Rated Volume Tuning - Motorola CP150 Basic Service Manual

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4.5.1 Rated Volume Tuning

Note: When using test box RLN4460, the received audio output is taken from the AC/DC
METER OUT terminals with the METER OUT rotary switch set to RX. The rated audio
tuning procedure automatically configures the radio for 25 KHz. This means that a
3 kHz (for 25 kHz channel spacing) deviation must always be used, irrespective of the
radio channel bandwidth.
Perform the rated volume tuning procedure as follows:
1. Under the Rx Align menu, select Rated Volume (Figure 4-9).
2. Inject a -47 dBm rf signal modulated with 1 kHz tone at 3 KHz (for 25 kHz channel spacing).
3. Adjust the softpot value by using the slider, keying in the edit box (press ENTER to confirm the
selection or send a softpot value), or via the spin controls. Repeat this until 500 mW (3.46 V)
audio power is obtained. Rated Audio tuning is only done for 25 kHz channel spacing.
4. Press Program to commit the softpot value into the radio.
5. Exit the rated volume tuning function.
Figure 4-9. Rated Volume Tuning Window
Receiver Tuning