Standard Horizon Hx500s Owner's Manual page 15

ANTENNA CONNECTOR
The supplied CAT460 flexible antenna is attached here.
PUSH-TO-TALK ( PTT ) SWITCH
When pushed activates the transmitter.
SQUELCH ( SQL ) SWITCH
Sets the point at which random noise on the channel will not activate the
audio circuits but a received signal does. This point is called the Squelch
threshold. Further adjustment of the squelch control will degrade the re-
ception of wanted transmissions. To quickly open the squelch and moni-
tor a channel before transmitting, press and hold this key for 3 seconds.
POWER SWITCH
Press and hold in this switch for 2 seconds to toggle the transceiver's
power "on" and "off."
[ ( UP )] KEY
Press to select a desired channel. Each press increases the channel
number. When held down, the channels increase continuously.
[ ( DOWN )] KEY
Press to select a desired channel. Each press decreases the channel
number. When held down, the channels decrease continuously.
MICROPHONE
The internal microphone is located here.
[ 16/9 ] KEY
Immediately recalls channel 16 from any marine channel or band loca-
tion. Holding down this key recalls channel 9.
[ WX ] KEY
Immediately recalls the last-used NOAA Weather Channel from any chan-
nel location. Recalls the previously- selected working channel when the
[ WX ] key is pressed again.
Secondary use:
When the [ 16/9 ] key is held and the [ WX ] key is pressed, the radio will
change the marine channel between the USA, International, and Cana-
dian channels.
HX500S Page 13