TN811 SM-3 System Regulator
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 2
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CODANCOMMS.COMTECHNICAL NOTE:
TN811, REV 3-1-0, © Mar 2013
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System Regulator Testing
The System Regulator module is designed with a convenient and easy test point built in to the front panel. This test
point allows a technician access to the DC supply and regulated voltages. Simply connect a standard Digital Volt
Meter (DVM) to the METER jacks on the front panel of the System Regulator as shown in Figure 1. Turn the rotary
switch to the desired position to measure the supply voltage, regulated voltage or audio output as shown in Table 1.
Note that the RSSI requires a carrier and the audio output requires an audio tone injected into the receiver.
Figure 1: System Regulator Testing
Table 1: System Regulator Rotary Switch Functions
Position Function Parameter
1 Supply Voltage +10 Vdc to +17 Vdc (+13.8 Vdc nominal)
2 +9.5 Volts Regulated +9.5 Vdc (± 0.1 Vdc)
3 Rx A Audio Receiver A Audio (NOT Rx Balanced Output)
4 Rx A Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
5 Rx B Audio Receiver B Audio (NOT Rx Balanced Output)
6 Rx B Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
7 Rx C Audio Receiver C Audio (NOT Rx Balanced Output)
8 Rx C Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
9 Rx D Audio Receiver D Audio (NOT Rx Balanced Output)
10 Rx D Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
11 Rx E Audio Receiver E Audio (NOT Rx Balanced Output)
12 Rx E Carrier Strength 0 Vdc to +5.0 Vdc based on received signal strength
TRANSMITTER
CNTL
BUS
MIC RF OUT
AD
ANALOG
DIGITAL
NORM
OFF
KEY TX
MICMODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
AD
RF NI
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
67
8
11
10
9
FUNCTION
12
REPEATER
CONTROL
RX B
TX B
RX A
TX A
PULL DOWN
TO REMOVE
9
5
3
7
11
15
9
13
3
7
11
15
SWITCH A SWITCH B
MIN MAXHOLD
REL
%
ms
Hz
RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
A
mA
COM
V
TEMPERATURE
A
MIN MAXHOLD
REL
%
ms
Hz
RANGE
dB
dB
ac+dc
ac+dc
ac+dc
ac+dc
F
nS
mA
mA
A
mV
V
mV
V
OFF
C
A
A
A
A
mA
COM
V
TEMPERATURE
A
AutoHOLD
LOGGING
SAVECANCEL
FAST MN MX
SETUP
YES
NO
DIGITAL MULTIMETER
CLEAR MEM
VIEW
DC
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