and FOX News Channel are
Audio only from the Cable Stations to the Satellite Radio Services. For
Example CNN could send the SSTV Signal through its SAP to XM and XM then
send the SSTV Signal through its RDS Channel.
My particular Transmitter is an AM Stereo setup with Slow Scan Video, for
Example; My AM Audio Carrier is 700 khz with a Bandwidth of 10 khz (695
khz to 705 khz) and My AM Video Carrier is at 692 khz with a Bandwidth of
4 khz (690 khz to 694 khz). A total of 15 khz wide allowable by the FCC
for standard AM broadcast in the United States.
The Slow Scan Video can be an AM Picture using Robot 36 Mode of FM Picture
in the AM Band using the fast FM Mode of the VC-H1 and a Transmitter like
the AM 88 North Country Radio that can broadcast an AM/FM Mode on the AM
Band
In addition, SSTV Pictures can be had on FM, using the RDS at 57 khz or
the SCA at the 67 khz above the main FM carrier.
Now because of Modulation differences (if desired) and Frequency
difference (-8 khz) there is no interference between the Audio and Video
on the AM Service.
A Diplexer and an Antenna Tuner enables both Signals to be sent out from
the same Antenna.