开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. QRPLabs
  2. Messages
Expanded Topics Messages Polls
Date
Re: QMX + Backlight dimming

 

Maybe you can replace R306 (33 ohm) on the front panel board with a small 100 ohm pot to adjust the brightness. I was thinking of doing it for my QMX (not plus) not necessarily for the brightness but for minimizing the current consumption from the backlight.

73,
Yoon KM6KJI
Re: QMX+ Power Increasing Question

 

Thanks Hans, a self calibration feature would be great. My QMX+ is just under 1W on 6m and I would like a bit more, that is quite a lot under spec..

Thanks for all your efforts..

73 Dave G4FAW?
QMX + Backlight dimming

 

Does anyone have an easy safe method of dimming the backlight on the QMX+
Perhaps changing/adding a resistor.
The bright backlight is fine in a well let room or outdoors but in my dimly lit
bat/ham cave it’s hard on the eyes.
Thanks, Dave
Re: #qmx #firmware 1_00_020 released: minor stuff and bug fixes #qmx #firmware

 

Thanks Geoff

I fixed it?

73 Hans G0UPL


On Thu, Jul 11, 2024, 22:29 Geoffrey E. Gallaway via <geoffeg=[email protected]> wrote:
Thanks Hans,

Always love seeing new firmware releases. Just a note that the href link to the operating manual on the QMX page is still to the 1_00_018 PDF even though the link description says it points to the 1_00_020 PDF.

73s,
Geoff
KC8FDU

On Thu, Jul 11, 2024, at 13:17, Hans Summers wrote:
> Hi all
>
> I released firmware 1_00_020 for QMX and QMX+ which you can download at
> and there is also an updated operating manual for
> this version.
>
> Please note, this is a minor release, and I hope it will not draw too much
> criticism of what has and what has not been included; I just wanted to get
> the documentation up to date (1_00_019 was missing an operating manual) and
> clear up a few things that several people had identified as urgent or were
> very simple or I had done already in the last few weeks. The new "Test ADC
> I/Q" tool is also a useful diagnostic aid.
>
> As always: if it is not in this list, it has not been done; so no need to
> point out all the things that are wrong that are NOT in this list, if it
> has been mentioned on this forum already it means it is most likely already
> on my ToDo list. And I do know some bugs will be
> particularly bothering particular people... and aren't solved yet... and
> that will surely disappoint someone. So I have my asbestos on... But at
> least, let's tick off a few things and keep the ball rolling.
>
> And do please rest assured: SSB is the current main priority - and now
> Dayton and Friedrichshafen are out of the way, this will be my focus.
>
> *1. New Test ADC I/Q tool shows baseband I/Q samples, aiding diagnostics*
> Useful tool that shows a 750Hz sinewave cycle at baseband, and if it is
> correct, clean and shows correct 90-degree I Q phase, it verifies the
> receiver front end is working properly. If NOT, then it could give
> indications of other issues, in conjunction with other evidence; please see
> the operating manual at page 83 for a full description.
>
> *2. Add 20dB of attenuation in earphones when in Digi mode (equalize volume
> to CW)*
> Stops you being accidentally deafened if you change from CW mode to Digi by
> mistake. Surely there must be some way to calculate given a bandwidth
> difference, what the perceived volume difference would be... in the absence
> of having a sufficiently functional cerebral cortex I just found that 20dB
> sounds a lot better than nothing at all.
>
> *3. Remove the experimental "SuppressThump" setting which is now always on*
> I see no reason to not use SuppressThump, so the setting is now gone and
> the thing it did, is now always done.
>
> *4. Configure AGC defaults on factory reset (or new installation)*
> AGC (CW mode) is now on by default (after factory reset or on a fresh QMX)
> and the settings of the video set up by
> default, except for Sample Blocks which is set to 2.
>
> *5. Bug fix: Display leftovers on GPS display on LCD*
>
> *6. Bug fix: RF, AF and Image Sweep tools didn't work unless in VFO Mode A
> already*
>
> *7. Bug fix: Selecting a preset did not change the LPF selection, only the
> VFO*
> Now it selects the appropriate band and filters selection, so this should
> solve some danger, when using presets...
>
> *8. Bug fix: LPF and SWR sweep screens broke if not all bands were enabled*
> Now fixed...
>
> *9. Bug fix: CAT bug, remove \0 character in AG; command response*
>
> *10. Bug fix: CAT bug, in IF command (1 character too long)*
>
> *11. Bug fix: CAT bug, remove \0 character in TM; command response*
>
> *12. Bug fix: Change minimum frequency from 3.2 MHz to 1.5 MHz*
> So now 160m receive should work BUT - note that I have not fixed up the
> correct 90-degree phase on 160m, and this means that there isn't any image
> rejection on 160m and also sensitivity will be a bit lower than it should
> be.
>
> Note also the description of the CPU Utilisation monitor is now also in the
> operating manual, at page 102.
>
> 73 Hans G0UPL
>
>
>
>
>

