On 24/08/2023 13:22, Wayne Greene wrote: some stupid and rediculous sound setting in my computer Wayne Not microphone privacy? 73 Alan G4ZFQ
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Dimension 4 is a reliable time sync software.
73
Barb WB2CBA
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All,
The other week my U3s stopped working, it coincided with a nearby thunderstorm. I had been tx'ing wspr and qrss at the time, noticed spots had ceased, checked U3s and just a blank blue screen, the QLG2 lights were all still blinking.
So far, replaced MCU with new one from Hans, changed screen in case this one had burnt out, listened to 27MHz crystal, checked all wiring secure. I have the OCXO fitted, this still heats up.?
I believe that the clock on the SI5351 chip on board the OCXO has stopped working, I will probe the outputs to the MCU and PA this weekend, presumably if the 5351A unit is toast then the mcu will not output any text to screen or output power. Filter relay board fitted.
There's very little that can go wrong on the U3s unlike some other kits, I did have the plain 5351A board but gave it away so unable to do a quick swap and check.
Other than the above any?thought's on other suggestions to look at.
Andy
--
The universe is made up of Protons, Neutrons, Electrons but contains only one M0RON.
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Wayne,
I'm not a Windows guy, but in Linux sometimes the QDX soundcard can get assigned to the wrong device, such as HDMI or something of the sort and it has to be corrected to get it to work with the QDX.
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Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:
<dummyfile.0.part>
I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.
Wayne
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Ok. Sorry Wayne. I am out of ideas, Windows is not my scene.
Maybe someone else can help.
Roger
Get
Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:
I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.
Wayne
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Maybe. I did check them all and they all ohmed out correctly. So, during my troubleshooting, I came across this error again:
I'm still thinking this is either a sound card problem (I know there isn't a separate sound chip; the sound card is embedded in the microcontroller) or some stupid and rediculous sound setting in my computer that I just can't find.
Wayne
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I cannot recommend the ATU-100 Chinese look alike after having built one. If left in the automatic mode, it goes through a re-tuning cycle EVERY time you go into transmit mode even if you do not change the transmit frequency. As has been mentioned, there is no restriction on how bad the SWR can get during the tuning or retuning cycle. In the manual mode, you can step through the inductance values or the capacitance values. BUT if you change from one to the other, the setting of what you changed from will reset to zero. This has been my experience, but your results may vary,
Stephen, KO4CVU
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Re: QMX AGC... any progress?
I posted a couple days ago about a super simple albeit kludged option involving some diodes to limit the voltage on the headphone cable.? Might be worth trying.
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Come on Bruce, get it right.? LOL..? I took a jumper from the RF connector shell and touched the ground connection on the power connector and it fired up.? I normally fill the holes up on the power connector but did not do it this time.? I filled up all 3 holes and all is well.
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Ok. So no output at the dummy load.
I would now start working backwards from the BNC socket centre pin,through the LPFs to the PA, checking for continuity. QDX turned off, ok!
I suspect you have a poorly soldered toroid.
Roger
Get
Correct, pulsing. I didn't hold it the keys down until you suggested that, lol. OK, my dummy load does have a power meter attached. It's analog and the needles do not move at all. I'm not sure about measuring the voltage across the dummy load, though. That I've never done.
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Correct, pulsing. I didn't hold it the keys down until you suggested that, lol. OK, my dummy load does have a power meter attached. It's analog and the needles do not move at all. I'm not sure about measuring the voltage across the dummy load, though. That I've never done.
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Re: #QMX Tweeking QMX output power
#qmx
If you review the as designed turns and inductance and compare with
measured or even calculated inductance, you'll see why L513 turns need
to be tight together or add one turn and spread them. I mod L513 on my
builds and leave the rest of the LPF inductors alone (evenly spread).
To each his own.
-mike/w1mt
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On Thu, Aug 24, 2023 at 7:50?AM howard winwood G4GPF <winwoodh@...> wrote:
Why? Nobody will know the difference, you are chasing unicorns, leave it as it is and use it.
On Wed, 23 Aug 2023, 19:18 Cliff, <ae5zaham@...> wrote:
I ended up adding a turn to the L513 toroid for 20-30M. Gave me an extra watt. Squeezing the turns helps some so figured adding the turn was going the right way. It may not always work that way depending on circuit values.
73,
Cliff, AE5ZA
On Aug 23, 2023, at 13:09, Randy <wrmoore47@...> wrote:
I'm getting a little over 4 watts into a dummy load on 80m and 60m. All other bands are 3.0w-3.5w. I would like to get all bands >=4.0 watts. I've tried compressing and expanding all the low-pass filter torroids. Its difficult to get much movement out of the turns, and hardly any change in output power. For one thing, I guess I wind my torroids fairly tightly, and for another all the LPF torroids are squeezed onto the board such they all touch one or more other components and I can't get some turns moving around the contact with those components.
