Codan Radio Communications VT-3-150-SN User Manual
3-2
VHF Amplifier Instruction Manual VT-3 132 - 174 MHz
It is recommended that the radio communications test set be frequency locked to an external
reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to
within its ±1 ppm frequency tolerance.
reference (WWVH, GPS, Loran C) so that the high stability oscillator may be accurately set to
within its ±1 ppm frequency tolerance.
3.4
Printed Circuitboard Numbering Convention
To ease troubleshooting and maintenance procedures, Daniels Electronics Limited has adopted a
printed circuitboard (PCB) numbering convention in which the last two digits of the circuitboard
number represent the circuitboard version. For example:
printed circuitboard (PCB) numbering convention in which the last two digits of the circuitboard
number represent the circuitboard version. For example:
• PCB number 43-912010 indicates circuitboard version 1.0;
• PCB number 50002-02 indicates circuitboard version 2.0.
• PCB number 50002-02 indicates circuitboard version 2.0.
All PCB's manufactured by Daniels Electronics are identified by one of the above conventions.
3.5
Standard Factory Settings and Jumper Configuration
The VT-3/150 Amplifier is factory configured as follows:
• Open collector configuration for Output Power Alarm.
• Open collector configuration for Antenna VSWR Alarm.
• Open collector configuration for Antenna VSWR Alarm.
The corresponding jumper settings are:
• Jumper JU1:
not installed
Output power alarm - linear output
• Jumper JU2:
installed
Output power alarm - open collector output
• Jumper JU3:
installed
Antenna VSWR alarm - open collector output
• Jumper JU4:
not installed
Antenna VSWR alarm - linear output
3.6
VT-3/150 Amplifier Alignment
invisible text
3.6.1
General
The VT-3/150 Amplifier is a frequency sensitive module that is factory assembled to operate in one
of two frequency bands: 132 to 150 MHz or 150 to 174 MHz. The amplifier requires 7 dBm of
input power and is continuously adjustable over the its power range of 2.0 to 8.0 Watts. The
VT-3/150 Amplifier provides Output Power and Antenna VSWR Alarm outputs which can be
configured for open collector output or linear operation. The amplifier's output power level and
alarm levels can be set without detaching the amplifier from the transmitter board. However, to
change the configuration of the output power alarm or the Antenna VSWR alarm, the VT-3/150
Amplifier must be detached from the MT-3 Transmitter Board. Refer to page 4-2 "VT-3/150 VHF
Amplifier Component Layout" for the location of solder jumpers JU1 to JU4.
of two frequency bands: 132 to 150 MHz or 150 to 174 MHz. The amplifier requires 7 dBm of
input power and is continuously adjustable over the its power range of 2.0 to 8.0 Watts. The
VT-3/150 Amplifier provides Output Power and Antenna VSWR Alarm outputs which can be
configured for open collector output or linear operation. The amplifier's output power level and
alarm levels can be set without detaching the amplifier from the transmitter board. However, to
change the configuration of the output power alarm or the Antenna VSWR alarm, the VT-3/150
Amplifier must be detached from the MT-3 Transmitter Board. Refer to page 4-2 "VT-3/150 VHF
Amplifier Component Layout" for the location of solder jumpers JU1 to JU4.