11
Appendix H: Viavi CX300 Tests
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Receiver Digital / BER Testing
Connect the CX300 and Zetron Radio as shown in Figure H-7.
Figure H-7: Receiver Digital Testing
On the CX300, load Zetron preset 02 Rx Digital from your internal drive. Enter the correct RF frequency, and
ensure that the Mod Pattern is set for the Stored Speech test pattern (or optionally the 1011 test pattern).
Inject the correct NAC as shown in Figure H-8 and ensure that the receiver is operating. There are no specific
measurements to make on this test, just verify that the receiver is operating.
Figure H-8: Receiver Digital Check
Computer running RSS
USB from
Rx Balanced Audio Output
(from pins B26 and Z26)
Computer to Rx
RF OUTPUT from
CX300 to RF IN on Rx
AF INPUT 1
RECEIVER
SQ. DISABLE
OFF
NORM
BUS
CNTL
A D
RF I N
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
