I am that user.
I think I've got it.? I changed the delimiter to '.' instead of
',' When I did this the additional '.' appeared in the IF;
Response.
Log file from QMX attached.
Chris, G5CTH
On 22/08/2023 14:45, Mike Black via
groups.io wrote:
toggle quoted message
Show quoted text
Have a user that's filed a bug report on QMX
firmware 1_09
There's a period in the response which seems to
be wrong and moves the rest of the data 1-byte so '2' which is
the mode is being recognized as the FR/FT result indicating
MEM VFO.
[2023-08-21
06:22:14.669869][00:00:57.226629][RIGCTRL:trace]
read_string_generic(): RX 39 characters, direct=1
[2023-08-21
06:22:14.669869][00:00:57.226636][RIGCTRL:trace] 0000 49 46 30
30 30 30 37 30 37 34 30 30 30 20 20 20 IF00007074000
[2023-08-21
06:22:14.669869][00:00:57.226641][RIGCTRL:trace] 0010 20 20 2b
30 2e 30 30 30 30 30 30 30 30 30 32 30 +0.00000000020
[2023-08-21
06:22:14.669869][00:00:57.226683][RIGCTRL:trace] 0020 30 30 30
30 30 20 3b 00000 ;
[2023-08-21
06:22:14.669869][00:00:57.226689][RIGCTRL:trace]
kenwood_transaction: read_string len=39 'IF00007074000
+0.0000000002000000 ;'
Mike W9MDB
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Re: Audio level limiting with diodes?
Clipping does sound bad. A better way would be to use one of QRPLabs' AGC modules. It doesn't clip. It lowers the resistance of the volume pot wiper-to-ground connection in response to loud signals and works very well for a simple audio AGC.
73 .. .Ron
I recall at one point folks in the Bitx20 boards were discussing a simple hack to avoid blowing out eardrums on transceivers lacking AGC - They would simply use a couple diodes between the headphone lines to ground, so higher voltages would get bled off through the diode.? I don't recall the precise details, but the principle seems like it might work.
Obviously it is a kludge and probably sounds terrible when it gets to audio limiting, but it might at least prevent you from getting blasted off your chair by a sudden loud CW signal...
Thoughts?
-N1EDC
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Re: QCX mini no power output
Hi Arlen. what is the current draw on transmit? If Q^ is heating up fast then it's probably?conducting into a short. If Q1 is really hot, it could be the short. You could try replacing that one BS-170 and see if it fixes it.?
The receiver should mute during transmit and only be active in receive mode. Please verify that is the case. It wasn't clear in your note. In receive mode with antenna connected are you hearing signals? If not, the sudden disappearance of power output could be related to an intermittent ?soldering issue on the toroids in the lowpass filter section, which would also potentially damage the final transistors. You should check the continuity?through?the lowpass filter before transmitting again.?
Good luck ... Ron
On Tue, Aug 22, 2023 at 1:42?PM Arlen Levin < wa6auf@...> wrote: Thanks for the suggestion, but looks like I have other issues. I took the unit out of the case and powered it up. Noticed that Q1 and Q6 got hot pretty fast. With a 12v power supply, I am drawing about 150 ma without the display and control boards attached. I guess that is a little high. Don't see any solder bridges or anything else abnormal. Anyone have any ideas where to look?
Arlen WA6AUF
A stab in the dark-- Try reheating the connections to the low
pass filter to burn off any remaining enamel.
The intermittent operation suggests that something (maybe
temperature) is activating a flaky connection.
Good Luck!
73, Paul -- AI7JR
On 8/21/23 09:40, Arlen Levin wrote:
I recently completed assembly of a QCX mini 30m version. It worked
on first power up, although the power output was a little low.
I took it on a camping trip a week or 2 later and on first
attempt, there was no power output. I tried again a few hours
later and it was working again.
The next day, same issue, no power output and was not able to get
any power output since.
When keying, I hear the side tone and also receive seems to be
active. I don't remember if this was the case or receive gets
muted on transmit.
So, my question is, do I have a problem with transmit/receive
switching or power output and anything else to check before
removing from case?
I did try a factory reset.
Tnx,
Arlen Levin
WA6AUF
|
Re: QDX Fault debugging (help)
?The available space is kind of tight on the QDX, is there any recommended place for the 47V Zener Diode?
