Re: Available Hand Mics for QMX SSB ?
No problem at all Jim!? For anyone wondering how to directly reply to someone here through 开云体育, when you are making a reply to that person there is the option to change the To: field.? Changing this to Sender will change the subject line from Re: to Private: and that will initiate a Direct Message with the person.?
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It took me way to long to recall how to do this myself!?
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Back to the topic, I will reach out to you Jim!?
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I seem to recall a while back, discussion regarding the ability to export and import configuration files.
With 4 QMXs, 6 QDXs and all of the associated configuration settings, it would be quite nice to be able to keep a text copy of my "standard" configuration settings.
Even if it is as basic as doing a "show config" that can be screen scraped and copied from Putty, modified, and then pasted back in with a "config x" command.
Is this on your roadmap?
PS. no pressure and not asking for an estimated delivery date. :-)
--
Randy, N4OPI
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Re: QMX/QMX+ internal Transmit Voltage measurement question
What I still don't understand is this:
?- I measure 11.22V at the drain of Q507, while pressing the 'T' key in the diagnostic screen
?- but the voltage displayed in the diagnostic screen is 9.8V, over 1.4V difference.
?- a check of the voltage at ADC_PA, considering the 5.7 voltage divider factor, confirms that the processor should be seeing 11.2V.
I agree, it seems like something isn't quite right. I need to investigate it.??
? This measurement discrepancy is repeatable, and present also on my other QMX+.? On my 9V QMX, the difference is proportionally smaller, with 8.4V measured and 7.2V displayed.
?
This discrepancy was misleading to one user, who thought he could safely increase his supply voltage to get a full-range TX voltage.
Full-range TX was never meant to mean 0 to 12V PA voltage. The PA voltage is expected to be a bit less than the supply voltage. Regardless of the discrepancies noted above (which I need to investigate).??
73 Hans G0UPL
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Re: Available Hand Mics for QMX SSB ?
Jason;
?
I too, am having challenges locating your email. ?I would love two of those QRP Guys cases, feel free to send me details at kvo@...?
73
Jim K8JK
?
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Re: QMX+ goes into safe mode with antenna tuned to 1.5 SWR
Kevin,?
?
Check to make sure that the solder connections on the LPFs components (especially torroids) are all good, checking continuity.? If the RF is not making it to the antenna jack then there will be a high SWR due to discontinuity in LPF.? Likewise a discontinuity in the BPF would make receive not work.
?
Brien - KE7WB
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Re: QMX+ goes into safe mode with antenna tuned to 1.5 SWR
Did you install the jumper in J501? Sounds like it may have been missed
Ron
Just finished my QMX+ and I have noticed 2 things:?
First the radio is deaf,? I can here the standard background noise, but I can not hear any CW even though I am tuned to a frequency that I know has someone transmitting CW (I can hear them on my main radio.)
Second issue? ( I think they are related) is that as soon as I try to key up,? the radio goes into safe mode.?? Everything else seems to be working good.
Any thoughts on where to look or things to check. ?
I do show an open between the center conductor of the BNC connector and ground.? That is a far as I have gotten.?
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QMX+ goes into safe mode with antenna tuned to 1.5 SWR
Just finished my QMX+ and I have noticed 2 things:?
First the radio is deaf,? I can here the standard background noise, but I can not hear any CW even though I am tuned to a frequency that I know has someone transmitting CW (I can hear them on my main radio.)
Second issue? ( I think they are related) is that as soon as I try to key up,? the radio goes into safe mode.?? Everything else seems to be working good.
Any thoughts on where to look or things to check. ?
I do show an open between the center conductor of the BNC connector and ground.? That is a far as I have gotten.?
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If you follow the instructions on the AI6XG website, you will see that you will have to modify the band configuration table, as it is a departure from the 3 possible QMX configurations that come with the stock firmware.
I have been thinking about building a 30-10 QMX, but haven't decided if I should start with a mid-band or high-band kit. I'm working on a excel table now...
gl de Russ, va3rr
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I had decent luck with the modifications described here, you need to be a bit careful on the harmonic content and the band config; iirc I had better luck with a slightly different low pass config -- I think my unit had better harmonics with LPF 1 selected for the 12m band because the LPF 2 skewed too high and it worked this way without reworking the LPF:
You absolutely will have to do some tweaking and tuning and analysis with a SA to confirm the harmonic content, but if you have the right?test equipment, spare parts supply of NP0 capacitors and toroids, and a willingness to do rework on a very tight board it is doable for sure.
