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
rc...@verizon.net.usa
Syracuse, New York, USA
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