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

[Ed Cole]

My hearing aids have blue tooth but require an interface to use it with 
my iphone.  The interface is a wireless remote control for the hearing 
aids and came with a very small thing that plugs into audio sources via 
a mini-phone plug.  That sends the sound via BT to the remote and on to 
my hearing aids.  Haven't used it much but that might work better than a 
headset.  I didn't note any latency.

I have a K3, KX3, and new IC9700 which all provide ext audio. The issue 
for lengthy use is the remote rechargeable battery life is short (maybe 
two hours).

Note to Jim:  Yes I realize its audio feedback in the CM500. Have no 
problem using my Sony MVR-V600 headphones or my Bose noise-cancelling 
headset.  Suggestion that I wear headphones without hearing aids does 
not work for me.  Hearing loss is not just a factor of amplitude (I 
cannot hear tones above 4-KHz). Loss is >100 dB.  My hearing aids 
provide 22 channel digital processing and I still need closed captioning 
watching TV.

Digital modes are best for doing weak-signal ham radio as I can see the 
computer FB.

Ed - KL7UW

> Message: 7
> Date: Fri, 18 Jun 2021 12:04:25 -0700
> From: Rick NK7I <rick.nk7i at gmail.com>
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] Heil Pro 7 headset with KX3 - RF feedback?
> Message-ID: <21dc0253-acd8-71a6-e9aa-4341a183cd6a at gmail.com>
> Content-Type: text/plain; charset=utf-8; format=flowed
>
> Slight topic change, apologies.
>
> Has anyone used rx audio via Bluetooth into their hearing aids? Any issues?
>
> I was hoping the K4 would have BT audio, but it doesn't.? So the next
> best option would be to send the sound card audio to BT in a computer,
> linked to the aids or headset...? I don't have my K4 yet, so it's a guess.
>
> 73,
> Rick NK7I
>
>
> On 6/18/2021 11:58 AM, Jim Brown wrote:
>> 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
>>