开云体育

ctrl + shift + ? for shortcuts
© 2025 开云体育
  1. QRPLabs
  2. Messages
Expanded Topics Messages Polls
Date
Re: Another QMX+ became SSB capable

 

Hi Jack,
?
Did you go through the calibration cycle or just run with default calibration settings?
?
It's just that I can get my QMX+ to do a complete successful calibration run and resulting in distorted audio.
Running the rig with default calibration settings (returned it to factory default settings), I don't get audio distortion, but mic volume is low. Increasing the mic gain then generates undesirable background noise. But that's a desperate challenge is need to resolve...
?
Cheers,
?
Mel. M0KMD
Re: RTC battery mistake

 

On Thu, Apr 3, 2025 at 11:50 PM, Paul G8MAD wrote:
The problem for me is that no matter what the ‘Real time clock’ is set to at power down the clock is always 00:00 at power up.
What is the voltage on the VBAT line?? This is available on JP218, the three pin connector under the GPS module, the pin labelled 'Batt'.? It needs to be about 3V from the CR2032 battery, even when the power is off.
?
Chris, G5CTH
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

From my experience, it seems random. I got it to complete to about 2000 on one occasion after tinkering with the band settings for 20m. Without changing anything else, the next run only got it about 600 and was not able to get another complete run.
You can see my plots just a few posts below. /g/QRPLabs/message/142310
?
@Hans, any theories as to why this is happening?
?
Cheers.
?
Mel. M0KMD.
?
Re: QMX+ All LPF Sweeps Are Bad #lpf #QMXplus

 

The LPF graphs give the impression that the LPFs aren't working, that there is a short bypassing all the LPFs regardless of the band selected.

One check would be to look for the 3rd harmonic being transmitted.? Do you have a receiver with a waterfall display? A SDR perhaps?? Try a test transmission into a dummy load and see if you can receive it at the fundamental frequency and 3 times that, for example 7.074 MHz and 21.222 MHz.? The dummy load will probably radiate enough that you can receive the signal locally.? If you get a significant signl on the 3rd harmonic then the LPFs aren't working.
?
Difficult to see why, other than some major miswiring.
?
Chris, G5CTH
Re: SWR and PWR does not show lcd

 

"Note that the receive S-meter and AGC meter do not work in DIGI mode, only in CW mode, because AGC is only implemented for CW".
?
Now it's clear.
The tests are in DIGI mode, that's why SWR & Power don't appear during TX.
Thanks
Miguel EC7ZV
Re: RTC battery mistake

 

The internal GPS sets my clock within a few minutes. The problem for me is that no matter what the ‘Real time clock’ is set to at power down the clock is always 00:00 at power up.
QMX+ low(ish) power output

 

Hi all, first off, thanks to Jeff Moore who helped my QMX midband, and noticed my silly mistakes.?

Second off, I've just finished a QMX plus and am fairly happy with it except for the fact im getting 2-3 watts, leaning closer to 2 on all bands except 160m. I've reflowed all LPFs, PA, and tri toroids. Any ideas on where to look next? I dont think i have any failed finals or shorts.?
Re: QCX+ Menu 8.5 Ref frq

 

You can do some trial and error yes. ?
?
However all the QRP labs TCXOs I’ve seen are within a few HZ of 25MHz and that’s a beat note /error you couldn’t hear/zero sufficiently accurately by ear?
Re: New Build, No Flash Drive found #build #building #qmx

 

On Wed, Apr 2, 2025 at 02:09 PM, VA2OJD wrote:
Would that be indicative of anything underlying problems or is that simply the screen's nature??
I think it indicates something very wrong.? Has it always been this bright?? The screen backlight, properly working, is brighter than some prefer, but it is far from being bright enough to wash out the LCD.? I have 4 QMX/QMX+ devices of different hardware versions, and the display works similarly on all of them, with a full range of contrast adjustment.
?
It would be helpful to measure the voltage on pins 15 and 16 of the display connector (the backlight pins) or the resistor.? Is it 5v?? Or do you somehow have a higher voltage there?? If it is 5V, perhaps the particular display you have was intended for 3V operation, and I would put an even larger value resistor in to reduce the current.?
QMX+ All LPF Sweeps Are Bad #lpf #QMXplus

 

