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Re: QMX+ straight key connection issue
All,
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? ? ?I have the latest firmware and it's set to "tip".? The rig keys when the tip goes to ground, but only if the ring is also (and always) grounded.? If the ring is disconnected and floating, the rig won't key regardless what the tip does.?
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Why?? Build error, feature or bug?
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W2EB
Bill
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Flight of the Bumblebees Pictures, Etc.
Flight of the Bumblebees Pictures, Etc ? 120 FOBB Results are listed on 3930scores.com ??85 Bumblebees.?? 35 Home Stations. ? ?Congrats to K0TTW who is sitting at top of the Bumblebee List. ? Congrats to AB8CA who is sitting at top of the Home Station List. ? Check to see all FOBB results (It still open for entries if you are a procrastinator) ? Bumblebee Pictures are still being accepted with an email to ?fobb-pictures@...??? Be sure to include your call sign, name, and location so I can tag your photos properly. ? The 2024 Bumblebee Pictures that have been submitted can be found at ?? ? Next Sunday, 18AUG24, is the annual QRP Skeeter Hunt. 1700-2100 UTC.? Get you Skeeter Number now and participate.? See for information and rules. ? The first Monday of every month is the ARS Spartan Sprint. See information and rules at ?????? ? 72, Jody ¨C K3JZD? and? Phil - K4PQC Adventure Radio Society Trustees |
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Re: My #QMX died :-(
#qmx
It doesn't look so bad.
I connected VDD to my 3.3V Lab supply, 12V to my powerbank and USB.
The Serial console coes up. Not as usual into the menu, but directly into a diagnostic screen, where you can test the buttons.
All button presses are recognized.
Let's hope, that a new PCB2 module will do the rest. vy 73, Peter DL4PJ |
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I am still having trouble getting a consistent result after the update.
In Windows 11 with QMX+ and sometimes Windows rejects the USB altogether and sometimes it takes it but no audio, even when the QMX+ shows up in the audio window. I have not seen this in other firmware versions. Something, bug of some kind...... |
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Re: QMX+ Toasted L-518 Toroid -- Cause ?
¿ªÔÆÌåÓýAm I the only one that when I first saw that image, I thought now who used a Hot Dog to make a coil?Joe WB9SBD On 8/11/2024 1:27 PM, Hans Summers
wrote:
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Re: QMXAudio sweep levels., PCM1804 or not
va3rr - thanks for your picture. Mine on 60m is -26 compared to your -6, so I am assuming mine is "very low" but would like someone who understands the intricacies of it to say yes or no, as I suppose it is possible for -26 to still be ok. Maybe??
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Steve M7WGN. |
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Re: SOTA Batteries for QMX/QDX
Supporting 12 volt doesn't seem to be part of the USB-C PD spec though, so before looking at this as an option for a 12 volt QMX, it would be good to check what a particular power bank supports.
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From usb.org:
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Fixed voltage outputs:
? 5 V, 9 V, 15 V and 20 V depending on PDP ? Optional voltages may additionally be supported ?
Something I noticed by the way, is that leaving the trigger board plugged in (but not the radio) slowly drains the power bank's battery. Not sure if that is because of the power it consumes, or because it doesn't allow the power bank to turn off. Mine seems to drop about 10% per day when I forget to unplug the trigger board. |
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Re: QMX+ Boost Power Out on 20M?
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Re: QCX mini build for 15m - questions about LPF components
Hi Mark For T1, 3-3-3-20 will work fine.? L4 make it one turn less than 17m; so: 8 turns.? C30 leave off altogether.? Low Pass Filter capacitors and toroids windings should be the same as the 15m LPF kit manual says 73 Hans G0UPL On Sun, Aug 11, 2024, 20:25 Mark Ennamorato via <mark.ennamorato=[email protected]> wrote:
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Re: QMX+ Toasted L-518 Toroid -- Cause ?
