GME TX3500S - Manual (Page 14)

PA G E 1 4 I N S T R U C T I O N M A N UA L T X 3 5 0 0 S
• If the icon is not visible above the channel display,
the selected channel is not in the Net-Scan memory. To add
it, hold the SCAN key until a high beep is heard.
will
appear to confirm the channel is now in memory.
Repeat to add or remove further Net-Scan channels.
IMPORTANT: When adding channels to Net-Scan, please
consider the following:
• The transmitter on your radio is inhibited on channels 22,
23 and channels 61, 62, 63 as required by the ACMA.
This makes these channels unsuitable for use as Net-Scan
channels.
• You should not include any repeater channels unless you
have confirmed that the channel is not allocated to a
repeater in your area. If you add an active repeater channel
into your Net-Scan, you or others in your Net-Scan group
may cause interference to other repeater users on that
channel.
Starting Net-Scan
With Net-Scan mode enabled, press SCAN. A high beep will
be heard and the
icon will animate. During this time
the channel numbers will change rapidly as the channels are
scanned
Using Net-Scan
When a member of the group initiates a transmission their
radio will automatically select a clear channel to transmit on.
Other radios scanning in the same Net-Scan group will locate
the transmission by identifying the groups CTCSS/DCS code
and open their squelch allowing the transmission to be heard
across the entire group. When the transmission ends, all
radios in the group will immediately resume scanning.
If a member of the group responds to the initial transmission,
they will automatically re-use the same channel as long
as the channel remains free of other signals. This allows
the radios in the group to respond more quickly to further
transmissions from others in the group.
If at any time, a signal from outside your Net-Scan group
appears on the channel (either with no code or the wrong
code), the channel will be discarded and a new clear channel
will be selected at the next transmission. The other radios
in the group will then locate the new channel allowing the
conversation to continue seamlessly without any input from
the user.
Ending the scan
To stop scanning, briefly press the SCAN key. A low beep
will be heard and the animated
icon will stop. As long
as the radio was not on a busy channel, it will return to the
last channel you selected, otherwise it will stay on the busy
channel.
CTCSS & DCS
The standard squelch system is fine for quieting the radio
in most applications. However, it operates solely on signal
strength which means that it will always open to any signal
that is strong enough. If the channel is busy with other
stations the squelch will be constantly opening making it
difficult to determine which calls are meant for you.
CTCSS (Continuous Tone Coded Squelch System) and DCS
(Digital Coded Squelch) are similar squelch quieting systems
that provide selective audio muting using sub-audible
signalling. When enabled, only signals with a matching
sub-tone will be heard in the speaker. This effectively creates
a channel that is silent to all traffic except those you wish
to hear.
Choosing CTCSS or DCS
The CTCSS system uses 1 of 50 low frequency tones to open
and close the squelch on the radio. The DCS system is similar
to CTCSS but uses 1 of 104 digital codes to control the
squelch. There is no difference in performance or function
between the different tone sets so choosing which tone
system to use will largely depend on the other radios you talk
with. If others already use CTCSS or DCS, you should select
the tone system that matches theirs. If the users you talk to
don’t currently use CTCSS or DCS then you can make your
own choice. Both types are included in the radio to maintain
compatibility with other radio systems.
CTCSS Tone set compatibility
The GME CTCSS tone set comprises a table of 50 tones made
up of the standard CCIR-38 Tone Set plus an additional 12
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