I probably should be happy with what I've got, but are there other tweeks I should be trying? If anyone has gotten higher output by tweeking the LPFs, let me know which ones and whether you compressed or expanded. Or if you added or removed turns.
73,
Randy, KS4L
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Re: QMX and FT8CN audio issue - strange issue
Did anyone already find a solution for the problem with FT8CN?
Sometimes the first transmission works, often even not the first one.
The QMX just shows two Dots, as a sign of not enough signal and no tx signal at QMX.
Changing the Riese Threshold did not change the behaviour...
With WSJTx on Windows it is more reliable as long as you have the "Power Slider" on 100%, otherwise same situation with the two dots and no transmission
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By 'a single slow flash', I am assuming you mean 'pulsing', while
you hold down 't'.
Good.
Does your dummy load have a power meter attached, or can you
measure the voltage across the dummy load when transmitting? That
will give an idea of whether your signal is getting all the way
out to the antenna socket.
Roger
On 24/08/2023 07:52, Wayne Greene
wrote:
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I get a momentary single fast flash on the LED and PTT Signal in
putty shows on, then off when I run a PTT test. I get a single
slow flash on the LED when I run a PTT and Transmit test and the
PTT Signal and Transmitter shows on, then off.
Wayne
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Re: New QRP-Labs product idea? A QMX/QDX based digimode / cat interface?
On Thu, Aug 24, 2023 at 07:48 AM, Scott W8RBY wrote:
Lex,
Maybe this is what you are dreaming of?
73
Scott
?Yeah...that Digirig is fantastic. I have one for my G90.??
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I get a momentary single fast flash on the LED and PTT Signal in putty shows on, then off when I run a PTT test. I get a single slow flash on the LED when I run a PTT and Transmit test and the PTT Signal and Transmitter shows on, then off.
Wayne
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Hi All,
First time post in this group for me though I have been lurking for some time ?
Having recently discovered QRP Labs and being immediately impressed with the engineering within the QMX (congratulations Hans ??) I decided to take the plunge and whilst waiting to start my QMX build I have been musing over a suitable portable power supply.
For some time now I have constructed battery packs for my home brew projects because it gives me full control over the capacity and the scope of inbuilt protection, I decided in this case that it would also be nice to include some form of fast acting solid state over current trip i.e. an electronic fuse in addition to the traditional battery management / protection board. ?I was about to start recalculating component values for a design I had used previously but decided also to have a look at what might be available at low cost commercially and in doing so happened across this device?? Given the 1A/2A selectable trip levels and the relatively low price I’m going to order one and have a play with it. ?I thought in the meantime it might be of interest to others as the current range would seem to be compatible with QRP current drain.
73 de Clive, G4KCM
SAFETY NOTE… ?I have a background in industrial electronics and control systems. Given the energy involved if you do not have appropriate skills it is safer to avoid working on high capacity batteries. ?My wife is a fire fighter in London and the recent up kick in battery related ‘incidents’, be it EVs or in domestic premises, is scary. ?I predict it to get worse as competition increases in the EV sector!
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Willie - yeah its kinda weird. Even if I go to clock settings and force an update it can sometimes not sync, even trying different servers. I assumed a wi-fi lag
Jim - JTsync sounds cool. Except for ft-8 I really dont care if the clock is off a few seconds.?
--
regards,
Bryan, N0LUF
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Re: #QMX Tweeking QMX output power
#qmx
Why? Nobody will know the difference, you are chasing unicorns, leave it as it is and use it.
I ended up adding a turn to the L513 toroid for 20-30M. Gave me an extra watt. Squeezing the turns helps some so figured adding the turn was going the right way. It may not always work that way depending on circuit values.
I'm getting a little over 4 watts into a dummy load on 80m and 60m. All other bands are 3.0w-3.5w. I would like to get all bands >=4.0 watts.? I've tried compressing and expanding all the low-pass filter torroids. Its difficult to get much movement out of the turns, and hardly any change in output power. For one thing, I guess I wind my torroids fairly tightly, and for another all the LPF torroids are squeezed onto the board such they all touch one or more other components and I can't get some turns moving around the contact with those components.
I probably should be happy with what I've got, but are there other tweeks I should be trying? If anyone has gotten higher output by tweeking the LPFs, let me know which ones and whether you compressed or expanded. Or if you added or removed turns.
73, Randy, KS4L
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Re: New QRP-Labs product idea? A QMX/QDX based digimode / cat interface?
Lex,
Maybe this is what you are dreaming of?
73
Scott
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Barb WB2CBA
M0RON
Clive - G4KCM