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Hello,
I have attached three screenshots to this mail, I hope they will
be displayed or delivered to your mailbox. As Mike mentioned
before: after some fiddling around I was able to get Digi-U
working with VAC (but still with a loss of few signals which were
decoded by SparkSDR but not in WSJT-X).
The signals displayed in the WSJT-X waterfall as well as the number of signals decoded is very much depending if AGC is switched on or off. With AGC ON the decoding there are many more signals displayed on the WSJT-X waterfall but also some noise between 0 and about 450 Hz with the filter settings in SparkSDR as the default values 150 and 3000. When I change those settings to -10hz and 3300 Hz there is not such a noise between 0 and 3000 Hz in the WSJT-X waterfall.
I have not been able to find a solution for my audio problems in
the Ubuntu pc except that SparkSDR is working in FT8 (but not in
Digi-U). Unfortunately I don't have any knowledge of Linux (have
to look into tutorials or other information in the web every time
when I want to try something new, here I did not find the
information). If there is somebody who could tell me how to reset
all the changes I have done in between in the audio and permission
settings so that I could start from scratch again would be great.
Otherwise I will format the drive and re-install Ubuntu (something
I would prefere to avoid if ever possible).
73
Juergen, DL8LE
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Hi Mike and Alan,
I have tried the VAC settings on your screenshot as well, but my
Asus ZenBook does not like them, don't know why, might be because
of specific modifications for some driver software they have
implemented. But I am very glad that it works now with my VAC
settings and I can use WSJT-X in Digi-U (WSJT-X because it allows
me to use DXLab, which is very helpful).
I will wait now for the result of Alan's investigation regarding the filter bandwidth.
Just for info: I have been running one HLII at my home (good HF site and antenna) and compared it with the Flex6400 in our clubstation in the university (15km away, medium HF site but good antenna). It is interesting that the number of decoded signals is very comparable for both rigs.
Unfortunately my second HLII has a noise floor of up to 30 dB higher than the first one, i.e. decoding capability is very poor. Any idea how to fix the hardware problem other than returning it to makerfabs (there is still warranty, but they will only reimburse the money, no repair) would be very nice.
73
Juergen, DL8LE
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Hi Mike,
I have checked the filter settings. There is no change depending on the filter settings (and also no change depending on the settings of the LNA). The difference between the two units remains unchanged (today with indoor antenna because of thunderstorms outside below -140dB for the good one and below -105/110 dB for the device with much lower sensitivity.
I will raise my question in the HL II User Group (registered today following your message).
73
Juergen, DL8LE
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