Rated Volume Tuning; Figure 5-9. Rated Volume Tuning Window - Motorola EP450 Basic Service Manual

Radio Alignment Procedures: Receiver Tuning
5.5.1

Rated Volume Tuning

Note: When using test box RLN4460, the received audio output is taken from the AC/DC
Perform the rated volume tuning procedure as follows:
1. Under the Rx Align menu, select Rated Volume
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
4. Press Program to commit the softpot value into the radio.
5. Exit the rated volume tuning function.
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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.

Figure 5-9. Rated Volume Tuning Window

selection or send a softpot value), or via the spin controls. Repeat this until 500 mW (3.24 V)
audio power is obtained. Rated Audio tuning is only done for 25 kHz channel spacing.
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(Figure 5-9).
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December 3, 2003