MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS | MAINTENANCE GUIDE
Chapter 6: Additional Radio System Tests Page 59
RADIO SYSTEM TESTING WITH THE ANTENNA
CONNECTED
VSWR
An antenna system VSWR test can be performed by connecting a Wattmeter such as the Bird Model 43
Wattmeter between the antenna port of the fi ltering equipment and the antenna as shown in Figure 6-2.
Measure the forward power and the refl ected power using the Wattmeter and calculate the VSWR. The
Wattmeter can also be placed between the transmitter and power amplifi er or between the transmitter
or power amplifi er and duplexer to measure the VSWR at these locations.
Figure 6-2: Transmitter VSWR Testing
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
Directional Wattmeter
To Antenna
RF OUT from Tx
to Duplexer
Antenna port on Duplexer
to Wattmeter
Summary of Contents for MT-4E
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