Hi Bill Always remember: "if it ain't broke, don't fix it!". Ok I know yours actually IS broken but still the radio works fine... So leave it be. Note that the -0 material is permeability zero. It's the same as winding on air. It doesnt even have any magnetic properties to restore by glueing it back together, which would otherwise be the advice on a toroid with actual permeability. The only reason for having the toroid there at all is that you can't easily and repeatably and reliably wind such a nice toroid on air. It just provides a nice convenient shape so that when I say 25 turns it always comes out at approximately similar inductance every time.. 73 Hans G0UPL On Sun, Aug 11, 2024, 20:55 Bill Jobes via <jobes=[email protected]> wrote:
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Hello Bob
That isn't what normally happens and isn't what's supposed to happen. As soon as the new firmware finished copying in and installing, the bootloader is supposed to jump straight into the application, booting up QMX in the new firmware version. This is always what's happened for me.? I suspect the question is, how the bootloader knows that the firmware copy is finished. The problem is on the USB Mass Storage Class devices (which means, USB Flash drive, in this case) there is nothing that guarantees that the 512 byte disk sectors will be copied in ascending order of the file. Though any "normal" human writing PC software would have no reason to send things in strange orders. But I suspect there may be occasions when this doesn't happen. The bootloader is supposed to be able to cope with this by maintaining a "scoreboard" of which file sectors it expects to receive, and ricks off each sector as it gets it, so when it has filled the scoreboaed with ticks, if is supposed to know that the file copy is complete, then it can reboot into the QMX main application. But Windows (and probably Linux too) does caching of disk contents and all kinds of other things I don't understand. It might be sending some other sectors over the USB connection along with the file, and that could perhaps be confusing the scoreboarding, I don't know.? Generally the bootloader is extremely minimalist. It does USB Device stack, fake FAT16 file system, I2C comms (EEPROM) 256-bit encryption/decryption, and the Flash write. All in 16 KBytes of program memory so as to maximize Flash remaining for the QMX (of 512 KBytes total). Additionally there isn't Flash space to waste on keeping a complete copy of the new firmware file, nor RAM space for that either. So decryption and Flash write has to take place in real time as the file copies in from the PC. And all the while, the bootloader must remain as simple and easy and reliable as possible because there is absolutely zero opportunity to roll out firmware updates to the bootloader, it's fixed in place in those chips for all time.? So there's a lot going on in the bootloader, and perhaps it doesn't cater properly for every single possible thing a host PC can throw at it. We've already seen that Android tries to write files to a connected disk and this doesn't go well with QMX.? In the end if power down and power up is necessary in a few cases after firmware update, it's not a huge big issue.? 73 Hans G0UPL |
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Re: My #QMX died :-(
#qmx
On Sun, Aug 11, 2024 at 07:47 PM, Peter Jacobi wrote:
Do you think, it's safe to connect a LAB 3.3V supply to the mainboard?Peter, ?
someone reported in this forum a while ago he was doing so. Afaik QRP Labs is doing also this to check each main board including the USB connection.
I think with installed firmware you may come to a working controller and USB connection. Via terminal you may reach only Diagnostics. But I never checked this.
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73 Ludwig |
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Re: QMX+ Boost Power Out on 20M?
¿ªÔÆÌåÓýHello Greg
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I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was.
I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands.
73
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Ian G4GIR
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Hi Ludwig
Yes correct. That parameter is ignored in the diagnostics screen and PA voltage is always low during non-transmit, in the diagnostics screen (only). As I recall, I added the PA voltage to the Diagnostics screen early on when I created the diagnostics screen. In version 1_00_010 I made the PA voltage display all the time (TX as well as TX) and I set it up such that the PA voltage would always be low when not transmitting (pressing T key). I also coloured it red or green to indicate if it was high enough during transmit and low enough when zeroed (non transmit in Diagnostics screen).? I specifically did this because it provides a way to test that the PA modulator is working properly, which is otherwise not necessarily noticeable (except as key clicks to disturb QSOs on nearby frequencies! So this behavior of the diagnostics screen is completely intentional. 73 Hans G0UPL |
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QMX+ Toasted L-518 Toroid -- Cause ?
My QMX+, built for 12V version, has been performing well for some weeks.? I decided to tweak the LPF toroids to see if IO could boost power a bit.
Imagine my surprise when L-518, one of two toroids for 10 and 12 meters, felt like mush when I squeezed it.
Further exam revealed it had split in four places, as can be seen in the attached photo.
I'm asking for advice on what caused the damage, so I can avoid that behavior in the future. I'm presuming one of my 12V batteries was over-charged to 13.8v, or maybe an SWR adjustment using either a T-1 or a ZM-2 'searched' into a damaging SWR range.
Since the radio still seems to function as normal, should I bother to replace L-518?? Rather than risk hole or pad damage, I'd snip this one out, and install a new one wire-to-wire.
I'd appreciate your thoughts/advice.
- Bill? W3WJ
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Re: My #QMX died :-(
#qmx
Thanks Ludwig,
I followed your advice: 85kOhm to 100 kOhm?
=>shouldn't destroy the PCB2.
Do you think, it's safe to connect a LAB 3.3V supply to the mainboard? Will? the boot routine detect this fake supply and refuse to boot or will I be able to do further diagnostics? ?
Peter
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Willem VA2WLM
va3rr
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