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Re: QMX bad RF filter sweep

 

Also check that it is still set to the correct band version in system settings?
Re: QMX+ SWR sweeps with SSB firmware?

 

On Fri, Apr 4, 2025 at 04:49 PM, mux_folder2001 wrote:
but it still would not sweep during an SWR sweep but then I noticed that the rig was set on VFO B
The same here.
?
73 Ludwig
Re: QMX+ SWR sweeps with SSB firmware?

 

On Fri, Apr 4, 2025 at 07:31 AM, Roger E Critchlow Jr wrote:
I'm sure there's a reasonable explanation for all this
Roger,
This behavior could result from a cold solder joint in T507 or its associated circuitry.? Temperature can change its connectivity.
Stan
Re: QMX+ SWR Sweeps FW bug report

 

Noted, thanks Tony

73 Hans G0UPL


On Fri, Apr 4, 2025, 16:53 mux_folder2001 via <canthony15=[email protected]> wrote:
I'm not sure if Hans reads every message so I am posting this with its own heading.

I discovered that the SWR sweep test does not actually sweep if the rig is set to use VFO B. Other sweeps seem to work correctly with VFO B selected.

Tony
AD0VC
Re: QMX+ All LPF Sweeps Are Bad #lpf #QMXplus

 

I found the problem.? I was curious about the output power and turned on the power display.? When the display didn't show power or swr, I started troubleshooting that symptom.? It didn't take me long to to track the problem down to a bad solder joint on T507.? Repairing that connection corrected the LPF sweep issue and the swr display.? It makes sense, the measuring circuit was common to all of the LPF paths, thus the across the board impact on the sweeps.
?
Thanks.
?
Andy
WB9YXA?
?
?
Re: All LPF Sweeps Are Bad

 

Nobody else is complaining of the same problem, so, were
I in your shoes, I would look for a systemic problem in the
way I assembled my QMX+.

Several thoughts:

1) perhaps you chronically miscounted the turns on your toroids?
2) perhaps you chronically scrambled toroids when you installed them?
3) there are some test points in the LPF that seem to attract thru hole
capacitor leads (assuming you have a version 2 or older board).
4) bad solder joints on toroid wires are so common as to be a cliche.

About the only thing I can tell you for certain is the radio doesn't
do this when built correctly with good parts.

What I would not do, is transmit to anything other than a dummy load
until this is fixed.

