Re: QMX Heated Up, now no output
Just an idea: Maybe there are power-supplies that don't like HF and change (increase) their output-voltage.
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Re: QMX Heated Up, now no output
What type of BUC did you use? imho you are not the first, who's QMX died using a converter.
73, Wolfgang
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Re: Other rotary encoder for QMX and QMX+?
Hi Steve
I added it to my list.?
Harry, tuning the QMX+ from one end of the band to the other is not enjoyable!?
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I have tried a 400ppr encoder with no indentations, but the QMX is unable to keep up.
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Tuning the QMX with a decent encoder would unleash the rig it could be.
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Hans, is there any chance you could speed up the response to the encoder so that a better encoder could be used?
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Steve G4EDG?
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QMX Heated Up, now no output
Using the same power supply (11.8v via BUC converter) and same antenna (Resonant 40m) that had been working for an hour, suddenly the unit quit putting out RF and when I put my hand on it it was very hot.
Disconnected power of course, and verified the SWR was still 1.3 on the 40m antenna.
This is an assembled unit from QRP-Labs.
I've done a reset via the menus, and let it cool overnight, no overheating now, but it's drawing slightly more current (0.12 increase to 0.24) at idle, and doesn't draw anything more at transmit.
I don't know where to start.
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Re: Should I be disappointed?
You are obviously free to go and build what you want, but there is no practical difference on air between 3-4W and 10W. I would get on air and make a few dozen contacts in the time needed to get a 10W amp shipped and delivered.
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My2Cents
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72/73? de Enzo M0KTZ
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Re: QDX Died shortly after arrival
#qdx
Just a hunch...? The BS170s seem to? be the most sensitive, at least to power levels ... maybe heat too. Nothing like FT8 to generate heat.
--
72 de N4REE, Bob Easton - QRP CW forever
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Re: WSJT-X on Raspberry PI 3B and QMX+ unstable
?I run wsjtx and a raspi to my QDX and it started having similar problems. I found wspr would tx ok using my laptop but no longer on the raspi, just a brief transmission. Anyway, I found out that must have been after an update on the raspi, the sound card level was running at 153%. As Hans usually says set tx audio to max, I did not discover for a long while that reducing the tx audio level from the raspi back down to 100% cured the problem.
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73 Ken g4apb?
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Hello Evan,
many thanks for your hints.
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I measured the voltages at the parts you mentioned:
Q4: Gate 7.29 V? (TX 7.34 V)
? ? ? ?Source 14.24 V (TX equal)? (I saw with a loupe that Drain is not connected to pad, I think intentionally?)
R10: 7.29/14.24 V
R11: 0.24/7.29 V
L1: 0.99/1.01 V (TX plus 0.1 V)
L2: 0.24/0.26 V (TX plus 0.1 V)
Q6: Gate 0.24 V
? ? ? ?Drain 0.0 V
? ? ? ?Source 0.0 V (TX 0.14 V)
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Evan, what is ment by "being open" of R10, L10 or Q4?
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Thank you and 73 de Roland
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Re: Should I be disappointed?
toggle quoted message
Show quoted text
On Thu, Dec 26, 2024 at 5:34?AM David Wilcox K8WPE via <Djwilcox01= [email protected]> wrote: Andy,
Thank you for your vote of confidence.? I retired in 2015 after 44 years of showing up for work (meaning family practice in northern Michigan).? And someone even paid me for showing up. In reality I never worked a day in my life.? Every job I had I found a way to make it fun. Ham radio made it enjoyable even in the trying moments.
Doing research in this area (seeing what one’s brain wants to see) would be a neat research topic and I am sure someone has gotten their PhD researching it.? Last night my grandson was searching for a certain part in a mess of Lego pieces.? I looked and didn’t see it either. Then I moved the bunch of pieces around on the table and the hunted piece just jumped out at both of us.? Sometimes a different set of eyes or different lighting or just approaching the search from a different direction or angle makes a difference. Time does too. Coming back tomorrow everything looks different with a rested brain.? Just did a Google AI check and it came back with a very good description of this tooic.
My wife has a different set of eyes and brain connections.? She would have made a good detective. She can walk in a room, do a quick look, and leave and describe every feature.? But she is “interested” in what is in someone’s new home, furniture, or whatever. I see a room, a place to sit down , feel the temperature (I am always cold), and the person I am visiting.? Just re iterating: we see what we are looking for or are interested in.? And the darned grocery companies. They occasionally change the color of the box and that throws me off.? Or move the product to a different shelf or aisle. Really throws me off.
And the big disaster one night. A new Chinese radio (back 10 years or so before they discovered how cheep it was to provide polarity protection). Late at night. Connected the battery power. RED is positive +++++ isn’t it?? Unless the vendor at the swap who sold batteries put a red price sticker at the negative - - - - pole.? Magic smoke and smell produced.? Ha!
Happy New Year to all.? Hope I made some laugh or at least smile.? Remember when we were kids?? We laughed and smiled so often.? My observation is that many of us now find that the stiff tired muscles in our body, especially our faces make it much more difficult to do the same now.? It takes practice. But it spreads like a tired yawn.? And makes everyone involved feel better. (Seen in a family card game last night.) Smiling is GOOD MEDICINE!
Be the REASON someone smiles today.
Dave K8WPE
> On Dec 25, 2024, at 12:02?PM, Andy via <andy.mm0fmf=[email protected]> wrote:
> ?On 25/12/2024 11:04, David Wilcox K8WPE via wrote:
>> There should be a diagnosis title for that condition
>
> Now then Dave, a chance for you to write a scholarly article about this and submit it to The Lancet or such. As a doc, you have the qualifications. Maybe they'll publish it and it can become known as Wilcox Syndrome. ;-)
>
> Andy
>
>
>
>
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Re: Should I be disappointed?
