K3S subreceiver sound "problem"

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K3S subreceiver sound "problem"

Elecraft mailing list
I put "problem" in quotes because it's not clear where the "problem" is:
me or the radio.

I recently purchased an Elecraft assembled and tested K3S with a
subreceiver and its own 400cps filter. The main receiver has the
following filters: 2.8, 1.9, 500 & 200. When I listen to both receivers
through good quality headphones, the subreceiver sounds muffled, dull,
maybe a bit less volume when the gain and audio settings are identical,
all the while the main receiver is crisp and clear. Reversing the head
phones reverses the effect which, I think, rules out my hearing and
hearing aids.  Reversing things with the A/B switch makes the left
channel muffled and dull. I've tried a whole lot of different setup
parameters, read the manual and Cady's book carefully, but I can't come
up with anything the brightens up the subreceiver. Any suggestions?
Thanks.

...robert
--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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Re: K3S subreceiver sound "problem"

Lyle Johnson
Is the "dull and muffled" only with the 400 Hz filter?  Does the Subrx
have any other filters?

If it is just the 400 Hz filter with the problem, it may be that the
filter offset is not set correctly.

73,

Lyle KK7P

On 7/1/19 5:02 PM, Robert G Strickland via Elecraft wrote:

> I put "problem" in quotes because it's not clear where the "problem"
> is: me or the radio.
>
> I recently purchased an Elecraft assembled and tested K3S with a
> subreceiver and its own 400cps filter. The main receiver has the
> following filters: 2.8, 1.9, 500 & 200. When I listen to both
> receivers through good quality headphones, the subreceiver sounds
> muffled, dull, maybe a bit less volume when the gain and audio
> settings are identical, all the while the main receiver is crisp and
> clear. Reversing the head phones reverses the effect which, I think,
> rules out my hearing and hearing aids.  Reversing things with the A/B
> switch makes the left channel muffled and dull. I've tried a whole lot
> of different setup parameters, read the manual and Cady's book
> carefully, but I can't come up with anything the brightens up the
> subreceiver. Any suggestions?
> Thanks.
>
> ...robert
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Re: K3S subreceiver sound "problem"

Elecraft mailing list
In reply to this post by Elecraft mailing list
Thanks for the suggestions.
The subreceiver is on MAIN.
I set the selectivity for about 2kx in both receivers so that they are
both using the basic SSB filters, ie no 400cps filter in the sub-. I
re-checked all signal processing switches [ie, NR, NB, ATN, etc] to make
sure they were the same. I set both receivers to the same frequency,
both band noise and signals. I checked the rcv equalization; I don't
think that the two receivers can be set up with different profiles, at
least I couldn't do it. I turned off my hearing aids [the audio
parameters of my hearing in both ears are pretty closely matched]. So,
slightly better suggesting that some of the dullness was mismatched
setup. However, the sub- is still duller than the main. It's like the
there's a high freq cut on the sub-. In some respects it sounds like
there's some audio distortion through the sub- that's not there in the
main. That's it for the moment.

...robert

On 7/2/2019 00:02, Robert G Strickland via Elecraft wrote:

> I put "problem" in quotes because it's not clear where the "problem" is:
> me or the radio.
>
> I recently purchased an Elecraft assembled and tested K3S with a
> subreceiver and its own 400cps filter. The main receiver has the
> following filters: 2.8, 1.9, 500 & 200. When I listen to both receivers
> through good quality headphones, the subreceiver sounds muffled, dull,
> maybe a bit less volume when the gain and audio settings are identical,
> all the while the main receiver is crisp and clear. Reversing the head
> phones reverses the effect which, I think, rules out my hearing and
> hearing aids.  Reversing things with the A/B switch makes the left
> channel muffled and dull. I've tried a whole lot of different setup
> parameters, read the manual and Cady's book carefully, but I can't come
> up with anything the brightens up the subreceiver. Any suggestions?
> Thanks.
>
> ..robert

--
Robert G Strickland, PhD ABPH - KE2WY
[hidden email]
Syracuse, New York, USA
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Help: http://mailman.qth.net/mmfaq.htm
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Re: K3S subreceiver sound "problem"

Victor Rosenthal 4X6GP
In reply to this post by Elecraft mailing list
If the a/b switch causes the problem to move, then it is something connected to bandwidth (etc.) settings and not a hardware issue with the subrx. The a/b switch doesn’t change which receiver goes to which ear (etc.)

Victor 4X6GP

> On 2 Jul 2019, at 3:02, Robert G Strickland via Elecraft <[hidden email]> wrote:
>
> I put "problem" in quotes because it's not clear where the "problem" is: me or the radio.
>
> I recently purchased an Elecraft assembled and tested K3S with a subreceiver and its own 400cps filter. The main receiver has the following filters: 2.8, 1.9, 500 & 200. When I listen to both receivers through good quality headphones, the subreceiver sounds muffled, dull, maybe a bit less volume when the gain and audio settings are identical, all the while the main receiver is crisp and clear. Reversing the head phones reverses the effect which, I think, rules out my hearing and hearing aids.  Reversing things with the A/B switch makes the left channel muffled and dull. I've tried a whole lot of different setup parameters, read the manual and Cady's book carefully, but I can't come up with anything the brightens up the subreceiver. Any suggestions?
> Thanks.
>
> ...robert
> --
> Robert G Strickland, PhD ABPH - KE2WY
> [hidden email]
> Syracuse, New York, USA
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
______________________________________________________________
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Help: http://mailman.qth.net/mmfaq.htm
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