-Chuck Harris, WA3UQV


On Thu, 03 Apr 2025 22:17:52 +0000 "WB9YXA" <ahoffman1@...>
wrote:
I have assembled and have working a QMX+, with one caveat;? all of
the LPF sweeps are bad.
The audio filter sweeps, RF filter sweeps, image sweeps, and SWR
sweeps look reasonable, although on a couple of bands the SWR sweeps
aren't flat across the entire bandwidth swept, but were always good
in the ham band frequencies.? The I/Q sweeps all looked good except
for 160 Meters where the phases were in sync for some reason.? Not
really a problem for me, I don't own that much wire. Here's the real
problem.? All of the LPF sweeps are bad.? For example: 0 ?|
* .* ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?* .* ?* ?* ? ?. ?* ?* ?* ? . |
* ? ?* ?* .* ?* ?* ?* .* ?* ?* ?* ?* ? ?* ?* ?* .* ?* ?* ? ?* ?* ?*
* ?*. | ?* ?* ** * .* ?* ?* ?* .* ** ** ** ** ** ** * ?* .* ?* ?* ?*
** * ?* ?* ?** | ** ** ** **.* ?* ?* ?* ** ** ** ** ** ** ** ** * .*
* ** ** ** * ?* ?* * * | ** ** ** **.** * ** ** ** ** ** ** ** ** **
** **.* ** ** ** ** ** * ** * * | ** ** ** **.***|*** ** ** ** ** **
** ** ** ** *** *** ** ** ** **** ** * * | ** ** ** *** **|** *** **
** ** ** ** ** ** *** ** *** ** ** ** *** *** * * | ** ** *** **
**|** ** ** ** ** *** ** ** *** ** ** ** ** *** *** ** ** ** * | *
*** *** ** **|** ** ** ** ** ** **.*** *** ** ** ** ** *** *** ** **
** * | * * ?* ?* ?* **|** ** ** * ?* ?* ?* .* ?* ?* ?* ** ** ** * ?*.
* ?* ** ** * | * * ?* ?* ?* ?*|* ?* ?*. * ?* ?* ?* .* ?* ?* ?* ?* *
* ?* ?*. * ?* * ?* ?* | * * ?* ?* ?* ? |* ?* ?*. * ?* ?* ?* .* ?* ?*
* ?* * ?* ?* ?*. * ?* * ?* ?* |* ?* ?* ?* ?* ? | ? * ?*. * ?* ?* ?*
.* ?* ?* ?* ?. ? ?* ?* ?*. * ? ?* ?* ?* |* ?* ?* ?* ?. ? | ? ? ?*. *
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?*. * ?* ?* ?* .* ?* ?* ? ? . ? ?* ?* ?*. * ? ? ? * ?* |* ?* ?* ?*
. ? | ? ? ? . ? ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?*. ? ? ? ? * ?* |*
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?. ? ? ? ? ? . ? ? ? ? ? ?. -8 |* ? ? ? ? ? . ? | ? ? ? .
. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
----------------------------------------------------------------------------
6 ? ? ? ? ? 9 ? ? ? ? ? 12 ? ? ? ? ? 15 ? ? ? ? ?18 ? ? ? ? ? 21 0
|. ? ? ? ?*. * ?* ? ? . ? ? ? ? . ? ? ? ? . ? ? ? ? ?. ? ? ? ? .
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** *.** ** ** ** * ** ** ** * ** **.* |** ** ** ***|*** ** ** ** ****
** ** ** *.** ** ** ** * ** ** ** * ** **.* |** ** ** ***|** *** **
** **** ** ** *** *** ** ** **** ** ** **** ** **.** |* *** *** .*|**
*** ** *** *** ** ** *** *** ** ** *** *** ** *** *** *** * |. ***
*** .*|** ** *** *** ** *** *** ** ** *** *** ** *** ***.** *** *** *
|. ** ** * .*| ? * ?*** *** ** ** **** ** ** *** *** ** ** ****.**
*** *** ** |. * ?* ?* .*| ? * ?* ** ?* ** ** ** * ?* * ?** ** * .* *
* ?*.** ** * ?* * |. * ?* ?* .*| ? * ?* .* ?* ** *. * ?* ?* * ?* ?*
* .* * ?* ?*. * * ?* ?* * |. * ?* ?* . | ? * ?* .* ?* ? ?*. * ?* ?* *
?* ?* ?* .* * ?* ?*. * * ?* ?* * |. * ?* ?* . | ? * ?* .* ?* ? ?*. *
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? ? ?* .* ? ? ? ?. * ?* ? ?. ? ? * ?* . ? ? * ?*. ? ? ?* ?. |.
. | ? ? ? ?.* ? ? ? ?. * ? ? ? . ? ? * ? ?. ? ? * ? . ? ? ?* ?. -7
|. ? ? ? ? . | ? ? ? ?.* ? ? ? ?. ? ? ? ? . ? ? * ? ?. ? ? ? ? .
* ?.
----------------------------------------------------------------------------
16 ? ? ? ?24 ? ? ? ? 32 ? ? ? ?40 ? ? ? ?48 ? ? ? ? 56 ? ? ? ?64
?72 All of the other bands exhibit a similar pattern. I tried
looking for something common to all of the filters, but nothing I
came up with made any sense given that the other sweeps were
'normal'. Since everything looked OK except for the LPF sweeps, I
decided to perform a smoke test.? I hooked it up to EFHW at 20 feet
and worked Oklahoma on 40 Meters FT8, so the transceiver is working.
I don't have the necessary test equipment to check the spectral
purity of the output signal so I'm hesitant to continue using it on
the air until I resolve this problem. I tried searching for a
solution both here and with Google, read a lot about fixing issues I
don't have but nothing that pointed me in the right direction. Thanks
all for the great ideas I'm about to receive. Andy WB9YXA
QMX+ SWR Sweeps FW bug report

 

开云体育

I'm not sure if Hans reads every message so I am posting this with its own heading.