I have assembled and have working a QMX+, with one caveat;? all of the LPF sweeps are bad.
?
The audio filter sweeps, RF filter sweeps, image sweeps, and SWR sweeps look reasonable, although on a couple of bands the SWR sweeps aren't flat across the entire bandwidth swept, but were always good in the ham band frequencies.? The I/Q sweeps all looked good except for 160 Meters where the phases were in sync for some reason.? Not really a problem for me, I don't own that much wire.
?
Here's the real problem.? All of the LPF sweeps are bad.? For example:
?
?
0 ?| ? ? ? ? ?* .* ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?* .* ?* ?* ? ?. ?* ?* ?* ? .
? ?| ?* ? ?* ?* .* ?* ?* ?* .* ?* ?* ?* ?* ? ?* ?* ?* .* ?* ?* ? ?* ?* ?* ?* ?*.
? ?| ?* ?* ** * .* ?* ?* ?* .* ** ** ** ** ** ** * ?* .* ?* ?* ?* ** * ?* ?* ?**
? ?| ** ** ** **.* ?* ?* ?* ** ** ** ** ** ** ** ** * .* ?* ** ** ** * ?* ?* * *
? ?| ** ** ** **.** * ** ** ** ** ** ** ** ** ** ** **.* ** ** ** ** ** * ** * *
? ?| ** ** ** **.***|*** ** ** ** ** ** ** ** ** ** *** *** ** ** ** **** ** * *
? ?| ** ** ** *** **|** *** ** ** ** ** ** ** ** *** ** *** ** ** ** *** *** * *
? ?| ** ** *** ** **|** ** ** ** ** *** ** ** *** ** ** ** ** *** *** ** ** ** *
? ?| * *** *** ** **|** ** ** ** ** ** **.*** *** ** ** ** ** *** *** ** ** ** *
? ?| * * ?* ?* ?* **|** ** ** * ?* ?* ?* .* ?* ?* ?* ** ** ** * ?*. * ?* ** ** *
? ?| * * ?* ?* ?* ?*|* ?* ?*. * ?* ?* ?* .* ?* ?* ?* ?* * ?* ?* ?*. * ?* * ?* ?*
? ?| * * ?* ?* ?* ? |* ?* ?*. * ?* ?* ?* .* ?* ?* ?* ?* * ?* ?* ?*. * ?* * ?* ?*
? ?|* ?* ?* ?* ?* ? | ? * ?*. * ?* ?* ?* .* ?* ?* ?* ?. ? ?* ?* ?*. * ? ?* ?* ?*
? ?|* ?* ?* ?* ?. ? | ? ? ?*. * ?* ?* ?* .* ?* ?* ?* ?. ? ?* ?* ?*. * ? ? ? * ?*
? ?|* ?* ?* ?* ?. ? | ? ? ?*. * ?* ?* ?* .* ?* ?* ? ? . ? ?* ?* ?*. * ? ? ? * ?*
? ?|* ?* ?* ?* ?. ? | ? ? ? . ? ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?*. ? ? ? ? * ?*
? ?|* ?* ?* ? ? . ? | ? ? ? . ? ? ? ? ?* .* ?* ? ? ? ?. ? ? ? ? ?*. ? ? ? ? ? ?*
? ?|* ? ? * ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? * ? ? ? ?. ? ? ? ? ?*. ? ? ? ? ? ?*
? ?|* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
? ?|* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
-8 |* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
? ? ----------------------------------------------------------------------------
? ? ? ? ? ? ? ? 6 ? ? ? ? ? 9 ? ? ? ? ? 12 ? ? ? ? ? 15 ? ? ? ? ?18 ? ? ? ? ? 21
?
?
0 ?|. ? ? ? ?*. * ?* ? ? . ? ? ? ? . ? ? ? ? . ? ? ? ? ?. ? ? ? ? . ? ? ? ? .
? ?|.* ? ? ? *. * ?* ?* ?. ? ?* ?* . ? ? * ?*. * ? ? ? *. * ? ? ? * ?* ? ? ?.*
? ?|.* ?* ? ?** * ?* ?* ?. * ?* ?* .* ? ?* ?*. * ?* ? ?*. * ?* ? ?* ?* ? ?* .*
? ?|.* ?* ?* ** * ?* ?* ?. * ?* ?* .* ? ?* ?*. * ?* ? ?*. * ?* ? ?* ?* ?* * .*
? ?|** ** ** ** **** ** ** ** * ?* ** ? ?* ?*. * ?* ? ?*. * ?* * ?* ?* ?* **.*
? ?|** ** ** ** **** ** ** ** * ?* ** ** ** *.** ** ** ** * ** ** ** * ** **.*
? ?|** ** ** ***|*** ** ** ** **** ** ** ** *.** ** ** ** * ** ** ** * ** **.*
? ?|** ** ** ***|** *** ** ** **** ** ** *** *** ** ** **** ** ** **** ** **.**
? ?|* *** *** .*|** *** ** *** *** ** ** *** *** ** ** *** *** ** *** *** *** *
? ?|. *** *** .*|** ** *** *** ** *** *** ** ** *** *** ** *** ***.** *** *** *
? ?|. ** ** * .*| ? * ?*** *** ** ** **** ** ** *** *** ** ** ****.** *** *** **
? ?|. * ?* ?* .*| ? * ?* ** ?* ** ** ** * ?* * ?** ** * .* * ?* ?*.** ** * ?* *
? ?|. * ?* ?* .*| ? * ?* .* ?* ** *. * ?* ?* * ?* ?* ?* .* * ?* ?*. * * ?* ?* *
? ?|. * ?* ?* . | ? * ?* .* ?* ? ?*. * ?* ?* * ?* ?* ?* .* * ?* ?*. * * ?* ?* *
? ?|. * ?* ?* . | ? * ?* .* ?* ? ?*. * ?* ? ?* ?* ?* ?* . ?* ?* ?*. * * ?* ?*
? ?|. * ?* ?* . | ? ? ?* .* ?* ? ?*. * ?* ? ?. ?* ?* ?* . ?* ?* ?*. ? * ?* ?*
? ?|. * ?* ?* . | ? ? ?* .* ?* ? ?*. * ?* ? ?. ?* ?* ?* . ? ? * ?*. ? * ?* ?.
? ?|. ? ?* ?* . | ? ? ?* .* ? ? ? *. * ?* ? ?. ?* ?* ?* . ? ? * ?*. ? ? ?* ?.
? ?|. ? ?* ? ?. | ? ? ?* .* ? ? ? ?. * ?* ? ?. ? ? * ?* . ? ? * ?*. ? ? ?* ?.
? ?|. ? ? ? ? . | ? ? ? ?.* ? ? ? ?. * ? ? ? . ? ? * ? ?. ? ? * ? . ? ? ?* ?.
-7 |. ? ? ? ? . | ? ? ? ?.* ? ? ? ?. ? ? ? ? . ? ? * ? ?. ? ? ? ? . ? ? ?* ?.
? ? ----------------------------------------------------------------------------
? ?16 ? ? ? ?24 ? ? ? ? 32 ? ? ? ?40 ? ? ? ?48 ? ? ? ? 56 ? ? ? ?64 ? ? ? ?72
?
All of the other bands exhibit a similar pattern.
?
I tried looking for something common to all of the filters, but nothing I came up with made any sense given that the other sweeps were 'normal'.
?
Since everything looked OK except for the LPF sweeps, I decided to perform a real-world test.? I hooked it up to my EFHW at 20 feet and worked Oklahoma on 40 Meters FT8, so the transceiver is working.? I don't have the necessary test equipment to check the spectral purity of the output signal so I'm hesitant to continue using it on the air until I resolve this problem.
?
I tried searching for a solution both here and with Google and read a lot about fixing issues I don't have, but nothing that pointed me in the right direction.
?
Thanks all for the great ideas I'm about to receive.
?
Andy
WB9YXA
All LPF Sweeps Are Bad

