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tone squelch on Icom radio ??

merlin

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Jul 3, 2003
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lasvegas,nv.
What exactly is 'C-TONE' squelch. I programmed a radio to use on a repeater and of 16 channels, I can't tell what the relation is with CTCSS.
Some of these tone codes don't correlate to frequency IE: 311N,,754N.
Is there a standard list of these codes ? In the programming software this is a default but you can select the standardized CTCSS tones.
Seems exclusive to Icom radio. I know of a system that eliminates the squelch tail at TX end, is this it ?
 
Last edited:

kayn1n32008

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311N and 754N are not CTCSS tones, they are DCS codes. It’s a completely different type of access control but does the same thing as CTCSS.
 

mmckenna

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Been a while since I programmed any Icom gear, but if I recall correctly, C-tone is there name for CTCSS. In the drop down menu, you should see not only the list of standard 38 EIA CTCSS frequencies, but also several of the non-standard tones.

As K said, the 311N and 754N are DCS codes. The "N" is for "Normal" polarization and there will be some shown with an "I" for Inverted.
 

merlin

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Jul 3, 2003
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lasvegas,nv.
OK people, I know the CTCSS and the DTS, just didn't know that C-tone was the DTS. I suspected but wanted clarification.
Yea, there is both programming a radio along with the non-standards.
Thanks.
 
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