What is the difference between Icom's C-Tone and R-Tone?

[James86004]

The manual on my Icon T-90A is not very illuminating about the difference. This is all it says:

Setting subaudible tones for
repeater or tone squelch
Push [8 SET] for 1 sec. to enter set
mode.
Rotate [DIAL] until “R TONE” (repeater
tone) or “C TONE” (CTCSS
tone) appears.
Push [8 SET].
Rotate [DIAL] to select the desired
repeater or CTCSS tone.

 

[gary in ohio]

The Icom support both CTCSS (repeater tones,pl,guard channel) and DCS, I think icom calls that DTCS. Most repeaters use CTCSS

 

[SilverBullet]

The R-tone is a receive tone. In lots of areas, there is interfearance from foreign sources. We have this in Big Bear, or used to when I lived there. The repeater then will transmit an outgoing pre-tone an dusers can set their radio to only play sounds containing those tones. If you turn that on by accident and a repeater is not using it, you will not hear anything.

At least, that is how my Icom is.

 

[James86004]

Thanks for you replies so far. I have got it to work in that I can talk to people on the Eastern Arizona Amateur Radio Society's repeaters, but I still am trying to figure out what all the other settings are for. A rather snooty guy I asked on the repeater told me to go back and study for my license again, but believe me, there were no questions in this level of detail on the Tech or General exams.

There are settings for:
R-Tone
C-Tone
DTCS Code for DTCS Squelch or Beep

Then, I can press a button marked "Tone" and it cycles through the following settings:

Subaudible tone encoder “T”
Tone squelch “T SQL”
Pocket beep “T SQLS *”
DTCS squelch “DTCS”
DTCS beep “SDTCS”
No tone operation

In particular, what is the difference between the "T" and "T SQL" settings?