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Re: QCX-mini parts

 

GE Richard,

I have seen others use a piece of brass tube from Hobby Lobby to extend the shaft, ream the hole in the case and any suitable knob thus leaving the boards intact.? Otherwise, I would put in a question to Hans and I believe he will give you the info you need.

72,

John
KK4ITX



for Zephyrhills Area Amateur Radio Club
Many of life's failures are people who
did not realize how close they were to
success when they gave up.
? ? ? ?Thomas A. Edison? ? ?






On Saturday, January 25, 2025 at 09:05:52 AM EST, rsmith via groups.io <rjsmith1919@...> wrote:


I acquired? a damaged QCX-mini from an sk estate.? The volume knob and and pot shaft are missing.? Looks like the shaft of the potentiometer broke below the case, possibly it was dropped and hit the knob.? The unit powers up at 12volts and appears to work just fine.? The remaining shaft is operable by placing a splunger on the remaining shaft and ,with difficulty , I can adjust the AF gain.? At power up it says it is a? 2020 version 1.07a, which I would guess is the firmware.? Does anyone know what the part # or part description might be?? Possibly even the digikey part #, as they are in my back yard.? Seems like it would be straight forward to pull it out of its case and replace the pot and knob with original parts.? It is a 30 meter model if that matters.
Thanks in advance,
AD?SN
Re: QMX 60-15M won't turn on... potential solution

 

Brien, we don't know about the things around your QMX, which power supply or is there a ground connection from this power supply to your computer. In the moment I don't see a relation to the firmware. So maybe a flaky ground connection between the power supply and the QMX bypassed via the computer and USB cable? Or did you move the QMX PCB a little bit when plugging in USB and "repair" a cold solder joint?
?
It would be nice to know how much supply current when you try to switch on without success (and without USB connection). If nearly 0 the QMX is really off and connecting the computer couldn't trigger something from the firmware. If you see something around 100 mA (@ 9...12 V) the controller seems to work but showing no action via the display. And if you see something around 200 mA the controller may stuck somewhere in initialisation.
?
Waiting for some more information.
73 Ludwig
Re: QCX Encoder and Potentiometer Part Number #parts #qcx #qcxmini #qcx-mini

 

Jonathan...
Did you ever get the information you were looking for?? Below is a copy of a post I recently made.? I'm looking for the same thing for an abandoned QCX-mini
?
I acquired? a damaged QCX-mini from an sk estate.? The volume knob and and pot shaft are missing.? Looks like the shaft of the potentiometer broke below the case, possibly it was dropped and hit the knob.? The unit powers up at 12volts and appears to work just fine.? The remaining shaft is operable by placing a splunger on the remaining shaft and ,with difficulty , I can adjust the AF gain.? At power up it says it is a? 2020 version 1.07a, which I would guess is the firmware.? Does anyone know what the part # or part description might be?? Possibly even the digikey part #, as they are in my back yard.? Seems like it would be straight forward to pull it out of its case and replace the pot and knob with original parts.? It is a 30 meter model if that matters.
Thanks in advance,
AD?SN
?
Re: #QLG3 #QMXplus QLG3 troubleshooting - is there a manual? #QLG3 #QMXplus

 

Mike, I have experienced the same kind of problem. My QLG3 in my QMX+ had been working OK, but today only got a fix on one satellite, and then lost that as the day went on. I pulled the module out and checked all the connections to the board, then plugged it back in, but no change. It failed to receive any signals.. The QMX diagnostics shows the GPS viewer in red and the viewer shows no data being received. Did you ever try to get it going again?
--
73, Dan - W2DLC
Re: I have a craving...

 

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Bill,

Nicely done project!

72/73,

Jim, K8IQY


On 1/25/2025 3:39 PM, Bill via groups.io wrote:

All,
?
???? Have a look at < >.
?
???? I wanted to refresh my old(er) SWR & Power meter, and a chassis similar to the QMX+ was readily available. Thus, I made my own "matching" unit.
?
???? I can't currently etch aluminum so I used a sticker.? The font is much larger than the QMX+.

? ? ?This isn't a kit, it's the complete plans to allow anyone to duplicate what I have. ?If I've forgotten anything, email me at < w2eb@... >.
?
Bill
W2EB
East Syracuse, NY
QMX Repair by Jeff W1NC.

 

I recently completed assembling a QMX Mid Band Rev. 4 and had problems getting it to work properly. There was no output on any band, with lowish power drain on all frequencies. I contacted Jeff Moore W1NC and he kindly agreed to have a look at it for me. He expertly gave the set a full overhaul and found several solder wiskers and dry joints (ouch), rewound a couple of the toroids and returned it safely to me in full working order.?
So many thanks to Jeff for his time and help.?
?
David. GM0OPX.
?
Re: I have a craving...

