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Re: QMX+ Power Output Question

 

You might check to ensure that you have not spoiled the harmonic suppression in the process.?
Hopefully the increased power is not due to harmonics also getting through; the presence of harmonic energy will cause inflated readings on a diode-based power measurement. ?
Thermistor-based power sensors (HP 848x for example) do not exhibit this effect and measure true RMS power which is why I prefer them.
73, Don N2VGU
When I did the initial LPF sweeps I noticed that filters were attenuating the signal within some of the bands.? Adjusting the spacing of the turns on the coils made little difference.? Backing off a turn on the coils for the appropriate LPFs moved the attenuation outside of the band.? The filters are still fully attenuating the second harmonic and above.

Hans posted a video on this process for the QCX+
--
Steve KA0SM
Re: QMX+ SWR sweeps with SSB firmware?

 

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Hmm. I just watched the external SWR meter during the "sweep" and it holds steady also. It is clearly not actually sweeping for some reason.

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of mux_folder2001 via groups.io <canthony15@...>
Sent: Thursday, April 3, 2025 2:51 PM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
Thanks Chris, that is pretty much what I expected to see with my 6BTV. It's weird that mine seems to report the correct SWR for the band I select (as compared to my external SWR meter) but it shows it as being the same for all frequencies.? Maybe there is something in my band configuration settings that is not right.

Tony
AD0VC
From: [email protected] <[email protected]> on behalf of Chris <chris.rowland@...>
Sent: Thursday, April 3, 2025 2:45 PM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
Just ran a SWR sweep on a QMX+ running 1_01_003 into a Cobweb and got this:
It seems to be reporting about correctly, The Cobweb is designed for 20, 17, 21, 24 and 28m.
?
Chris, G5CTH
?
Re: QMX+ SWR sweeps with SSB firmware?

 

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Thanks Chris, that is pretty much what I expected to see with my 6BTV. It's weird that mine seems to report the correct SWR for the band I select (as compared to my external SWR meter) but it shows it as being the same for all frequencies.? Maybe there is something in my band configuration settings that is not right.

Tony
AD0VC

From: [email protected] <[email protected]> on behalf of Chris <chris.rowland@...>
Sent: Thursday, April 3, 2025 2:45 PM
To: [email protected] <[email protected]>
Subject: Re: [QRPLabs] QMX+ SWR sweeps with SSB firmware?
?
Just ran a SWR sweep on a QMX+ running 1_01_003 into a Cobweb and got this:
It seems to be reporting about correctly, The Cobweb is designed for 20, 17, 21, 24 and 28m.
?
Chris, G5CTH
?
Re: QMX SMPS issues, and a possible cure

 

Don (aka El Destructo),

Can you move that file at 700,000 files per second? Lol… your job sounds like a ton of fun. Hope you’re using the proper PPE. :-)

Tony AC9QY

On Thu, Apr 3, 2025 at 3:19?PM Donald S Brant Jr via <dsbrantjr=[email protected]> wrote:
From the readme:? "Behaves well when output is suddenly shorted and then the short is removed."??
Try this:
The most brutal power supply torture test I saw was to connect the supply output with heavy leads to two 3/8" copper bolts closely spaced in an insulating block.
Energize the supply, then take a coarse file and file the ends of the bolts simultaneously.??
Watch the sparks fly and monitor the supply for instabilities.? The fast, random short/open transitions, with bonus negative-resistance arcs, will challenge any control loop.
I love getting paid to do stuff like that.
73, Don N2VGU
Re: QMX+ SWR sweeps with SSB firmware?

 

Just ran a SWR sweep on a QMX+ running 1_01_003 into a Cobweb and got this:
It seems to be reporting about correctly, The Cobweb is designed for 20, 17, 21, 24 and 28m.
?
Chris, G5CTH
?
Re: Gibberish characters appended onto end of Message 1

 

By the way, I should clarify that when you look at Message 1 in text form, the gibberish characters do not appear. They only appear as the message is being sent on the air, and they are sent. The couple of times I dared to send Message 1 yesterday, I got the same characters added on at the end, which are: K0****AS
Best regards to all and 73!
Re: RTC battery mistake

 

The QMX+ operation manual that I saw is for the regular QMX. Do you have access to a different one? For instance, the diagrams of the front and (I think) rear panels are laid out differently. I understand now that the QMX+ and the regular QMX manuals are largely the same other than the diagram.
Just to clarify, I ordered a preassembled QMX+ and so didn't think I had any reason to download the assembly manual. I now understand that that may not be the case.
Thank you all for your input! 73
Re: Gibberish characters appended onto end of Message 1

 

Jon, also, a couple of things I discovered playing around with this:
1. I deleted Message 1 and re-entered it, but I still got gibberish;
2. I discovered that Message 2 did not add gibberish on the end, as Message 1 consistently does.?
Ghost in the machine.?
Re: QMX+ Power Output Question

 

Sure hope that's it for you too.?

