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1   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
2  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
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/