 

I have assembled and have working a QMX+, with one caveat;? all of the LPF sweeps are bad.
?
The audio filter sweeps, RF filter sweeps, image sweeps, and SWR sweeps look reasonable, although on a couple of bands the SWR sweeps aren't flat across the entire bandwidth swept, but were always good in the ham band frequencies.? The I/Q sweeps all looked good except for 160 Meters where the phases were in sync for some reason.? Not really a problem for me, I don't own that much wire.
?
Here's the real problem.? All of the LPF sweeps are bad.? For example:
?
?
0 ?| ? ? ? ? ?* .* ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?* .* ?* ?* ? ?. ?* ?* ?* ? .
? ?| ?* ? ?* ?* .* ?* ?* ?* .* ?* ?* ?* ?* ? ?* ?* ?* .* ?* ?* ? ?* ?* ?* ?* ?*.
? ?| ?* ?* ** * .* ?* ?* ?* .* ** ** ** ** ** ** * ?* .* ?* ?* ?* ** * ?* ?* ?**
? ?| ** ** ** **.* ?* ?* ?* ** ** ** ** ** ** ** ** * .* ?* ** ** ** * ?* ?* * *
? ?| ** ** ** **.** * ** ** ** ** ** ** ** ** ** ** **.* ** ** ** ** ** * ** * *
? ?| ** ** ** **.***|*** ** ** ** ** ** ** ** ** ** *** *** ** ** ** **** ** * *
? ?| ** ** ** *** **|** *** ** ** ** ** ** ** ** *** ** *** ** ** ** *** *** * *
? ?| ** ** *** ** **|** ** ** ** ** *** ** ** *** ** ** ** ** *** *** ** ** ** *
? ?| * *** *** ** **|** ** ** ** ** ** **.*** *** ** ** ** ** *** *** ** ** ** *
? ?| * * ?* ?* ?* **|** ** ** * ?* ?* ?* .* ?* ?* ?* ** ** ** * ?*. * ?* ** ** *
? ?| * * ?* ?* ?* ?*|* ?* ?*. * ?* ?* ?* .* ?* ?* ?* ?* * ?* ?* ?*. * ?* * ?* ?*
? ?| * * ?* ?* ?* ? |* ?* ?*. * ?* ?* ?* .* ?* ?* ?* ?* * ?* ?* ?*. * ?* * ?* ?*
? ?|* ?* ?* ?* ?* ? | ? * ?*. * ?* ?* ?* .* ?* ?* ?* ?. ? ?* ?* ?*. * ? ?* ?* ?*
? ?|* ?* ?* ?* ?. ? | ? ? ?*. * ?* ?* ?* .* ?* ?* ?* ?. ? ?* ?* ?*. * ? ? ? * ?*
? ?|* ?* ?* ?* ?. ? | ? ? ?*. * ?* ?* ?* .* ?* ?* ? ? . ? ?* ?* ?*. * ? ? ? * ?*
? ?|* ?* ?* ?* ?. ? | ? ? ? . ? ?* ?* ?* .* ?* ?* ? ? . ? ? ? * ?*. ? ? ? ? * ?*
? ?|* ?* ?* ? ? . ? | ? ? ? . ? ? ? ? ?* .* ?* ? ? ? ?. ? ? ? ? ?*. ? ? ? ? ? ?*
? ?|* ? ? * ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? * ? ? ? ?. ? ? ? ? ?*. ? ? ? ? ? ?*
? ?|* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
? ?|* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
-8 |* ? ? ? ? ? . ? | ? ? ? . ? ? ? ? ? ?. ? ? ? ? ? ?. ? ? ? ? ? . ? ? ? ? ? ?.
? ? ----------------------------------------------------------------------------
? ? ? ? ? ? ? ? 6 ? ? ? ? ? 9 ? ? ? ? ? 12 ? ? ? ? ? 15 ? ? ? ? ?18 ? ? ? ? ? 21
?
?
0 ?|. ? ? ? ?*. * ?* ? ? . ? ? ? ? . ? ? ? ? . ? ? ? ? ?. ? ? ? ? . ? ? ? ? .
