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

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VHF Enhanced Transmitter Instruction Manual VT-3 132 - 174 MHz

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 set 5 min.).

Audio Input:

Balanced 600 ohm or unbalanced (optional).
Input level sensitivity, -25 dBm to 0 dBm.

Audio Response:

Pre-emphasis (6 dB per octave); +1.0 to -2.0 dB
from 300 Hz to 3 kHz;

Flat Audio Response:

+1 to -1 dB from 100 Hz to 3 kHz.

Audio Deviation:

Preset to ±3.0 kHz with a 1 kHz tone.

Subtone Audio Input 1:

0.5 Vpp at 200 Hz for ±500 Hz deviation
(internally adjustable).

Subtone Audio Input 1 Frequency range:

60 Hz to 300 Hz.

Subtone Audio Input 2:

0.5 Vpp at 100 Hz for ±500 Hz deviation
(internally adjustable).

Subtone Audio Input 2 Frequency range:

DC to 150 Hz.

Direct Modulation Input:

0.5 Vrms at 1 kHz or ±3 kHz deviation.

Direct Modulation Frequency range:

DC to 5 kHz.

Audio Distortion:

Less than 2.5% THD; 1 kHz tone at 1.5 kHz or
3 kHz deviation (-40°C to +60°C).

Hum and Noise:

Better than 55 dB
(test receiver band limited: 400 Hz to 30 kHz).