Re: QMX+ Power Output Question
I have a factory built unit and your output looks good to me. Very similar. ?Those that tinker trying to get a little bit more out of theirs write up their sad stories here and ask for help. Don’t worry. Be happy.
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On Apr 1, 2025, at 3:40?PM, secondchancesailor via groups.io <jagillaspie@...> wrote:
? I finished my QMX+ kit 2 weeks ago.? I built it for 9V, and held my breath as I powered it up for the first time.? ?Everything seems to work fine, and all bands receive and transmit.? I called CQ a few times on CW and saw typical results on the reverse beacon network.? ?I have also worked some FT8 on various bands.? ?So overall, I feel like it is a successful build.? ?That being said, I do have a question about the power output.? ?Running into a dummy load, I get the output as listed below.? ?Are these figures typical on the higher bands, and if not is there anything I can do to help increase the output to where it should be?
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73, Jim (w8ykg)
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160M? 5 Watts
80M ? ?5 Watts
60M ? ?5 Watts
40M ? ?4 Watts
30M ? ?4 Watts
20M ? ?3.5 Watts
17M ? ?3 Watts
15M ? ?3 Watts
12M ? ?3 Watts
10M ? ?2 Watts
6M? ? ? 1 Watt
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?I am powering with a 7v power supply.
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Perhaps that's not enough ... I found that my QMX+ won't really run below about 7.5 VDC.? Below
that, it flashes the "flashing battery" icon.
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Good luck!
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- Bruce K1FFX
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Have you heard about Jeff Moore? He can help.
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On Apr 1, 2025, at 7:22?PM, Bill KJ5IVB via groups.io <Wdbuck@...> wrote:
? Just finished QMX build and I can’t get my Mac to recognize the USB so as to upload firmware. ?I am powering with a 7v power supply. ?I am using USB c to usbA and then an adapter. ?Have tried two other cables with no success. ? I have seen all the tips on YouTube and also page 63 in the manual. ?Feel like I’ve wasted $150 on this radio and likely never to get it to work. ?I will try on a Windows machine if I can borrow one this week. ?Other than that don’t know what to do. ?
Bill, KJ5IVB?
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Gary W0CKI
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Re: Firmware nightmare — gibberish (!) help needed
Unfortunately for me, copy-pasting the file (instead of drag-dropping) made no difference. Still back to gibberish screens. :(
Randy K7RAN
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Re: Firmware nightmare — gibberish (!) help needed
Aha, Roger, thank you. I dragged-and-dropped. Using the Terminal app to get back to it, I'll try copy-pasting the file instead. I didn't attempt to delete the old firmware. Will report back.
Randy K7RAN
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Re: Firmware nightmare — gibberish (!) help needed
How are you copying the firmware?? Drag and drop has been problematic for some people.? Copying/cutting the source file and pasting to the destination is recommended.? Also, do not attempt to delete the old firmware from the QMX drive.
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I'm wondering if the "EEPROM.???" file I see there became corrupted (???) ...
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Re: Firmware nightmare — gibberish (!) help needed
I'm wondering if the "EEPROM.???" file I see there became corrupted (???) ...
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Re: Firmware nightmare — gibberish (!) help needed
Update... still no solution... but I was able to use the Terminal to enter the QMX's Terminal apps... I tried a factory reset, but it still booted into gibberish... So I then rebooted into the Terminal apps, and I selected the firmware function, and loaded "1_00_027.QMX"... but it rebooted into gibberish yet again. I tried that a few times, hoping that doing the same thing repeatedly would merit a different outcome, hi hi. No dice.
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Any help would be appreciated!
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73, Randy K7RAN
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Just finished QMX build and I can’t get my Mac to recognize the USB so as to upload firmware. ?I am powering with a 7v power supply. ?I am using USB c to usbA and then an adapter. ?Have tried two other cables with no success. ? I have seen all the tips on YouTube and also page 63 in the manual. ?Feel like I’ve wasted $150 on this radio and likely never to get it to work. ?I will try on a Windows machine if I can borrow one this week. ?Other than that don’t know what to do. ?
Bill, KJ5IVB?
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Firmware nightmare — gibberish (!) help needed
I attempted to update the firmware using my MacBook Pro. I followed the manual as follows:
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- I navigated to the firmware menu choice and clicked "TUNE"
- Then I used a USB-C cable to connect to my Mac, and the drive appeared on my desktop no problem
- Then I copied the new file (yes, unzipped, named "1_01_003.QMX") to the drive
- It copied over no problem; and then it rebooted into screens that look like the screenshots below
I have a second QMX, but I'm too spooked to try it with that one now!