? ?|.* ? ? ? *. * ?* ?* ?. ? ?* ?* . ? ? * ?*. * ? ? ? *. * ? ? ? * ?* ? ? ?.*
? ?|.* ?* ? ?** * ?* ?* ?. * ?* ?* .* ? ?* ?*. * ?* ? ?*. * ?* ? ?* ?* ? ?* .*
? ?|.* ?* ?* ** * ?* ?* ?. * ?* ?* .* ? ?* ?*. * ?* ? ?*. * ?* ? ?* ?* ?* * .*
? ?|** ** ** ** **** ** ** ** * ?* ** ? ?* ?*. * ?* ? ?*. * ?* * ?* ?* ?* **.*
? ?|** ** ** ** **** ** ** ** * ?* ** ** ** *.** ** ** ** * ** ** ** * ** **.*
? ?|** ** ** ***|*** ** ** ** **** ** ** ** *.** ** ** ** * ** ** ** * ** **.*
? ?|** ** ** ***|** *** ** ** **** ** ** *** *** ** ** **** ** ** **** ** **.**
? ?|* *** *** .*|** *** ** *** *** ** ** *** *** ** ** *** *** ** *** *** *** *
? ?|. *** *** .*|** ** *** *** ** *** *** ** ** *** *** ** *** ***.** *** *** *
? ?|. ** ** * .*| ? * ?*** *** ** ** **** ** ** *** *** ** ** ****.** *** *** **
? ?|. * ?* ?* .*| ? * ?* ** ?* ** ** ** * ?* * ?** ** * .* * ?* ?*.** ** * ?* *
? ?|. * ?* ?* .*| ? * ?* .* ?* ** *. * ?* ?* * ?* ?* ?* .* * ?* ?*. * * ?* ?* *
? ?|. * ?* ?* . | ? * ?* .* ?* ? ?*. * ?* ?* * ?* ?* ?* .* * ?* ?*. * * ?* ?* *
? ?|. * ?* ?* . | ? * ?* .* ?* ? ?*. * ?* ? ?* ?* ?* ?* . ?* ?* ?*. * * ?* ?*
? ?|. * ?* ?* . | ? ? ?* .* ?* ? ?*. * ?* ? ?. ?* ?* ?* . ?* ?* ?*. ? * ?* ?*
? ?|. * ?* ?* . | ? ? ?* .* ?* ? ?*. * ?* ? ?. ?* ?* ?* . ? ? * ?*. ? * ?* ?.
? ?|. ? ?* ?* . | ? ? ?* .* ? ? ? *. * ?* ? ?. ?* ?* ?* . ? ? * ?*. ? ? ?* ?.
? ?|. ? ?* ? ?. | ? ? ?* .* ? ? ? ?. * ?* ? ?. ? ? * ?* . ? ? * ?*. ? ? ?* ?.
? ?|. ? ? ? ? . | ? ? ? ?.* ? ? ? ?. * ? ? ? . ? ? * ? ?. ? ? * ? . ? ? ?* ?.
-7 |. ? ? ? ? . | ? ? ? ?.* ? ? ? ?. ? ? ? ? . ? ? * ? ?. ? ? ? ? . ? ? ?* ?.
? ? ----------------------------------------------------------------------------
? ?16 ? ? ? ?24 ? ? ? ? 32 ? ? ? ?40 ? ? ? ?48 ? ? ? ? 56 ? ? ? ?64 ? ? ? ?72
?
All of the other bands exhibit a similar pattern.
?
I tried looking for something common to all of the filters, but nothing I came up with made any sense given that the other sweeps were 'normal'.
?
Since everything looked OK except for the LPF sweeps, I decided to perform a smoke test.? I hooked it up to EFHW at 20 feet and worked Oklahoma on 40 Meters FT8, so the transceiver is working.? I don't have the necessary test equipment to check the spectral purity of the output signal so I'm hesitant to continue using it on the air until I resolve this problem.
?
I tried searching for a solution both here and with Google, read a lot about fixing issues I don't have but nothing that pointed me in the right direction.
?
Thanks all for the great ideas I'm about to receive.
?
Andy
WB9YXA
?
?
Re: QDX HB Build Notes #qdx #9v #mods

