GMRS scramble

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GMRS scramble

Post by kerr » Thu May 01, 2008 1:01 am

I found that my rhino 530 has a scramble mode on it and it makes the transmission sound digital on a radio that isn’t scrambled. I believe this to be “CTCSS”. There seems to be a few other types of scrambling types out there. Is there one that prevents others from walking on your transmission. Sort like a filter. Making radios that have that particular encryption the only ones able to talk to each other?
Amateurs train to get it right; professionals train to never get it wrong.

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Post by n9gik » Thu May 01, 2008 11:30 pm

Rather than rewrite stuff, here is some info from Wikipedia on CTCSS (from :

In telecommunications, Continuous Tone-Coded Squelch System or CTCSS is a circuit that is used to reduce the annoyance of listening to other users on a shared two-way radio communications channel. Where more than one user group is on the same channel, (called co-channel users,) CTCSS filters out other users if they are using a different CTCSS tone or no CTCSS.

Instead of turning on the receive audio for any signal, the two-way radio receiver's audio turns on only in the presence of the correct tone. This is akin to the use of a lock on a door. A carrier squelch or noise squelch receiver is unlocked and will let any signal in. A receiver with CTCSS locks out all signals except ones encoded with the correct tone.

So no, what you are hearing is not CTCCS. It may very well be a scrambler, and it may require CTCSS to work.
I don't know much about 2-way radios but I'm over 50 and can't remember not having one around. Everything from Buddy and Citi-fone to Icom and Kenwood.

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Re: GMRS scramble

Post by ohgary » Fri May 02, 2008 7:22 pm

Your rhino doesnt have any scramble capability. It does have digital squelch, this does affect the audio.

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