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I need to disable or block the side key moni(monitor) so others can't hear on my private CTS DTS. I use a Baofeng UV-5R and a UV-82. Another team that uses the same repeater, but has different CTS DTS codes, can hear when I press the side key moni.

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Don't bother.

CTCSS tones are not an effective privacy mechanism. Anyone at all with a FM two-way radio or scanner can receive your transmissions; attempting to prevent this by locking down your radios gives you only the illusion of privacy.

(P.S. This site is for Amateur Radio, and I'm guessing you're actually a commercial radio user. I'm answering your question anyway because I think it's close enough to being about the technology in general and Baofeng radios are commonly used by amateur license holders as well.)

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  • $\begingroup$ I totally agree with @Kevin, and would only add that the only way to disable it would be to take an X-acto knife and cut off the rubber part. But then there goes any kind of water resistance. So I echo: Don't bother. $\endgroup$ – SDsolar May 24 '17 at 20:55
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CTCSS tones or DTS digital tones, are only for "Receiving intended signals".

If a receiver is configured to receive on a frequency with CTCSS or DTS, then the squelch is only opening when the transmitted signal contains the "matching" CTCSS or DTS.

If a signal is transmitted without the "matching" CTCSS or DTS, then the receiver's squelch will not open, and you will not hear the signal.

However, if a receiver is configured on a frequency without CTCSS or DTS, then it will receive all signals, including those which have CTCSS or DTS, and the squelch will open.

So, if you are communicating on a frequency with many many users, you can transmit with CTCSS/DTS, and receive with the same CTCSS/DTS, and you will only hear these signals....

However, everyone else; with receivers configured without CTCSS/DTS... will also hear your transmitted signal!

This is why it is a "false/illusion of privacy" as answered already.

Use CTCSS/DTS only if you want to restrict a receiver to a specific transmitted signal, with the understanding that others can perfectly receive your signal.

HTH.

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