Codan Radio Communications VT-3-150-SN User Manual
3-2
Transmitter Main Board Instruction Manual
Radio communications test set :
Marconi Instruments 2955R
VSWR 3:1 mismatch load:
JFW 50T-035-3.0:1
Alignment Tool:
Johanson 4192
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.
3.5
Standard Factory Settings and Jumper Configuration
Standard factory settings and the associated jumper configuration for each module of the MT-3
series transmitter are given below.
series transmitter are given below.
3.5.1 MT-3 Transmitter Board Factory Configuration
The MT-3 Transmitter Main Board is factory configured as follows:
• Transmitter standby mode 1 (lowest standby current consumption).
• Receiver squelched, de-emphasized audio amplifier disabled.
• Optional relay not installed.
• Separate amplifier power sense outputs.
• Receiver squelched, de-emphasized audio amplifier disabled.
• Optional relay not installed.
• Separate amplifier power sense outputs.
The corresponding jumper settings are:
• Jumper J2:
'x' position
Optional relay configuration
• Jumper J3:
no connection
Optional relay configuration
• Jumper J4:
'y' position
Optional relay configuration
• Jumper J6:
not installed
Transmitter standby mode select - Mode 1
• Jumper J7:
'y' position
Audio processor standby mode select
• Jumper J9:
not installed
Receiver audio ac/dc input coupling
• Jumper J12:
not installed
Amplifier power sense output configuration
• Jumper J13:
'x' position
Amplifier power sense output configuration
• Jumper J14:
'x' position
Amplifier power sense output configuration
• Jumper J15:
'x' position
Amplifier power sense output configuration
• Jumper J16:
'x' position
Microphone configuration
• Jumper J17:
installed
Microphone output line
• Jumper J18:
'y' position
Synthesizer or crystal module standby mode select
• Jumper J19:
'x' position
600
Ω
audio transformer enable. 'y' position disables
• Jumper J20:
'x' position
600
Ω
audio transformer enable. 'y' position disables
• Jumper J21:
not installed
+8 Vdc audio processor supply bypass
• Jumper J22:
'x' position
600
Ω
audio transformer enable. 'y' position disables
• Jumper J23:
'x' position
600
Ω
audio transformer enable. 'y' position disables
• Jumper J24:
installed
Subtone #2 output enable
• Jumper J25:
'x' position
Audio output enable