JT65 audio noise

[Peter Pauly]

1. On my K3S I'm getting audio noise over the USB connection in the upper
part of every band as shown on the WSJT-X JT65 graph. The WARC bands seem
to be shifted. I am using the 6K AM filter. Any idea what is causing this?
This has to be affecting the ability to decode weak signals.  The noise is
present even when connected to a dummy load. Here's a picture of what it
looks like on several bands:

http://imgur.com/8c2ds2q


2. Is there any way to increase my filter bandwidth to be wider than 4K?
Shouldn't I be able to get 6K with the AM filter?

Thanks
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[N3XX]

Do you have "Flatten" checked in the Wide Graph window?  If so, try
unchecking it.

73,
Tim - N3XX

On 10/23/2015 7:15 AM, Peter Pauly wrote:

> 1. On my K3S I'm getting audio noise over the USB connection in the upper
> part of every band as shown on the WSJT-X JT65 graph. The WARC bands seem
> to be shifted. I am using the 6K AM filter. Any idea what is causing this?
> This has to be affecting the ability to decode weak signals.  The noise is
> present even when connected to a dummy load. Here's a picture of what it
> looks like on several bands:
>
> http://imgur.com/8c2ds2q
>
>
> 2. Is there any way to increase my filter bandwidth to be wider than 4K?
> Shouldn't I be able to get 6K with the AM filter?
>
> Thanks
> ______________________________________________________________
> 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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[Lyle Johnson]

The DSP code in the K3 and K3S limits the audio bandwidth to about 4.2
kHz, and that won't be changing in any significant way.

73,

Lyle KK7P
> 2. Is there any way to increase my filter bandwidth to be wider than 4K?
> Shouldn't I be able to get 6K with the AM filter?

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[k5oai]

use the Lo <--CUT --> Hi to expand the bandwidth to 0 or 100 on the low end and 4000 or 4100 on the top end. I set this up in the II setting so I can return to it easily. Once you have set it up it should stay in memory the next time you are in DATA on that band. Although sometimes I find I have to reset it if it forgets my settings for some unknown reason.

also if you are using WSJT-X remember to use Split so you can Respond to both JT65 & JT9 signals.

73 & GB
Sam
K5OAI