[Elecraft] 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