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Test ADC I/Q first scan always bad when set to 6m band

[email protected] All Messages By This Member #126310 I finally got my shipment of replacement SMPS and got the whole unit buttoned up.? Been using the transceiver happily for a while now. ? Since I finally buttoned up the QMX+ for a while, I decided to rerun the hardware tests. ? I noticed something I did not notice before. ? I happened to be operating on 6m (the CQ WW VHF contests is going on right now) and the transceiver was set to 50.313. ? When I ran the Test ADC I/Q test, the first scan always came out looking bad: ? ? If I hit "R" for refresh, I get a good scan ? This does not always happen if I change the band, but it seems to always happen on 6 meters. ? Is this typical?? Should I worry?? Looks like things do not get spun up for the test as quickly on 6 meters, but a refresh always shows a good set of sine waves. ? My guess is that I should not worry, but I was wondering if my QMX+ is somehow different. ? Thanks Mark W8GU ?
Hans Summers All Messages By This Member #126311 Don't worry, I've seen it too. I couldn't quite work out why it happens or how to prevent it. But I recall I wrote in the documentation that this can happen and press the R key to run it again to check.? 73 Hans G0UPL toggle quoted message Show quoted text On Sun, Jul 21, 2024, 18:09 w8gu via <w8gu=[email protected]> wrote: I finally got my shipment of replacement SMPS and got the whole unit buttoned up.? Been using the transceiver happily for a while now. ? Since I finally buttoned up the QMX+ for a while, I decided to rerun the hardware tests. ? I noticed something I did not notice before. ? I happened to be operating on 6m (the CQ WW VHF contests is going on right now) and the transceiver was set to 50.313. ? When I ran the Test ADC I/Q test, the first scan always came out looking bad: ? ? If I hit "R" for refresh, I get a good scan ? This does not always happen if I change the band, but it seems to always happen on 6 meters. ? Is this typical?? Should I worry?? Looks like things do not get spun up for the test as quickly on 6 meters, but a refresh always shows a good set of sine waves. ? My guess is that I should not worry, but I was wondering if my QMX+ is somehow different. ? Thanks Mark W8GU ?
Zhenxing Han N6HAN All Messages By This Member #126314 Mark, I believe the ADC I/Q test is always done on the fourth band (band index=3), so unless you configure the 6M band to be the fourth band, it’s done on a different band (maybe 40M on a QMX+).
Hans Summers All Messages By This Member #126456 Hi?Zhenxing > Mark, I believe the ADC I/Q test is always done on the > fourth band (band index=3), so unless you configure? > the 6M band to be the fourth band, it’s done on a? > different band (maybe 40M on a QMX+). For some reason your post gave me an idea. You are of course correct, ADC I/Q test is always?run on the 4th band (band index 3).? But I experimented and found:? 1) If the transceiver is already on the fourth band... say, 40m on a QMX+, then when you run the ADC I/Q test it is successful on the first try, with no need to press R for Refresh.? 2) If the transceiver is not already on the fourth band, ADC I/Q will always produce an erroneous result when the ADC I/Q screen is first opened, with incorrect amplitudes and a DC offset; this is always resolved by pressing the R key to re-run it.? Both of these are quite repeatable; which gives me a very big clue on fixing it ;-)? ?So I noted it on my bug list, not that it is terribly urgent but anyway, it would be neater to solve it.? 73 Hans G0UPL toggle quoted message Show quoted text On Sun, Jul 21, 2024 at 7:12?PM Zhenxing Han N6HAN via <spica.han=[email protected]> wrote: Mark, I believe the ADC I/Q test is always done on the fourth band (band index=3), so unless you configure the 6M band to be the fourth band, it’s done on a different band (maybe 40M on a QMX+).

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