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Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Plus PTT output doesn't work properly. Nothing changes there when I start TX.
BR/Sergey
UB3AZK
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Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

Hello Hans! Looks like there is a bug with SWR measurement during usage of PA. QMX detects very high SWR during TX threw PA and stops it (if protection is switched on). In reality SWR is 1.1 (confirmed by Hardware test of QMX itself + Nano VNA).?
BR Sergey
UB3AZK
Re: QMX+ External Mic #qmx #ssb

 

Menu -> SSB -> Input -> Ext. Mic
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But it sounds like your mic cable is wired backwards.? Mic signal needs to go to ring, ptt to tip.
QMX+ External Mic #qmx #ssb

 

Just updated my QMX+ to 01_01_003 Beta. Plugged a modified Baofeng mic into the front panel and tried running the microphone test. It doesn't seem to work.
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I can tap on the front panel, and that seems to get a bit of a response, but the mic is dead. Also, in USB/LSB mode, PTT doesn't switch to transmit. Hardware diagnostics indicate that the mic's PTT switch is working. Can see that the diagnostic notices the mic's FET...
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Unplugged and powered the mic from 10V through a 2K resistor. I can see audio with my scope, so that looks like it's working.
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Is there a setting I need to change, for the external mic to work?
?
TIA!
Paul -- AI7JR
Re: Simulation of #QMX Filters + planned 6m in QMX #qmx

 

Thanks Evan and Nate!
?
I found the threads and an answer of Hans in an older conversation:
My Bpf simulation is too simplistic.
Impedance and the environment have a big influence.
?
73 Peter DL4PJ?
Re: Continuity on #RWTST - #RWTST #QMXplus

 

I would guess that 100% of the QRP Labs kits are shipped
with some manufacturer's thermaleze equivalent wire.

I would further guess that a very, very small contingent
in this group would use their own wire over the wire provided
by QRP Labs with their kits... I am one of that contingent,
but only because I use a toroid winding machine, and filling
my winding machine's shuttle from short hanks of wire is a
chore.

But you are right, if you use something exotic, such as a
ceramic insulated wire, my tip about using a common lighter
won't work.

You may not know it, so I will help you: You are using an
exotic wire. I will jump out on a limb and say that most QRP
Labs kit builders, aren't.

-Chuck Harris, WA3UQV


On Tue, 25 Mar 2025 09:10:42 -0700 "Stan Dye via groups.io"
<standye@...> wrote:
On Tue, Mar 25, 2025 at 08:57 AM, Chuck Harris wrote:


Unless you are using some exotic insulated wire, a few
seconds of exposure to the flame of a butane lighter will
easily burn off the enamel.
My experience is different, Chuck.? A simple roll of wire (certainly
not exotic) I bought on Amazon from a quality manufacturer happens to
have a high-temperature enamel.? So yes, I can burn it off, but only
with with a high-temperature butane torch, but not a simple butane
lighter flame nor any soldering temperatures. Other wire types do
have enamel that is specially formulated to burn off with solder or
at low temperatures - you can often see it in their specs. The .6
wire that Hans originally provided is somewhere between the two - if
I didn't scrape it at least some amount, to significantly fracture
its surface, it wouldn't burn off for me with soldering nor a simple
lighter flame.? And I don't like to use a high-temperature torch.
Stan KC7XE.
Re: Continuity on #RWTST - #RWTST #QMXplus

 

I started from scratch and got it working. As everyone suggested, I needed to do a better job removing the enamel from the P wires. Additional heat did the trick. Thanks everyone!
Re: QMX SSB settings for Winlink?

 

Hm, thanks Stan. I ran the auto calibration the other night so that's fresh. I can reliably get level 5-10 on receive, but it doesn't seem to get out of level 1 or 2 on transmit.


On Sun, Mar 23, 2025 at 10:33?PM Stan Dye via <standye=[email protected]> wrote:
None of the mic-gain/agc/filter settings pertain to the USB / Winlink interface (assuming the software is as documented).
Only the phase and amplitude modulation compensation should make a difference - and I have it at pretty much default settings.
?
A lot of the speed will depend on quality of your connection (propagation).? I just connected again, with about 1W of output power, which is all it would give me on 40m SSB.? The speed/level varied a lot during the send of a large email -- it spent a lot of time at level 6 and down a notch at level 5, but several packets went out at level 7 and 8 (and some at 4 and 3, too).
?
So it is working for me...
Stan KC7XE
Re: QMX SSB Vertical lines on VARA waterfall?

 

No, it doesn't necessarily happen every time the radio keys, but it does seem to happen at least once per VARA/Winlink session.


