MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS
Chapter 5: Codan Radio System Testing
Page 40
Deviation Level:
The deviation level adjustment is not required when connecting the transmitter in a repeater confi guration
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 (below DEMOD) from BANDPASS to 15 KHz LP as shown in Figure 5-26 for a
more accurate deviation reading without CTCSS encode. If the transmitter has CTCSS encode, leave
the Audio Filter on BANDPASS.
To adjust the transmitter balanced input, ensure that the AC-3E or CI-BC-4E Control Card is NOT
plugged into the subrack. FGEN1 is confi gured to inject a 1.0 KHz tone at -8.0 dBm (0.308 Vrms) into
the Tx Balanced audio input.
Figure 5-26: Transmitter Deviation Measurement
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