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Channel Selection

4-Channel Model

To select a channel, press one of the four channel

select buttons (7) for the desired channel. If the

channel is available, the green, channel-selected LED

(8) will light. If it is not, the error tone will sound.

128-Channel Model

To select a channel, use the up/down scroll buttons

(7) to display the desired channel number. The

channel may be used as soon as it is displayed.

Communication Procedures

Receiving Calls

When a call is received, the speaker will unmute (open)

and the red LED indicator (4) will ﬂash (Channel Busy).

Unless you have some form of selective signalling on a

channel, you will hear all calls on the channel.

Private Line (CTCSS) Signalling

If you use this form of signalling on your receive

channels, your speaker will unmute only when it

receives a call accompanied by this form of

signalling. This greatly reduces interference heard

on a channel, reducing operator fatigue.

This form of reception can be disabled using the

monitor button (5).

Channel Selection, Communication Procedures

English

Outgoing Calls

When you have selected a channel, you are ready

to transmit. You should only make a call when the

channel is free (red indicator (4) does not ﬂash). If

in doubt, press the monitor button (5) to listen to the

channel.

Take the microphone out of its holder. Press the

transmit (PTT) key (11) on the side of the

microphone while talking, release it while listening.

Speak in a normal tone of voice, keeping a distance

of 5-10 cm from the microphone. When transmitting

the red indicator (4) will light continuously. Your

radio may be conﬁgured for 'Transmit Inhibit' under

certain conditions (e.g. when the channel is in use

by other users) in which case, the error tone will

sound when you press the PTT key to indicate that

transmission is inhibited.

If your radio is equipped with a transmit time out

timer (TOT), a warning tone will sound a few

seconds before the transmission is cut off. The

radio may be programmed to inhibit retransmission

within a preset time.

Hang up the microphone in its holder when your

conversation has ended.