Bedienungsanleitung Midland Alan HP 406 (Seite 39 von 146) (Deutsch, Englisch, Französisch, Italienisch, Portugiesisch, Spanisch)

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Basic operations 11

5.2 Adjusting volume

With the device turned on, rotate the PWR/VOL knob clockwise to

increase the volume or counterclockwise to reduce it. For a normal use

we suggest to keep it to the middle position.

5.3 Channel selection

If your radio has been programmed with more than one channel you can

easily change it. To select a channel, turn the channel selector knob

clockwise or counterclockwise until the channel indicator on the knob

matches the wished channel.

If the selected channel has not previously been programmed, the green

status LED remains permanently lit and a low error tone is produced.

5.4 Reception

Your radio could have been previously programmed to work, channel by

channel, in different modes: Open traffic, CTCSS/DCS or Selective

Call. Please have a look to each description and ask your radio network

manager or dealer which mode your radio channels have been program-

med.

• OPEN TRAFFIC - in this mode you will hear any communication

which will be transmitted on the selected channel. When no signals

are received, the circuit called Squelch will mute the audio of your

device in order to not let you hear the annoying background noise.

When the signals are received, the squelch will open (i.e. it will auto-

matically disabled), the status LED will glow green and you will hear

the message from the speaker. At the end of message the squelch will

shut automatically.

• CTCSS/DCS (Continuous Tone Code Squelch System - Digital

Coded Squelch) - they are systems which use particular TX signaling

(a continuous sub-audio tone for CTCSS or a digital sub-audio code

for DCS, both transmitted below the audio band, so not audible) as

an access “key” to work a repeater or to unlock the party’s squelch,

which is sensitive to this signaling only. This last condition allows to

share more radio networks on the same frequency. In this case you

will receive only messages coming from parties sending a proper TX

signaling, i.e. belonging to your group. During CTCSS/DCS operation,

only the reception of the appropriate CTCSS/DCS tone/code enables

the speaker, glowing amber the status LED. Eventual signals without

the appropriate CTCSS/DCS tone will leave the speaker muted and

will glow green the status LED. For further details please refer to the

chapter 6.

• SELECTIVE CALL: It is a signalling system which uses audio tones

in sequence (usually “5 tones” selective calls) to call a specific station

or group(s). In this case you will only receive calls that have your

selective call identification code (a number) or calls sent to the group

you belong. For further details please refer to the chapter 6.

 CTCSS/DCS and Selective Call can be combined together.

 CTCSS/DCS and Selective Call allow to share the same frequency

among more than one radio network, however they are just useful

to avoid disturbing stations not owning of the same network with

messages not related to them. In any case, if more than one sta-

tion is transmitting at the same time on the same channel, this will

cause interferences. Don’t transmit if the status LED is glowing

green or amber. Wait till nobody is transmitting on the channel.

English

ISTR106_int 26-09-2003 9:47 Pagina 11

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