Can you measure the current draw from your power supply to the QMX in the following three conditions:
1 - while QMX is powered off (remove power cord, then replace it to make sure QMX is off).
2 - while you are pressing the power-on button?
3 - after you release? the power-on button (which is when it should be powered on).
?
That will help determine what state your QMX is in.
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OK it is WSJT-X 2.7.0 running under Win 11.
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Re: QMX and WSJTX. audio problem
stan. tnx so much for the tip. everything is working great. ? i know i had read that but only when first received. the QMX. ?at the time i only wanted to do CW but now i wanna try some of the new FAST modes.
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so tnx again
Niece
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Re: #qmx #SSB Firmware beta 1_01_003 release
#qmx
#ssb
Turning the EQ on and maxing it out to +20 took care of my distortion problem. Also tried the QRP Guys microphone and everything seems to be working. Before that it was unusable.?
I now show power out and have made contacts from San Diego to Kentucky.
I need to try it on my QMX+ now. The test I just ran is on a QMX 20-10. Not going to calibrate again. It’s been calibrated multiple times.?
Im running the mic gain at 63 and compression at 5.
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Re: Figuring out why no keyer sound and updating my QMX Menu Reference to Firmware 1_01_003
My CW practice and normal mode sidetone volume works fine, just like before the update.
Check to see if your sidetone abs/rel or sidetone vol settings somehow got changed.
Stan KC7XE
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Re: #qmx #SSB Firmware beta 1_01_003 release
#qmx
#ssb
Hi All,
Has anyone tested CESSB vs. SSB. Is the claim and brag ( marketing parlance)? that it is like having a 10 watt output something the 'brave'?
feel after installing the new firmware? Is there a noticeable difference??
73,
George?
K3GK
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Figuring out why no keyer sound and updating my QMX Menu Reference to Firmware 1_01_003
I updated my QMX and in the process I get no sound during practice.? It is sending but there is no volume.
any ideas as to the issue?? Has to be a new setting.
?
In the process of figuring this out I am updating my QMX Menu Reference.
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On Fri, Mar 28, 2025 at 06:19 PM, paul G0HEU wrote:
is there any way I can “smooth” this out a little, drop 160m down and increase 6m ???
You can only do this balancing act with bands which share a lowpass filter.? Otherwise, it is mostly the output transistors (and I suspect their drivers, which have to drive their gate capacitances) losing "oomph!" at the higher bands.? Component losses and parasitics are worse at low VHF as well.
73, Don N2VGU
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Re: #QMX #SSB #calibration A note about spurious PA power after IMD optimization on a band is over
#qmx
#ssb
#calibration
Enzo, I checked a couple of IMD optimizations on my QMX, and this does not happen.
Others should check.
Anything else special about your setup or the sequence of test steps you did?
Stan KC7XE
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Decided that seeing I have the GPS installed, to revisit beacon mode. Setup all the parameters including frequency 14097.200. Well it seems to Beacon OK...I can see that it is transmitting. Problem is ...it is not on 14097.2....in fact I have no idea if it is even on 20m. Bit of a glitch here ?
de VK6XT?
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Re: QSX project retirement
On Fri, Mar 28, 2025 at 03:14 PM, Muhsin TA1MHS wrote:
On Wed, Mafot r 19, 2025 at 10:56 AM, KEN G4APB wrote:
Hans said…..Sure! We are currently preparing 500 more of the 10W Linear kit. I have the PCBs on the way with FedEx and everything else is here in hand already!
?
So what are all these going to be used with?
?
?
I've wondered if the second stage of the 10W linear could be hooked into the QMX between the existing PA and the LPFs, sort of where T501 is.? T501 would become two transformers, one would provide the drive for the PA stage, the second would manage the impedance transform to the existing LPFs.
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Re: QMX and WSJTX. audio problem
See operations manual, pg 65-68 for all the details.
Make sure to turn on/power cycle the QMX -after- you plug it into the computer so the serial port will register properly in Win10.
If choosing QMX doesn't work, choose either QDX or Kenwood TS-480.? Some versions of the hamlib in wsjt-x don't work with the QMX setting.? If you update (in wsjt-x) to hamlib v4.6.2, it does work with the QMX selection.
Choose the audio devices with QMX in the name.
Stan KC7XE
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Re: QSX project retirement
Thanks, Hans for your reply. I have been 100% CW op for some time. I was looking for a potential Lab599 TX-500 or KX2/KX3 (or fill in the name of another "QRP" rig) killer. I know,... much different radios with different design criteria. I am not doing SSB (or Digital for that matter), so I guess the CESSB won't be of any use for me. No big deal, I was just curious.
--
73, Norm/KC1BMD
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QMX and WSJTX. audio problem
qmx with win10 laptop. 2.7 wsjtx
when configuring radio it allows. me to select qrplabs qmx. but does not like and. selection for audio
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what do i need to
do to get digi modes/ft4 working?
does anyone have the. wsjtx settings?
