Re: Internal battery for QMX+
Yes, I will demo Necati's nice board for battery and speaker at my booth.?
73 Hans G0UPL
Hiroki,
If you will go to Dayton, Hans has got Mustafa's battery board installed in his QMX+, I am told.
12 May 2025 Pzt 16:15 tarihinde ta2rx bekir via <ta2rx.bekir= [email protected]> ?unu yazd?:
Has anyone installed a rechargeable battery in the QMX+? If so, would you share the details, such as what brand of? battery and how you wired it inside the QMX+ case? Thanks.
Hiroki AH6CY
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My computer skills aren't stellar so I apologize if this should be a new topic rather than a reply.? I am having difficulty understanding how to connect an external electret condenser mic to my completed QMX+.? I understand that the ring in the jack is connected to both the mic input and through a 2.2K resistor to a 3.3V supply.? It would seem to be as simple as connecting both the mic connection from the mic and the connection to supply power to the mic to the ring on the plug.? My first attempt was with no connection to the supply power to the mic and I found that if I shouted loudly enough I could indeed generate a small RF output, I even made a very difficult contact!? Arranging to connect the power connection to the ring I find that the PTT is engaged when that connection is made.? The mic I am working with is from my junk bin and I am almost certain that it at one time functioned as expected with a TS-940, 850, or 950 radio.? I am preparing to connect an external DC supply to the mic, no power to the QMX+ other than back through the mic itself.? Alternative is to purchase another mic of known specifications bit I would have the same wiring question.? Any direction from those more knowledgeable would be greatly appreciated!? A wonderful project and I am expecting the final card played will yield a wonderful radio.? Thanks to Hans and all those participating!
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#QMX - dim backlight remains when backlight turned off
#qmx
I had posted about this in the past regarding my rev4 QMX ( /g/QRPLabs/message/127055) but I still haven't been able to resolve this issue. ?
Essentially, when the backlight is turned OFF in the display settings, the LED is still dimly lit. Could this be a failed BSS123 transistor (Q301)? The radio otherwise functions normally. I'm not sure what else would cause this, so any tips would be greatly appreciated!
?
--
73
Andrew KI7FXL
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Re: Rev 1 vs. Rev 3 QMX Kit?
Hi Mike, all
The SMPS step issue wasn't quite the same thing as the capacitor voltage ratings issue.?
The tantalum capacitors used were rated 6.3V. they shouldn't ever see more than 5V. Indeed there is a 5.6V zener with a sharp cut-off as final protection, so I'd be very surprised if the capacitor could ever see 6.3V and exceed its rating.?
However, there were occasional field reports of the capacitor burning out (quite literally, tantalum capacitors catch fire). And not in any known circumstances such as sudden input voltage steps. So it seems that even though the capacitor's 6.3V voltage rating probably wasn't technically exceeded, it's still too close for comfort and perhaps some devices are a little lower spec than others.?
I subsequently changed to 10V rated tantalum capacitors which are available in the same size package and have not heard of burning capacitors since this change.?
Nevertheless if you have a Rev 1 board I wouldn't rush to change the capacitors, as I recall the fires were rare.?
73 Hans G0UPL
On Sun, May 11, 2025 at 02:15 PM, DL2ARL wrote:
humbly thinking that this statement is wrong. Wrong in so many ways...
Perhaps I did not include enough detail?
I'm referring to C106 and C107.
The parts supplied in Rev 1 were rated at 6V.
The parts supplied in later revs were rated at 10V.
Hans wrote a very detailed article on the overall issue here: ?
?
73, Mike KK7ER
?
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Thanks Geoff
I'm aware of this issue which needs investigation and resolution, thanks. It seems I shouldn't have much trouble reproducing it myself. It has been my priority for a very long time to get the SSB firmware done. Now once I get back from Dayton Hamvention I'll have more time.?
73 Hans G0UPL
Geoff,
?
This feature is showing up also in JO11tm!
?
73,
Roelof, pa0rdt
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Re: New QMX+ Calibration victim
Hi Ludwig,
You¡¯re right, of course I meant G not S. Brain fart ?