--
Sent from my email client.
Re: #qmx #firmware 1_00_020 released: minor stuff and bug fixes #qmx #firmware

 

开云体育

Just tried this. After update, CW sidetone clicks like crazy. I had to set "S9 sounds like" to 9. It was at zero.

Tony
AD0VC


From: [email protected] <[email protected]> on behalf of Hans Summers <hans.summers@...>
Sent: Thursday, July 11, 2024 12:17 PM
To: [email protected] Notification <[email protected]>
Subject: [QRPLabs] #qmx #firmware 1_00_020 released: minor stuff and bug fixes
?
Hi all

I released firmware 1_00_020 for QMX and QMX+ which you can download at and there is also an updated operating manual for this version.?

Please note, this is a minor release, and I hope it will not draw too much criticism of what has and what has not been included; I just wanted to get the documentation up to date (1_00_019 was missing an operating manual) and clear up a few things that several people had identified as urgent or were very simple or I had done already in the last few weeks. The new "Test ADC I/Q" tool is also a useful diagnostic aid.?

As always: if it is not in this list, it has not been done; so no need to point out all the things that are wrong that are NOT in this list, if it has been mentioned on this forum already it means it is most likely already on my ToDo list. And I do know some bugs will be particularly?bothering?particular people... and aren't solved yet... and that will surely disappoint someone. So I have my asbestos on... But at least, let's tick off a few things and keep the ball rolling.?

And do please rest assured: SSB is the current main priority - and now Dayton and Friedrichshafen are out of the way, this will be my focus.?

1. New Test ADC I/Q tool shows baseband I/Q samples, aiding diagnostics
Useful tool that shows a 750Hz sinewave cycle at baseband, and if it is correct, clean and shows correct 90-degree I Q phase, it verifies the receiver front end is working properly. If NOT, then it could give indications of other issues, in conjunction with other evidence; please see the operating manual at page 83 for a full description.?

2. Add 20dB of attenuation in earphones when in Digi mode (equalize volume to CW)
Stops you being accidentally deafened if you change from CW mode to Digi by mistake. Surely there must be some way to calculate given a bandwidth difference, what the perceived volume difference would be... in the absence of having a sufficiently functional cerebral cortex I just found that 20dB sounds a lot better than nothing at all.?

3. Remove the experimental "SuppressThump" setting which is now always on
I see no reason to not use SuppressThump, so the setting is now gone and the thing it did, is now always done.?

4. Configure AGC defaults on factory reset (or new installation)
AGC (CW mode) is now on by default (after factory reset or on a fresh QMX) and the settings of the video? set up by default, except for Sample Blocks which is set to 2.?

5. Bug fix: Display leftovers on GPS display on LCD

6. Bug fix: RF, AF and Image Sweep tools didn't work unless in VFO Mode A already

7. Bug fix: Selecting a preset did not change the LPF selection, only the VFO
Now it selects the appropriate band and filters selection, so this should solve some danger, when using presets...?

8. Bug fix: LPF and SWR sweep screens broke if not all bands were enabled
Now fixed...?

9. Bug fix: CAT bug, remove \0 character in AG; command response

10. Bug fix: CAT bug, in IF command (1 character too long)

11. Bug fix: CAT bug, remove \0 character in TM; command response

12. Bug fix: Change minimum frequency from 3.2 MHz to 1.5 MHz
So now 160m receive should work BUT - note that I have not fixed up the correct 90-degree phase on 160m, and this means that there isn't any image rejection on 160m and also sensitivity will be a bit lower than it should be.?

