PSC PSRF-1000 System Manual page 52

RF Beeper
Frequency
48
This setting affects the frequency at which the ACK beep is sounded,
and is independent of the frequency setting for the good read beep.
When the ACK beep is sounded at a different frequency than the good
read beep, this can provide a clearer distinction between the tones.
Select low frequency (760Hz), medium frequency (1250Hz), or high
frequency (2400Hz).
SET -------------------------------------------
RF Beeper Low
Frequency
RF Beeper Medium
Frequency
RF Beeper High
Frequency
END ------------------------------------------
Feature is specific to scanner ONLY
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PowerScan ™ RF Scanner