Good catch! Looking closely, it seems the enamel has melted on L101 and measuring with DMM shows 0.0 Ohm compared to 2.0 ohm on L102.
(Verified by measuring L101 on an unbuilt board = 2.0 ohm)
But how do you replace it?
It tested using hot air station without any success, and there is absolutely no exposed solder islands so the soldering iron is of no use. Ideas?
Starting to think I would be better off moving all the coils over to the spare board instead ?
Regards
Jonas
toggle quoted message
Show quoted text
11 maj 2025 kl. 23:52 skrev DH8WN via groups.io <DH8WN@...>:
?But if you mean G of Q108 then yes. Q112 is responsible for pulling G of Q108 high when PWM is low. Please check L101. Maybe the enamel is burned (high current in the past) and the winding is shorted. This could be the reason.
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On Fri, May 9, 2025 at 01:24 PM, N4REE - Bob wrote:
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72 de N4REE, Bob Easton - QRP CW forever
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Geoff,
?
This feature is showing up also in JO11tm!
?
73,
Roelof, pa0rdt
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Michigan QRP Club Weekly Zoom Chat
Please join us Thursday, May 15 (and every Thursday) at 4PM Eastern for the Michigan QRP Club weekly QRP Chat where the main topics will be QRP and other ham interests. New hams are encouraged to participate and ask questions. It's fun, it's easy, and it's free. You only need a computer, a smart phone, or a tablet that can connect to the Internet. OR if you can't be close to any of those you can join by audio with any standard phone. Just follow the directions below. No software needs to be loaded or installed. Anyone can join and non members are welcome. Details are here: Zoom ID: 811 0835 6229
The topic for Thursday, 15 May will be TBD. The agenda for the 15 Mayl QRP Chat: Pete to do a short introduction and acknowledge any new folks to the Zoom chat. The topic for next May 15 will be an open forum.
During the open forum anyone can take the floor. We will go one by one until all have had a chance to have the floor. Files, pictures and presentations can be shared if you have any. Please try to stay muted when someone has the floor. Thanks Ed AB8DF
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As I described in this post, what started as a harmless part exchange resulted in a dead QMX, so I sent it off to Jeff, W1NC.? He not only fixed it, he sent me a detailed explanation of what he had to do to repair the radio.? Total turn around was 11 days door-to-door.? I spent several minutes looking over the PCB before I could positively recognize it as the one I had sent him - he cleaned up all of my poor soldering and even removed all of the scorch marks! I would definitely recommend contacting Jeff if you get to a point where you can't fix it yourself.? While damaging my radio wasn't a good thing, working with Jeff was definitely a great experience!
?
73,
Mike, KL7MJ
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Re: Rev 1 vs. Rev 3 QMX Kit?
On Sun, May 11, 2025 at 02:15 PM, DL2ARL wrote:
humbly thinking that this statement is wrong. Wrong in so many ways...
Perhaps I did not include enough detail?
I'm referring to C106 and C107.
The parts supplied in Rev 1 were rated at 6V.
The parts supplied in later revs were rated at 10V.
Hans wrote a very detailed article on the overall issue here: ?
?
73, Mike KK7ER
?
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Re: Internal battery for QMX+
Hiroki,
If you will go to Dayton, Hans has got Mustafa's battery board installed in his QMX+, I am told.
12 May 2025 Pzt 16:15 tarihinde ta2rx bekir via <ta2rx.bekir= [email protected]> ?unu yazd?:
Has anyone installed a rechargeable battery in the QMX+? If so, would you share the details, such as what brand of? battery and how you wired it inside the QMX+ case? Thanks.
Hiroki AH6CY
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So, replying to my own message. I ran beacon mode this morning and it failed within 2 hours when spots ceased.. Power cycling the rig resolved the problem for a while until it failed again around 2 hours later. This time, I did see JD38 reported befor all spots ceased again.
