Re: New Build but can¡¯t get firmware to load
Thanks for that info. I actually have ordered some inductors so I¡¯ll wait for the replacement. In the mean time, I had already ordered 2 (accidentally) 15-60 units. I will only need one so I can use the PCB2 from the extra to get this one running so I can find what OTHER surprises await!!!?
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Not being critical, but ...
I remembered seeing a pretty clear warning, highlighted in red, about not drawing any appreciable current from the VDD OR VCC rails when interfacing through the dev board. It's on page 68 of the assembly manual.
Hopefully new SMPS board(s) will bring it back to life.?
Greg
On Tue, Sep 17, 2024 at 10:55 AM, me@... <me@...> wrote: Some details:
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Correction: Arduino on dev board was powered from Vcc (5V) on JP106.
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Firmware was 27.
Can not go to firmware update mode even with the jumper wire (Aux2 to ground).
When plugged to PC - no COM port to try putty. So, board exhibits a brain death.
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When 12V applied and PWR encoder is long pressed - voltage on JP106 from VCC and GND goes to 0.1V then gradually within few sec drops to 0V.
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Any help would be appreciated.
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73,
Sardar ( AC8L).
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Re: New Build but can¡¯t get firmware to load
And don't worry about trying to connect that lead under the edge of the coil form, which could be very difficult.? Depending on which side of the coil was disconnected (it's hard to tell from your photo), it can be connected to the top terminal of D107 or C106.? See the schematic and board drawings.?
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Re: QMX+ High Current and Self Start
On Tue, Sep 17, 2024 at 03:17 AM, Damon wrote:
V+ takes a couple of minutes to build up
You definitely have a bad or misplaced component in the Vin circuit.? The voltage should come up in milliseconds.?
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You likely back-fed 5V from the USB into the un-powered QMX 5V power supply, killing it.? Looking at the schematic, you may have fried Q108 or Q105.? I would check that area of the circuitry.
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Sardar, did you measure Vdd when pressing the PWR On command. If you did and it was not there either, you might try a new 5 volt power regulator board. It may have been damaged by the backfeed, although I can't see the reason that might?happen. But it does provide for the initial startup sequence of events by seeing the Power On command from the switch and supplying 12v to the linear regulator which then boots up the processor which sends PWM back to both regulator boards and shuts down the linear regulator. Just a thought ... Ron
Some details:
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Correction: Arduino on dev board was powered from Vcc (5V) on JP106.
?
Firmware was 27.
Can not go to firmware update mode even with the jumper wire (Aux2 to ground).
When plugged to PC - no COM port to try putty. So, board exhibits a brain death.
?
When 12V applied and PWR encoder is long pressed - voltage on JP106 from VCC and GND goes to 0.1V then gradually within few sec drops to 0V.
?
Any help would be appreciated.
?
--
73,
Sardar ( AC8L).
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Re: QMX+ test ADC I/Q shows one phase missing
I¡¯ve seen this before. ?It¡¯s difficult to diagnose without a scope. ?But if you have a multimeter you can check the dc bias. ?There should be about 2.5 volts dc on pins 1 & 7 of IC405 & IC406. ?Also check the soldering on the trifilar transformer and make sure it¡¯s installed correctly. ?Beyond that, a scope would be helpful.
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good luck.
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73
Jeff Moore
W1NC
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Some details:
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Correction: Arduino on dev board was powered from Vcc (5V) on JP106.
?
Firmware was 27.
Can not go to firmware update mode even with the jumper wire (Aux2 to ground).
When plugged to PC - no COM port to try putty. So, board exhibits a brain death.
?
When 12V applied and PWR encoder is long pressed - voltage on JP106 from VCC and GND goes to 0.1V then gradually within few sec drops to 0V.
?
Any help would be appreciated.
?
--
73,
Sardar ( AC8L).
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Re: QDX and QMX+ (soon at least) what is the max safe swr?