 

I have a working QDX, REV-5 pcb, low band and would like to make it more bullet proof with the LTN20069 heatsink and 4 of the TN0110 transistors. I haven't seen any pictures of that. Are there some anywhere? My understanding is that I remove the BS170s and insert the TN0110s, but when folded down, would present their flat faces upward, on which the LTN20069 would lay, complete with a 3mm hole in the center to sandwich it all together. I have a teensie 12v fan to sit on top of the case, with proper holes in it.
?
I need more robustness due to using the QDX in the car, which can get hot. The TN0110s allow for higher voltage use, but I stick to 11.1V batteries because mobile antennas for HF whip around and the swr varies, adding further heat on the finals.
?
Any errors in my plan? I'll post pictures when I'm done.
?
Tnx,
W7LS
Re: SSB audio distortion #qmx #SSB Firmware beta 1_01_003 release #qmx #ssb

 

On Thu, Apr 3, 2025 at 02:02 AM, Mehmet Dinch wrote:
does it complete on consecutive runs for the same band or is just, seemingly, random?
I usually didn't try again after I got it to work.? So I don't really know.? In fact, I have no idea why changing the band settings would help it to work - I don't think it has a direct relationship - probably something more subtle.? But without changing band settings, it would repeat the same bad run each time.
Re: QMX and power bank PD

 

I recommend using your voltage monitor to see what happens on the port with your 12V trigger cable, when you plug any one of the other ports into something.? Mine reduces the 12V port to 5V if I plug in a 5V device to its 2nd port.? Hopefully yours has independent port voltage switching.?
Stan
Re: SWR and PWR does not show lcd

 

