Starting from a non-SSB version, I just installed 1_02_000 on my QMX and ran the SSB Calibration process directly from the QMX (no PC).?
The display shows "10m L SYNC, Optimum 46", and has FROZEN there.? I do not know what to do next.? Please advise.
I watched one recent video on this calibration process, but they didn't get stuck here.
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73s,
Glen, WB4KTF, Austin, TX
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Jerry, could you use a microcontroller to speak CAT to the QMX and read the band info that way?
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I have the dummyload from QRP Labs, which has a + and - for measuring, but I still get 0.0 volts. (checked AC and DC, just in case...)
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Re: New QMX+ Calibration victim
Update:
Visual inspection showed that Q108 was broken as it had its case cracked. Cannibalized another unbuilt QMX+ board and replaced it. Measured and found D108 shorted and replaced it as well. Now with PSU set to 7.5v and current protection set to 350mA I dared to test to start the QMX again. Now it starts up but it¡¯s quickly visible that some voltages are not right as the contrast is way to high on the LCD. So I quickly unplugged the power. (For a brief part of a second the display shows the startup information correctly before turning black probably as the 5v? rises to too high. Maybe the SMPS regulation isn¡¯t working)
Open and greatful for further ideas on how to continue troubleshooting ?
Jonas - SM4VEY
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Nice picture of a great day! ?I really enjoy people¡¯s adventures with QRP radio. ?
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Trevor (N0YMA)
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So you might have a problem in the power sensing area (T507 I think).
Do you have a dummy load, or any other way of measuring output externally?
Roger
Get BlueMail for Android
Uhm... No! I completely missed that jumper.
I added that jumper and power still reads 0.0 on Diagnostics screen when pressing "T". I did confirm again, that when testing power, the power transistors are all warming up, so they are doing something.?
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Based on 27MHz I¡¯m assuming you are using a crystal reference synthesiser rather than the TCXO
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its possible the crystal or 5351 is failing but try setting the frequency back to nominal and see if it transmits on frequency OK and cleanly ?
?
Also try another GPS antenna if you have one and see if the GPS attribute ?display looks good?
?
Beyond that the cheapest fix that also an upgrade is a new synthesiser board with TCXO option as an easy-build ?plug in swap ?(just needs the freq changed to 25MHz in the Ref freq menu?
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Can anyone kindly inform about the M3 black screws used in the QMX+ case ? what'is lenght ? 6 mm 8 mm ?
This afternoon after assembly and performed all tests i was presented with 8 black screws that dit not fit, they are M2.5.
In the assembly manual is stated they are M3 but no info about lenght.
Ahh, by the way the QMX+ worked first power on but with a garbled screen.
Had to disassembly the front panel and retouch the LCD pins. Its a big PITA to properly solder them by the manual.
Now everything is ok.
Greetings
//Eduardo
?
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Uhm... No! I completely missed that jumper.
I added that jumper and power still reads 0.0 on Diagnostics screen when pressing "T". I did confirm again, that when testing power, the power transistors are all warming up, so they are doing something.?
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Did you install the jumper behind the BNC (JP501 I think)?
Roger?
8P6RX
On 08/05/2025 13:36, Ahand59 via
groups.io wrote:
toggle quoted message
Show quoted text
I have corrected all the issues with my enameled torroid
soldering joints, so those look reasonable now on all bands.
That said, I have no power whatsoever when pressing "T" on the
diagnostics screen.? I am using 3 cell LIPOs charged to 11.9vdc
(checked after charging with multimeter) for power. T501 wound
for 12v.??
- Initial startup was at 7v, just to be safe. No issues or magic
smoke so slowly raised voltage to 12V with no issues. No pops or
anything else.?
- Checked T507 by removing and testing, then reinstalling.
- Removed and rewound T501, RWTST, to eliminate concerns of over
twisting the wires.?
- Rewound T401 and checked for continuity on the 3 pairs, then
installed it.?
- T502 has continuity and the correct amount of wraps.?
- The dummyload I am using is one I purchased along with the
kit. Assembly was enjoyable and it measures 49.5 ohms.?
When I press "T" I get 0.0 power. I checked the SWR protection
set it higher, and restarted the radio, but still get 0.0 on the
diagnostics screen. I then turned the SWR protection completely,
then restarted the radio and still 0.0. The power transistors DO
get slightly warm, but not suddenly. From what I can tell,
everything is as it should be, but I'm still getting no power to
the dummyload. I have no actual antennas yet, but should have
one completed in a couple hours.?
I checked several patch cords (between radio and dummyload) and
they all are working correctly, but still no power.
?
What should I be checking now? Is there a test procedure for
this specific issue? There has to be others who have encountered
this before...
Thanks again, btw...
Ahand59?
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Re: Release of version 1.2 of ABS solution for QMX+ (Automatic internal antenna tuner, internal battery and internal speaker with audio amp)
#ABS
#ATU
#PSU
#QMXplus
Please add my name to your next group buy venture for one QMX+ solution.?
William Strand AG5ZN
wrstrand@...
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QRPLabs 50W Amplifier - 20V Power Supply Solution
Just wanted to share my 20V power supply solution that I made that works well for me.
The upfront cost was $138 + tax, which includes a charger and a 96Wh portable Li-ion battery.
