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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TEST PORT<br />
SCOPE<br />
100V MAX 100V MAX 100V MAX<br />
CH1<br />
CH2<br />
DVM<br />
MIC<br />
HELP<br />
RETURN<br />
AUDIO I/O<br />
MODE<br />
TAB<br />
SHIFT<br />
BKSP<br />
HOLD<br />
GHI<br />
4<br />
PQRS<br />
7<br />
*<br />
JKL<br />
5<br />
TUV<br />
8<br />
0<br />
MNO<br />
6<br />
WXYZ<br />
9<br />
ESC ENTER POWER<br />
#<br />
125 W MAX<br />
VOLUME<br />
SQUELCH<br />
CNTL<br />
BUS<br />
REF A<br />
IN<br />
MICMODE<br />
USB<br />
FREQUENCY (MHz)<br />
D<br />
MIC<br />
MADE IN CANADA<br />
MODEL # CODE<br />
NORM<br />
OFF<br />
KEY TX<br />
ANALOG<br />
DIGITAL<br />
RF OUT<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 />
EXT<br />
SPKR<br />
MADE IN CANADA<br />
OFF<br />
Chapter 5: <strong>Daniels</strong> <strong>Radio</strong> System Testing 47<br />
Transmitter Modulation Fidelity Testing<br />
Connect the IFR 2975 <strong>and</strong> <strong>Daniels</strong> <strong>Radio</strong> as shown in Figure 5-33.<br />
Computer running RSS<br />
ABC<br />
1 2<br />
3<br />
DEF<br />
+<br />
-<br />
TRANSMITTER<br />
SYSTEM REGULATOR<br />
.<br />
POWER<br />
ON<br />
GEN T/R ANT<br />
ON<br />
OFF<br />
SPKR<br />
INT<br />
EXT<br />
DANIELS<br />
ELECTRONICS LTD.<br />
DANIELS<br />
ELECTRONICS LTD.<br />
USB from<br />
Computer to Tx<br />
Tx RF OUT to T/R port on IFR 2975<br />
Figure 5-33: Transmitter Modulation Fidelity Testing<br />
On the IFR 2975, recall <strong>Daniels</strong> setup 9 (Tx_ModFid) from your internal drive. Enter the correct RF<br />
frequency on the IFR 2975 <strong>and</strong> set the transmitter front panel switch to NORM. The MIC MODE switch<br />
on the front panel can be set to either <strong>Digital</strong> or <strong>Analog</strong> (this test does not make use of the front panel<br />
switch).<br />
In the transmitter RSS, enter the Service section <strong>and</strong> click on “Test Patterns”. Ensure the transmitter<br />
frequency is in the frequency box. In the Select Pattern window select “C4FM Modulation Fidelity”.<br />
Click on the “Key Tx” button as shown in Figure 5-34 <strong>and</strong> the transmitter will begin generating the test<br />
pattern out the RF output.<br />
Figure 5-34: RSS Transmitter Modulation Fidelity Test Pattern<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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