Greg


On Thu, Apr 3, 2025 at 3:35 PM, secondchancesailor via groups.io
<jagillaspie@...> wrote:
Greg, Funny you should mention that!? One of the last things I did before everything stopped working was to install the latest version of FLDigi.? ?I didn't know about the hidden zombies, will check that next time I get a chance.? Thanks for the tip!
?
Jim (w8ykg)
Re: Gibberish characters appended onto end of Message 1

 

I assume you could use the practice mode, and you wouldn't be transmitting.
Re: QMX Display Brightness

 

You can buy screen dimming adhesive film on Amazon for $12.
Re: QMX SMPS issues, and a possible cure

 

From the readme:? "Behaves well when output is suddenly shorted and then the short is removed."??
Try this:
The most brutal power supply torture test I saw was to connect the supply output with heavy leads to two 3/8" copper bolts closely spaced in an insulating block.
Energize the supply, then take a coarse file and file the ends of the bolts simultaneously.??
Watch the sparks fly and monitor the supply for instabilities. ?The fast, random short/open transitions, with bonus negative-resistance arcs, will challenge any control loop.
I love getting paid to do stuff like that.
73, Don N2VGU
Re: QMX+ rev 3 freezes shortly after boot

 

Michael,
?
that's a good message. But honestly I have no clue how your work could repair your problem. Maybe during your work you unknowledgeable removed a tiny metal piece.
?
I hope the problem never comes back.
?
and it looks like I'm getting about 0.1W on 20m
Let us know if you need some help.
?
73 Ludwig
?
Re: VFO A and B

 

I can't see any error in the related CAT commands on QMX (FA, FB, FR, FT).? They operate as described in the manual, and as the basic use of them is described in the Kenwood definitions.? But as noted in QMX operations guide, the way Kenwood does Split mode does not correspond exactly to the way QMX uses the VFOs, so the logging software may be doing something incompatible with QMX.
?
You can see the exact CAT commands your logging software is sending, if you want, by using the terminal menu, and selecting 'PC and CAT' and then 'Log file'.? In that screen, hit 'A' to enable logging all commands.? Then exit the QMX terminal and use your logging software, then come back to the 'Log file' screen to see the commands issued.? All lines with a ';' are from CAT, ones without a ';' are QMX internal logs noting mode changes, etc.
?
Stan KC7XE
Re: QMX+ Power Output Question

 

On Thu, Apr 3, 2025 at 11:50 AM, Steve M wrote:
I had to do that on my QMX+ to keep the LPFs from reducing my output on the higher bands.?
You might check to ensure that you have not spoiled the harmonic suppression in the process.?
Hopefully the increased power is not due to harmonics also getting through; the presence of harmonic energy will cause inflated readings on a diode-based power measurement.??
Thermistor-based power sensors (HP 848x for example) do not exhibit this effect and measure true RMS power which is why I prefer them.
73, Don N2VGU
Re: QMX+ Power Output Question

 

Hi Steve,? I haven't done the LPF sweeps because I really don't know what I'm looking at when I get there.? ?I'll take a look and see if I can make any sense out of it.? Thanks for the suggestion!
?
Jim (w8ykg)
Re: QMX+ Power Output Question

 

Greg, Funny you should mention that!? One of the last things I did before everything stopped working was to install the latest version of FLDigi.? ?I didn't know about the hidden zombies, will check that next time I get a chance.? Thanks for the tip!
?
Jim (w8ykg)
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

I just got this one and it's the best so far, better than my trusty Retevis speaker-mic and also better than the original speaker mic of my Kenwood TH-D72E in terms of noise / sensitivity / required QMX gain: /g/QRPLabs/wiki/39099
?
73, Andreas
Wiki Page: QMX External Microphone Options #wiki-notice

Group Notification
 

The wiki page QMX External Microphone Options has been created by Andreas DM7AK <mail2dm7ak@...>.

Re: QMX Display Brightness

 

Around 800 ohm worked best for me.
Dave
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