 

All,
?
???? Have a look at < >.
?
???? I wanted to refresh my old(er) SWR & Power meter, and a chassis similar to the QMX+ was readily available. Thus, I made my own "matching" unit.
?
???? I can't currently etch aluminum so I used a sticker.? The font is much larger than the QMX+.

? ? ?This isn't a kit, it's the complete plans to allow anyone to duplicate what I have. ?If I've forgotten anything, email me at < w2eb@... >.
?
Bill
W2EB
East Syracuse, NY
QMX 60-15M won't turn on... potential solution

 

I put this here in case others have experienced this and might try this "solution" before taking your radio apart looking for some other problem.? ?On two separate occasions I have been unable to turn on my QMX.? After trial and error I discovered that with power applied to the transceiver, plugging the transceiver into the PC via the type C connector immediately allows it to be turned on and it works after that.? I don't know if this is a software issue where it gets into a state where it is expects a USB connection or some other issue.? I would be interested in knowing if others have experienced this.
?
Brien - KE7WB?
QMX+ Parts List #build #QMXplus

 

Hello,?
I just received my QMX+ kit and was sorting through the capacitors.? All were account for except the 43pF.? I have one capacitor that was not account for.? It looks like the capacitor reads 316 RAT.? Would that be the 43pF capacitor?
Thank you,?
Brian K0BWH
Re: the next time someone asks when SSB firmware will be ready

 

That was quite apropos.

This one, not so much.

Sorry about the pun. ;)

-=-=-=-=-=-=-=-=-
73,
Gwen, NG3P
CW Practice / Rag Chew Report and Announcement

 

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I had only one show up for the CW on the air practice session on Saturday,?25 January?at 11:00 AM Eastern Time, 16:00 UTC on 17 meters.

Date / Time Call Bnd Mode Power Frequency Snt Rec Name SPC# Comments
1/25/2025 16:40 NP3K 17 CW 10 18.082 579 559 Abe FL K3 at 10 watts 100ft sloped doublet

Conditions were good. SSN=131, SFI=205 A=7 K=1.? My next CW practice session will be early next week. Anyone is welcome. This practice is intended for operators who are new to CW or they need some CW practice. IT DOES NOT MATTER HOW POOR YOUR CW IS. Mistakes are OK. Poor fists are OK. Slow speed is OK. Really slow speed is OK. This practice is meant for you to improve your CW. I will do my best to adjust to your skill level. Operate at any power level. If several stations show up, I will operate as a round-table control station. I will do it as a round-table so everyone gets a chance to transmit. Please listen to my directions.

Details:
Date - TBD
Time - TBD
Band - TBD

How to find me - I will find a clear frequency and call CQ. Go to the Reverse Beacon Network and search for my call sign AB8DF.


That will tell you what frequency I am on. Tune your station to that frequency and if you hear me give me a call. If there is a QSO in progress, please wait for a break in the action. Then send your callsign. If I hear you, I will invite you to join the QSO and start a round-table QSO.

Reply to this email if you have questions.

IT DOES NOT MATTER HOW POOR CW IS

Ed
AB8DF
Re: #qmx+ QMX+ PCB Rev3

 

Hello Sardar

You probably had a thought of replacing fixed inductors and diodes to their SMD versions as well to be soldered at the factory. Those are the last remaining THT components (well mosfets too) . What is the reason you still left them for the manual assembly? Cost, component quality? "Game utility"? (Some people just love to solder a lot)?
?
Would be interesting to know your thoughts on this.

There are performance questions. Not all 1N4007 diodes work as well as each other in terms of 2nd order IMD products. Even between different manufacturers of through-hole 1N4007 diodes. I'd like to change then to SMD but I need to test the idea thoroughly first. And so far it hasn't been the highest priority. Same applies to inductors. Remember the 47uH SMD inductors used on the Rev 1 QDX had self-resonance and it was necessary for the constructor to remove them and replace them with tacked on through hole 47uH inductors which solved the problem and have been used ever since. Again it's not an unsolvable problem, finding suitable SMD inductors, but it needs some work on testing.

73 Hans G0UPL

73 Hans G0UPL
Re: QMX mini input voltage tolerance

 

@Todd: Great photo. ?Nope, cant see the battery at all!

But, I do like how you drilled holes in that clipboard! Great idea! ?
Re: the next time someone asks when SSB firmware will be ready

 

?