On Tue, Apr 15, 2025 at 10:48?AM Hans Summers via <hans.summers= [email protected]> wrote: I want to build a qmx with at least 40, 20, and 10m bands. This is not currently an official build and I was wondering if it is recommended or indorse by Hans. I know that it is possible and I am willing to give up other bands to have all three. Thanks!
Maybe endorsing it would be taking it a step too far.? But certainly QMX was designed to allow this kind of experimentation; the Band Configuration screen (currently only available on terminal login) lets you set up any combination of bands you like. I think it's important to be realistic about what can be achieved; there are 3 LPFs and 4 BPFs. The BPFs can easily suffer unwanted parasitic resonances. The LPFs can be used with care to cover more than one band if they are adjacent bands. Take care to use a spectrum analyzer to measure the transmitter harmonic performance. I rather doubt that coverage of all bands from 40 to 10m is possible cleanly (means, complying with harmonic level regulations) and repeatably?(means, people can easily built it from a manual without necessarily having to fine-tune filters using a spectrum analyzer to achieve necessary performance).
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I want to build a qmx with at least 40, 20, and 10m bands. This is not currently an official build and I was wondering if it is recommended or indorse by Hans. I know that it is possible and I am willing to give up other bands to have all three. Thanks!
Maybe endorsing it would be taking it a step too far.? But certainly QMX was designed to allow this kind of experimentation; the Band Configuration screen (currently only available on terminal login) lets you set up any combination of bands you like. I think it's important to be realistic about what can be achieved; there are 3 LPFs and 4 BPFs. The BPFs can easily suffer unwanted parasitic resonances. The LPFs can be used with care to cover more than one band if they are adjacent bands. Take care to use a spectrum analyzer to measure the transmitter harmonic performance. I rather doubt that coverage of all bands from 40 to 10m is possible cleanly (means, complying with harmonic level regulations) and repeatably?(means, people can easily built it from a manual without necessarily having to fine-tune filters using a spectrum analyzer to achieve necessary performance).
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Hi all!
?
I want to build a qmx with at least 40, 20, and 10m bands. This is not currently an official build and I was wondering if it is recommended or indorse by Hans. I know that it is possible and I am willing to give up other bands to have all three. Thanks!
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Re: QMX CW issue, omits dits
Michael,
?
I don't know if this is your issue, but if you have used any of the "Iambic A" keyers with anticipation, then you will lose dits/dahs, as the Iambic A mode in the QMX has no dit (or dah) pre-stored memory (except when you actually squeeze, that is).? Many keyers implement a logic whereby what they call the "Iambic A" mode does have a way to store an element while composing the inter-element space (i.e., while the inter-element space is being issued), so that you can release the dit/dah paddle while the space is being issued, and still get the extra element at the end. This capability is called 'anticipation" in some keyers, and is meant to make Iambic A "more responsive". It is a matter of milliseconds, but if your fingers are muscle-trained to do that routinely with a given keyer, you will notice the difference when you don't have anticipation.
?
I have tried and used many different keyers, and can confirm that the QMX keyer does not have any specific issue. It just implements a pure Iambic A keying, with no pre-stored elements and no anticipation. This can make the keyer feel "tardy" when one comes from a keyer with anticipation, and this is something I notice when I come back to the QMX after having used another keyer. I have used the QMX up to more than 50wpm, both in Iambic A and in Iambic B, and it does not miss a dit, unless I do make a genuine keying mistake. It certainly does not miss dits at 20wpm. Provided that you don't expect it to "pre-store" your dits before the full inter-element space has been issued.
?
I can confirm that RF in the shack can actually interfere with the QMX keyer, and that can be a source of all sorts of headaches. But RFin the shack also wrecked almost any other keyer I was using, before I solved the issue.
?
Hope this helps
?
72/73 de Enzo M0KTZ
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Glad you got it working! I definitely went through a good hour of despair myself when I first got my QMX+ thinking something was wrong with the serial connection, then stumbled on an old reddit thread about updating hamlib for a different problem.
On Tuesday, April 15th, 2025 at 6:23 AM, Larry- WA2VKG via groups.io <lbakely@...> wrote:
I was experiencing many of the same problems discussed in this thread, so I've been following the advice that's been given.? ?My QMX+ and WSJT-x are now on good speaking terms!? CAT control (including "PTT") are working fine, and I'm using the QMX radio setting.
