2-1
2. OPERATION
2.1 Controls
This section describes the controls of the Transceiver Unit (including the optional mi-
crophone) and the Handset HS-4721.
2.1.1 Transceiver Unit
No. Control Description
1 VOL
(Volume Control
Knob)
• Adjust the audio volume level. Turn this knob clockwise to increase
the audio volume level.
• Control the listenback volume in the PA or Fog mode.
Note: Turn off the set with minimum volume. When you turn on the set,
adjust the volume to a comfortable level. This allows you to hear distress
calls and raw voice clearly.
2 SQL
(Squelch Control)
Adjust this control clockwise to set the point at which random noise on
the channel does not activate the audio circuits but a received signal
does. This point is called the squelch threshold. Further adjustment of
the squelch control may degrade reception of wanted transmissions.
3 Soft keys The three soft keys functions can be customized on the Setup Menu.
See section 4.12 "Soft Keys". When one of the soft keys is pressed
briefly, all the functions of the soft keys appear above their associated
keys.
4 16/9 • Momentary press: Recall CH16 from any channel location.
• Long press: Recall CH9. (CH9 is used in some parts of the world as
an alternative calling channel to CH16.)
Press the key again to return to the previously selected working chan-
nel.
5 H/L Toggle between 25 W (High) and 1 W (Low) power. When the TX output
power is set to "Low" while the transceiver is on channel 13 or 67, the
output power is temporarily switched from "Low" to "High" power until
the PTT switch is released. The H/L key does not function on transmit
inhibited and low power only channels.
6 CALL/MENU • Momentary press: Open the [DSC Menu].
• Long press: Open the [Setup Menu].
MEM
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