Donald>
I totally agree phase of the reflected power is critical for each of the harmonics, thus affecting how the two components from the LPF and SWR will add or subtract,? and affect the peak voltage across the BS-170.? I have probably 40 scope photos and a few hundred measurements showing this.? Ultimately I will publish much of this info.
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In the past I have stated that BS-170 failures are most likely from excessive D-S voltage.? My effort demonstrates this is the case for both some bands and steady SWR and very bad for ATUs during tuning.??
Anyone with a good scope and the ability to make dummy loads of various impedances can replicate this.?
Can you do similar test?
(FYI I have the same digital scope as Hans).
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Currently I'm in the middle of determining BS170 power dissipation -? a little more difficult? since it require differencing various power dissipations.? So far I have used two approaches and now looking at a third approach to see if I can get more consistent results.
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(In the past I have been responsible for many failure analyses for NASA and the Military so I may be a little anal for Ham applications)
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Re: QMX+ High Current and Self Start
On Tue, Sep 17, 2024 at 12:17 PM, Damon wrote:
V+ takes a couple of minutes to build up from Vin upon first application of input power.
Sorry, what do you mean by "V+"?
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Re: New Build but can¡¯t get firmware to load
Don't worry if you need to unwind a turn or two to make slack.? The circuit will still work fine?
73, Don N2VGU?
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Re: QMX+ High Current and Self Start
Observation:
V+ takes a couple of minutes to build up from Vin upon first application of input power. Once 5.15V is reached at V+, push button power on is possible.?
If the radio is powered down, a 6.5mA draw is maintained. ?Pressing the push button will not power up again until Vin is reset by removing power and the jack terminals shorted then waiting for V+ to rise above 5.15V again.?
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Re: New Build but can¡¯t get firmware to load
On Tue, Sep 17, 2024 at 03:44 AM, <N4uav@...> wrote:
while using the jewelers loop, I found this. Mr. Ludwig, could this cause the overload condition?
Oh, indeed (and not). So its not an overload but an open connection. The result looks similar, Duty cycle is reaching Duty max and a low Voltage or 0 V is produced by the SMPS. One thing is weird. You have ADC_3V3 with some voltage. With a broken L102 I would expect 0V. So it looked to me more like an overload.
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A while ago someone reported about the same broken L. He told it was broken by fastening the nut.
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73 Ludwig
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QMX+ built, tested, and on the air as of 9/17/2024
I completed my QMX+ build this AM as soon as UPS delivered my Mouser order and I put that last 1N4007 in.? I had dropped one and of course it was never to be seen again, and I had no 4007's, and suitable replacements on hand had leads a tad to large.
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Powered up initially @7V and rambled through the menus prior to setting it to receive for a half hour or so and listened around the bands.? Eventually brought the power up to 9V (which is how I built it) and made a couple of contacts on 20m and 40m.? Great.
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Set to getting it to talk to N1MM+ and did the ICWC MST tonight QRP and made contacts on 20, 40, and 80m.
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Ran through the sweeps and such with PuTTy and all looks good.
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Power output per band with idle supply voltage at 9.1V
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6 - 2.2W
10 - 2.4W
12 - 2.3W
15 - 3.4W
17 - 2.1W
30 - 3.0W
30 - 4.1W
40 - 3.7W
60 - 4.8W
80 - 4.8W
160 -? 5.4W
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The only thing I stressed to myself throughout was to take time.? Winding the toroids and getting them to "land" was at best testy.? Being slow and methodical kept the potential errors at bay.
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Overall I'm quite pleased.? There are some buggy issues with locking up while coming out of certain menus, but those will get documented another day.? I have yet to wrap my head around the filter stacking as well, but again....for another day.
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Thanks Hans for a fun build!
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Tom Lewis - N4TTU
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Re: #bug #qmx QMX SWR protection not working when QSK is enabled?
