Welcome to Retevis Support
We’re here to help.
Search for your question here and get answers. If not you can start a new problem.
1  I purchased 5 rt21 radio's and the disk to program them with the cable; but it does not work with windows 10. can you send me a link to the correct software?
Please download RT21 usb driver and RT21 software from Retevis official website: http://www.retevis.com/resources-center/ Attached a photo for you reference:
2  Hello I have RT21, is a good radio but i have problema. I can not programming this frequency 446.00625 446.01875 446.03125 Help
please confirm if you "write to radio'' in RT21 software, attached a pic for you reference
3  Hello Where can I download the programming software for the RT21 and RT81? Thanks and Greetings Stephan
A blog about how to program radios : http://blog.retevis.com/retevis-radio-frequency-programming/
4  Is the rt21 compatible with h777? My coworkers have the h777s but I want the rt21.
Yes, RT21 can compatible with H777, Under frequency and CTCSS is same, they are communicate with each other Could you tell me how many do you need? we can provide a discount price for you
5  Is there a way to get the radio to beep when you press the transmit button and when you receive call?
Hello Robert, RT21 radio hasn't beep function, so sorry for that, Thanks for your suggestion, we will update it Brgds
6   i cannot get any transmission in or out when i turn the radio on it informs me of the channel then the red light comes on
Hello Kevin, If two radios can communicate with each other, keep the frequency and CTCSS same, so pls check your frequency and CTCC if it's same Brgds
7  After the download the software for RT21 shows error message and can not be used. With RT1 and H777 everything is OK. Need a solution otherwise i have to return the equipment to the seller. Greeting Ralf
Any pictures to show the error ? Or you could try to program by Chirp -- http://chirp.danplanet.com/projects/chirp/wiki/Home