Re: Logging pad idea for my "QHX"
#qmx
Pretty neat idea, Yoon! You're giving the KH1 a run for the money! -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.?
-Jules Renard
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It sounds as if the left encoder is not working properly. Check on the terminal diagnostics screen. there are a number of RED items. when you successfully exercise each of these items, the RED will go away. A strong suspect is that the left (volume) encoder is not responding to clockwise turning. This might be a bad connection from the encoder to the encoder sub assembly or a bad connection from the sub assembly to the main board. If you can check the continuity of those paths, you might find the issue.? Or you can just PM Hans and see what he can do for you. -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.?
-Jules Renard
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Re: QMX Rev 2 80-20 Layout Diagram Question
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On Wed, 3 Jan 2024, 02:26 Burt Wizeman, < burt@...> wrote: Please pardon the ugliness from the removal of one solder bridge and the attempt to remove another. I bridged the empty, un-soldered pad to C515.? If the Layout Diagram is from the top, I have a problem, if from the bottom, both are ground.? Is the Layout Diagram from top or bottom?? I have since switched to a smaller diameter solder!
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Thanks?
Burt
K4SRQ
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Re: QMX HW Diagnostics: No TX?
I think that will work ,Todd. ?You will be adding a tiny inductance in the source of Q507 because of the length of the new lead. You might plan for an additional 100nF capacitor from source to ground, very local to the source pin, should it be needed. It may be good insurance to install it from the outset.
Good luck! JZ KJ4A
On Tue, Jan 2, 2024, 5:53?PM Todd W2TEF < w2tef@...> wrote: Hmmm.. that's a brilliant observation. Just wrap a small line around the edge of the board (convenient with the MOSFET in the corner).?
Logically enough, R507 and C507 are next to each other on the PCB. I drew arrows pointing to the sides where they're connected. There is 12v at that point. That's where a jumper to the AOD403 sink should be connected. And there's a small work area there that's relatively clear.??
Thank you for the calm observation and continuing encouragement!
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Re: QMX Clicking CW Sound
Hey all, I just found out that the RING connection on the output jack is connected to PIN 5 of the processor in the Ultra PicoKeyer. I am not sure why this is connected, and it is not shown as a connection on my 2017 schematic, but it definitely IS there!? Anyway, if you cut this trace from the RING of Output Jack to PIN 5 of the processor, the keying issue goes away with the KX2 and I would presume, other rigs with the same issue. -- 73, Dan? NM3A There are moments when everything turns out right .... Don't let them alarm you; they pass.?
-Jules Renard
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Re: QMX HW Diagnostics: No TX?
Hmmm.. that's a brilliant observation. Just wrap a small line around the edge of the board (convenient with the MOSFET in the corner).?
Logically enough, R507 and C507 are next to each other on the PCB. I drew arrows pointing to the sides where they're connected. There is 12v at that point. That's where a jumper to the AOD403 sink should be connected. And there's a small work area there that's relatively clear.??
Thank you for the calm observation and continuing encouragement!
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Re: QMX HW Diagnostics: No TX?
Todd?
I'm pretty sure you can recover gracefully. Check to make sure that the resistor and capacitor remain connected to 12V. There? may be a way to pick up +12V for the source lead right at one of those components. The board drawing in the documentation may also be a help to you.
You can send the device to Jeff Moore for repair if you are uninterested on attempting the repair yourself.
JZ
On Tue, Jan 2, 2024, 4:16?PM Todd W2TEF < w2tef@...> wrote: Hmmm... Good news and bad news.
1. I took voltage readings from Q507 (AOD403) with my 12v QMX powered on as follows:
Source: 11.98v
Gate: 11.88v
Drain: 6.6v
With the device powered off, I measured a 49.8ohm resistance between the source and the gate.?
