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System
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7.1.2 Operation
The optional handset is intended for VHF radiotelephony only. There will be no DSC
functionality supported except for:
• The functionality or lifting the CU handset follows the default handset on the main
radio (see Section DSC receive), when receiving a DSC call.
• Possibility to mute DSC alarm sound – not handle the DSC call.
7.1.3 ON/OFF
The semi-intelligent handset will always be turned off default after VHF unit is powered. The
off state is indicated by no activity or light in the CU.
The unit can be turned on and off (press for 1 second) on the ON button.
If the main unit is powered off the handset control unit is always turned off.
7.1.4 Channel Selection
Channel selection is done using exactly the method described for VHF using
and .
On the optional handset control unit these buttons are marked
and respectively.
Channel change requests are sent to the main VHF unit and the main unit will change
channel and update the CU display. The same channel number will be applied to all the
displays in the system.
A quick channel 16 selection is available pushing .
7.1.5 Volume
Volume is controlled using the and buttons.
Pushing these buttons will only affect the internal CU speaker as well as optionally con-
nected external CU speakers. The volume adjustment will only be active for the specific local
handset. Therefore the volume bar on the VHF main unit is not updated during adjustment.
A local volume indicator always shows the speaker volume on the CU. If the volume is
adjusted to the mute level the VOL LED will blink (1 Hz).
The earpiece volume in the handset connected to the CU is adjusted using the
and buttons while holding down the button.
This alternative usage of the button will only be possible while:
• Handset is hooked off, and
• No active alarm sound to be muted
After power-up all volume levels set during last operation are restored as they were before
power-down.
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