?
tnx Niece
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The extra high output at 160m is normal.? Hans previously said he will reduce it because associated with it are high peak voltages at the BS170's exceeding the manufacturer's rating.? You can remove a turn from the 6m LPF inductors.
Good luck - be very careful at 160m, particularly avoid high swr and definitely don't operate with more than 12v, use 10v if possible.
Chris
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Re: Help with partially fried QMX
From your photos, your soldering looks fine.?
?
The fried transistor could be causing that continuity now.? Since you have ordered a new one, you could just remove the current one and see if the short goes away.? (It may be easier to cut the legs off first to remove the device, then un-solder the remaining parts of the legs.)
?
The coil looks like it also took a lot of heat; it may be best to replace it.? You can test its continuity by probing the top of D106 and C107.? But even if it still has continuity, if there are internal wire shorts due to burned insulation, it would have a lower inductance and be less effective in filtering the power.? But it may be ok - you could also measure the inductance using the same probe points, if you have an LCR meter.
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It would be good to test D108 and see if it looks like it shorted internally, since it would also have been sinking lots of current.
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The real question, though, is "what caused this?".? I don't know.? As noted before,? it seems like one or more shorts had to be there.? I would still verify on the connector to the main board that none of the connector pins to the SMPS have any continuity to each other.? And look very carefully as you mate the control/display boards with the main board, to see if any metallic surfaces come in contact with each other.?? And next time you turn it on to test with new parts, make sure and have a 200-250mA current limit set to avoid breaking something again if there is a fault still present.
?
Stan KC7XE
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Hi all
I have just built and finished my first QMX+ and it worked first time well impressed. Just one question on the power output which I am measuring into a dummy load.
On 160m I am getting 7.2w, 80m 7.3w, 60m 6.5w, 40m 5.6w, 30m 5.5w, 20m 5.2w, 17m 4w, 15m 4.7w, 12m 2.8, 10m 3.5w 6m 2.8w so dropping from 7.2w to 2.8w is there any way I can “smooth” this out a little, drop 160m down and increase 6m ???
Thanks
For any pointers
Paul
G0HEU
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Re: QSX project retirement
On Wed, Mar 19, 2025 at 10:56 AM, KEN G4APB wrote:
Hans said…..Sure! We are currently preparing 500 more of the 10W Linear kit. I have the PCBs on the way with FedEx and everything else is here in hand already!
?
So what are all these going to be used with?
Hi? With all that gain, you can use it for HackRF kind of miliWatt SDR transceivers. Even with U4B baloon Tracker 73 DE muhsin TA1MHS
?
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Hi Sergey
My QMX works great with 1_01_003 firmware. I've calibrated it and SSB reports are very good. Thanks!?
Great!
Few problems:
1. Wattmeter indicator looks like very slowly responding to actual power in antenna. As if it is averaging for couple of seconds...
In version 1_00_003 the power meter reads peaks. Not averages. Then there is also a hold time. It may give the impression of responding slowly. In the display/controls menu you can configure the update rate and the hold time, so that you can customize how the power meter responds. So I suggest in the first instance, having a look at these features and see if you can set it up to your liking.?
2. When I use my usual PA with 1.3 input SWR (measured with NanoVNA) QMX tends to stop transmitting in several seconds due to SWR Protection. And SWR meter displays some big figures which do not exist in reality (checked with my standard SDR transiver and NanoVNA).
I think that there is now some issue with the SWR falsely reading large values at the start of an SSB transmission, which can trigger the SWR protection. I need to investigate this on my return from vacation.?
3. Nothing changes on PTT output during TX. 5V stays on the ring and 0V on the tip.?
If I understand from a different thread, you've got this configured correctly now by using PuTTY to access the hand configuration screen.? 73 Hans G0UPL
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Re: Help with partially fried QMX
Stan,
Thank you very much for your detailed reply. After trying some of your triage steps, I am observing that the GND, +12V, and VCC all exhibit continuity with each other on the compromised SMP board. It is important to note that male pins attached to the main board do not have this continuity, it is only present on the SMP board. I also did continuity checks on Q108 and see that all 3 leads have continuity. I'm unsure if this is a result of the blown component, or if it existed in some sort of compromised state prior to the failure.
I've also gone ahead and double checked all solder joints and looked for solder flakes or other potential areas that could cause unwanted connections. I'm still unable to find a bridge connection but will continue my search as I await my replacement components. Attached are some pictures of the places you suggested I inspect and labeled the pins showing continuity. I've also taken some photos of the area surrounding Q108.
Thank you again for your help and suggestions!
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Niece KA1ULN
Paul K7VIQ
Donald S Brant Jr
Norm - KC1BMD