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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