#bug
#qmx
Hello Adrian
I will investigate this, and see if I can reproduce it here; If I can reproduce it then it would indeed be a bug and I can fix it.?
On Mon, Sep 16, 2024 at 10:42 PM, @Ludwig_DH8WN wrote:
Adrian, I guess this is a problem. For the original design ADC_FWD should be around 2 V @ 5 W out. For your design it should have around 4 V. AFAIK the highest input voltage for an ADC input is a bit more than 3 V for right measurement. For your QMX ADC_FWD is above the limit. This may cause calculation errors for both the output and also the SWR.
The SWR value displayed by the QMX in the diagnostic screen seems to be consistent with my Daiwa SWR/power meter (probably because the measured voltages are equally off, so their ratio remains the same). But I think you're right about the ADC input voltage! Will change the windings as soon as I have a bit of time.
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> I understand "S" were shown and no sidetone (for SWR protection) but you had output at the same time. Is this right?
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Yes, that is correct. Sidetone was suppressed as soon as the "S" appeared, then I saw both needles on the swr/pwr meter still wigling (I accidentally left my tuner in bypass mode). As soon as I switched QSK from "Auto" to "None", SWR protection operated correctly, killing the output.
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Regards,
Adrian
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Hi,
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I was experimenting with a dev board and Arduino Nano on it powered through QMX+ Vdd. Everything was going on fabulously until I turned radio off while ardiono was plugged to PC through USB for programming. Radio turned off, then showed 5V and that was it. It does not come back anymore.
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Is there a chance I can revive the board or it is gone?
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73,
Sardar ( AC8L),
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Re: QMX PUTTY and a fault or two
Just open the devicemanager, without plugged in the qmx.
Check what serial ports there are.
Then plug in the qmx and you will hear a sound and in the serial ports should change something.
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nothing helps? then try a live linux distribution, very easy to use, and check dmesg after: boot=>login=>plugin qmx
maybe there's a shortcircuit(i had one, on a prebuild device), so usb will shutdown and no qmx-device will appear.
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Re: A ¡°pluggable¡± firmware architecture?
Hello Mike
I think it's a nice idea but I don't know how to accomplish that in practice. What you're talking about is kind of the old PC "DLL" concept. Native code that has to be in a relocatable library. Not just that but there then has to be some way to load it onto the Flash - which can't be done in any way I know of, certainly not with the current bootloader. There are a lot of obstacles to that and again, I think the idea might not be easily transferable?to a small microcontroller system. The BASIC runs in a Virtual Machine not natively on the CPU. So how you bridge that gap, and how you construct microcontroller DLL's and how you get those into the Flash, those would be a lot of complex problems to solve.?
Here's a related (potentially "bad", I don't think so) idea.
Will there be a way to build our own "native" functions that can be called from QPRLabs BASIC?
Specifically, could it be possible to write our own optimized functions in C or assembly for STM32 and "link" them with a BASIC program or register them from BASIC?
That would potentially enable us to add our custom signal processing blocks to your pipeline.
For example, if we have a noise suppression algorithm that we particularly like it might let us (with proper hooks provided by you) insert it into the audio pipeline.
If we screwed something up then, say, a firmware reset could remove the registered custom components, and restore to the default pipeline.
What do you think?
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73, Mike KK7ER
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Re: QMX+: The trifilar toroid torture test
I made the wire a bit longer than needed, maybe an inch so I had a bit to work with, then after identifying and aligning the pairs, inserted one pair of wires at a time, kind of "rolling" the toroid across the pairs of holes. Much easier than trying to get all 6 to line up at once.
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Greg N1TR?
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Re: New Build but can¡¯t get firmware to load
With that wire broken, you won't be getting your main 3.3V supply rail, so lots of things won't work.
One wire from that inductor should be soldered to the pad right below the notch in the inductor case, the other opposite in the similar location.
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Ronald Taylor
Donald S Brant Jr
Tom Lewis - N4TTU