Codan Radio MT-3 - Manual (Page 44)

USER GUIDE | MT-3 ANALOG RADIO SYSTEMS
Chapter 5: Radio System Components Page 36
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 5-7. Turn the rotary switch to the desired position to measure the supply
voltage, regulated voltages, receiver carrier strength, audio output or Priority COR as shown in Table
5-2. Note that the RSSI and Priority COR requires a carrier and the audio output requires an audio tone
injected into the receiver.
Figure 5-7: System Regulator Testing
Table 5-2: 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 +1 Vdc to +5 Vdc based on received signal strength
(+1 Vdc is a low RF signal level, +5 Vdc is high)
5 Rx B Audio Receiver B Audio (NOT Rx Balanced Output)
6 Rx B Carrier Strength +1 Vdc to +5 Vdc based on received signal strength
(+1 Vdc is a low RF signal level, +5 Vdc is high)
7 Rx A Priority COR Open Collector Output; Measure with an Ohm
meter. Ground for Active; Open for Inactive
10 Rx B Priority COR Open Collector Output; Measure with an Ohm
meter. Ground for Active; Open for Inactive
11 Rx A +6.0 Volts +6.0 Vdc (± 0.1 Vdc)
12 Rx B +6.0 Volts +6.0 Vdc (± 0.1 Vdc)
VOL
SYSTEM REGULATOR
METER
+
-
MADE IN CANADA
ON
OFF
SPKR
INT
EXT
EXT
SPKR
OFF
POWER
ON
2
1
5
4
3
6 7
8
11
10
9
FUNCTION 12
MIN MAX HOLD 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 MAX HOLD 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
SAVE CANCEL
FAST MN MX
SETUP
YES
NO
DIGITAL MULTIMETER
CLEAR MEM VIEW
DC
5 7
5 7
AUDIO
CONTROL
RX A
RX B
TX A
TX B
TX A
TX B
5
9
13
5
9
13
PULL DOWN
TO REMOVE
T X
REFERENCE
INPUT
OFF
KEY TX
MIC
RF OUT
NORM
TRANSMITTER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
SQ . DI SA B L E
N
O
RM O
F F
RF N I
REFERENCE
INPUT
RECEIVER
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE