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8
Theory of Operation
transmitter Standby modes
The MT-3 series transmitters have eight different standby modes that trade off standby current
consumption for start-up speed.
Three jumpers are found on the transmitter mainboard:
J6
Continuously enables the +9.5 VDC switched supply.
J7
Selects the power source for the FM Audio Processor.
J18
Selects the enable line for the Synthesizer module.
Additionally, there is a jumper on the FM Audio Processor Board:
JU36 Determines the power source for the dual compression amplifiers.
If JU36 is not installed on the FM Audio Processor, both microphone and balanced audio
compression amplifiers will be disabled, eliminating the use of the front panel microphone jack
for local microphone operations. With this configuration, the balanced audio is routed around the
compression circuitry via JU11 (installed) with JU1 and JU2 removed.
mode Condition table
mode #
J6
J7
1a
out
y
1b
out
y
1c
out
y
2a
In
y
2b
In
y
2c
In
y
3
In
X
4
In
X
MT-3 FM Transmitter Mainboard Instruction Manual
IM20-MT3TXMN
Synthesizer/
J18
osc. State
y
Ptt Switched
y
Ptt Switched
y
Ptt Switched
X
always enabled
X
always enabled
X
always enabled
y
Ptt Switched
X
always enabled
audio Processor State
audio Processor
(8 V Switched)
Compression Ju36
Ptt Switched
Switched +8.0 V (X)
Ptt Switched
Continuous 9.5 V (y)
Ptt Switched
disabled (not Installed)
Ptt Switched
Switched +8.0 V (X)
Ptt Switched
Continuous 9.5 V (y)
Ptt Switched
disabled (not Installed)
always enabled
always enabled
doesn't matter
doesn't matter
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