I videoed the screen for a both good transmission and a corrupt (no reports received) transmission. There were differences in the first 10 characters between the good and bad transmission (There may well be further differences. It's tedious to work through the whole 160 characters, but I will do so if it helps?).?
The transmitted characters I recorded were as follows (first column is the corrupt and the second is valid):
?
3 1 *
0 0
2 2
0 0
2 2
2 0 *
2 2
1 1
2 2
2 2
?
Which seems to confirm that the problem lies with the QMX+/QLG3 combination.
Hans, please let me know if there is anything I can do to help you solve this.
?
73
Geoff G3WPD
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Re: Internal battery for QMX+
toggle quoted message
Show quoted text
Has anyone installed a rechargeable battery in the QMX+? If so, would you share the details, such as what brand of? battery and how you wired it inside the QMX+ case? Thanks.
Hiroki AH6CY
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Re: Unable to buy a QMX+ on QRP Labs site
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Internal battery for QMX+
Has anyone installed a rechargeable battery in the QMX+? If so, would you share the details, such as what brand of battery and how you wired it inside the QMX+ case? Thanks.
Hiroki AH6CY
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On Sun, May 11, 2025 at 11:48 PM, Lawrence KC6WOG wrote:
Funny, I wish the QMX could set it's clock to the GPS dongle that is part of all my radio computer setups! But I like your idea too.?
There is already a CAT command:
TM: Get/Set Real time clock time
Set: Sets the real time clock. Format is Tmhhmmss; for example to set the real time clock to
13:55:32, send CAT command ¡°TM135532;¡±
Get: Returns the real time clock value. For example command ¡°TM;¡± will return ¡°TM135532;¡± if the
real time clock value is 13:55:32.
?
Chris
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It's not just a IO91 problem, I have?it in IO93.
73 John M0JBA
I have had the same issue, with a QMX+ and QLG3 combination and have stopped using beacon mode because of it. The setup will typically behave well for a couple of hours before I start to see random JD38 spots and a much reduced total number of spots. A restart of the QMX+ immediately restores normal behaviour, which suggests to me that the problem lies with the transmission and not with the decoding/reporting system.
I didn't realise I could video the screen to record the encoded WSPR transmission - I will try and do that and report back on the results.
I am also in IO91. Is the problem unique to this square I wonder, or if others have experienced it?
?
73
Geoff G3WPD
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Hi all
The beacon function in QMX is very old, it originated in the Ultimate WSPR kit, which became Ultimate2, then Ultimate3, then (10 years ago) the Ultimate3S (a.k.a. U3S) see . This is how QRP Labs started. Later, the functionality was ported into the QCX, and eventually QMX.?
I suspect the problems are in my QMX firmware, not WSJT-X or WSPRnet.org or anything else.?
The issue with WSPR locator squares suddenly changing is on my list to investigate, and one of the developments?I want to make for QMX is a complete virtual U3S which can do everything U3S can do, and more. Band-hopping included, Ken.
I have had the same issue, with a QMX+ and QLG3 combination and have stopped using beacon mode because of it. The setup will typically behave well for a couple of hours before I start to see random JD38 spots and a much reduced total number of spots. A restart of the QMX+ immediately restores normal behaviour, which suggests to me that the problem lies with the transmission and not with the decoding/reporting system.
I didn't realise I could video the screen to record the encoded WSPR transmission - I will try and do that and report back on the results.
I am also in IO91. Is the problem unique to this square I wonder, or if others have experienced it?
?
73
Geoff G3WPD
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I have had the same issue, with a QMX+ and QLG3 combination and have stopped using beacon mode because of it. The setup will typically behave well for a couple of hours before I start to see random JD38 spots and a much reduced total number of spots. A restart of the QMX+ immediately restores normal behaviour, which suggests to me that the problem lies with the transmission and not with the decoding/reporting system.
I didn't realise I could video the screen to record the encoded WSPR transmission - I will try and do that and report back on the results.
I am also in IO91. Is the problem unique to this square I wonder, or if others have experienced it?
?
73
Geoff G3WPD
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OldEngineer
Andrew KI7FXL
N4REE - Bob