Codan Radio Communications VT-3-150-SN User Manual
1-6
Audio Processor Board Instruction Manual
Notes:
If FM Audio Processor JU36 is not installed, both microphone and balanced audio compression
amplifiers will be disabled. This means that the front panel microphone jack will be disabled for
local microphone operations. When in this condition, balanced audio is routed around the
compression circuitry via JU11 (installed) with JU1 and JU2 removed.
amplifiers will be disabled. This means that the front panel microphone jack will be disabled for
local microphone operations. When in this condition, balanced audio is routed around the
compression circuitry via JU11 (installed) with JU1 and JU2 removed.
Table 4
Mode Condition Table
MODE
#
#
J6
J7
J18
Synthesizer/Osc
State
Audio
Processor State
(8V Switched)
Audio Processor
Compression
JU36
1a
OUT Y
Y
PTT Switched
PTT Switched
Switched +8.0V(X)
1b
OUT Y
Y
PTT Switched
PTT Switched
Continuous 9.5V(Y)
1c
OUT Y
Y
PTT Switched
PTT Switched
Disabled (Not Installed)
2a
IN
Y
X
Always enabled
PTT Switched
Switched +8.0V (X)
2b
IN
Y
X
Always enabled
PTT Switched
Continuous 9.5V (Y)
2c
IN
Y
X
Always enabled
PTT Switched
Disabled (Not Installed)
3
IN
X
Y
PTT Switched
Always enabled
Doesn’t matter
4
IN
X
X
Always enabled
Always enabled
Doesn’t matter
Table 5
Standby Mode Selection Table
MODE
#
Total Xmtr Standby
Current
Startup Time
1a
13 mA
6 mA
150 mS
150 mS
1b
22 mA
15 mA
10 mS
10 mS
1c
13 mA
6 mA
10 mS
10 mS
2a
165 mA
25 mA
150 mS
150 mS
2b
174 mA
34 mA
10 mS
10 mS
2c
165 mA
25 mA
10 mS
10 mS
3
27 mA
20 mA
10 mS
10 mS
4
175 mA
34 mA
10 mS
10 mS
Table 6
FM Audio Processor Total Current Consumption.
Compression configuration
Audio Processor
Current Draw
keyed / unkeyed
Compression enabled (JU36X)
15 mA/0.45 mA
Compression and microphone disabled
(JU36 Open)
(JU36 Open)
9.2 mA/0.45 mA
Compression enabled (JU36Y)
15 mA /9.2 mA