?
I'd been running an old version of WSJT-x (v2.6.1) with my DigiRig interface and FT-817.? I created a WSJT-x configuration for the QMX+, using the TS480 radio setting.? It would change bands ok, but every time I changed bands on WSJT-x it would report an error and ask me to reconfigure.? I'd click "yes", then cancel out of the settings, and it would be ok.? It would never transmit though.? WSJT-x would crash as soon as I clicked the "Tune" button.
?
Anyway, here's what worked for me (thanks Muhsin):
1- Install the latest version of WSJT-x (v2.7.0).? I did this by downloading the installation file and having it install in a different folder from my old version.? I then created new shortcuts to run the new version.? Somehow during the process it was smart enough to copy over my existing configuration files.? When I opened the new version all of my setups were there.??
?
2- Switched to my QMX+ configuration and tried changing bands and transmitting.? It reported a CAT error every time and wanted me to check setup.? It didn't matter which Radio I was using (TS430, QDC or QMX).
?
2- I didn't do anything with WSJT-x's "Update HamLib" button.? ?Went to GitHub to download the Zip file for v 4.6.2 (Windows 8.1, 64 bit).? Unzipped the downloaded folder and found the LibHamLib-4.DLL file.??
?
3- Copied LibHamLib-4.DLL to the BIN folder of my WSJT-x installation.? But there was no change.? I later discovered that the BIN folder was read only and that the original file was still there.? After changing it to r/w, I copied the DLL file, and now it all works.
?
?
Anyway, as discussed in this thread, the LibHamLib.DLL that is bundled with the latest WSJT-x version is "broken".? Downloading the HamLib Zip file, extracting the LibHamLib-4.DLL, and then copying it into the WSJT-x BIN folder did the trick.
?
Thanks to all for your help; I never would have figured it out on my own.
?
Larry
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Re: QMX/QMX+ internal Transmit Voltage measurement question
On Tue, Apr 15, 2025 at 06:27 AM, Hans Summers wrote:
None of this is involved in the calibration or any issues with calibration.
Thank you for the clarification and description, Hans.
I probably should have left the 'calibration' reference out of my post.
?
What I still don't understand is this:
?- I measure 11.22V at the drain of Q507, while pressing the 'T' key in the diagnostic screen
?- but the voltage displayed in the diagnostic screen is 9.8V, over 1.4V difference.
?- a check of the voltage at ADC_PA, considering the 5.7 voltage divider factor, confirms that the processor should be seeing 11.2V.
?
This measurement discrepancy is repeatable, and present also on my other QMX+.? On my 9V QMX, the difference is proportionally smaller, with 8.4V measured and 7.2V displayed.
?
This discrepancy was misleading to one user, who thought he could safely increase his supply voltage to get a full-range TX voltage.
?
Stan KC7XE
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Re: QMX CW issue, omits dits
Yes as Stan said. There aren't any known issues with the CW keyer. As far as I'm aware the behavior accurately mimics the original Kurtis keyer chip.?
In the early days of QCX there were some problems but these were all resolved early on, in the second half of 2017.?
QMX uses the same keyer code as QCX. But QMX suffered some keyer problems in its early months! The reason in the end, was found to be a race condition in the code. The same code in QCX was also flawed. But the ATmega328 code was never fast enough to win the race against itself. The STM32F446 on the other bands is so fast it races itself occasionally and that caused the glitch. It was a one line code fix but a devil to find that one line! But that was all over a year ago now.?
73 Hans G0UPL
On Tue, Apr 15, 2025 at 06:12 AM, Michael wrote:
Could it be that the processor is not fast enough by handling the paddle input?
Highly unlikely.
I have heard many others report excellent keyer performance, even at higher rates.
And while I'm far from a CW expert, I have never noticed any malfunction of the keyer.
?
So I'm wondering if your particular QMX has some internal issue, like a flaky jack or one of the components.? The dit line in particular is also shared with the mic input, and has an extra capacitor and resistors and the bias voltage for the mic.? If any of these is malfunctioning or 'noisy', it could cause a keyer problem.
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Re: QMX/QMX+ internal Transmit Voltage measurement question
Thanks Tony
I agree, there do appear to be several, or at least one, mystery here. It warrants further investigation. Again though, not related to SSB calibrarion so don't worry about that.?
73 Hans G0UPL
Ugh. Diagnostic screen says 7.5, not 1.75.?
