How to programme RT21?

How to programme RT21?
Retevis RT21 is a hot selling model, elegant, economical price, with scramber function to make your conversation more confidential.

Now let’s go to business, do you know how to programme RT21 when you get a new radio at hand?

Same Retevis radio model no. is with same default settings.
For new RT21, just switch the new radios in same channel, they can communicate directly.

Programme RT21 when you need make some changes:

Step:1 Please download and install RT21 USB driver (USB Universal Driver) in RETEVIS official website
Step 2: You need a programming cable C9018A
Step 3: Connect your RT21 with you PC, using programming cable.
Step 4: Turn on the radio RT21.
Step 5: Now we come to RT21 software interface

Step 6: Choose the correct communication port
(check in computer-device manager)
Step 7: Click” Read from Radio” in “Program” Column
Step 8: Write the date, such as “RX frequency”, “TX frequency” CTC/DCS DEC and CTC/DCS ENC in to the channels

For example:
RX frequency:452.12500
CTC/DCS DEC: 69.30
TX frequency 452.12500
CTC/DCS ENC: 69.30

Finally Step 9: Click “Write to Radio”. Then all datas will be saved to radio.

Need know more about RT21? Please feel feel to write to us, thanks!

12 thoughts on “How to programme RT21?

  1. Hello,
    When I Click on “read from radio”, it asks me for a password… what is the password for the RT21 ?
    Thanks for your answer.

  2. How can I receive transmission from Retevis RT-5R to Retevis R21 model? I tried programming and all I can do is receive on RT-5R from R21 transmission.

  3. I also was trying to program our RT21, and I am also getting a password request. I have a cable, not yours, but need to purchase one. Where can I buy one?

  4. Need assistance in programming emergency alarm into rt21. Also, what is the password for the them as it asked for one when trying to read from the radio?

    1. hello, just use the sidekey as the alarm key you can active this function.
      Open the software: Edit-Key setting-Alarming
      then write to radio.
      If any, please feel free to contact us!
      Best regards

  5. Hello,

    I am trying to reset the channels on my RT21 radios. The programming software seems to find the correct com and the radio is on, however when I press ‘read from radio’, it returns me the error ‘Check connection! Retry or cancel?’. Also it asks for a password which I am not aware of. How should I proceed?

    Thanks in advance!

    1. hi, if you meet the error ‘Check connection! Retry or cancel? please check all your connnections are tightly, make sure the port is right, the radio is power on.
      And for the password,please check if you set one or not, you can try to ingore the password just click ok to continue.

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