[Elecraft] K3 audio line out level with blue tooth hearing aid amp

[K7JLTextra]

I got a boost of 15dB on my hearing aids and it works great with the rear K3 connector 

John Hendricks K7JLT

On Jan 3, 2014, at 10:52, Robert G Strickland <rcrgs at verizon.net> wrote:

> Happy New Year, Don...
> 
> Using audio out from the rear speaker jack is the same as the front headphone jack: low audio which becomes distorted as the gain from either the radio or the BT transmitter is increased. I'm thinking that this might be a limitation in the hearing aids. I haven't checked with the hearing aid people about increasing the gain of the hearing aids in the BT mode. That's worth a try. I'll report back.
> 
> ...robert
> 
> On 1/3/2014 16:55, Don Wilhelm wrote:
>> Robert,
>> 
>> What happens if you plug the Bluetooth transmitter into the speaker jack
>> on the rear panel?  It is worth a try.
>> 
>> 73,
>> Don W3FPR
>> 
>> On 1/3/2014 10:42 AM, Robert G Strickland wrote:
>>> Thanks for the comments.
>>> 
>>> Using the LINE OUT at a fixed level - whatever that might be - does
>>> not allow volume control from the front panel AF/RF knobs. With this
>>> setup the only volume control is on the blue tooth transmitter which
>>> does not allow fine and immediate control as the operating environment
>>> changes.
>>> 
>>> With LINE OUT set to PHONES, the output level is controlled from the
>>> front panel which is desirable. However, as stated in my original
>>> post, there is no AF/RF setting that delivers enough <signal> volume,
>>> regardless of the volume setting on the blue tooth transmitter.
>>> However, while the signal level is way down, the radio control beeps
>>> are at their normal volume suggesting that some adjustment/switch is
>>> incorrect. What might this adjustment/switch be?
>>> 
>>> The other issue is that sound out of the front panel audio jack, while
>>> loud and controllable, is very distorted as heard via the blue tooth
>>> transmitter. This may be because of an impedance mismatch; I don't
>>> know right off what the input impedance of the blue tooth unit is.
>>> Another reason may be a very limited dynamic range in the blue tooth
>>> unit.
>>> 
>>> The blue tooth transmitter does work as advertised when used as
>>> intended: enhancing speech levels in a natural environment. This agan
>>> suggests that impedance matching and/or dynamic range may be the
>>> issue(s), at least when using the K3's front panel audio jack.
>>> 
>>> ...robert
>>> 
>> 
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> 
> -- 
> Robert G Strickland, PhD ABPH - KE2WY
> rcrgs at verizon.net.usa
> Syracuse, New York, USA
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