Thats actually the very interesting bit...it is a general air to air frequency, 126.325, and the problem is present whenever one of the radios are tuned into that freq. Yes they are the same make and model comm sets. Somebody else mentioned that problem to me today, but said its only when in a certain part of the country, so i guess there might be some interferance from an external source somewhere, cause afghanistan must be humming from all the radio and who knows what kinds of transmissions filling the airwaves.