System regulator testing, Figure 6-7: system regulator testing, Temperature – Codan Radio MT-4E Analog and P25 Digital - User Guide User Manual
Page 54
USER GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 6: Radio System Components
Page 46
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 6-7. Turn the rotary switch to the desired position to measure the supply
voltage, regulated voltage or audio output as shown in Table 6-2. Note that the RSSI requires a carrier
and the audio output requires an audio tone injected into the receiver.
Figure 6-7: System Regulator Testing
Table 6-2: 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
0 Vdc to +5.0 Vdc based on received signal strength
(0 Vdc is a low RF signal level, +5.0 Vdc is high)
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
(0 Vdc is a low RF signal level, +5.0 Vdc is high)
TRANSMITTER
CNTL
BUS
MIC
RF OUT
A D
ANALOG
DIGITAL
NORM
OFF
KEY TX
MIC MODE
REF
IN
USB
FREQUENCY (MHz)
MADE IN CANADA
MODEL # CODE
RECEIVER
NORM
SQ. DISABLE
OFF
CNTL
BUS
A D
RF N
I
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
6
7
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 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