Standard Horizon HX270E Owner's Manual page 11

DW KEY
Press the DW key, scan for voice communications on the priority chan-
nel and another selected channel until a signal is received on either
channel (Dual Watch). Refer to section "5.8 DUAL WATCH" for details.
H/L KEY
Toggles the transmitter power level between High (5 Watts), Medium
(2.5 Watts), and Low (1 Watt) of output. Does not operate on "low power
only" and transmission-inhibit channels.
When operating on Canadian channel 13, or USA channels 13 or 67,
pressing this key momentarily toggles the power level from Low power
to Medium or High power.
Hold down this key to lock the displayed channel functions (except the
H/L, PTT, and SQL keys) so that they are not accidentally changed. The
key lock symbol " " will appear, to indicate that the functions are locked.
Hold down until the key lock symbol " " disappears to unlock the ra-
dio.
SCAN KEY
Starts scanning and Priority scanning of programmed channels. When
scanning, press and hold this key to turn on and off Priority scan (P is
shown on the left side of the display during Priority scanning).
PRESET KEY
Immediately recalls one of up to eight user preset memories for opera-
tion (shown as 1 1 1 1 1 -8 8 8 8 8 on the LCD). Pressing this key repeatedly scrolls
through the preset memory channels.
MEM KEY
Press to select a channel for scanning. Press this key again to delete a
memorized channel. ("MEM" appears on the LCD display during memory
operation).
HX270E Page 9