User's Guide

VHF Transmitter Amplifi er Instruction Manual
IM21-VT3150AMP
General Information
2
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 dB
c
.
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%.