VHF Transmitter Ampli
fi
er Instruction Manual
IM21-VT3150AMP
General Information
2
Performance Speci
fi
cations
Type: VHF
Transmitter
Ampli
fi
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 con
fi
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.
Ampli
fi
er Standby Current:
< 0.5 mA.
Ampli
fi
er Enable:
Active to ground.
Ampli
fi
er Enable Response:
typically overdamped, rising to within 90% of full power within 5 msec;
maximum (underdamped) overshoot of 30%.
