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1  Do you make a mult-charger for the rt21 radios?
Hello TIMOTHY, RT21 hasn't mult-charger, so sorry for that, will take your demand to our developer If it will appear, will timely contact you, Thanks for your support Brgds
2  I get a error when installing my RT21 software "Component 'Msconctl.ocx did not corrertly register. Is there a path for this? I am running window 10 64 bit os
Dear Marc, Please download RT21 USB driver and software by this link http://www.retevis.com/resources-center Then follow the blog to check installation questions http://blog.retevis.com/shall-can-not-programming-radio/ Best regards
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   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
5  What is the maximum range to receive and send a signal for the RT21?
Dear Tim, The range is changeable based on communication environment If it used on sea, the range around 5-10km if it used on city, the range around 1-3km As we know, the range affected kinds of factors, like power, height, environment and so on Best regards
6  Hi, I bought 2 x RT21 units and re-programmed them & love them. Then a friend bought another 2x... but we having trouble programming one unit. It is constantly giving me a "Runtime error 6 overflow" when i try and read the handset using the rt21.exe I have done nothing different with this unit. Can you please help. Thanks Damien (in Australia)
Dea Damien, Here's a blog for you reference‘What shall we do when can not programming radio?’ http://blog.retevis.com/shall-can-not-programming-radio/ Bes regards
7  Can I bay additional batteries for RT21 with micro usb ports (Like TR21 with Car USB Charger option)?
Hello Dmitriy, Could you tell me your shipping address? let us check if can send pure battery to your country Best regards
8  I just bought a bunch of RT21 radios. How do i get them to work with my older H777 radios?
Dear Dave, Here's a blog for you reference: how to make two analog take with each other http://blog.retevis.com/programme-retevis-rt24-communicate-retevis-rt5r/ Best regards
9  Buenas tardes, Acabo de comprar 4 emisoras RT21 y quisiera saber con que potencia, frecuencias y canales CCTS/DCS vienen programas de serie. Gracias
Hello Rafael, We will send email to you, pls notice check it, thanks Brgds
10  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