Grecom PSR-310 Owner's Manual page 62

To enter LMIT mode, press the SRCH key on the keypad repeatedly until
the display indicates LMIT search as follows:
Use the Lmts softkey to set the lower and upper frequency limits for your
limit search.
NOTE: When a signal is being received, the Lmts softkey (F1) changes to
FrL/O . You can access the Lmts softkey by pressing FUNC F1 when the
F1 key function is FrL/O .
Press the 5 or 6 keys on the 5-way pushbutton pad to change the search
direction.
Press the MODE softkey to change the receive mode (AM, FM, NFM) from
the default for the current frequency range (au).
Press the FrL/O softkey to add a found frequency to the lockout list.
Press the STOR softkey to create a new CONV object using the found fre-
quency.
Using dedicated SRVC mode
Your scanner's dedicated SRVC search modes provide you with the ability to
instantly access each of the scanner's service search ranges without creat-
ing a new SRVC object.
To activate dedicated SRVC search mode, press the SRCH key on the key-
pad repeatedly until the desired service search is indicated on the display.
The following service searches are available:
Railroad - searches the Association of American Railroads (AAR) VHF rail-
road frequencies used in the US and Canada
Public Safety (PubSafety) - Searches commonly used public safety fre-
quencies. Groups are as follows:
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