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Re: QMX+ rev 3 freezes shortly after boot
On Thu, Apr 3, 2025 at 02:17 PM, @Ludwig_DH8WN wrote:
Actually, now that you mention it, I am getting some strange power readings across all the bands, and my SWR readings are all over the place, even with dummy load & a tuned antenna. ?
Here's my power readings from diagnostics:
160m -> 4W
?80m -> 0.8W
?60m -> 1.6W
?40m -> 0.2W
?30m -> 0.0W
?20m -> 0.0W
(the rest) -> 0.0W
?
I'm assuming that means I've got something wrong in one of my toroids, is that a correct understanding? |
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Another QMX+ became SSB capable
开云体育Kudos to Hans - the beta was well worth the wait!Thanks again to the folks that helped me earlier this year locate and replace the bad switch. I had not used the little beast that much after confirming the repair, mostly due to time commitments. Did get some good reports on CW, then shelved it until firmware beta 1-01-003 that covered SSB was dropped. The firmware upgrade was straight forward. I constructed two Mic adapters, one for a spare ICOM HM-219 and one for a Heil ProSet Elite iC. Both worked well without adjustments of any kind. First voice QSO was this afternoon on 40M with VA3XV up in Ontario (about 400+ miles). He reported the audio to be as very nice, as good as my 7610. The QMX+ even received a 54 sig report when the QSB and adjacent frequency QRM was not present. Next up configuring it for fldigi - FSQ and other digital modes... and of course portable ops. So far this has proved an excellent and surprisingly full featured little rig. --
Jack Spitznagel KD4IZ FM19oo Parkton, MD |
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Re: QMX+ SWR sweeps with SSB firmware?
开云体育
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
?
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Re: QMX+ SWR sweeps with SSB firmware?
开云体育
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
?
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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! |
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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 |
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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.? |
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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 |
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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 |
Michael Shiplet
Jack Spitznagel (KD4IZ)
Bruce Akhurst
Braden Glett
Donald S Brant Jr