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Re: Here's hoping for QMX+ v2

 

Works great (mini PC):
--
John AE5X
Re: Here's hoping for QMX+ v2

 

On Thu, Apr 10, 2025 at 09:18 AM, Jerry Gaffke wrote:


May be possible to do all you want by adding an RPi-Zero and a screen of your
choice into the top half of the QMX+ clamshell.
Hans plans to add more firmware features to the QMX, allowing more control via
UART and USB.
Jerry, this is an idea that has been floating around in my head. Some folks like the UI of the TR-45 or the K2. With CAT (and eventually BASIC scripting), those UI's and most of their features could likely be replicated with an RPi-Zero talking to the QMX. And, as Samantha suggests, the zBitx.

Separating out RF design and UI design seems like an opportunity.

73 de Todd W2TEF
Re: QMX+ new asssembled powers on but makes 'chuffing' sound on receive on CW?

 

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Thanks for the replies. I open a?ticket w QRP LAbs and Hans responded that he is sending a new unit.?
He agrees something is amiss with this one.

?He indicated he will pick?up the old unit when he is Dayton in May.?

I thanked him fpr the great support.

Charlie k2cmc

--
?
Charlie C. ?- K2CMC
LICW/SKCC/NAQCC?
Re: QMX display unususal problem #qmx #dispay

 

Ludwig, i checked when display board was completed to main board.?

---------------------------------
73 de Marek SP9TKW
Re: QMX+ new asssembled powers on but makes 'chuffing' sound on receive on CW?

 

Hi Charlie,
?
"i get a continuous series of dahs all the time. Even with key and cable disconnected."
I wonder if you have a short on the 3.5mm TRS mic/paddle socket.
Check that there are no solder blobs across all of the pins on the TRS socket and the mini board connecting to the main board.
Also, make sure that the underneath of mini socket board is not touching the casing when you slide the board in (assuming that you have it in a metal housing). There isn't a lot of space between the underneath of the mini TRS board and the casing. I had a slimier issue after completing my QMX+.
?
Mel. M0KMD
Re: QMX+ with 100 amp/hour lithium iron battery

 

I used 7812 and there was slight noise. I returned to one diod instead and everything is ok now.

09:32, 11 April 2025, "Alan G4ZFQ via groups.io" <alan4alan@...>:

On 10/04/2025 18:28, Petrov Sergey via groups.io wrote:

?It generates slight RF noize. Which is annoying.


Do you mean the 7809 is producing RF noise?
If so, then suspect the decoupling capacitors.
A 7809 should be noise-free.

73 Alan G4ZFQ





--
Sent from Yandex?Mail for mobile
Re: QMX+ with 100 amp/hour lithium iron battery

 

On 10/04/2025 18:28, Petrov Sergey via groups.io wrote:
It generates slight RF noize. Which is annoying.
Do you mean the 7809 is producing RF noise?
If so, then suspect the decoupling capacitors.
A 7809 should be noise-free.

73 Alan G4ZFQ
QMX+ new asssembled powers on but makes 'chuffing' sound on receive on CW?

 

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Hello i have received my assembled QMX+ a few days ago and go the power cabled assembled feeding this unit with 11.80v of dc. (12v model)?

I can putty into it and see the hardware tests pass, the data sheet shows all good on all bands.?

It powers up and down fine. I have not xmited w it yet.?

I can viewed the manual that i downloaded and printed out for vx.0027 of my software?

Still not sure of how to operate it.?

When i turned on practice mode or keyed i get a continuous series of dahs all the time. Even with key and cable disconnected. ????

If i put the unit in vfo mode it seems to go away. Volume., are and band changes seem ok.

I got thsi to stop but not sure how???

on any band cw i get a continuous audio chuffing sound like its sampling or some such.?

I can use some help or guidance on this and i am not transmitiing until i get this sorted out.?

Can i or did i change a settting in the config when i puttyed in?

Maybe its my ignorance of how it operates??

Thanks in advance?
Charlie k2cmc






--
?
Charlie C. ?- K2CMC
LICW/SKCC/NAQCC?
Re: Tariffs?

 

Just got my QMX+ last week in the US; DHL at least at the time didn't charge any brokerage. It's under $800 and so the de minimus applies.
As others have noted, when I lived in Canada dealing with those import fees from the Fedex, UPS and DHL cartel was much, much worse. The only carrier in Canada that was at all reasonable with fees was Canada Post, but it's a lot slower to ship through standard post.

Re: Here's hoping for QMX+ v2

 

On Thu, Apr 10, 2025 at 11:36 AM, George Korper wrote:
I purchased an amazing $140 mini PC and use a USB cable.
Please share the details.
Thanks and 73, Don N2VGU
Re: Tariffs?