Note also the description of the CPU Utilisation monitor is now also in the operating manual, at page 102.

73 Hans G0UPL
Re: #qmx #firmware 1_00_020 released: minor stuff and bug fixes #qmx #firmware

 

Thanks Hans,

Always love seeing new firmware releases. Just a note that the href link to the operating manual on the QMX page is still to the 1_00_018 PDF even though the link description says it points to the 1_00_020 PDF.

73s,
Geoff
KC8FDU

On Thu, Jul 11, 2024, at 13:17, Hans Summers wrote:
Hi all

I released firmware 1_00_020 for QMX and QMX+ which you can download at
and there is also an updated operating manual for
this version.

Please note, this is a minor release, and I hope it will not draw too much
criticism of what has and what has not been included; I just wanted to get
the documentation up to date (1_00_019 was missing an operating manual) and
clear up a few things that several people had identified as urgent or were
very simple or I had done already in the last few weeks. The new "Test ADC
I/Q" tool is also a useful diagnostic aid.

As always: if it is not in this list, it has not been done; so no need to
point out all the things that are wrong that are NOT in this list, if it
has been mentioned on this forum already it means it is most likely already
on my ToDo list. And I do know some bugs will be
particularly bothering particular people... and aren't solved yet... and
that will surely disappoint someone. So I have my asbestos on... But at
least, let's tick off a few things and keep the ball rolling.

And do please rest assured: SSB is the current main priority - and now
Dayton and Friedrichshafen are out of the way, this will be my focus.

*1. New Test ADC I/Q tool shows baseband I/Q samples, aiding diagnostics*
Useful tool that shows a 750Hz sinewave cycle at baseband, and if it is
correct, clean and shows correct 90-degree I Q phase, it verifies the
receiver front end is working properly. If NOT, then it could give
indications of other issues, in conjunction with other evidence; please see
the operating manual at page 83 for a full description.

*2. Add 20dB of attenuation in earphones when in Digi mode (equalize volume
to CW)*
Stops you being accidentally deafened if you change from CW mode to Digi by
mistake. Surely there must be some way to calculate given a bandwidth
difference, what the perceived volume difference would be... in the absence
of having a sufficiently functional cerebral cortex I just found that 20dB
sounds a lot better than nothing at all.

*3. Remove the experimental "SuppressThump" setting which is now always on*
I see no reason to not use SuppressThump, so the setting is now gone and
the thing it did, is now always done.

*4. Configure AGC defaults on factory reset (or new installation)*
AGC (CW mode) is now on by default (after factory reset or on a fresh QMX)
and the settings of the video set up by
default, except for Sample Blocks which is set to 2.

*5. Bug fix: Display leftovers on GPS display on LCD*

*6. Bug fix: RF, AF and Image Sweep tools didn't work unless in VFO Mode A
already*

*7. Bug fix: Selecting a preset did not change the LPF selection, only the
VFO*
Now it selects the appropriate band and filters selection, so this should
solve some danger, when using presets...

*8. Bug fix: LPF and SWR sweep screens broke if not all bands were enabled*
Now fixed...

*9. Bug fix: CAT bug, remove \0 character in AG; command response*

*10. Bug fix: CAT bug, in IF command (1 character too long)*

*11. Bug fix: CAT bug, remove \0 character in TM; command response*

*12. Bug fix: Change minimum frequency from 3.2 MHz to 1.5 MHz*
So now 160m receive should work BUT - note that I have not fixed up the
correct 90-degree phase on 160m, and this means that there isn't any image
rejection on 160m and also sensitivity will be a bit lower than it should
be.

Note also the description of the CPU Utilisation monitor is now also in the
operating manual, at page 102.

73 Hans G0UPL




--
Sent from my email client.
Re: RSGB Tonight at 8 video - going for record?

 

2.5K views now
Re: newby mistake,

 

My only concern about using a drill is with multi-layer circuit boards, it might be possible to disconnect the through hole connections.
Dean - KC9REN


On Wed, Jul 10, 2024 at 06:18 AM, David Wilcox K8WPE wrote:
Bill,
?
I have had some criticism for drilling out the left over solder in a through hole opening but I have done it for years (not too many times though). I am just an old Osteopathic family doctor but have used a finger drill and the very fine bits with success. ?I was warned about drilling out the through hole plating but just added a little solder on both sides of the board. ?The few times I had to do that it did work…. So go drill! ?I would like to see what a “half” bit looks like…. Have had one root canal done but wasn't interested in the tools that day. Ha!

