Quote Originally Posted by rwanttaja View Post
Don't know about "safety"; seems to me that few folks flying an open-cockpit plane really need any sort of electronic devices to ensure their safety.



They have ~25 dB of attenuation, about the same as a headset. You would need a simple impedance matcher to use them on a standard aircraft radio, but they're just fine on a handheld with 8-ohm output. They fit easily under the helmet.

Ron Wanttaja
By "safety" I mean:

If you are flying around and you depend upon your receivers to work, then it can be a safety issue if 70 year old receivers should conk out - and maybe you don't discover that immediately.

Is such an impedance matcher commercially available?