 

I think you will be OK. Nothing has changed for US. Relax.
Re: Here's hoping for QMX+ v2

 

I'm using this amazing and cheap PC using a Raspberry Pi4-B with 8GBit RAM and Rasbian OS (a Debian Linux OS) sold at the low price of US$219 and working well. It has a choice of 2 OS to boot and I added to the original Rasbian OS the HamPi OS, the latter being a Hamradio Linux OS with all necessary Ham radio softwares installed.
?
73 - Pierre - FK8IH
QMX+ with Elecraft KXPA100 amp..;-)

 

Ok,,,, just for fun I thought I would try my QMX+ with my KXPA100 amp and *it works great*... puts out about 50 watts with QMX+ driving it.
?
I made my first SSB contact in QRP mode on 20m the other day but since the bands are not that great and I have this amp normally hooked up to my KX3 I thought I would see how hard it was to get working... EASY.. just set the PTT on each band to "grounded" and I have a TRS-to-RCA breakout cable (not sure I have that but...) once I figured out which RCA plug was which, I just plugged it into the KXPA100 and bingo! ?Plus since the KXPA100 has an ATU built in I can use that as my tuner !
?
Pretty cool...just wanted to toss that out there in case anybody else was thinking "QRO".... ?
Of course.. NOT a cost-effective solution...;-)
?
Mark
Updated Wiki Page: QMX QMX_plus debugging environment #wiki-notice

Group Notification
 

The wiki page QMX QMX_plus debugging environment has been updated by @Ludwig_DH8WN <DH8WN@...>.

Compare Revisions
Re: QMX display unususal problem #qmx #dispay

 

Marek, did you check when displayboard is connected to the mainboard and also the displayboard alone?
2 - 3 7k is ok, my fault.
?
73 Ludwig
Re: QMX display unususal problem #qmx #dispay

 

Hi Ludwig,
?
Thanks for suggestion and info. I have measured resistance between all pins (2-3,3-4, 4-5....) and except pin 2&3 resistance it in Mohms, usually 5-12MOhm. However between pin 2-3 I have only 7kohm the same value as between pin 1-2. Is there any significance in this values?
?
Thanks.?
?
---------------------------------
73 de Marek SP9TKW
QMX+ issues on 1st operation?? #12v #anomaly

 

Hello i have received my assembled QMX+ a few days ago and go the power cabled assembled feeding this unit with 11.80v of dc. (12v model)?
?
I can putty into it and see the hardware tests pass, the data sheet shows all good on all bands.?
?
It powers up and down fine. I have not xmited w it yet.?
?
I can viewed the manual that i downloaded and printed out for vx.0027 of my software?
?
Still not sure of how to operate it.?
?
When i turned on practice mode or keyed i get a continuous series of dahs all the time. Even with key and cable disconnected. ????
?
If i put the unit in vfo mode it seems to go away. Volume., are and band changes seem ok.
?
I got thsi to stop but not sure how???
?
on any band cw i get a continuous audio chuffing sound like its sampling or some such.?
?
I can use some help or guidance on this and i am not transmitiing until i get this sorted out.?
?
Can i or did i change a settting in the config when i puttyed in?
?
Maybe its my ignorance of how it operates??
?
Thanks in advance?
Charlie k2cmc
--
?
Charlie C. ?- K2CMC
LICW/SKCC/NAQCC?
Re: QMX+ with 100 amp/hour lithium iron battery

 

Hope you’ve got your fault protection sorted.?
Prospective short circuit will be 10kA and an auto fuse ain’t going to stop that arcing ..
Re: QMX+ with 100 amp/hour lithium iron battery

 

"I built my QMX+ for 9v, then installed an LM7809 inside so it will accept 10-30vdc input. That solves the over-voltage problem (that killed my first QMX) but doesn't allow for adjusting the power output as discussed here."
?
It generates slight RF noize. Which is annoying.?


----------------
Subject: [QRPLabs] QMX+ with 100 amp/hour lithium iron battery;
10.04.2025, 21:13, "Tom - AJ8X via groups.io" <tom.metty@...>:

I built my QMX+ for 9v, then installed an LM7809 inside so it will accept 10-30vdc input. That solves the over-voltage problem (that killed my first QMX) but doesn't allow for adjusting the power output as discussed here.
?
In hindsight, I like the adjustable buck-boost idea to solve both problems.
?
Re: QMX+ with 100 amp/hour lithium iron battery

 

I built my QMX+ for 9v, then installed an LM7809 inside so it will accept 10-30vdc input. That solves the over-voltage problem (that killed my first QMX) but doesn't allow for adjusting the power output as discussed here.
?
In hindsight, I like the adjustable buck-boost idea to solve both problems.
?
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