Be the REASON someone smiles today.
?
Dave K8WPE
?
?
QCX Mini WSPR Without a GPS

 

While waiting for cables to arrive to hook up my QLG2 to my 30 meter QCX Mini, I tried WSPR absent a GPS in line to lock the clock.

I set the clock manually via the onboard QCX Mini menu by watching the seconds tick up to a minute on my Ham Clock.

Much to my surprise, it worked well, prompting me to wonder what may change once the GPS is connected.

Here's the map with results last evening, in case others wish to experiment.

73,??

Bill -- W3WJ
Re: #qmx #firmware 1_00_020 released: minor stuff and bug fixes #qmx #firmware

 

Thank you Hans!? I've been greatly enjoying my QMX+!? :-)
#qmx #firmware 1_00_020 released: minor stuff and bug fixes #qmx #firmware

 

Hi all

I released firmware 1_00_020 for QMX and QMX+ which you can download at and there is also an updated operating manual for this version.?

Please note, this is a minor release, and I hope it will not draw too much criticism of what has and what has not been included; I just wanted to get the documentation up to date (1_00_019 was missing an operating manual) and clear up a few things that several people had identified as urgent or were very simple or I had done already in the last few weeks. The new "Test ADC I/Q" tool is also a useful diagnostic aid.?

As always: if it is not in this list, it has not been done; so no need to point out all the things that are wrong that are NOT in this list, if it has been mentioned on this forum already it means it is most likely already on my ToDo list. And I do know some bugs will be particularly?bothering?particular people... and aren't solved yet... and that will surely disappoint someone. So I have my asbestos on... But at least, let's tick off a few things and keep the ball rolling.?

And do please rest assured: SSB is the current main priority - and now Dayton and Friedrichshafen are out of the way, this will be my focus.?

1. New Test ADC I/Q tool shows baseband I/Q samples, aiding diagnostics
Useful tool that shows a 750Hz sinewave cycle at baseband, and if it is correct, clean and shows correct 90-degree I Q phase, it verifies the receiver front end is working properly. If NOT, then it could give indications of other issues, in conjunction with other evidence; please see the operating manual at page 83 for a full description.?

2. Add 20dB of attenuation in earphones when in Digi mode (equalize volume to CW)
Stops you being accidentally deafened if you change from CW mode to Digi by mistake. Surely there must be some way to calculate given a bandwidth difference, what the perceived volume difference would be... in the absence of having a sufficiently functional cerebral cortex I just found that 20dB sounds a lot better than nothing at all.?

3. Remove the experimental "SuppressThump" setting which is now always on
I see no reason to not use SuppressThump, so the setting is now gone and the thing it did, is now always done.?

4. Configure AGC defaults on factory reset (or new installation)
AGC (CW mode) is now on by default (after factory reset or on a fresh QMX) and the settings of the video? set up by default, except for Sample Blocks which is set to 2.?

5. Bug fix: Display leftovers on GPS display on LCD

6. Bug fix: RF, AF and Image Sweep tools didn't work unless in VFO Mode A already

7. Bug fix: Selecting a preset did not change the LPF selection, only the VFO
Now it selects the appropriate band and filters selection, so this should solve some danger, when using presets...?

8. Bug fix: LPF and SWR sweep screens broke if not all bands were enabled
Now fixed...?

9. Bug fix: CAT bug, remove \0 character in AG; command response

10. Bug fix: CAT bug, in IF command (1 character too long)

11. Bug fix: CAT bug, remove \0 character in TM; command response

12. Bug fix: Change minimum frequency from 3.2 MHz to 1.5 MHz
So now 160m receive should work BUT - note that I have not fixed up the correct 90-degree phase on 160m, and this means that there isn't any image rejection on 160m and also sensitivity will be a bit lower than it should be.?

Note also the description of the CPU Utilisation monitor is now also in the operating manual, at page 102.

73 Hans G0UPL
Re: QMX Rocks!

 

I agree 100%. It's a ton of fun and surprising the amount of DX that is possible given the conditions and the power of FT8. Since mid-May I have worked 23 countries and completed the 13 Colonies clean sweep (plus UK, but missed FR) - all on a 20m/17m homemade fan dipole.

