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DANIELS
ELECTRONICS
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VT-4B150 VHF Project 25 Digital Base Transmitter Instruction Manual
1.4
Performance Specifications
1.4.1
General
The following is a general set of specifications for the generic VT-4/150 transmitter. Additional
specifications, specific to individual modules may be found in their respective sub manuals.
Type:
MT-4 Series Transmitter.
Family:
VT-4B 136 - 174 MHz.
Compatibility:
MT-2 Series and MT-3 Series Radio Systems, Project 25
interoperable.
Frequency Range:
136 to 150 MHz., 150 to 174 MHz
RF Power Output:
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
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
Front Panel Controls:
NORM (repeat mode), OFF, and KEY TX (Tx on).
PTT Activation:
• Active to ground;
• Microphone activated;
• Front Panel switch:
KEY TX;
PTT Time-Out-Timer:
Programmable from 1 sec. to 8 hrs. (default 5 min.), using
Radio Programming Software package.
Channel Spacing:
12.5 kHz /15 kHz or 25 kHz / 30 kHz.
