Codan Radio Communications VT-3-150-SN User Manual

Transmitter Main Board Instruction Manual

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The  MT-3  Transmitter  Main  Board  integrates  the  MT-3  Front  Panel  Board,  MT-3  Audio
Processor, Synthesizer or Crystal Controlled Oscillator module, and Amplifier module together to
comprise a MT-3 series transmitter (see section 5.1: MT-3 Transmitter Block Diagram). The Front
Panel Board and the Audio Processor are soldered directly to the Transmitter Main Board while the
Amplifier and the Synthesizer or Crystal Controlled Oscillator module are frequency band sensitive,
plug-in modules. Circuitry and jumpers on the Transmitter Main Board control the operation of the
modules as well as the overall operation of the MT-3 transmitter. Power and signal connections are
made through the 48 pin type 'F' connector on the rear of the Transmitter Main Board where they
are  then  routed  to  the  other  MT-3  modules.    The  front  and  rear  panels  are  attached  to  the
Transmitter  Main  Board  and  together  with  the  extruded  aluminum  shell,  form  the  transmitter
enclosure.

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Type:

MT-3  Series Transmitter

Compatibility:

MT-3 Series Amplifier, OC-3 Crystal Controlled Oscillator
module, OS-3 and OS-3H Frequency Synthesizer modules.

Modulation:

11K0F3E or 16K0F3E (Frequency Modulation).

Operating Temperature Range:

-30˚C to +60˚C, optional -40˚C to +60˚C temperature test.

Operating Humidity:

95% RH (non-condensing) at +25°C.

Operating Voltage:

+9.5 Vdc Regulated.  +13.8 Vdc Nominal (11 - 16 Vdc).

Front Panel Controls:

NORM (repeat mode), OFF, and KEY TX (Tx on).

PTT Activation:

• Active to ground with or without time-out-timer;
• Microphone activated with or without time-out-timer;
• Front Panel switch:

KEY TX - without time-out-timer;

• NORM - with or without time-out-timer.
• Isolated (optional relay) with or without time-out-timer.

PTT Time-Out-Timer:

Selectable from 1 sec. to 8 hrs. (Factory Default: 5 min.).