I discovered that the SWR sweep test does not actually sweep if the rig is set to use VFO B. Other sweeps seem to work correctly with VFO B selected.

Tony
AD0VC
Re: QMX+ SWR sweeps with SSB firmware?

 

开云体育

I tried switching back to 1.027 but it still would not sweep during an SWR sweep but then I noticed that the rig was set on VFO B! I switched back to VFO A and it sweeps correctly now!

That seems like a bug to me because the sweeps for everything else work with VFO B, just not the SWR sweep.

Whew.?

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of mux_folder2001 via groups.io <canthony15@...>
Sent: Friday, April 4, 2025 8:29 AM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
I can tell it is not sweeping when doing an SWR sweep because the external SWR meter holds steady while connected to my 6BTV. If I do an LPF sweep, the external meter swings all over the place as it sweeps.

Tony
From: [email protected] <[email protected]> on behalf of Chris <chris.rowland@...>
Sent: Friday, April 4, 2025 2:26 AM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
On Thu, Apr 3, 2025 at 02:00 PM, mux_folder2001 wrote:
It is clearly not actually sweeping for some reason.
How can you tell?? You need to be monitoring the frequency to see if it is sweeping.
?
Chris, G5CTH
Re: QMX bad RF filter sweep

 

Thanks for the reply! Could the solder joint have gone bad on its own? As I stated, it was working perfectly fine until about 1-2 weeks ago. I'll test it this evening though
Re: QMX+ SWR sweeps with SSB firmware?

 

Okay, I am running? and have run the calibrations, but haven't started adjusting band settings or attempting any SSB yet.? ?This is a QMX+ connected to a mag loop antenna.
?
Keying CW on 40m, I got SWR protected, so I Menued into Hardware Tests > Tune SWR and and tuned.? The SWR reported is flickering around 1.7 and 1.8, which shouldn't trigger SWR protect.? ?Ah, but I'm connected to a mag loop antenna, and the SWR reported continues to flicker around 1.7 and 1.8 as I tune the loop all the way to 10m and back again.? The loop tuning is working, in receive I can hear the loop resonance moving as a peak in received noise.
?
So I connect the serial monitor, go to the diagnostics page, and T on 40m.? It reports an SWR of 1.2-1.3.??
?
Then I go back to the QMX menu to Tune SWR, and now it reports 10.? But I'm no longer sure what frequency the radio and the antenna are tuned to at this point.
?
Then I turn the radio off for an hour.
?
And when I come back I open the Serial Monitor, navigate to Hardware tests > SWR scan.? It scans from 3MHz to 9MHz and reports 10 for every frequency.? (But I realize later that I might have overlooked a dip at the resonant frequency, they can be easy to miss.)? I go back to the radio and tune the mag loop for maximum received noise.? I do another SWR scan it now reports 1.95 to 2.1 for every frequency in the scan.??
?
I go back to Hardware Tests > Tune SWR and it now flickers around 1.9-2.0, but the SWR now responds when I tune the mag loop, and I'm able to tune it down to 1.33.? But I get SWR protected again before I can send my whole callsign.
?
I begin to feel like an unreliable witness at this point.? I go back to Hardware tests > SWR scan.? It draws 10 except for a small spike down around 7.? I peak the antenna to 7025kHz and scan again, now I get an obvious and substantial spike down to 1.5 SWR.
?
I'm sure there's a reasonable explanation for all this.
?
-- 73 -- rec -- ad5dz --
Re: QMX+ SWR sweeps with SSB firmware?

 

开云体育

I can tell it is not sweeping when doing an SWR sweep because the external SWR meter holds steady while connected to my 6BTV. If I do an LPF sweep, the external meter swings all over the place as it sweeps.

