I have a Radioddity GM-30. My buddy has a Retevis RTT-22. I can hear the RTT-22 transmit on the GM-30. But, he cannot hear the GM-30 transmit to the RTT-22. I found online the freq lists for the RTT-22, and tried programming the GM-30, but to no avail.
Any help or suggestions would be truly appreciated!
Cheers!