I have seen similar caused by DSP in receivers if possible try turning off the
DSP this may disappear.
73 Morris WA4MIT
On Monday, May 18, 2020, 07:47:32 PM CDT, Bill Somerville
<g4...@classdesign.com> wrote:
On 19/05/2020 01:10, Dave K1SX wrote:
> Hi,
> Please pardon this one if it proves to be my own setup, but I have not seen
> this sort of thing in a great deal of previous wsjt-x operating.
>
> Note that for several cycles of reception the 100 hz barred pattern in the
> spectrum. I caught this on an empty 6m band, but I've seen it on crowded HF
> bands too and it's associated with a smearing of displayed traces and (I
> believe) reduced decodes.
>
> Note that it is definitely a 100 hz, not a 120 hz pattern (I'm in 60 hz line
> freq land). The receive power is zero bcz I turned off Monitor to take the
> screenshot. It was at 40db when running.
>
> Note also that it corrects itself abruptly at a cycle boundary.
>
> Setup: Genesis sound-card based SDR using a version of PSDR software, Mac
> Mini native audio, Win 7 under Parallels virtual machine, Muzychenko VAC
> 4.62, all set to 48k sample rate as I have done for many versions back. No
> noise blanker or other stuff active.
>
> If you tell me it's my own issue, I'm happy enough!
>
> Dave K1SX
Hi Dave,
open the VAC control panel and check if any under-runs or over-runs are
being reported. Also check if you have the latest version of VAC.
73
Bill
G4WJS.
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