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#QMX firmware updates, factory resets and 1_00_011 advanced settings

#qmx

Hans Summers All Messages By This Member #114629 Hi all There appears to be a certain amount of confusion on this topic and so I need to clear that up. 1. In general, after a firmware update, a factory reset should NOT be required. However there may be occasions where new menu items are introduced, and due to some previous use of the corresponding EEPROM memory chip location in some prior firmware version, or perhaps log file contents, the configuration item could contain some non-sensical value, which could cause some strange symptoms. You should normally be able to resolve this if you check the release notes and see what the new/changed settings are then just check what their value is in the menu.? 2. If there are really strange or unexpected issues you can't understand, particularly after a firmware update, then a factory reset would not be a bad "last resort" idea to try.? 3. A factory reset basically erases the EEPROM chip, including all your configuration parameters including message and frequency memories. Then populates them with sensible default values. Since you lose any configuration you have done, the factory reset is quite a drastic action. So it's best avoided unless it is required. Certainly it is not my recommendation to always do a factory reset after every firmware upgrade.? 4. The firmware release notes for 1_00_011 on the web page show the following note, near to the place you download the file from: "NOTE: After upgrade from an earlier version, please check the new settings items and make sure they are all? set to ENABLE and that the band version is set correctly to match your hardware" Which is basically what I'm saying above.? 5. 1_00_011 advanced configuration parameters should all be set to ENABLE. If you do a firmware upgrade from a version below 1_00_011 to this version or above, then go into the menu and check these parameters.? 73 Hans G0UPL
Mike KK7ER All Messages By This Member #114659 Hmm... so I went into the menu and all three advanced options were set to DISABLE (after update to 012 from 010). After changing them to ENABLED, RF sweeps on all bands are bad (essentially zero output -- flat noisy output around -70dB). I tried changing the advanced settings back and restarting but no joy. Is it possible that the enabling the new settings could "brick" a low bands QMX? 73, Mike KK7ER
Mike KK7ER All Messages By This Member #114681 The good news is that despite the terrible RF sweeps, the rig is working just the same as before:? good receive performance and 4.3W out on 20m. I did have to disable SWR protection since even with the threshold raised to 3, it trips while calling CQ (measured SWR using external meter shows 1.2:1). FYI. 73, Mike KK7ER
Daniel Walter All Messages By This Member #114685 Mike,? SWR protection ON nearly always trips the QMX and shows the 'S', even when trigger level is 3. This is not new, but was present with the prior f/w. It even happens with a very good 50 ohm resistive dummy load. Yesterday I activated two summits and found the problem was still present. In one case, I noted that the SWR graph on the QMX screen showed a momentary full scale reading on transmissions, even though my 4SQRP tuner showed a nearly 1:1 SWR. I am not sure why this happens, but I suspect it is the reason for the SWR Protection tripping easily.? By the way, the Volume control is a pleasure to use now - very predictable. Very strong signals can still distort the audio, but not as painfully and are easily controlled with the volume control.? Keying glitches are still present, but did not prevent making contacts easily.? -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.? -Jules Renard
Hans Summers All Messages By This Member #114695 Hello Dan The problem with the SWR is known and easy for me to fix, I'll try and make a new release this week which fixes it. The issue is that when there is NO power or too little power, the measured ADC values for Fwd and Ref power are just noise, and the ratio is equally nonsense. On activating PTT, WSJT-X waits a short time until sending audio. During this time the SWR is nonsense. I have to fix this urgently.? 73 Hans G0UPL toggle quoted message Show quoted text On Mon, Dec 11, 2023 at 3:12?AM Daniel Walter via <nm3a=[email protected]> wrote: Mike,? SWR protection ON nearly always trips the QMX and shows the 'S', even when trigger level is 3. This is not new, but was present with the prior f/w. It even happens with a very good 50 ohm resistive dummy load. Yesterday I activated two summits and found the problem was still present. In one case, I noted that the SWR graph on the QMX screen showed a momentary full scale reading on transmissions, even though my 4SQRP tuner showed a nearly 1:1 SWR. I am not sure why this happens, but I suspect it is the reason for the SWR Protection tripping easily.? By the way, the Volume control is a pleasure to use now - very predictable. Very strong signals can still distort the audio, but not as painfully and are easily controlled with the volume control.? Keying glitches are still present, but did not prevent making contacts easily.? -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.? -Jules Renard
Daniel Walter All Messages By This Member #114705 Hans, Glad to hear that a fix is imminent. You mentioned WSJT-X, but this happens with CW as well. Same issue? -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.? -Jules Renard
Hans Summers All Messages By This Member #114706 Hello Daniel Same issues, yes. On CW the PTT (RX -> TX changeover) happens some milliseconds before the?RF starts too. As it should. But at this time the SWR, being a ratio of two numbers which?are just noise, is nonsense. So some mechanism?needs to be introduced to mark the SWR as invalid and ignore it, until the provided power reaches a certain threshold. I will add it, don't worry! 73 Hans G0UPL toggle quoted message Show quoted text On Mon, Dec 11, 2023 at 5:04?PM Daniel Walter via <nm3a=[email protected]> wrote: Hans, Glad to hear that a fix is imminent. You mentioned WSJT-X, but this happens with CW as well. Same issue? -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.? -Jules Renard
Donald S Brant Jr All Messages By This Member #114752 I ran into the same issue with a hardware VSWR protection system for a client's RF test system.? I had to add an additional comparator which monitored power and inhibited the VSWR trip until a user-adjustable power level was exceeded.? Same approach, only in hardware.?? 73, Don N2VGU
Mike KK7ER All Messages By This Member #114806 FYI.? After installing 013 and doing a factory reset, the RF sweeps are sane again. 73, Mike KK7ER

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