2. Then I proceeded to remove the Gate (left-most) pin of Q507 from its pad, so that it was isolated in mid-air. Powered on, I measured:
Source: 11.97v
Gate: 11.97v
Drain: 6.6v
Powered off, I still measured 50ohms between Source and Gate and, incidentally, 5.58k across R507 (which had been reading 50ohms).
The voltage into the transmitter was still high at 5.8v in receive and in transmit. I had kind of expected that to fall to 0 with Q507 half-way removed.?
3. Therefore I determined to lift the other leg of Q507. Which I did, resulting in a transmitter voltage of .6-.9v. Beautiful! It seems to me there's a pretty significant chance that Q507 really is the culprit, having been shorted to the transformer (T501) when I initially powered on.
Bad news: In try to lift that second leg of Q507, I plugged in my (smart!) soldering iron but neglected to ensure I had turned it on. I lifted the pad on a perfectly cold connection. If only the operator was as smart as the soldering iron (a nifty Pinecil 2). Argh!
So, my new question: is there any point in ordering a replacement AOD403? Or is my QMX now a receive-only device and expensive code oscillator?
Presently two of the three pads are still good. I wonder if I could make it work by tacking a 5.6k resistor and a 0.1u capacitor on top of the device. I would need to find myself a convenient ground and, more challenging yet, a +12V source.
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Logging pad idea for my "QHX"
#qmx
I don't think it is just me that uses QMX as an HT, so there can be different versions of QHX. This is about my version of QHX, integrated with the 2s 14500 batteies and the micro-size single lever paddle.
I didn't think I would need a log tray like KH1's, because I've been using my phone's note app for writing the logs. But when my one hand is already occupied by the HT and the other needs to stand by for cw keying, using the smartphone for logging is not convenient anymore. So here's a quick dirty prototype made with a thin plastic sheet. Someone would make a much nicer one with a 3D printer, I guess.
When it is closed (folded) it works as the screen protector (partially protecting the micro cw paddle as well) and also the volume button stopper to prevent the radio from accidently turning on. The metal hinge is scavenged from an old eyeglasses case, and maybe I can attach a steel pen with some magnet on it.
Opening it up, I can use it as the logging pad, though the pad is small and not so comfortable for writing anything well. The clear plastic sheet is from some product packaging, and it is not very firm. Some harder material would be more stable for writing on. For the logging sheets, I would be using Post-it cut for the size. Maybe a few sheets would be enough for about 10 QSO's or an hour of handheld walkabout operation.
73,
Yoon KM6KJI
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You might also use the terminal mode to run the diagnostic to be
sure that the encoder and all are working... That's all described
in the assembly manual.
Also, when you power on, is it showing you version 14?
Paul -- AI7JR
On 1/2/24 16:07, Evan Hand wrote:
Juan,
Maybe the issue is the earphone jack?? Can you try connecting a
speaker to the board connections of the jack?? The other
possibility is the audio amplifier has failed.? Do you have a way
to connect an earphone to the output of either C420 or C421?
73
Evan
AC9TU
--
Paul -- AI7JR
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Re: QMX HW Diagnostics: No TX?
Hmmm... Good news and bad news.
1. I took voltage readings from Q507 (AOD403) with my 12v QMX powered on as follows:
Source: 11.98v
Gate: 11.88v
Drain: 6.6v
With the device powered off, I measured a 49.8ohm resistance between the source and the gate.?
2. Then I proceeded to remove the Gate (left-most) pin of Q507 from its pad, so that it was isolated in mid-air. Powered on, I measured:
Source: 11.97v
Gate: 11.97v
Drain: 6.6v
Powered off, I still measured 50ohms between Source and Gate and, incidentally, 5.58k across R507 (which had been reading 50ohms).
The voltage into the transmitter was still high at 5.8v in receive and in transmit. I had kind of expected that to fall to 0 with Q507 half-way removed.?
3. Therefore I determined to lift the other leg of Q507. Which I did, resulting in a transmitter voltage of .6-.9v. Beautiful! It seems to me there's a pretty significant chance that Q507 really is the culprit, having been shorted to the transformer (T501) when I initially powered on.