Tony

From: [email protected] <[email protected]> on behalf of Chris <chris.rowland@...>
Sent: Friday, April 4, 2025 2:26 AM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
On Thu, Apr 3, 2025 at 02:00 PM, mux_folder2001 wrote:
It is clearly not actually sweeping for some reason.
How can you tell?? You need to be monitoring the frequency to see if it is sweeping.
?
Chris, G5CTH
Re: QMX bad RF filter sweep

 

Hi Hector,
?
alle the values are much to low, around -40 dB for the (real) peaks. It looks like a bad connection in the RX path. Please check solder joint of L401 towards IC402 pin9 for QMX Rev. 1 or towards "RX_IN" for later revisions.
?
73 Ludwig
Re: QCX+ Menu 8.5 Ref frq

 

I like to participate in the ARRL FMT runs.?So . . .?
?
I have investigated frequency response accuracy of my High and Low band QDX's, my HB QMX and my QMX+.
Don't have a QCX so can't speak direct to that model.?
?
All have been within a hertz or two or better, right out off the assembly bench when checked with 2 different Leo Bodnar Precision GPS Disciplined Clocks units.? I have found that I can tweak the TCXO system setting by a few hertz , from as little as +2 to a high of +10 on one band for best frequency response.? Be advised that the best delta will vary a bit ( maybe 0.5 Hz worst case) from band to band in a given radio.?

I use FLdigi on the Frequency Measurement Test OpMode. Found it to be quite useful and instructive in showing things like warm-up drift, probable doppler shifts of received over the air signals and subtle changes ( hundredths (0.0x Hz) or less of shifts) just sitting on the bench in response to my heat or AC cutting on and off.? And there will be a bit of offset needed to completely correct for the FMT modem response on the particular computer on which you are running the FLDigi program.?
?
Now having said that, I have spent hours measuring and analyzing over the air received WWV and CHU signals and its a rare band on a rare day & time, on a rare day of overall radio 'quiet' when the signals are rock solid as seen in FLDigi.? You have to be located inside the first skip zone of the transmitters for consistency in that.?
?
And I'll bet for actual Ham Radio Operations, all the Q's will be just fine as assembled.?
?
There is LOTS of interesting information, articles and How-To's for Frequency Measurement Testing with relatively simple and inexpensive methods these days.? ?Just give it a Google and wade in.? There's even a FMT-NUTS group.io.?
?
GREG? KI4NVX
Re: QCX+ Menu 8.5 Ref frq

 

Hi Pierre. Since you indicated a reference frequency of 25 MHz, Bruce correctly assumes you have the TCXO option installed in which case you shouldn’t need to worry about calibration. If you don’t have the TCXO installed then the reference frequency is 27 MHz and your procedure should work ok to get close however getting exact zero beat may be difficult since the audio rolls off at the low end.?

Good luck ….73 …. Ron

On Thu, Apr 3, 2025 at 20:41 Pierre - FK8IH via <jb.gallauziaux=[email protected]> wrote:
I would like to know if I can apply the following procedure to calibrate the Ref frq without GPS?
Using a QCX+ 20M Band I would go to WWV 15MHz and read precisely the frequency for a zero beat. If I read 15.003.00 could I modify menu 8.5 to read 25.005.000 with the TCXO and have a more precise QCX+?
73 - Pierre - FK8IH
QMX bad RF filter sweep

 

Hi! I recently posted about having some bad reception on my qmx after updating the firmware... Well it seems that it is something related to the hardware of my unit.
?
I checked the RF filter sweep and it seems that my unit became a bit deaf.
?
How should I proceed from here? What tests should I do?
This unit was working before, so my guess its that I messed up something?
This tests results are after a fresh firmware install and a factory reset.
?
Thanks in advance!
73 de EA4IIF.
Re: RTC battery mistake

 

On Thu, Apr 3, 2025 at 04:35 PM, Greg McCain wrote:
WARNING: the jumper wire must sit flush
down on the board. Otherwise it will short
with the metal body of the SMA
connector!
?
?
The JP218 jumper wires are well clear of the SMA connector, in front of it, not underneath at least on the Rev 3 boards. Maybe this was moved on the later PCBs.
?
Chris, G5CTH
Re: Gibberish characters appended onto end of Message 1

 

Stan, thank you for such a detailed dissection of this problem! I'll have to try the fix you described, today, at least the fix that doesn't involve a terminal, as I don't have the extra time (or desire) to become part of some worldwide de-bugging team.
?
In the meantime I have been dealing with this by using Message 2, which doesn't seem to have the problem.?
?
Do you happen to know if there's a list of recognized bugs to be fixed, so we can make sure this one's on it? (I'm assuming if it isn't on the list, it should be).?
Thanks again!
Re: Tariffs?

