Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Manual de usuario descargar pdf (Pagina 48)

MAINTENANCE GUIDE | MT-4E ANALOG & P25 DIGITAL RADIO SYSTEMS

Chapter 5: Codan Radio System TestingPage 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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Codan-radio MT-4E Analog and P25 Digital - Maintenance Guide Manual de usuario Pagina 48