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1. INTRODUCTION
The AEA model VSB-70 is a Fast-Scan Television (FSTV) transceiver that
operates on the amateur 420 to 440 MHz band. The transmitter features two local
oscillator crystaJ-controlled channels a'rid an output of one watt PEP on sync
peaks. Receive operation can, transceive or use variable tuning.
In transmit, baseband NTSC video and audio·are converted to Vestigial
Sideband (VSB) video with the FM audio subcarrier in the 70 cm band. This is
the same format as used by broadcast television. Video cameras, Camcorders
and video cassette recorders with video and audio output jacks can be used to
generate the baseband video and audio for transmission. A separate front panel
microphone jack may also be used for audio input. Either color or black and white
video may be used. Television channel 3 or 4 may be used to monitor your broad-
cast signal.
If you live in an area where channel 3 is used by a commercial television sta-
tion, your VSB-70 must be configured for channel 4, and vice versa. If you pur-
chased the wrong configuration, you can change the local oscillator crystals and
retune the unit for the opposite configuration. See chapter 4, Channel Selection.
For receive, the 70 cm television signal is converted to either television chan-
nel 3 or 4. A standard color or black and white television is used for.reception.
The same television is used for monitoring your transmission.
The VSB-70 uses
a GaAsFET preamplifier which provides for a system noise figure of less than 1.5
dB. Either crystal-controlled
or VFO receive tuning may be selected •.
In addition to the video source and television set, a 13.6 volt regulated pow~r
supply and 70 cm antenna are necessary. AEA also offers the RLA-70 linear
amplifier with MPS-100 power supply and the 430-16 antenna to compiete your
A TV station.
To transmit, an amateur technician or higher class-license is required.
2
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