 

Radio-related aspect...

Heard island is on the tariff list, I was reading this BBC article? and thought woaaahh, no humans have visited in over a decade? But I well remember the Heard island DXpedition, specifically because a QRP Labs Ultimate3S was on the ship and tracked the position accurately to 6-char Maidenhead grid subsquare resolution every 10 minutes reliably en route. Didn't seem that long ago! But I looked it up and indeed, it was 2016. How time flies! Then read further down the article and indeed it does say the last humans to visit the island were some amateur radio enthusiasts in 2016!

73 Hans G0UPL


On Fri, Apr 4, 2025, 14:14 Greg McCain via <gamccain50=[email protected]> wrote:
Well ...

The newly signed hit list showed 10% for Turkey.
But so far the reality has been changing almost daily.

Bumpy road ahead is about all I'm sure of to be honest. I did see that there are entities on the list where the non existent populations are subject to tariffs. So ....? At this point, Who knows if the order and list are even accurate??

Or if the in place exceptions for small quantities/values still apply. Or if it all just grinds to a halt.

Interesting times. Be careful what you wish for.?

Try to have some radio fun today.?
Support Hans where you can.?


GREG




On Fri, Apr 4, 2025 at 7:56 AM, John Pokluda via
<john.pokluda=[email protected]> wrote:
Turkey being part of the EU, expect to pay +20% on import.? Unless things change.
Re: QMX+ shutdown problem #qmx #QMXplus #shutdown

 

On Fri, Apr 4, 2025 at 11:11 AM, Matti OH6BEX wrote:
The QMX+ rev 3 does not start. With power button pressed, it takes 0.8 A current which slowly decreases to 0.5A.
0.8 A is to much.
Vcc and Vdd are around 0.1 V.
To start the controller you need Vdd at around 3 V. This voltage could be produced by IC101 but I guess there is a fault in the chain before. Pleas read QMX QMX_plus Startup to find this chain.
Testing diodes with a DMM: D108 shows 0.17V and 0.2V, D109 shows 0.11V and 0.12V.
meaning that both diodes are damaged. But as the diodes are in-circuit, these values are probably meaningless.
A broken D109 is affecting Vdd.
Resistances:
...
These values are not so bad and affected by the broken diodes.
I also received some spare SMPS'es and installed those to the older QMX+ rev 1 which I broke by accidentally inserting faulty SPSM'es from another faulty QMX.
?
Receiver works ok.
Diagnostics page is all OK except TX Voltage which is RED showing 10.4 volts (DC input is 12.2V).
I guess you destroyed the PA and because of high current Q507 was following the PA in dead. Please don't transmit with a broken Q507 and read QMX QMX_plus PA problems, broken BS170 .
Apparently something in the TX chain is destroyed.
I have no oscilloscope. Is there something that I could check with an ordinary DMM?
Go to Terminal - Diagnostics (the controller will set a signal to switch off the PA voltage) and check voltage at D, G and S of Q507. If all values are nearly the same and high the Q507 should be broken. For more debugging check the Wiki page above.
?
73 Ludwig
?
Re: Tariffs?

 

Well ...

The newly signed hit list showed 10% for Turkey.
But so far the reality has been changing almost daily.

Bumpy road ahead is about all I'm sure of to be honest. I did see that there are entities on the list where the non existent populations are subject to tariffs. So ....? At this point, Who knows if the order and list are even accurate??

Or if the in place exceptions for small quantities/values still apply. Or if it all just grinds to a halt.

Interesting times. Be careful what you wish for.?

Try to have some radio fun today.?
Support Hans where you can.?


GREG




On Fri, Apr 4, 2025 at 7:56 AM, John Pokluda via groups.io
<john.pokluda@...> wrote:
Turkey being part of the EU, expect to pay +20% on import.? Unless things change.
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