System regulator testing, Figure 5-7: system regulator testing, Temperature – Codan Radio MT-3 User 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