Grecom PSR-310 Owner's Manual page 60

By default, TUNE mode is paused when first activated. Press PSE to begin
searching from the current frequency.
Press the 5 or 6 keys on the 5-way pushbutton pad to change the search
direction.
Press the FrL/O softkey to add a found frequency to the lockout list.
Press the MODE softkey to change the receive mode (AM, FM, NFM) from
the default for the current frequency range (au).
Press STOR to create a new CONV object using the found frequency.
Use the keypad to enter a new frequency, and press ENT to make that the
TUNE frequency.
Using FUNC TUNE from any other mode will load the last active frequency
from the other mode into TUNE. For example, pressing FUNC TUNE while
parked on a trunked radio TGRP will load the control channel frequency into
the TUNE mode if the control channel frequency is the last frequency that
the scanner checked while scanning.
Dedicated TUNE mode will always check for the presence of encoded
squelch modulation each time it finds an active frequency. If a valid encoded
squelch code is found, it will be shown on the display, and stored automati-
cally when you press STOR to create a new CONV object.
Dedicated TUNE mode also displays information about trunking control
channels and trunked voice channels it finds while tuning through the RF
spectrum. The following information is displayed for the various trunking
modes:
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