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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FREQUENCY (MHz)<br />
SWITCH A SWITCH B<br />
REF A D<br />
15 3 15 3 IN<br />
13<br />
5<br />
NORM<br />
OFF<br />
11 7 11 7<br />
KEY TX<br />
9<br />
9<br />
MICMODE<br />
ANALOG<br />
DIGITAL<br />
TX A<br />
USB<br />
CI-RC-4L<br />
RX A<br />
CNTL<br />
BUS<br />
TX B<br />
RX B<br />
PULL DOWN<br />
TO REMOVE<br />
MIC<br />
MADE IN CANADA<br />
MODEL # CODE<br />
USB<br />
RF OUT<br />
CNTL<br />
BUS<br />
A<br />
D<br />
FREQUENCY (MHz)<br />
SQ. DISABLE<br />
NORM<br />
OFF<br />
REF<br />
IN<br />
MADE IN CANADA<br />
MODEL # CODE<br />
RF<br />
IN<br />
FUNCTION<br />
12<br />
1<br />
11<br />
2<br />
10<br />
3<br />
9<br />
4<br />
8<br />
5<br />
7 6<br />
+<br />
VOL METER<br />
-<br />
ON<br />
OFF<br />
EXT<br />
SPKR<br />
MADE IN CANADA<br />
OFF<br />
62<br />
Chapter 6: Additional <strong>Radio</strong> System Tests<br />
Spurious Signals over the Air<br />
A spurious signal test can be performed by keying up the transmitter over the air <strong>and</strong> observing the<br />
spectrum using a Spectrum Analyzer with an antenna on the input port as shown in Figure 6-5.<br />
On the Spectrum Analyzer, attenuate the incoming RF signal so that the RF carrier does not extend<br />
beyond the range of the display on the Spectrum Analyzer (this will overdrive the receiver of the analyzer<br />
causing erroneous spurs to be shown in the spectrum).<br />
Look at the spectrum <strong>and</strong> ensure there are no large spurs being generated by the radio system.<br />
<strong>Radio</strong> System Transmitting Over the Air<br />
REPEATER<br />
CONTROL<br />
TRANSMITTER<br />
RECEIVER<br />
SYSTEM REGULATOR<br />
SPKR<br />
INT<br />
EXT<br />
POWER<br />
ON<br />
DANIELS<br />
ELECTRONICS LTD.<br />
DANIELS<br />
ELECTRONICS LTD.<br />
DANIELS<br />
ELECTRONICS LTD.<br />
Spectrum Analyzer<br />
Figure 6-5: Spurious Signals over the Air Test<br />
Maintenance<br />
Guide<br />
MG-001 <strong>Daniels</strong> <strong>MT</strong>-<strong>4E</strong> <strong>Radio</strong> <strong>Systems</strong><br />
www.danelec.com
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