Transmit Mdc Signaling System 25 Khz Modulation Tuning; Receiver Tuning; Service Monitor Setting; Table 5-5. Receiver Squelch Tuning - Motorola P100 Serie Servicehandbuch

Radio Programming and Tuning: Receiver Tuning
5.6.3

Transmit MDC Signaling System 25 kHz Modulation Tuning

1. Under the Alignment menu, select Tx Signaling System, then select MDC 25 KHz
(Figure 5-9. Tx MDC Signaling System Modulation 25 kHz Window).
2. Press PTT Toggle and switch to PTT on the test box. This will key up the radio.
3. Read the Modulation from the Service Monitor.
4. Change the MDC signaling system modulation setting until the Tx deviation value (in Service
Monitor) lies in the range of the 25 kHz channel (as shown inTable 5-4.) by using either the
Left/Right arrows on the slider or Up/Down arrows on the Working Softpot box.
5. Press PTT Toggle to dekey the radio.
6. Press Program to commit the softpot values into the codeplug.
7. Exit the Transmit MDC Signaling System Modulation 25 kHz function.
F1
F2
F3
F4
F5
Figure 5-9. Tx MDC Signaling System Modulation 25 kHz Window
5.7

Receiver Tuning

There are 6 variations of Receive Squelch Tuning: 12.5 kHz-Band Normal Squelch, 12.5 kHz-Band
Tight Squelch, 20 kHz-Band Normal Squelch, 20 kHz-Band Tight Squelch, 25 kHz-Band Normal
Squelch and 25 kHz-Band Tight Squelch.
5.7.1

Service Monitor Setting

1. Initial setup using the 8920A RF Communications Test Set

Table 5-5. Receiver Squelch Tuning

Squelch Type
Normal
Tight
SINAD Reading (dB)
6 – 8
15 – 17
5-13