Tony
Here is a link to a photo showing me holding T in the diagnostic screen while displaying the DVM reading at the drain of the modulator.?
The diagnostic screen says 1.75, the DVM says 8.62. Supply is 9 volts from a regulator mounted on the backpanel of the QMX+.
Sorry that it is a little fuzzy. Holding the camera in one hand while pressing a key with the other is a bit of a challenge for my shaky hands.
Tony
AD0VC
You have a point. I measured as I said with key down. But , separately, looked at the TX voltage in the diagnostic screen while holding the T key. I assumed that the two were equivalent TX conditions since both seem to produce full power out. If this is not
the case, that both produce full power, then that would be interesting to know since many of us measure power out using the diagnostic screen.
Tony
AD0VC
Hi Tony
How could you measure in TX Key down with speed zero, if you were in the Diagnostics screen viewing the voltage??
73 Hans G0UPL
On Tue, Apr 15, 2025, 17:51 mux_folder2001 via ?<canthony15= [email protected]> wrote:
I measured during TX, key down with speed set to zero.
Tony
I measured the TX voltage at the drain of the modulator with my DVM during transmit and I get a value within a few tenths of supply. This is in CW mode. But the diagnostic display still says TX voltage is 1.5 volts lower than supply.
Tony
AD0VC
Hi all
The ADC measurement voltage is multiplied in the code by 5.7 (due to the 10 / 47 potential?divider).?
It IS expected that the TX voltage is less than the supply voltage because the code is written this way. The gain of the PA modulator amplifier (Q512, Q513, Q514, Q515, Q507) is expected to be 6.24. When the system measures the
supply voltage, it can therefore calculate what it expects the maximum available PA modulator voltage to be. Or in other words, what DAC value to use for the desired maximum PA voltage. It needs to know?this to get the top of the Blackmann-Harris CW envelope
shaping correct, and for the ALC or CESSB in SSB generation. However there are component tolerances, and the supply voltage?is likely to drop a little further under high load, and for this reason a safety margin is built in, and this is why the TX voltage
is less than the supply voltage.?
During Receive, the PA voltage is just set to the maximum DAC value, this means the PA voltage will be as close as it can get to the supply voltage. This is because we don't need to use that voltage for anything other than to minimize
BS170 vDS capacitance and therefore as far as possible, remove the PA from view during Reception.?
None of this is involved in the calibration or any issues with calibration.
73 Hans G0UPL
Thanks Ludwig, I must have skipped a step in the math...
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Re: QMX CW issue, omits dits
On Tue, Apr 15, 2025 at 06:12 AM, Michael wrote:
Could it be that the processor is not fast enough by handling the paddle input?
Highly unlikely.
I have heard many others report excellent keyer performance, even at higher rates.
And while I'm far from a CW expert, I have never noticed any malfunction of the keyer.
?
So I'm wondering if your particular QMX has some internal issue, like a flaky jack or one of the components.? The dit line in particular is also shared with the mic input, and has an extra capacitor and resistors and the bias voltage for the mic.? If any of these is malfunctioning or 'noisy', it could cause a keyer problem.
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Re: QMX/QMX+ internal Transmit Voltage measurement question
Ugh. Diagnostic screen says 7.5, not 1.75.?
Tony
toggle quoted message
Show quoted text
Here is a link to a photo showing me holding T in the diagnostic screen while displaying the DVM reading at the drain of the modulator.?
The diagnostic screen says 1.75, the DVM says 8.62. Supply is 9 volts from a regulator mounted on the backpanel of the QMX+.
Sorry that it is a little fuzzy. Holding the camera in one hand while pressing a key with the other is a bit of a challenge for my shaky hands.
Tony
AD0VC
You have a point. I measured as I said with key down. But , separately, looked at the TX voltage in the diagnostic screen while holding the T key. I assumed that the two were equivalent TX conditions since both seem to produce full power out. If this is not
the case, that both produce full power, then that would be interesting to know since many of us measure power out using the diagnostic screen.
Tony
AD0VC
Hi Tony
How could you measure in TX Key down with speed zero, if you were in the Diagnostics screen viewing the voltage??
73 Hans G0UPL
On Tue, Apr 15, 2025, 17:51 mux_folder2001 via ?<canthony15= [email protected]> wrote:
I measured during TX, key down with speed set to zero.