?Andy,
Thank you for your vote of confidence. I retired in 2015 after 44 years of showing up for work (meaning family practice in northern Michigan). And someone even paid me for showing up. In reality I never worked a day in my life. Every job I had I found a way to make it fun. Ham radio made it enjoyable even in the trying moments.
Doing research in this area (seeing what one’s brain wants to see) would be a neat research topic and I am sure someone has gotten their PhD researching it. Last night my grandson was searching for a certain part in a mess of Lego pieces. I looked and didn’t see it either. Then I moved the bunch of pieces around on the table and the hunted piece just jumped out at both of us. Sometimes a different set of eyes or different lighting or just approaching the search from a different direction or angle makes a difference. Time does too. Coming back tomorrow everything looks different with a rested brain. Just did a Google AI check and it came back with a very good description of this tooic.
My wife has a different set of eyes and brain connections. She would have made a good detective. She can walk in a room, do a quick look, and leave and describe every feature. But she is “interested” in what is in someone’s new home, furniture, or whatever. I see a room, a place to sit down , feel the temperature (I am always cold), and the person I am visiting. Just re iterating: we see what we are looking for or are interested in. And the darned grocery companies. They occasionally change the color of the box and that throws me off. Or move the product to a different shelf or aisle. Really throws me off.
And the big disaster one night. A new Chinese radio (back 10 years or so before they discovered how cheep it was to provide polarity protection). Late at night. Connected the battery power. RED is positive +++++ isn’t it? Unless the vendor at the swap who sold batteries put a red price sticker at the negative - - - - pole. Magic smoke and smell produced. Ha!
Happy New Year to all. Hope I made some laugh or at least smile. Remember when we were kids? We laughed and smiled so often. My observation is that many of us now find that the stiff tired muscles in our body, especially our faces make it much more difficult to do the same now. It takes practice. But it spreads like a tired yawn. And makes everyone involved feel better. (Seen in a family card game last night.) Smiling is GOOD MEDICINE!
Be the REASON someone smiles today.
Dave K8WPE
toggle quoted message
Show quoted text
On Dec 25, 2024, at 12:02?PM, Andy via groups.io <andy.mm0fmf@...> wrote:
?On 25/12/2024 11:04, David Wilcox K8WPE via groups.io wrote:
There should be a diagnosis title for that condition Now then Dave, a chance for you to write a scholarly article about this and submit it to The Lancet or such. As a doc, you have the qualifications. Maybe they'll publish it and it can become known as Wilcox Syndrome. ;-)
Andy
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Hi Daniel,
?
fully agree. The higher temperature requirement can be problematic.
When I'm soldering connectors I also open my secret drawer with the remaining 60/40, to avoid melting structural parts.
Nevertheless, lead free is now my main solder.
As I mentioned above this required a reasonable soldering station (and gave me a reason to buy one) and some trials for a good solder.
Furthermore you have to close your eyes at the checkout when ordering fresh Sn95,5Ag3,8Cu0,7...
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73
?
DK7CVD
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Re: WSJT-X on Raspberry PI 3B and QMX+ unstable
I would check the USB cable, I have come across cables with poor shielding, i.e. they catch/are affected by RF.
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Re: QMX 60-15M kit order?
Hello Brien
Powdered iron cores, nor ferrite ;-)? ? But everything is here now, no more problems, and we are preparing all the pending orders that were waiting on T37-6 or sticky feet. I updated the status page with this information.?
There were 162 pending orders, we started catching up on them yesterday, and it will take a few days to clear the backlog.?
Has anyone recently received their QMX 60-15M kit order?? The last update, December 9th, on QRP Labs website said they were short ferrite cores which were expected December 13th.? No updates since then.?
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Brien - KE7WB?
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Has anyone recently received their QMX 60-15M kit order?? The last update, December 9th, on QRP Labs website said they were short ferrite cores which were expected December 13th.? No updates since then.?
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Brien - KE7WB?
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Dirk,
?agree, the Sn95,5Ag3,8Cu0,7 ( I use a Kester product) works well. However you do have to use higher heat. I have used the lead free for a lot of projects, but for the QMX I went back to 60/40 Pb based due to the heat issues with a 6 layer board.?
--
73, Dan? NM3A
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As of 2021 the US Army, at least, requires 3% minimum lead content in solder to prevent whisker formation.
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https://www.psmagazine.army.mil/News/Article/2567624/get-the-lead-outnot/
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
l think a lot of us missed out on the first group buy.? Would you (Cal and Stan) be willing to do another group buy if we can get 10 more folks to commit???
--
Dale Hardin
KS4NS
Elberta, AL
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merry Xmas and a happy new year...?
vy 73 de Udo DF4BJ?
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
If a second group buy is made I would get one
As far as I know the first group buy is closed, participants paid their shares and are in the process of getting their kits.
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The best way is to contact Cal (AD8Q) and Stan (KC7XE) by email.
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You can find more group buy discussion (although it is quite outdated at this point) in this thread:
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--
73,
Sardar (AC8L, 4K6SA, VA3DUA).
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Rico, please read the QRP Labs Wiki document about the PCM1804.
ADC I/Q shows no real RX signal but strong noise. The most probable place for this noise is the PCM1804 itselve.
To check this please follow the Wiki doc.
73 Ludwig
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N4REE - Bob
Roland OE5ARN
David Wilcox K8WPE
Dirk
Brien - KE7WB
Chuck AI7SY
Dale Hardin KS4NS
Udo Die?elberg DF4BJ