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1  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/
2  Hello. Sorry for my bad English. I recently buy two RT7 and H-777. Where is the programming software for model RT7 y H-777. Thanks
Here is the link : http://www.retevis.com/resources-center/
3  Is there a set list of frequencies that the radios operate on or can they be programmed to any UHF Part 90 frequencies
Yes ,it could be set to any UHF Part 90 frequencies . And any of frequencies that between 400-470MHz
4  Dear Retevis Team, I love your Digital Radios very much. After I´ve got my RT3 i bought another RT8 too. With the RT8 i have a Problem: Sometimes it Shows the Volume changing bar without touching the Volume knob. Software: S013.032 CP V01.32 My Question: Is it a Software Bug or a Hardware defect? 73´s DL8BJ
It may the trouble of potentiometer inside the radio , if you can not fix it by yourself , please find your seller to help send back to factory to repair .
5  How can I set the power to low in the repeater mode
For better communication , we only set high power when in the repeater mode , may I ask why you want to set it to low power ? Do you use it this way frequently ? If so ,we could consider to add it on later production .
Contact mail address -- email@example.com
6  having trouble programming radios we just purchased. Please help..
About what kind of settings ? Frequency ? or any other functions ?
There is a blog about programming radios , it may helps : http://blog.retevis.com/retevis-radio-frequency-programming/
7  Can not get H 777 software to install on system. windows 10
I'm sorry but could you try it on win8 please ?
8  Where can I find programming software for RT1?
New page is done , here is the software link , all could be downloaded here : http://www.retevis.com/resources-center/
9  How do I program my new H-777 walkie talkie and is it necessary to do so? The squelch volume is too loud when interference is taking place. How do I adjust the volume?
You need to connect your radio to PC by cable , How to program it on software please read the guide here : http://blog.retevis.com/retevis-radio-frequency-programming/ . Then when you open the software , you will see just like the picture below -- There you could find the squelch levels , that's the function you need to set .And please note --
1. The higher the number is , and the stronger the ability of noise suppression is . But meanwhile it has less probability to receive the weak signal.
2. Conversely, The smaller the number is , the weaker the ability of noise suppression is , But meanwhile it is more easily to receive the weak signal.
3. A "0" level indicates that there is no squelch suppression function, which is the lowest level.
10  Where do we register the products for warranty?
If order on www.retevis.com,we have one year warranty . Others please contact your seller to learn .