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Has anyone ever seen this before? Is there a way out? I'd rather not have to open the radio (I bought it assembled). Help! :)
73, Randy K7RAN
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Re: LIVE: SOTA+ is trying to do SSB on 10 GHz with a QMX
I was really hoping for coverage on the prototype? QMX+/- that uses SSB into a DSP with AI? to generate CW from the spoken word and decode? CW back to the spoken word.? Currently it? only understands? the Meskhetian Turkish dialect due to compatibility problems training the AI to phome interface.? Due to the limited memory and processing capabilities this had to be written in machine language and is not likely to be ported to the universal babelfish protocol any time soon.? It may be another year before we can even hope for an update.
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Re: QMX+ Power Output Question
Thanks Jeff, I'll do that next chance I get!
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QMX+ Rev3 and Rev1 interchangeability
I have ordered another QMX+ kit.? I assume it will be Rev3.? I have a Rev 1 front panel board already constructed.? Can I use this Rev1 front panel board on a Rev3 main board?
Greg, ZL4GW
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Re: QMX+ Power Output Question
That looks pretty good except for the higher bands. ?Verify the number of turns on lpf4 & lpf5. ?Also start with the turns evenly spaced around each toroid. ?The upper bands are very sensitive to that.
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good luck.
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73
Jeff Moore
W1NC
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Re: Windows WSJT-X audio input level adjustment
Yes found this to be useful. I adjusted all bands up by 10 dB. The settings were 54 and now 64. Just getting into the green zone on 6 metres and less than 40dB showing on the noisier bands.
de VK6XT?
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Re: QMX+ rev 3 freezes shortly after boot
Did you use The Talentcell for 9 V and 12 volts??
Possibly flaky BMS??
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Re: I would like to purchase an assembled (working) 10 watt linear hf amplifier
What will you be driving it with?? ?Max input 50Milliwatts!
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Allison
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Post online only,?
direct email will go to a bit bucket.
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Re: I would like to purchase an assembled (working) 10 watt linear hf amplifier
You’ll have to figure out TX RX switching too
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Re: Tone or birdie every 500 Hz in USB mode
In my case, the CW-like stuff was coming from the GPS module. I remove the module and the CW stuff goes away.
Tony
AD0VC
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That pulsing signal like CW is what I get too, so I don't think it's external. It doesn't change with tuning, so it seems like something getting injected into the audio.
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73, Dan - W2DLC
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Re: Tone or birdie every 500 Hz in USB mode
If I disconnect the antenna, the birdies appear in the FT8 waterfall. When I connect the antenna, they disappear, presumably because the atmospheric noise swamps them. Maybe the AGC is a factor as well. I have a 1 meter loop and an active whip. The loop has
much lower output on 10 meters. On 10 meters I see birdies with the loop but not with the whip. I am talking about the 500hz spaced birdies on FT8.
I find it interesting also that Hans mentioned 500hz birdies coming from the ADC built into the microprocessor. They affected his microphone for SSB. I can't make a connection between that and the RX birdies but it keeps rolling around in the back of my mind.
Tony
AD0VC
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I think it can be corrected with filters or settings somehow. When I change to DIGI mode on the QMX, a lot of these noises disappear. In the image below, the bottom portion was DIGI, the top portion USB on the QMX+ (Pressed the Mode button just as green
line appeared to change to USB RX)
Whatever filtering or settings are different between USB and DIGI, the RX looks a LOT better in DIGI. Notice the lines at 750, 1250, 1750, 2250, 2750 are non-existent in DIGI. The lines at 500,1000,1500,2000,2500,3000 appear unchanged by this, but there
is definately something different between RX in DIGI and USB.
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In this picture, I cycle back through USB to LSB. The bottom half is USB, the top is LSB.
Notice that when I switch between USB and LSB the tone or noise at 1500 and 3k both become more pronounced (stronger signal indicated by line turning red instead of yellow) Also the lines at 500 and 250 get stronger (solid yellow instead of broken yellow).
Earlier today the LSB side was showing a pulsing tone at 750 almost like carrier from CW, but not in any CW pattern.. I did not get a screen shot of that while it was happening, but I now suspect it may have been an external signal. Note that all these signals
I am highlighting are with the radio connected to a dummy load with a 36" piece of RG-8x
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David Wilcox K8WPE
Randy K7RAN
Tom Clifton
Bruce Akhurst