Bad news: In try to lift that second leg of Q507, I plugged in my (smart!) soldering iron but neglected to ensure I had turned it on. I lifted the pad on a perfectly cold connection. If only the operator was as smart as the soldering iron (a nifty Pinecil 2). Argh!
So, my new question: is there any point in ordering a replacement AOD403? Or is my QMX now a receive-only device and expensive code oscillator?
Presently two of the three pads are still good. I wonder if I could make it work by tacking a 5.6k resistor and a 0.1u capacitor on top of the device. I would need to find myself a convenient ground and, more challenging yet, a +12V source.
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Juan,
Maybe the issue is the earphone jack?? Can you try connecting a speaker to the board connections of the jack?? The other possibility is the audio amplifier has failed.? Do you have a way to connect an earphone to the output of either C420 or C421?
73
Evan
AC9TU
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Thanks for your responses Ron and Evan. I did what Ron told me to do and I also did the factory reset but the volume control still doesn't work, that is, I can't raise or lower the volume from the volume knob.
73, Juan LU9CYV
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Juan,
Did you do the factory reset?
73
Evan
AC9TU
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Juan, one possible solution for your volume control issue: please do a long press of the left small button to get to the menu. "Audio" will appear. Do a short press of the same button and "Volume step" will appear. If the step size shown is something very small like 0.25 dB , please change that to 2 dB by again short pressing the left small button, then rotate the right encoder to get to 2 dB, then press the right small button 3 times to get back to the operating screen. Now it takes less rotations of the volume encoder to increase volume.
Also, and before doing the above, if you just updated the firmware, it is sometimes necessary to do a factory reset to clean out anything left in the EEPROM. Did you do that??
Good luck .. Ron
On Tue, Jan 2, 2024 at 4:09?PM Juan < lu9cyv@...> wrote: I was able to update the firmware to the latest version, but the volume control still does not work
73, Juan LU9CYV
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I was able to update the firmware to the latest version, but the volume control still does not work
73, Juan LU9CYV
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Re: QMX: Selecting RX bands - as it stopped receiving on 20m and 30m bands
Bela,
The Y0 to Y3 is the base two numbers of the Band_0 and Band_1 input.
Band_0? Band_1? BPF Selected
0? ? ? ? ? ? ?0? ? ? ? ? ? 0 - Y0 connected to W
1? ? ? ? ? ? ?0? ? ? ? ? ? 1 - Y1 connected to W
0? ? ? ? ? ? ?1? ? ? ? ? ? 2 - Y2 connected to W
1? ? ? ? ? ? ?1? ? ? ? ? ? 3 - Y3 connected to W
Note that BPF 0 is the highest frequency band, and BPF 3 is the lowest frequency band for the build.? This is selected using the Band Configuration screen.
73
Evan
AC9TU
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Yes, The QMX can not get power from the USB cable.? It needs a separate power supply.? This is best done for the first time with a current and voltage controlled supply, starting at 6.5 to 7 volts, limited 250ma.? A power cycle is needed whenever the USB cable is disconnected from the PC.? The QMX does not always let the PC know how to connect.
73
Evan
AC9TU
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Juan,? That's not a stupid question at all. QMX receives no power from the USB port, so unlike a thumb drive for example, it definitely requires a power supply to connect to the computer.
JZ KJ4A?
On Tue, Jan 2, 2024, 1:59?PM Juan < lu9cyv@...> wrote: A stupid question....
Does the QMX have to be connected to power for the computer to recognize it?
73, Juan LU9CYV
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A stupid question....
Does the QMX have to be connected to power for the computer to recognize it?
73, Juan LU9CYV
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Re: QMX access to terminal applications
Thank you very much Evan for you response.
73, Juan LU9CYV
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Todd W2TEF
Paul - AI7JR
Juan
Ronald Taylor