Codan Radio Communications VT-4D150 User Manual

VHF Transmitter Amplifi er Instruction Manual
IM21-VT3150AMP

General Information

Performance Specifi cations

Type: VHF 

Transmitter 

Amplifi er module for VT-3/150 , VT-4R and VT-4B series 

transmitters.

Compatibility: 

MT-3 series FM Transmitter Main Board or
MT-4 P25 Digital Transmitter Main Board.

Frequency Range: 

132-150 MHz or 150-174 MHz.

RF Power Output: 

adjustable 2.0 to 8.0 Watts

RF power Input: 

nominal level adjustable from 0 dBm to +5 dBm, held within 
+/- 2 dB of nominal.

Output Impedance and VSWR: 

50 Ω, Type N connector; 3:1 max. VSWR.

Input /Output Isolation: 

> 60 dB

Duty Cycle: 

100%: Continuous operation from -40˚ C to +60˚C.

Harmonic Emissions: 

< -90 dBc.

Transmitter Mismatch Protection:  20:1 VSWR at all phase angles.

Transmitter Alarm: 

Forward power sense and reverse VSWR;   

 

 

 

- open collector output (separate or ‘OR’ed confi guration);
- linear output (separate lines only).

Operating Temperature Range: 

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

Operating Humidity: 

95% RH (non-condensing) at +25˚ C.

Operating Voltage: 

+13.8 Vdc Nominal (range +11 to +16 Vdc),   

 

 

 

+9.5 Vdc Regulated.

Amplifi er Standby Current: 

< 0.5 mA.

Amplifi er Enable: 

Active to ground.

Amplifi er Enable Response: 

typically overdamped, rising to within 90% of full power within 5 msec; 
maximum (underdamped) overshoot of 30%.