QDX@QRP/QRPp/QRPpp/QRPppp/QRP////
Had forgotten my QDX output on 80m. Sorry for new Topic!
Tnx QSO, K8BCL !
72,
Bill, N4QA
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
The sweeps in this post look pretty representative: /g/QRPLabs/message/105619JZ On Sun, Jul 30, 2023 at 8:50?AM clansd via groups.io <clansd@...> wrote:
Thank you both, I will go through and perform those checks.
Is there anywhere I can go to see what these sweeps should look like for the QMX? It would be nice to have at least from a knowledge perspective as at the moment I am going solely based off of a photo in the QDX manual.
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
Thank you both, I will go through and perform those checks.
Is there anywhere I can go to see what these sweeps should look like for the QMX? It would be nice to have at least from a knowledge perspective as at the moment I am going solely based off of a photo in the QDX manual.
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
Chris, I agree with Evan and suggest you also check the connections at T507 and verify that C526 has not been damaged.
Why? It is a bit troubling that you saw no change in the sweeps for 80/60/40 when you connected the dummy load. It is as if there is a second fault and no connection to the load exists.
JZ KJ4A?
On Sun, Jul 30, 2023, 8:25 AM Evan Hand < elhandjr@...> wrote: Chris,
I would look at the LPF for 30/20 meters (The filter is shared between these bands).? I would suspect that one of the toroids has an open connection.? Maybe try reflowing the connections.? The sweep signal must pass through the LPF to reach the receiver circuits.
The others have enough gain to work, so messing with them is unnecessary.
73
Evan
AC9TU
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
Chris,
I would look at the LPF for 30/20 meters (The filter is shared between these bands).? I would suspect that one of the toroids has an open connection.? Maybe try reflowing the connections.? The sweep signal must pass through the LPF to reach the receiver circuits.
The others have enough gain to work, so messing with them is unnecessary.
73
Evan
AC9TU
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
Hi all,
I just finished re-running the tests, with a different set of connectors. I have tested the dummy load and know it, and its' connectors are good. Unfortunately, the results are essentially identical to the ones posted above :(
I believe the issue lies with the issue seen in the RF sweep. Assuming that the signal strenth values are comparable between bands (eg. a value of -40 in the 30m sweep corresponds to the same power of sensed signal in the 80m sweep for example), we see the following:
Only in the 60m and 40m band RF sweeps are the signals strong in what should be their passpands, relative to the values shown in graphs for other bands. This lines up with our findings in the audio sweeps, which look roughly correct for both 60m and 40m, but are significantly attenuated for all other bands. Assuming that the generated signal first passes through the respective band's bandpass filter before the detection is done in both the RF and audio sweeps, this makes sense.
As for what might be causing this? I am not sure. Perhaps this could be a result of bunching up of toroid windings during installation? It would help greatly to know if there are any further tests that could be performed to further locate the fault.
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
Thank you Mike! I will give that a shot and come back here to see if that has any impact.
If there is anyone else with an idea of what might be going on, please feel free to chime in as I am not yet familiar with the QMX's internal circuitry.
73,
-Chris VA3XCL
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MM7BMY,
Guess it's down!
72,
Bill, N4QA
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Re: QDX @ QRP / QRPp / QRPpp / QRPppp
Tnx QRPppp QSO, N9RFJ !
72,
Bill, N4QA
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Re: U3S and strange sudden changes in locator
Hi Alan,
Thanks for the info! I missed indeed setting for checksum in the info check!
73
Pa3 AAW / Hans
toggle quoted message
Show quoted text
Op 29 jul. 2023, om 20:43 heeft Alan G4ZFQ <alan4alan@...> het volgende geschreven:
On 29/07/2023 15:53, Hans Merz wrote:
But when I use it "at home" *JO22*(hi) the same changes with the same "ghost locations" happen. I use the GPS receiver QLG2 in combination with the U3S. Has anyone experiences like this? Or hints what is happening? Hans,
In the configuration of the U3S is a setting for "checksum" this prevents a corrupted NMEA sentence from changing the locator.
But it can not be set if you want to send your locator mobile.
73 Alan G4ZFQ
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is LU7AA down i cannot connect
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Re: QDX @ QRP / QRPp / QRPpp / QRPppp
Oops! Wrong screenshot!
Tnx QRPppp QSO, WD8ANZ!
72,
Bill, N4QA
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Re: QDX @ QRP / QRPp / QRPpp / QRPppp
Tnx QRPppp QSO, WD8ANZ.
72,
Bill, N4QA
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M,
If practice mode is on when you power up, the P does not show up on power up. If you go in the menu, then exit, it will show up again. ?But if you turn it on from the menu, it will turn on immediately. ? ?Minor firmware glitch.?
--
73, Dan? NM3A
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Re: Help Make Sense of My QMX RF And Audio Sweeps?
I was seeing RF sweeps like your 60/40/20m ones before I replaced a bad coax jumper from my QMX to the dummy load.
After fixing that they all looked more like your 80m and 30m ones.
Just a thought.
73, Mike KK7ER
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Re: QDX Terminal Emulator - problem editing values
Downloaded PuTTY and it worked!? Thank you.
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Re: Gate voltages to BS 170s are not stable. Need some suggestions.
#help
#problem
#qmx
John,
Thanks!? That was what I had recalled seeing.
Walt
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Re: QCX+ display has a text box missing the left column of dots
Looks like a bad display to me. It¡¯s fine to go ahead and do the alignment. It won¡¯t be affected by this, other than one column of the resulting bar graphs during alignment won¡¯t be there. But it shouldn¡¯t be any harder to interpret than what you are seeing now. Good luck
Ron
I have finished a 20 and a 40 QCX+ and am in the setup stage process with both. I have issues with the setup but that is for another thread. One of the front panels when I fired it the 7th column of text blocks is missing the left edge column of dots on both the top and bottom line. I have interchanged the two front panels with the two main PCBs and the results confirm it is the front panel as it does it on both main PCBs and the other front is fine on both. I can "read" the front panel and so far have not had an issue where the missing dot column caused problems. Is this an issue or should I just not worry about it and go about trying to get both of the setups resolved?
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EI9ILB
Scott Tillotson
Ronald Taylor