On Mon, Mar 24, 2025 at 9:33?AM Christopher Kovacs via <w0anm73=[email protected]> wrote:
Are you using VOX? I had the same issue until I upgraded to latest firmware and back to cat PTT control.
?
Chris, w0anm?
Re: Simulation of #QMX Filters + planned 6m in QMX #qmx

 

Peter,?
I recall some discussion about this in QDXs maybe in the past...and some thought that the impedance is NOT 50 ohms, and/or, not acting like it on that input.......?
Keep us posted with what you are able to do.... I've figured out that one could cover all bands 160-6 with the 6 band setup screen as far as generating the signals.... but the filtering for BPF and LPF would require a whole separate set of filter boards....And thus the QMX+ :-)
?
-Nate?
N8BTR
Re: mic test doesn't scroll up

 

When I use screen in Linux, sometimes the terminal window is slightly out of shape and the mic tests does what you're describing.
Re: Simulation of #QMX Filters + planned 6m in QMX #qmx

 

Hi Peter,
?
Here is an LTSpice XVII simulation for the QDX High-Band filters. I've included a PDF printout in case you don't have LTSpice.
?
73
Evan
AC9TU
mic test doesn't scroll up

 

This probably some configuration with my terminal emulator.
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When running the mic test I get the bottom row. However, it does not scroll up. So I don't see the history covered on the beta firmware page.
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I've tried a factory reset. I'm wondering if anyone has this issue and knows how to resolve it.
Re: New Build, No Flash Drive found #build #building #qmx

 

Hi Russ and Stan.? thanks for the support.? I do seem to have proper resistance between VCC adn VDD and ground.? I have ordered new boards (and in fact a whole new QMX kit just in case).
I also detected a poorly connected leg of the binocular T507 transformer.
?
Hoping I didn't cook the entire radio, but will have to wait for the new boards.? I have successfully built the QCX mini and the (tr)uSDX, so crossing my fingers that I didn't fall apart on the QMX
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Thanks again for your answers.
JD
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

I agree that would have been easier... but it's done now LOL... I agree, if I need to do it again, that's the plan.
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I am happy to report that the quadruple BS107 transplant seems to have been successful :)
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Running the calibration now... hoping for the best.
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73,
Joel W9JFK
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

When I use my Hermes Lite 2 or a Tiny SA it appears that my audio goes way beyond 3 KHz on USB for example both above and below my center frequency. However checking on a remote WebSDR I see what looks like a clean well defined SSB/USB signal and all my audio reports have been good.
?
?
73,
Jim AC9YY
Re: Simulation of #QMX Filters + planned 6m in QMX #qmx

 

Today I soldered the original BPF configuration into my QMX 20-10.
Preliminary I bypassed the 20m LPF, and I left out the two other LPFs.
I configured all bands to use the LPF bypass and can sweep through the BPFs through all bands.
Everything works fine as I am used from the QMXs, but not as simulated ;-)

The band pass filter is much steeper than my simulation!
=> My assumption is wrong: I can't use the 10m BPF for 6m.
Maybe my configuration for the simulation is wrong?
- Did I use the right impedance (50 Ohm)?
- Is my circuit for the simulation correct??
I understand the BPF like this:
?
RX IN ------ L ------ C ------- OUT
GND ---------------------------- GND
?
Is this too simplistic? Is T401 to be seen as essential part of the BPF?
?
73 Peter DL4PJ
Re: Qmx Ssb intermittent transmit.

 

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Try tightening up the ring contact on the 3.5mm jack. ?If you reach in with a very small barrow blade screwdriver you can bend that contact out to place more tension in the plug for a more reliable contact.

That fixed my intermittent on the QMX. ?On the QMX+ I installed Kobiconn jacks (Mouser) on the rear panel. I used the TRRS jack for even more retention of the plugs.

Dave WI6R

On Mar 25, 2025, at 08:26, Petrov Sergey via groups.io <irtish71@...> wrote:

?The same with me. Smtm you need to press PTT twice to start tx.

16:35, 25 March 2025, "Howard Lamhut via groups.io" <howardlam@...>:
蚕惭齿…
I have the SSB software installed version three and made one contact with good audio reports.
The only thing that is strange is sometimes the radio does not go into transmit when I press the PTT in Ssb mode. In CW mode it works every time 100%.
?


--
Sent from Yandex?Mail for mobile

Re: QMX+ Rev.3

 

I just wound L506 with 42 turns....only because the solitary yellow core was already used making L403 !
Re: #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

I wouldn't worry to much. Hans wrote regarding the calibration "The results are markedly different by band, this is normal. " and "Some phase error measurements do have weird glitches."
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73 Ludwig
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