Radio Shack PRO-2039, Owner'S Manual

TURINING ON THE SCANNER/SETTING VOLUME AND SQUELCH

1.  Turn SQUELCH full counter-clockwise.

2.  Turn VOLUME clockwise until you hear a hissing sound.  The scanner
    automatically scans all 10 banks.

3.  Slowly turn SQUELCH clockwise, then leave it set to a point just after
    the hissing stops.

NOTE:  If the scanner picks up unwanted weak transmissions, turn SQUELCH
       clockwise to decrease the scanner's sensitivity to these signals. 
       If you want to listen to a weak or distant station, turn SQUELCH
       counter-clockwise.

SCANNING THE CHANNELS

To begin scanning the channels or to start scanning again after monitoring
a channel, press SCAN.  The scanner scans either up or down through all
non-locked channels in the active banks (see "Locking Out Channels").

NOTE:  An improper SQUELCH setting might keep the scanner from scanning
       (see "Turning on the Scanner/Setting Volume and Squelch").

TURNING CHANNEL-STORAGE BANKS ON AND OFF

When you first turn on the scanner, the scanner scans all ten channel
storage banks.  As the scanner scans a bank, the bar under the bank's
number flashes.

To turn off banks while scanning, repeatedly press the bank's number key
until the bar under the bank's number disappears.  The scanner does not
scan any of the stored channels within banks you have turned off.

NOTES:  You cannot turn off all banks.  There must be at least one active
        bank.

        You can manually select any channel in a bank, even if the bank is
        turned off.

To turn on banks while scanning, press the bank's number key until the bar
appears under the bank's number.