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Midland Alan HP106 Manual

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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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