User Manual
Table Of Contents
- 1GENERAL
- 1.1Introduction
- 1.2Performance Specification
- 2THEORY OF OPERATION
- 2.1Amplifier Operation
- 2.2Power Requirements
- 2.3RF Circuitry
- 2.3.1VT-3/150 Lowpass Filter
- 2.4Power Control Circuitry
- 2.5Power Sensing Circuitry
- 2.5.1Output Power Sense
- 2.5.2VSWR Sense
- 2.5.3VSWR Overload
- 3VT-3/150 AMPLIFIER ALIGNMENT
- 3.1General
- 3.2Repair Note
- 3.3Recommended Test Equipment List
- 3.4Printed Circuitboard Numbering Convention
- 3.5Standard Factory Settings and Jumper Configuration
- 3.6VT-3/150 AmplifierAlignment
- 3.6.1General
- 3.6.2VT-3/150 Amplifier Adjustment
- 3.6.2.1General Set-Up
- 3.6.2.2Output Power Alarm (Forward Power)
- 3.6.2.3Output Power
- 3.6.2.4Antenna VSWR Alarm (Reverse Power)
- 3.6.2.5Antenna VSWR Overload
- 3.6.2.6Procedure Verification
- 4ILLUSTRATIONS AND SCHEMATIC DIAGRAMS
- 4.1VT-3/150 VHF Amplifier Component Layout
- 4.2VT-3/150 VHF Amplifier Schematic Diagram
- 4.3VT-3/150 VHF Lowpass Filter Component Layout
- 4.4VT-3/150 VHF Lowpass Filter Schematic Diagram
- 5PARTS LISTS
- 5.1VT-3/150 Amplifier Electrical Parts List
- 5.2VT-3/150 Low Pass Filter Electrical Parts List
- 5.3VT-3/150 Amplifier Mechanical Parts List
- 6REVISION HISTORY
DE
DANIELS
ELECTRONICS
1-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
2
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
configuration);
-
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.
Transmit
Current: 0.7 Amp
typical
; 1.1 Amp
maximum
Amplifier
Standby Current: less than 0.5 mA.
Amplifier
Enable:
Active
to
ground.
Amplifier
Enable
Response:
typically
overdamped, rising to within 90% of full power
within 5 msec;
maximum
(
underdamped)
overshoot of
30%.