[Elecraft] Heil Pro 7 headset with KX3 - RF feedback?

[Jim Brown]

On 6/18/2021 11:34 AM, Ed Cole wrote:
> I wear hearing aids and the CM500 immediately set up a loud howl the 
> minute I put them on (even with not being plugged into the radio).  
> Apparently my hearing  aid gain is so high the CM500 provided feedback 
> to the hearing aid mics - I have two with my OTE (over the ear) hearing 
> aids.

That's acoustic interaction of the earphones with your aids, and depends 
on the placement of the mics in the aids. Mics for the aids are picking 
up their own amplified sound, because the acoustic space around the ear 
is modified by the presence of the earphones. In sound systems, we call 
that feedback. It makes sense that different headphones would interact 
differently with aids, depending on the construction of both.

My XYL uses aids where the mics are outside the ear. She doesn't use 
headphones when she's wearing them.

73, Jim K9YC