73 de Pedro, LU7DZ
|
Sounds like it's missing the ground connection on the 12V. Check the socket soldering and continuity with the board.
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On Aug 22, 2023, at 16:07, Bruce KS4V < Ks4v@...> wrote:
I am helping a friend troubleshoot a QMX wired for 12 volts.? The rig will not power up unless the USB c cable is attached.? Remove the USB cable and the rig will not power up.? Thinking about reflowing the pins for the USB connector but does anyone have a better suggestion?
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I am helping a friend troubleshoot a QMX wired for 12 volts.? The rig will not power up unless the USB c cable is attached.? Remove the USB cable and the rig will not power up.? Thinking about reflowing the pins for the USB connector but does anyone have a better suggestion?
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Re: QDX rev 5 Troubleshooting
Hi Chris
John is right. Luckily there are two other working LPF circuit blocks do use for reference. In answer to other question Q5 is probably OK and L9 would not be open if DC switching properly.
Must be certain DC is OK before worrying about RF. If it were me I’d remove L9 choke again and verify that DC is then failing - excludes a solder bridge bypassing the choke. Or measure RF on both sides of choke - should be a reasonable differential.
Make sure the input diode has been tested or replaced. May be open on forward bias.
Assuming RF is getting into the LPF and choking is good at L9, RF must be being either shunted or attenuated in the LPF.
Measuring RF at centre of LPF compared to input and output may be clue.
Remove and inspect and/or maybe jumper the toroids to see effect on RF levels? ?Using low power supply and dummy load should be not much risk to finals.
-Nick
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Re: QCX mini no power output
Thanks for the suggestion, but looks like I have other issues. I took the unit out of the case and powered it up. Noticed that Q1 and Q6 got hot pretty fast. With a 12v power supply, I am drawing about 150 ma without the display and control boards attached. I guess that is a little high. Don't see any solder bridges or anything else abnormal. Anyone have any ideas where to look?
Arlen WA6AUF
A stab in the dark-- Try reheating the connections to the low
pass filter to burn off any remaining enamel.
The intermittent operation suggests that something (maybe
temperature) is activating a flaky connection.
Good Luck!
73, Paul -- AI7JR
On 8/21/23 09:40, Arlen Levin wrote:
I recently completed assembly of a QCX mini 30m version. It worked
on first power up, although the power output was a little low.
I took it on a camping trip a week or 2 later and on first
attempt, there was no power output. I tried again a few hours
later and it was working again.
The next day, same issue, no power output and was not able to get
any power output since.
When keying, I hear the side tone and also receive seems to be
active. I don't remember if this was the case or receive gets
muted on transmit.
So, my question is, do I have a problem with transmit/receive
switching or power output and anything else to check before
removing from case?
I did try a factory reset.
Tnx,
Arlen Levin
WA6AUF
|
Hello Phil
Thanks very much for those kind words. I have built many of the kits in the past, not all without a hitch!
I too hope I can announce it is working, alas I fear this one is not going to make it.
Not to be beaten I have ordered another kit so hopefully we will be on soon.
Good luck with the rest of your build and hope to maybe work you QMX - QMX.
The help and assistance from the folks on this group are invaluable.
All the best
73
Ian
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----- Original Message ----- From: PHILIP GRAITCER via groups.io <pgraitc@...> Reply-To: < [email protected]> To: < [email protected]> Sent: 22/08/2023 21:01:42 Subject: Re: [QRPLabs] No QMX Flash Drive. ________________________________________________________________________________ I’ve been following this thread, and although I can’t add any ideas to try, I just wanted to let Ian know that I am rooting for him, and I really hope that this problem gets solved.
Your perservence and the groups’ postivie comments are inspiring.
I can’t wait until I see that email saying “It worked!”
Phil, K3UT
(midway through construction of my own QMX)
|
I’ve been following this thread, and although I can’t add any ideas to try, I just wanted to let Ian know that I am rooting for him, and I really hope that this problem gets solved.
Your perservence and the groups’ postivie comments are inspiring.
I can’t wait until I see that email saying “It worked!”
Phil, K3UT
(midway through construction of my own QMX)
|
QMX Q103/Q104 short fixed
I received my QMX kit yesterday. One of the first things I did was check for the Q103/Q104 short. My kit DID have the short. I heated the AOD403 component with a small crafting heat gun and nozzle to direct the heat only where I wanted it. When the solder started to melt, I moved the part about 1mm as suggested by Hans. NO more short! Yea!