Tony
I measured the TX voltage at the drain of the modulator with my DVM during transmit and I get a value within a few tenths of supply. This is in CW mode. But the diagnostic display still says TX voltage is 1.5 volts lower than supply.
Tony
AD0VC
Hi all
The ADC measurement voltage is multiplied in the code by 5.7 (due to the 10 / 47 potential?divider).?
It IS expected that the TX voltage is less than the supply voltage because the code is written this way. The gain of the PA modulator amplifier (Q512, Q513, Q514, Q515, Q507) is expected to be 6.24. When the system measures the
supply voltage, it can therefore calculate what it expects the maximum available PA modulator voltage to be. Or in other words, what DAC value to use for the desired maximum PA voltage. It needs to know?this to get the top of the Blackmann-Harris CW envelope
shaping correct, and for the ALC or CESSB in SSB generation. However there are component tolerances, and the supply voltage?is likely to drop a little further under high load, and for this reason a safety margin is built in, and this is why the TX voltage
is less than the supply voltage.?
During Receive, the PA voltage is just set to the maximum DAC value, this means the PA voltage will be as close as it can get to the supply voltage. This is because we don't need to use that voltage for anything other than to minimize
BS170 vDS capacitance and therefore as far as possible, remove the PA from view during Reception.?
None of this is involved in the calibration or any issues with calibration.
73 Hans G0UPL
Thanks Ludwig, I must have skipped a step in the math...
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Re: QMX/QMX+ internal Transmit Voltage measurement question
Here is a link to a photo showing me holding T in the diagnostic screen while displaying the DVM reading at the drain of the modulator.?
The diagnostic screen says 1.75, the DVM says 8.62. Supply is 9 volts from a regulator mounted on the backpanel of the QMX+.
Sorry that it is a little fuzzy. Holding the camera in one hand while pressing a key with the other is a bit of a challenge for my shaky hands.
Tony
AD0VC
toggle quoted message
Show quoted text
You have a point. I measured as I said with key down. But , separately, looked at the TX voltage in the diagnostic screen while holding the T key. I assumed that the two were equivalent TX conditions since both seem to produce full power out. If this is not
the case, that both produce full power, then that would be interesting to know since many of us measure power out using the diagnostic screen.
Tony
AD0VC
Hi Tony
How could you measure in TX Key down with speed zero, if you were in the Diagnostics screen viewing the voltage??
73 Hans G0UPL
I measured during TX, key down with speed set to zero.
Tony
I measured the TX voltage at the drain of the modulator with my DVM during transmit and I get a value within a few tenths of supply. This is in CW mode. But the diagnostic display still says TX voltage is 1.5 volts lower than supply.
Tony
AD0VC
Hi all
The ADC measurement voltage is multiplied in the code by 5.7 (due to the 10 / 47 potential?divider).?
It IS expected that the TX voltage is less than the supply voltage because the code is written this way. The gain of the PA modulator amplifier (Q512, Q513, Q514, Q515, Q507) is expected to be 6.24. When the system measures the supply voltage, it can therefore
calculate what it expects the maximum available PA modulator voltage to be. Or in other words, what DAC value to use for the desired maximum PA voltage. It needs to know?this to get the top of the Blackmann-Harris CW envelope shaping correct, and for the ALC
or CESSB in SSB generation. However there are component tolerances, and the supply voltage?is likely to drop a little further under high load, and for this reason a safety margin is built in, and this is why the TX voltage is less than the supply voltage.?
During Receive, the PA voltage is just set to the maximum DAC value, this means the PA voltage will be as close as it can get to the supply voltage. This is because we don't need to use that voltage for anything other than to minimize BS170 vDS capacitance
and therefore as far as possible, remove the PA from view during Reception.?
None of this is involved in the calibration or any issues with calibration.
Thanks Ludwig, I must have skipped a step in the math...
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Re: QMX CW issue, omits dits
I have the exact same issue with the cw keying on my QMX+.? I have changed all the variable parameters for the CW keyer to no avail, as it misses dits. I have resorted to using an external K1EL USB keyer, which, of course, works fine with no missing dots.? The key jack is set up for straight keying when using an external keyer.? It would seem that the auto keyer emulation in my radio is the culprit. I have a 9V version and run it using an external INIU Power Bank with a 9V PD cable.? A voltage sag could cause the problem, but it has not bothered me enough to consider looking into the real issue.
73's Joe K8FC
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Jason
James Kvochick
Brien - KE7WB
Ronald Taylor
va3rr
dxradio33