Search found 7 matches
- Fri Jun 19, 2020 1:54 pm
- Forum: Digital ("Virtual") Audio
- Topic: Optimizing WSJT-X
- Replies: 7
- Views: 5721
Re: Optimizing WSJT-X
Running PowerSDR, Scott.
- Thu Jun 18, 2020 11:20 pm
- Forum: Digital ("Virtual") Audio
- Topic: Optimizing WSJT-X
- Replies: 7
- Views: 5721
Optimizing WSJT-X
I don't think that I am decoding some signals on FT8 that I should be able to. The basic system configuration works, and I am making quite a few contacts. But there are a lot of DX stations that my neighbors are copying that do not decode for me, and sometimes I will see a 15 second period with half...
- Mon Jun 08, 2020 7:34 pm
- Forum: PowerSDR mRX
- Topic: Resampler Adjustment
- Replies: 39
- Views: 108094
Re: Resampler Adjustment
A while ago I posted a topic about "ghost" decodes I was seeing on FT-8 with WSJT-X (see https://apache-labs.com/community/viewtopic.php?f=6&t=3431&p=11398#p11398). Today, I was finally able to pin down the cause, and it is the rational resampler. Attached is a shot of the WSJT-X w...
- Mon Jun 08, 2020 7:24 pm
- Forum: PowerSDR mRX
- Topic: WSJT-X FT8 signal images
- Replies: 21
- Views: 11952
Re: WSJT-X FT8 signal images
Nigel, what you described is definitely part of what I was seeing. This afternoon I was able to nail down what's going on, though perhaps not quite why. The spurs, as well as a frequency wobble, are caused by the rational resampler. See the attached shot which shows a stable, unmodulated carrier at ...
- Tue May 26, 2020 6:31 pm
- Forum: PowerSDR mRX
- Topic: WSJT-X FT8 signal images
- Replies: 21
- Views: 11952
Re: WSJT-X FT8 signal images
I am pretty sure this is *not* what some people are seeing in their PowerSDR panadapter windows. I do not see obvious signs of spurs there when my problem is occurring (though I have certainly seen bad transmitted signals there!). What I am reporting is visible in the WSTJ-X waterfall display and al...
- Sun May 24, 2020 5:18 pm
- Forum: PowerSDR mRX
- Topic: WSJT-X FT8 signal images
- Replies: 21
- Views: 11952
Re: WSJT-X FT8 signal images
Wow, I didn't realize my post would generate this many comments! I think I resolved the problem, though I'm not certain just what did it. The ghosts i saw were *not* in the PowerSDR panadapter window, but in the WSJT-X window, and were basically duplicates of the strong signal spaced at 100 Hz inter...
- Fri May 22, 2020 8:53 pm
- Forum: PowerSDR mRX
- Topic: WSJT-X FT8 signal images
- Replies: 21
- Views: 11952
WSJT-X FT8 signal images
I am running an ANAN-7000DLE with PowerSDR mRX 3.4.9 and WSJT-X 2.1.0 using Virtual Audio Cable under Windows 10. Recently I am plagued with spurious images of any moderately strong signal on FT8 (say, 0 dB or better) where I get "ghost" signals and decodes spaced +/- 100 Hz from the main ...