Good morning Charlie, Yes, the logfile that I sent to Mike covered a large part of the day including the moment that the sked frequency started to drift away. I like your idea to test with another radio. Of course I don't have a second homemade transceiver for 144 MHz with CAT-control, so maybe your idea of using an SDR is worth investigating. Still, if such a test shows that my station setup is unique, then the question remains what CAT-commands or sequence of events and CAT-commands can lead to WSJT-X changing the sked frequency. I have even considered to program a PIC processor to behave as an ideal transceiver to test if the same behavior occurs. I have a puzzle to solve and will inform you of what I find. Thanks again for helping me! 73, Jos, PA0JOZ
On Sat, 28 Sept 2024 at 07:07, Charles Suckling via wsjt-devel < wsjt-devel@lists.sourceforge.net> wrote: > Hi Jos > > It does appear your situation is unique. As far as I'm aware, the rig > control software within WSJT-X itself has not changed for years, and this > problem has never been reported before. As I mentioned yesterday, WSJT-X > has been used for EME on 24GHz where Doppler shifts often exceed 19kHz. It > has also been used successfully on 47GHz, so I'm confident that the issue > is not related to the magnitude of the Doppler shift. > > I wonder if you have some other radio you could test with? This could be > for example an SDR controlled by software such as HDSDR or SDR Console. > Both of these programs can be connected to WSJT-X, since they both have > emulators (using a virtual com port connection such as com0com). Audio can > be routed via virtual audio cables, > > Did the data that Mike studied cover the case during which the sked > frequency was changing? > > 73 > > Charlie > > On Fri, 27 Sept 2024 at 16:50, Jos F.M. VanderList via wsjt-devel < > wsjt-devel@lists.sourceforge.net> wrote: > >> Good afternoon all, >> While monitoring the DL0SHF beacon at 10 GHz I noticed strange behavior >> of the Doppler tracking. >> I set the sked frequency initially to 10368.024 MHz, with Doppler >> tracking "On DX Echo". >> DL0SHF appears initially at its normal place in the waterfall. >> However, when the (absolute) value of the DX Doppler exceeds >> approximately 19 kHz the sked frequency gets changed in the Astro window, >> without me touching anything. The change is steadily downward with 1 or 2 >> Hz at a time. At the same time the VFO frequency of the transceiver is also >> ordered to a lower frequency. And the result is that the beacon is drifting >> slowly upwards in the waterfall. >> I also noticed that in the situation that WSJT-X alters the sked >> frequency it is sometimes possible to adjust the sked frequency by turning >> the tuning knob of the transceiver, without pressing CTRL. >> Mike, W9MDB, checked the communication between WSJT-X and the transceiver >> and he didn't find anything strange there. So to me it seems that the >> problem is in WSJT-X itself. >> Before anyone asks: all my oscillators are locked to my 10 MHz GPSDO. >> And the transceiver frequency follows the frequency ordered by WSJT-X. >> I'll give some examples from this afternoon. Sked frequency is the sked >> frequency in the Astro window. Transceiver frequency is the frequency as >> shown below the Monitor button in the main WSJT-X window. And DXDop is as >> shown in the Astro window. >> DXDop: TRX freq.: Sked freq.: >> -17000 10368.007000 10368.024000 >> -18000 10368.006000 10368.024000 >> -19116 10368.004877 10368.023993 >> -19500 10368.004232 10368.023932 >> -19999 10368.003480 10368.023479 >> -20497 10368.002335 10368.022832 >> Can anyone shed some light on this? Why is WSJT-X altering the sked >> frequency if the Doppler is more than 19 kHz? And why isn't the Doppler >> tracking keeping the beacon stable in the waterfall? Is it a bug, am I >> doing something wrong, is my understanding of the Doppler tracking wrong? >> 73, Jos, PA0JOZ >> _______________________________________________ >> wsjt-devel mailing list >> wsjt-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/wsjt-devel >> > _______________________________________________ > wsjt-devel mailing list > wsjt-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/wsjt-devel >
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