Amazing little radio and I am looking forward to expanded functionality through firmware.

Thanks Hans!
Re: Special considerations when sourcing replacement capacitors? #qmx

 

I also had a bundle of caps in my drawer, but I decided it was best to buy the right ones,

Look at

See comment in this thread /g/QRPLabs/message/123779 from Hans

Mark
W8GU
Re: QMX+ audio amp/speakers

 

Thanks for your reply Dan. I had considered shielding but before doing that I decided to take the time to run all of the diagnostic sweeps on all bands with and without the speakers sitting on the Dev board and I'm happy to report that the speakers make absolutely no difference in the sweep results.
So on with the show.
--
Randy, N4OPI
QMX Rocks!

 

I've been using my mid-band QMX for several weeks on CW and FT8 (mostly CW) and have had a lot of success, the majority of my QSOs coming with US stations. But today I ventured up to 15 meter CW and was pleasantly surprised to be able to work DL6MHG and OM3CW. I've got to say, working Europe from the US west coast with four watts into a relatively low (27 feet high) end fed long wire Inverted Vee was a real treat for me.

Hans - thanks for designing and making these cool little radios available to us!
--
Jim / K7TXA
Eagle, ID

SKCC 10447T
BUG 301
Re: Special considerations when sourcing replacement capacitors? #qmx

 

开云体育


Sent fromj my iPhone

Re: My QMX+ has a .3 ohm short on VDD

 

Dear David,

Board tapping is a good method in finding an intermittent connection sometimes. I have done this with some success in the past. You might help narrow down the area using a narrow insulated “tapper” instead of a finger, like (for example) a chopstick. Then you can nudge various components individually or board areas until you find it.?

I think you are getting close.

73,
Gregg W7GRM

Re: Defective PCM1804

 

开云体育

Most devices are tested at the die stage of manufacture, but not many devices are 100% tested after packaging.? ?Over 50 years of designing and have pcb assemblies made, the failure rates are extremely low.?

Sent from

From: [email protected] <[email protected]> on behalf of Chuck AI7SY <chuck@...>
Sent: Thursday, July 11, 2024 3:16:56 PM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] Defective PCM1804
?
Wolfgang Pauli once said to Niels Bohr after a lecture "Your idea is crazy, but is it crazy enough?".

My kit arrived Monday, and I've been finishing a 1.25m repeater before starting (think of a horse hanging their own carrot on a stick), but I opened the box to examine the packaging.

It would seem to be difficult to damage the chip once it's mounted on a board with ~1000 uf of bypassing. TI puts its usual 2 kV input static protection on this chip. So one has to work some to break the thing.

Hans, if you don't see such a problem with the QRP Labs assembly crew, I would posit that the issue could be static buildup inside the packaging, during shipping. Every little jostle rubbing the bubble wrap on the cardboard...

A possible solution could be as simple as antistatic bagging the main board for shipping.

Re: Defective PCM1804

 

That leaves me one idea to explore, but I'll have to build the kit and measure transients to check it.

Re: My QMX+ has a .3 ohm short on VDD

 

Dear Greg.
My resistance measurement comes and goes.... when it isn't .4 ohms it is about 2.4kohms... tapping the board makes it change.? I have gone back to the work bench and rechecked some solder joints... But so far I have not been able to locate the joint that is either shorting to to something or something internal in the board is shorting it out.? It is a 5 layer board and? may be having an internal short in there.?? With the type of construction that is very unlikely but may be possible.?? My original software load may have been compromised by the board shorting during the upload.? So I may try to manually redo it when the shorts are not there..? (neat trick if I can pull it off)? the first upload may have been interrupted.? Ludwig sent me so really good information that I didn't know existed on how this all works.? What I see is the 3.3 regulated is on the linear regulator and the 5V is High on the diagnostic but read 4.6 or 4.8 on my meter when I test it externally.? I am running on a 8V reduced voltage and going to stay that way until I can find the short on the 3.3v supply.... or at least get the 3.3V up on the? SMS power supply.?? Lots of things to check and a busy day today.?

Take care and have fun.?? Thanks for the hints.
73 Dave WA5DJJ

16601 - 16620 of 140557