Thanks to all on this list for your help and suggestions. Now I can get on with the build! Keep those good ideas coming!
Keith N8CEP
USA
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Re: QDX rev 5 Troubleshooting
Chris ,
I took another look at your voltage readings.
The 5.13 volts PIN reverse bias voltage looks very low! It should be higher than that in receive mode, and much higher in transmit mode as the TX RF derived boost kicks in. Check over the voltage doubling bias circuit very carefully.
What PIN? reverse bias voltage do you see in RX mode? It should be close to your power supply voltage .inus a diode drop.
JZ KJ4A?
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Re: 20m+WSPR+Loop Ant+TX without computer
Here is my take on standalone wspr tx without gps.?
I am using NTP server via wifi connection for time.
73
Barb WB2CBA
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You can use a browser to view <time.is> which will give you a very accurate time. ?Even if you have to manually input the time to your rig, you would likely be close enough to the correct time to make QSOs.
73 de Ray K2ULR
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Re: Audio level limiting with diodes?
It would be similar to this technique to protect ADC inputs with a couple Schottky diodes:
https://www.analog.com/en/technical-articles/protecting-adc-inputs.html
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Re: 20m+WSPR+Loop Ant+TX without computer
FYI? I use my cell phone and have no issues!
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On Aug 22, 2023, at 1:16 PM, Mustafa Umut Sarac <mustafaumutsarac@...> wrote:
? Hello Bruce and all, I think I will spend my last dime on transmitter and antenna and would not afford GPS. Is there any online clock which will transmit the GPS timing free . And I would not want to report to everyone my exact location worldwide. Does 5 watts power wspr 20 mt transmission with my close range loop antenna affect my health ANYWAY ?
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Re: 20m+WSPR+Loop Ant+TX without computer
Hello Bruce and all, I think I will spend my last dime on transmitter and antenna and would not afford GPS. Is there any online clock which will transmit the GPS timing free . And I would not want to report to everyone my exact location worldwide. Does 5 watts power wspr 20 mt transmission with my close range loop antenna affect my health ANYWAY ?
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Re: 20m+WSPR+Loop Ant+TX without computer
Hi Mustafa
Maybe look at the U3S. That is transmit-only, and with the addition of the QLG2, bullet-proof.
Roger
8P6RX
Get
Hello there , I am optimizing everything for my condition. I looked at WSPR sites and found most contacts are for 20 meters band. I will build a 20 meters loop antenna for in room use or on balcony use. My computer is not functioning correctly and I will not plug the transmitter into the computer. I will not receive?and I will not report. I learned that WSPR transmission depends on correct timing , does the QRPLABS?transmitter have a clock which I will be able to correct manually . I will TX a few extremely?short times a day.
Best Regards,
Mustafa Umut Sarac Istanbul
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Re: 20m+WSPR+Loop Ant+TX without computer
I have a QCX +5W and it runs WSPR 24/7
You can set the clock manually after start up and you can afford to gain or lose a second before reception of your signal is a problem. ?Timing is controlled IIRC by the system clock crystal which is low cost and although you can adjust it manually via the menus it will still drift as temperature changes?
if there is a power interruption in WSPR mode it will restart with the clock wrong?
By far a more superior solution is to buy and connect the optional GPS board which will trim the TX frequency every time, calculate your Location code and update the clock between transmissions .
after an unexpected power loss the WSPR transmission will restart and after running wrongly timed once the frequency, timing and location will all be checked/updated?
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20m+WSPR+Loop Ant+TX without computer
Hello there , I am optimizing everything for my condition. I looked at WSPR sites and found most contacts are for 20 meters band. I will build a 20 meters loop antenna for in room use or on balcony use. My computer is not functioning correctly and I will not plug the transmitter into the computer. I will not receive?and I will not report. I learned that WSPR transmission depends on correct timing , does the QRPLABS?transmitter have a clock which I will be able to correct manually . I will TX a few extremely?short times a day.
Best Regards,
Mustafa Umut Sarac Istanbul
|
Ronald Taylor
Dr. Pedro E. Colla (LU7DZ)
Bruce KS4V
Barb WB2CBA
Bruce Akhurst