?
Key features:
?
? Air travel approved (under 100WAh)
? Shock protected
? Uses 18650 Samsung cells
? Easy to charge
? Built-in charge display
? More compact than LiFePO?
? Weighs only 680g
? Dual purpose if you have other HF power tools.
? Comes with a 3-year warranty!
?
?
A few photos:
?
A shopping list:
?
?
?
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I have corrected all the issues with my enameled torroid soldering joints, so those look reasonable now on all bands. That said, I have no power whatsoever when pressing "T" on the diagnostics screen.? I am using 3 cell LIPOs charged to 11.9vdc (checked after charging with multimeter) for power. T501 wound for 12v.??
- Initial startup was at 7v, just to be safe. No issues or magic smoke so slowly raised voltage to 12V with no issues. No pops or anything else.?
- Checked T507 by removing and testing, then reinstalling.
- Removed and rewound T501, RWTST, to eliminate concerns of over twisting the wires.?
- Rewound T401 and checked for continuity on the 3 pairs, then installed it.?
- T502 has continuity and the correct amount of wraps.?
- The dummyload I am using is one I purchased along with the kit. Assembly was enjoyable and it measures 49.5 ohms.?
When I press "T" I get 0.0 power. I checked the SWR protection set it higher, and restarted the radio, but still get 0.0 on the diagnostics screen. I then turned the SWR protection completely, then restarted the radio and still 0.0. The power transistors DO get slightly warm, but not suddenly. From what I can tell, everything is as it should be, but I'm still getting no power to the dummyload. I have no actual antennas yet, but should have one completed in a couple hours.?
I checked several patch cords (between radio and dummyload) and they all are working correctly, but still no power.
?
What should I be checking now? Is there a test procedure for this specific issue? There has to be others who have encountered this before...
Thanks again, btw...
Ahand59?
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Re: Mini Microphones for QMX SSB
Hi Eric - I would like one of your $15 assembled/tested mics in orange (or any available bright color) for my QMX. - How do you like your payment?
Sandy KB3EOF
7220 Burkittsville Rd
Middletown, MD 21769
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Re: QMX 9v Power Supply
#9v
For 9V I use these two items, a PD power bank and a 9V 5.5x2.1 trigger cable:
(the SH-CP09B model)
?
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
Hi Ken
Using SSB without calibration is perfectly acceptable, the audio is still good. Calibration just makes it even better.
73 Hans G0UPL
On Thu, May 8, 2025 at 04:50 PM, Daniel Conklin wrote:
Since factory resetting a couple of times and installing the latest SSB firmware, the noise has mostly disappeared from my QMX+. My QMX HB never had the problem. It appears to be solvable.
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73, Dan - W2DLC
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?Thanks Dan but I am reluctant to install the latest SSB firmware as it seems to be bring in other as yet unsolved problems (PAs failing during calibration). I also am not happy with problems that just ¡®go away¡¯ without explanation. The SSB firmware is not listed as tackling this issue. I will just be patient until someone finds the cause (and a cure hopefully).?
73 Ken G4apb?
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Re: QMX+: low RX sensitifity @ 6m / 22 dB noise floor / 1500 Hz wistle
On Thu, May 8, 2025 at 04:50 PM, Daniel Conklin wrote:
Since factory resetting a couple of times and installing the latest SSB firmware, the noise has mostly disappeared from my QMX+. My QMX HB never had the problem. It appears to be solvable.
--
73, Dan - W2DLC
?
?Thanks Dan but I am reluctant to install the latest SSB firmware as it seems to be bring in other as yet unsolved problems (PAs failing during calibration). I also am not happy with problems that just ¡®go away¡¯ without explanation. The SSB firmware is not listed as tackling this issue. I will just be patient until someone finds the cause (and a cure hopefully).?
73 Ken G4apb?
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Re: How to use ProgRock2 in an oscillator?
Hi Steve,
If you look in the Kenwood Hybrids, Kenwood TS-940, or Icom Classic fora, you may find where I've posted circuits for replacing a reference oscillator with a TCXO.? You can use the ProgRock2 instead of the TCXO.? Another approach is to couple the ProgRock2's output into the crystal oscillator's base, gate, or grid, causing it to lock to the ProgRock2's frequency.? Just a few pF capacitance is usually enough.? With the ProgRock2 unpowered, adjust the crystal oscillator's trimmer so that it's close to the ProgRock2's output frequency.? When you turn the ProgRock2 on, it should lock to it.? This should eliminate the concern about the waveform.? But usually the circuit you're feeding from the crystal oscillator will filter out the harmonics.? Can you be more specific about the Colpitts oscillator you're working with?
Cheers
Halden VE7UTS
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Re: QCX+ latest firmware hex file link
Thanks Stan. For some reason my PC browser doesn't let me in to the files page but the direct URL you quoted works.
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It has been a while since I've used my Ultimate 3S for WSPR and it has worked flawlessly in the past. However now, no signal seems to be transmitting and the oscillator calibration with GPS keeps increasing the frequency constantly. It is now up to 27,011,491 and climbing. This can't be right. Any ideas of what the problem may be??
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Glen Jenkins WB4KTF
UPNORTHOF48 :
Bruce Akhurst
Bill AG5ZN
Igor