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APPENDIX G: VIAVI 8800 TEST PROCEDURES
MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Deviation Level:
The deviation level adjustment is not required when connecting the transmitter in a repeater configuration
using LVDS Serial Data. The audio level / deviation level adjustment can be done on both the Tx Balanced
Audio Input and the Auxiliary Balanced Input (1 and 2). The Auxiliary Balanced Input is only available on the
AC-3E Control Card or CI-BC-4E Base Control Card.
Change the Audio Filter (AFBW near the top left corner) from 0.3-3k BP to 15k LP as shown in Figure G-24 for a
more accurate deviation reading without CTCSS encode. If the transmitter has CTCSS encode, leave the Audio
Filter on 0.3-3k BP.
To adjust the transmitter balanced input, ensure that the AC-3E or CI-BC-4E Control Card is NOT plugged
into the subrack. AF Gen 1 is configured to inject a 1.0 KHz tone at -8.0 dBm (0.308 Vrms) into the transmitter
balanced input.
Figure G-24: Transmitter Deviation Measurement
