P25 Digital VHF Transmitter Instruction Manual
IM21-001
General Information
2
VT-4D150 Transmitter Family Models
There are four distinct models in the VT-4D150 Transmitter family each with different bands of
operation and power outputs. The four models are as follows:
• VT-4D140-2
136-150 MHz band, 0.5-2.0 Watt
• VT-4D140-8
136-150 MHz band, 2.0-8.0 Watt
• VT-4D160-2
150-174 MHz band, 0.5-2.0 Watt
• VT-4D160-8
150-174 MHz band, 2.0-8.0 Watt
The transmitters’ band of operation is determined by select components in the ampli
fi
er.
Performance Speci
fi
cations
Blank line
General
The following is a general set of speci
fi
cations for the generic VT-4D150 transmitter. Additional
speci
fi
cations, speci
fi
c to individual modules may be found in their respective sub manuals.
Type: MT-4D
Series
Transmitter.
Family:
VT-4D150 136 - 174 MHz.
Compatibility:
MT-2, MT-3 and MT-4 Series Radio Systems, P25 interoperable.
Frequency Range:
136 to 150 MHz., 150 to 174 MHz
RF Power Output:
0.5 to 2.0 or 2.0 to 8.0 W Continuous.
Modulation:
Analog:
11K0F3E or 16K0F3E (Frequency Modulation).
Project 25:
8K10F1E
System Impedance:
50
Ω
; Type N connector.
Duty Cycle:
100%; Continuous operation from -30°C to +60°C.
Emissions: -70
dBc
Transmitter Mismatch Protection:
20:1 VSWR at all phase angles.
Operating Temperature Range:
-30
˚
C to +60
˚
C.
Operating Humidity:
95% RH (non-condensing) at +25°C.
Operating Voltage:
+13.8 Vdc Nominal (range +10 to +17 Vdc),
+9.5 Vdc Regulated.
Transmit Current:
1.7 Amps at 2 Watts RF Power Output,
2.8 Amps at 8 Watts RF Power Output
Front Panel Controls:
NORM (repeat mode), OFF, and KEY TX (Tx on).
MIC MODE: ANALOG and DIGITAL.