""I only hope Hans website can cope with the firmware download demand?WHEN?it is released ... Peter m0pwx ""

Me too

re WHEN ?? ...
... I predict...? "4 Days in May"??

WHEN...? Hans is QSY/US . ..? i.e. not home WHEN Turkey's internet overloads es shuts down

72 73
John
N3AAZ
Re: 4x QDX kits and more for sale

 

I've sold everything but the two QDX rev 1s, thanks to those who bought kits. It's fun to connect with other people who love these qrplabs products as much as I do.

Still have:

3. $80 Unbuilt?QDX?Rev One low band with case
4. $80 Unbuilt?QDX?Rev One low band with case

If you're interested in trading I'd love to hear what you have. In particular?if you have a monoband QDX kit and would prefer to build a five band one, happy to trade.

On Thu, Jan 16, 2025 at 11:37?AM Joel Sandin via <jsandin=gmail.com@groups.io> wrote:
Hi folks,

Selling a few excess kits - needless to say I love building QDXes but my time is going into other builds at the moment.

For sale, with price including shipping in the US:
1. $85 Unbuilt QDX Rev Three low band with case and power cord
2. $85 Unbuilt QDX Rev Three low band with case and power cord
3. $80 Unbuilt QDX Rev One low band with case
4. $80 Unbuilt QDX Rev One low band with case
5. $15 QDX high band conversion kit
6. $5 QRP dummy load kit

Take $5 off each additional QDX you buy if you choose to buy more than one. Pay by check or MO. Please contact me off list, thanks!
Re: QDX-M for 6M

 

Chris, thanks for sharing this! Have you made any contacts on it yet? How is the BPF alignment/scan with these values?
?
I've got 4 QDXs built, and thinking my next one may be exactly what you built so I can get on 6m with my Hardrock 50 amp.
?
-Nate
N8BTR
QCX-mini parts

 

I acquired? a damaged QCX-mini from an sk estate.? The volume knob and and pot shaft are missing.? Looks like the shaft of the potentiometer broke below the case, possibly it was dropped and hit the knob.? The unit powers up at 12volts and appears to work just fine.? The remaining shaft is operable by placing a splunger on the remaining shaft and ,with difficulty , I can adjust the AF gain.? At power up it says it is a? 2020 version 1.07a, which I would guess is the firmware.? Does anyone know what the part # or part description might be?? Possibly even the digikey part #, as they are in my back yard.? Seems like it would be straight forward to pull it out of its case and replace the pot and knob with original parts.? It is a 30 meter model if that matters.
Thanks in advance,
AD?SN
Re: the next time someone asks when SSB firmware will be ready

 

On Fri, Jan 24, 2025 at 07:51 PM, Todd W2TEF wrote:
Yup, I knew he was speaking at FDIM, so that's why I suggested that. It would have a certain poetic resonance with last year's release, and May is NOT FAR OFF. And there is the title of that talk, which could be given before the firmware's release, but would have a bit more relevance afterward.
i only hope Hans website can cope with the firmware download demand WHEN it is released
?
as unlike the launch of a new product which results in a flurry of orders then a trickle of kits as he ships them, there are a lot of QMX / QMX+ already out there waiting for the firmware update to be released?
?
?
using QMX as panadapter core

 

Hello everyone,
?
this morning I made an experiment - and tried to use my QMX (which is mainly used in SOTA and outdoor activities) as an SDR core for a panadapter for my RGO One.
The idea is quite simple: Just route the IF output into the QMX, connect the QMX with I/Q enabled to a laptop running HDSDR, set the proper rx QRG (near IF of main transceiver) and it works.
?
To find the correct frequency to be set at QMX, you just tune a station with the main rig, find the appropriate peak in the spectrum and adjust QMX frequency to propely hit the filter.
In case on band change I observed a slight deviation (about 200 Hz) which can be easily adjusted at the QMX.
?
This setup also works in split mode for quickly calling DX stations.
?
In case you have a partially broken QMX you do not want to repair - here is a possible second life.
Or - it could be a simple new product - QRP-labs panadapter code with a reduced part number :-)
?
vy 73,
Ralph. DL1HR
?
Re: QMX+ assembly suggestions

 

Hi Hans,
?
Regarding the display header - it would seem the way to go is partial assembly without the front panel, solder the display side of the header, and then re-assemble fully to finish. That would address both issues. I really didn't dare to even try soldering under the "shelf". Perhaps I am getting too old and my eyesight too poor.
?
Regarding soldering the GPS power jumper - duh! And oops.
?
Jim AJ8S
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