Standard Horizon HX751 Owner's Manual page 17

PTT ( PUSH-TO-TALK ) Switch
When pushed activates the transmitter.
Keypad
[ VOL ] Key
Press this key to activate the volume adjusting mode. Press the [ ] or [ ]
key to adjust the receiver audio volume level.
[ SQL ] Key
Press this key to activate the squelch adjusting mode. Press the [ ] or [ ]
key to adjust the squelch threshold level.
Press and hold this key for 1 second to open the squelch, allowing you to
monitor the operating channel. Release the key to resume normal (quiet)
monitoring.
[ ( UP )] Key
This key is used to change the operating channel, receiver volume level,
and squelch threshold level.
Press the key momentarily, the channel (or level) increases one step. Hold-
ing the key, the channel (or level) increases continuously.
[ ( DOWN )] Key
This key is used to change the operating channel, receiver volume level,
and squelch threshold level.
Press the key momentarily, the channel (or level) decreases one step.
Holding the key, the channel (or level) decreases continuously.
[ H/L ( )] Key
Press this key to toggle the transmitter output power between "Normal" (6
Watts), "High" (5 Watts), "Medium" (2.5 Watts), and "Low" (1 Watt) power.
This key does not function on the "Transmission Inhibited" and "Low power
only" channels.
Secondary use:
Hold down this key to lock the keypad (except the PTT, [ VOL ] , [ SQL ] ,
[ POWER ( )] , [ LIGHT ( STROBE )] , and [ H/L ( )] keys) so that they are
not accidentally changed. The " " icon will appear at the bottom right
corner on the display, to indicate that the functions are locked. Hold down
this key until the " " icon disappears to unlock the radio.
[ SCAN ( DW )] Key
Starts/stops the Memory scanning and Priority scanning on the preset chan-
nels and the programmed channels. When Memory scanning, press and
hold this key to turn on and off priority scan ("P" icon is shown on the
bottom left side of the display during Priority scanning).
HX751 Page 17