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VT-4R150 VHF Project 25 Digital Transmitter Instruction Manual
1.4
VT-4R400 Transmitter Family Models
There are four distinct models in the UT-4R400 Transmitter family each with different bands of
operation and power outputs. The four models are as follows:
• VT-4R140-2
- 136-150 MHz band, 0.5-2.0 Watt
• VT-4R140-8
- 136-150 MHz band, 2.0-8.0 Watt
• VT-4R160-2
- 150-174 MHz band, 0.5-2.0 Watt
• VT-4R160-8
- 150-174 MHz band, 2.0-8.0 Watt
The transmitters' band of operation is determined by select components in the amplifier.
1.5
Performance Specifications
1.5.1
General
The following is a general set of specifications for the generic UT-4R400 transmitter. Additional
specifications, specific to individual modules may be found in their respective sub manuals.
Type:
MT-4 Series Transmitter.
Family:
VT-4 136 - 174 MHz.
Compatibility:
MT-2 and MT-3 Series Radio Systems, Project 25 interoperable.
Frequency Range:
1366 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:
-66 dBw
Transmitter Mismatch Protection:
20:1 VSWR at all phase angles.
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.
Transmit Current:
1.7 Amps at 2 Watts RF Power Output,
2.8 Amps at 8 Watts RF Power Output