Transmit Mdc Signaling System 12.5 Khz Modulation Tuning; Figure 5-7. Tx Mdc Signaling System Modulation 12.5 Khz Window - Motorola CP185 Basic Service Manual

Radio Programming and Tuning: Transmit MDC Signaling System Modulation Tuning
ii. Mode: STANDARD
iii. Dev: (Reading for Transmit Modulation)
c. On R2600, select "RF" under "CURSOR ZONE":
i. RF Control: MONITOR
ii. Preset: --
iii. B/W: NB
iv. Freq: Frequency Point (F1–F5) on Tuner
v. Output Lvl: 20 dBm
vi. Gen RF Out: RF I/O
vii. Modulation Type: FM
d. On R2600, select "AUD" under "CURSOR ZONE":
i. Fixed 1kHz: 0.100 V. Enable (~)
ii. Synth: Disable (x)
iii. DTMF: Disable (x)
iv. External: Disable (x)
5.6.2

Transmit MDC Signaling System 12.5 kHz Modulation Tuning

1. Under the Alignment menu, select Tx Signaling System, then select MDC 12.5 KHz

(Figure 5-7. Tx MDC Signaling System Modulation 12.5 kHz Window).

2. Press PTT Toggle and switch to PTT on the test box. This will key up the radio.
3. Read the MDC Signaling System 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 12.5 kHz channel (as shown in Table 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 12.5 kHz function.
8. If 25 kHz channels are used, perform Transmit MDC Signaling System 25 kHz Modulation
Tuning.
F1
F2
F3
F4
F5
Figure 5-7. Tx MDC Signaling System Modulation 12.5 kHz Window
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