MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics
MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics
MT-4E Analog and P25 Digital Radio Systems - Daniels Electronics
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SWITCH A SWITCH B<br />
15 3 15 3<br />
13<br />
5<br />
11 7 11 7<br />
9<br />
9<br />
PULL DOWN<br />
TO REMOVE<br />
FREQUENCY (MHz)<br />
MADE IN CANADA<br />
MODEL # CODE<br />
FREQUENCY (MHz)<br />
MADE IN CANADA<br />
MODEL # CODE<br />
MADE IN CANADA<br />
Chapter 6: Additional <strong>Radio</strong> System Tests 59<br />
RADIO SYSTEM TESTING WITH THE ANTENNA<br />
CONNECTED<br />
VSWR<br />
An antenna system VSWR test can be performed by connecting a Wattmeter such as the Bird Model 43<br />
Wattmeter between the antenna port of the fi ltering equipment <strong>and</strong> the antenna as shown in Figure 6-2.<br />
Measure the forward power <strong>and</strong> the refl ected power using the Wattmeter <strong>and</strong> calculate the VSWR. The<br />
Wattmeter can also be placed between the transmitter <strong>and</strong> power amplifi er or between the transmitter<br />
or power amplifi er <strong>and</strong> duplexer to measure the VSWR at these locations.<br />
REPEATER<br />
CONTROL<br />
TRANSMITTER<br />
RECEIVER<br />
SYSTEM REGULATOR<br />
FUNCTION<br />
12<br />
1<br />
Directional Wattmeter<br />
REF A D<br />
IN<br />
MICMODE<br />
TX A<br />
USB<br />
RX A<br />
CNTL<br />
BUS<br />
TX B<br />
MIC<br />
RX B<br />
A D<br />
NORM<br />
OFF<br />
KEY TX<br />
ANALOG<br />
DIGITAL<br />
USB<br />
RF OUT<br />
CNTL<br />
BUS<br />
SQ. DISABLE<br />
NORM<br />
OFF<br />
REF<br />
IN<br />
RF<br />
IN<br />
11<br />
10<br />
9<br />
8<br />
VOL<br />
ON<br />
OFF<br />
SPKR<br />
INT<br />
EXT<br />
EXT<br />
7<br />
6<br />
+<br />
METER<br />
-<br />
2<br />
3<br />
4<br />
5<br />
POWER<br />
ON<br />
OFF<br />
SPKR<br />
CI-RC-4L<br />
DANIELS<br />
ELECTRONICS LTD.<br />
DANIELS<br />
ELECTRONICS LTD.<br />
DANIELS<br />
ELECTRONICS LTD.<br />
RF OUT from Tx<br />
to Duplexer<br />
To Antenna<br />
Antenna port on Duplexer<br />
to Wattmeter<br />
Figure 6-2: Transmitter VSWR Testing<br />
MG-001 <strong>Daniels</strong> <strong>MT</strong>-<strong>4E</strong> <strong>Radio</strong> <strong>Systems</strong><br />
www.danelec.com<br />
Maintenance<br />
Guide
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