User's Manual

User's Guide
The VT-3A130 Transmitter is a synthesized multichannel AM transmitter designed to interface
with the MT-3 Repeater Systems, while still maintaining MT-2 system compatibility. Both MT-3
systems are characterized by dependable low maintenance performance under the most severe
environmental conditions. In addition, all units are burnt-in for 24 hours and are accompanied by
a complete test report.
The VT-3A130 Transmitter operates in the 118 - 137 MHz aviation band. The transmitter’s
frequency stability is controlled by an OST-3A138 AM Enhanced Synthesizer. The Synthesizer
module can be programmed for up to 16 channels. A channel programmer can preprogram the
first 15 channels; channel 16 can be programmed from the front panel and channel 1 can be
programmed by the four BCD switches located on the MT-3 AM Transmitter Main Board.
The VT-3A130 modular transmitter family is compatible with all Daniel’s subrack and base station
enclosures.
Transmitter Features
Compatibility MT-2 Series and MT-3 Series Radio Systems
Frequency Generation Synthesized (internal plug-in module)
Channel Selection
In 25 kHz increments selected by four BCD switches
Preset capability for 16 channels selectable through external control
Front Panel Control
One 3 position switch:
- NORM (repeat mode)
- OFF
- KEY TX PTT Activation:
- Active to ground with time-out timer
- Active to ground without time-out timer
- Microphone activated without time-out timer
- Front Panel switch (KEYED) without time-out timer, (NORM) with or
without time-out-timer.
Amplifier Enable Active to ground