27
Appendix H: Viavi CX300 Tests
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Transmitter Digital Testing
Connect the CX300 and Zetron Radio as shown in Figure H-27.
Figure H-27: Transmitter Digital Testing
On the CX300, load Zetron preset 07 Tx Digital from your internal drive. Enter the correct RF frequency on the
CX300, set the MIC MODE switch on the front panel of the transmitter to Digital and flip the other switch to KEY
TX (or set the switch to NORM and key the transmitter through the RSS).
Computer running RSS
Tx Balanced Audio Input
(to pins B18 and Z18)
USB from
Computer to Rx
Tx RF OUT to
RF DUPLEX on CX300
TRANSMITTER
BUS
CNTL
MIC
A D
RF OUT
DIGITAL
OFF
NORM
KEY
ANALOG
TX
MIC MODE
IN
REF
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
AF OUTPUT
