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.


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.)

| improve this answer | |
  • $\begingroup$ 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

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.


| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.