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75-440 User manual
Page.
13
Channel selection
Each channel is identified by 2 numeric digits. The FCC assigned GMRS channel frequencies are
programmed into your radio as shown in the table below. Channels 1 through 7 are shared with FRS
radios.
Channel
(FRS Ch.)
Freq. MHz. Channel Freq. MHz.
Channel
(Duplex)
Freq. MHz.
Tx/Rx
1 462.5625 8 462.5750 16 467/462.5750
2 462.5875 9 462.6250 17 467/462.6250
3 462.6125 10 * 462.6750 18 467/462.6750
4 462.6375 11 462.5500 19 467/462.5500
5 462.6625 12 462.6000 20 467/462.6000
6 462.6875 13 462.6500 21 467/462.6500
7 462.7125 14 462.7000 22 467/462.7000
15 462.7250 23 467/462.7250
* GMRS Emergency Channel (10) 462.675 MHz.
To select a channel:
1) Press the
key to increase the channel number or the key to decrease it.
Receiving
Your radio can be programmed to work, channel by channel, in “Open traffic” or “GROUP MODE
(CTCSS/DCS)”. Group mode prevents other users of a channel from being heard on your radio. See
“Setting Group Mode Codes” for programming instructions.
• OPEN TRAFFIC: in this case you will hear all communication which will be transmitted on the
selected channel. When a message is received your squelch will un-mute, you will see the status LED
glowing green and you will hear the message.
• GROUP MODE:
• CTCSS/DCS (Continuous Tone Code Squelch System / Digital Coded Squelch): are systems
which use particular TX signaling as an access “key” to work a repeater (encoder) or to unlock the
party’s signaling sensitive squelch. This last condition allows more radio networks to share the
same frequency. In this case you will receive only messages coming from parties sending a
proper TX signaling. During “CTCSS/DCS” operation, the radio may be set-up so that the
appropriate CTCSS/DCS decoder enables the speaker.
, CTCSS/DCS If more than one station is transmitting at the same time, this will cause
interference! Do not transmit if the status LED is glowing. Wait until the channel is clear before
transmitting.
Monitor Button
The Monitor button can enable or disable “GROUP MODE (CTCSS/DCS)” if programmed for that channel.
1) To enable “GROUP MODE”. Press and release the“MON” button: “SAT” icon is displayed. A Sub
Audible Tone mutes your speaker.