On Thu, Apr 3, 2025 at 08:51 AM, <ec7zv0@...> wrote:
What does Hans's comment mean?
That there's no TX PWR & SWR display on the QMX+?
Hans' comment means that you need to read the QMX/QMX+ operations manual, and the correct data is there.
Yes, the power and SWR meter work on both QMX and QMX+.
If they are not working, it is possible that you didn't use the display/controls menu to properly enable them.
Or perhaps your T507 transformer is not properly soldered in, such that the CPU can't measure any forward/reflected power.
I have never seen the indicators malfunction in any of the firmware versions I have used, on either my QMX or QMX+ units, but it does depend on the T507 hardware is working properly.
?
Note that the receive S-meter and AGC meter do not work in DIGI mode, only in CW mode, because AGC is only implemented for CW.
Stan KC7XE
Re: QMX won’t power up

 

On Thu, Apr 3, 2025 at 10:26 AM, <k2cwcqrp@...> wrote:
a 12 VDC power adapter measuring 13.4 VDC output at open circuit
If this is the power supply you have been using to operate your QMX, that is what caused the problem.? 13.4V is too high a voltage for QMX, as explained (in boldface red) in the assembly and operations documents.? Hans recommends using 2 simple silicon diodes in series in the power cable to lower the voltage, or you can use a buck or buck/boost converter.? Using 13.4V will eventually cause problems, like possible damage to your finals and to your power supplies.? If the supply voltage goes down lower than 12V during TX, it is still a problem, since it will bounce back up to a too-high voltage.? And if it droops to lower than 12V during receive, then it doesn't have the current capacity to properly power your QMX, and will cause operational problems.?
?
And if you weren't using that supply, good.? But you shouldn't use it for diagnosing the problem, either, unless you can turn it down to about 7V and set a 250mA current limit.
?
But back to the current problem -
If all is operating correctly, your current while pressing the button should go up to about 200mA for about 1 sec, then settle down to about 100mA after the processor starts up the SMPS supplies.? None of that appears to be happening.? Which means the 3.3V linear supply isn't even turning on - and that just requires hardware switching, so something is definitely broken.?
?
If you are up to doing some measurements, disassemble the QMX enough to remove the two power supply units, and test them independently using the procedure in the wiki. ?/g/QRPLabs/wiki/37128.? If one or both of these is bad (and you don't want to try fixing SMD stuff) you can order a new set from qrp-labs for $10.
?
Also on the main board, measure the resistance of the 12V, Vcc and Vdd pins with respect to board ground and with respect to each other.? These should all be at least a few k-ohms, if any is instead just a few ohms, that means something on the main board is shorting and needs to be found and fixed before installing and using new/fixed power supplies.
?
Or you can punt and send it to Jeff W1NC and he will fix it for you - but where's the fun in that?
Good luck - let us know how it goes.
Stan KC7XE
?
QCX+ Menu 8.5 Ref frq

 

I would like to know if I can apply the following procedure to calibrate the Ref frq without GPS?
Using a QCX+ 20M Band I would go to WWV 15MHz and read precisely the frequency for a zero beat. If I read 15.003.00 could I modify menu 8.5 to read 25.005.000 with the TCXO and have a more precise QCX+?
73 - Pierre - FK8IH
Re: QMX+ Volume

 

On Wed, Apr 2, 2025 at 09:07 AM, Martin DK3UW wrote:
I finde, that the min. audio volume is still quite high but could not find a setting to alter that
There are three primary audio gain controls.? ?
?
The first is in Band Configuration.? Audio level set here is applied very early in the processing, and affects I/Q output as well as the rest of the audio path. [I think you earlier increased this value to increase the level into wsjt-x.]
?
The second is the volume control knob, which as a gain range of 0-200dB.? The third is in the Audio menu, an audio attenuator that can be set in steps from 0 to 100dB.? I think both of these only affect the audio output jack.
?
For SSB, there is are additional audio gain parameters in the agc settings.? The CW mode agc also has an 'S9 sounds like' setting which is essentially an audio gain control.?
?
Stan KC7XE?
?
?
Re: QMX+ Power Output Question

 

Hi,
The power output list is fine.?
?It is what it is, and if you build another one,?
it will be just like that. Which is wonderful!
73,
George
K3GK
Re: QMX+ Power Output Question

 

Yep. Ran into that too.

Appreciate the possible alternative work around.

GREG


On Thu, Apr 3, 2025 at 8:23 PM, Mark K9TR via groups.io
<venchant@...> wrote:
Greg,
?
I had to download the zip file version of Hamlib, that got it by Mcaffee.? Unzipping the file just to get the single .dll file I needed gave Malwarebytes a fit, so I disabled the anti-malware app, got my .dll and just copied it over to the Hamlib folder.
?
73! Mark K9TR
121 - 140 of 140456