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PTT selection in QMX+
2
Is it possible to choose the active grounded method for PTT via the Menu or is it necessary to utilize a terminal program. If so,I could use some help finding the correct menu item! Thanks.
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Hello, I ordered a fully assembled QMX in April, and got it about two weeks ago. It died while i was listening to it. I maybe have listened to it a half hour total or less. i was switching bands and got a real sharp noise from my speaker, and then the screen went blank. not sure what the problem is, but i have only listened with it, and haven't even transmitted yet as a dont do cw yet, and i was building a mic for ssb. I was hoping to try digital modes on sunday, but i was just about to tune in to see if i could hear the 10m FT8 band as its a nice and sunny day, and i haven't been able to even hear ft8 on 10m as of yet. but its been pretty stormy here when i have been able to look at it during the week. I have not open it up as i am not sure if Hans will want me to return it as is since it is so new, or if im stuck and have to repair myself. I really dont think this should have died after only about 20 minutes of just listening to it. i know things happen, but i would have just bought the kit. It did turn itself off a couple times randomly before this. TBH i thought this was just my battery turning off since the draw is so low on receive. but maybe there was a problem in the first place? I did measure a resistance a couple places, and battery terminal is fine, but the antenna to ground is less than a half ohm? also not sure how to contact hans for what to do, but i replied to the email sent and tried the "help ticket" but not sure i should message him here? thanks, Ted
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Updated Wiki Page: QMX QMX_p kernel failures
3
#wiki-notice
The wiki page QMX QMX_p kernel failures has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions
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Sounds like the U.S. penny might be going away. I was inspired by the touch feature of DL1CR's touch feature on his QMX Carrot. This is pretty easy to print without supports, but you do need a couple of pennies! https://www.thingiverse.com/thing:7049323
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When Elecraft introduced the KH1 a year ago, I was immediately enthusiastic about the concept. A small and lightweight shortwave radio with an integrated telescopic antenna. This means that, weighing less than 400g, it can be used in any suitable location on shortwave. So I wanted to build something myself. I immediately began my own experiments with telescopic antennas for 7-30 MHz. This confirmed that a counterweight is absolutely necessary. This wire, which is a quarter of the wavelength long, contributes significantly to the radiated energy. So the idea arose to forgo the telescopic antenna and experiment with end-fed wires twice the length. Of course, it makes sense to stretch the wire as high as possible. But I also got respectable reports with EFHW lying on the ground or in bushes. In this place the antenna may detunes itself, so a tuner is necessary, as well as the standard 1:64 transformer (Unun). The tried-and-tested resonance circuit (Fuchs Kreis) performs both tasks. Once the antenna issue was resolved, QRP Labs brought out the QMX. The ideal TRX for my projects, and now even capable of SSB. Now all that was missing was a suitable housing with an integrated battery and a speaker with an amplifier. Then a paddle for CW as a contactless touch key directly on the device. And the QMX Carrot was finished. But it wasn¡¯t that simple, because everything had to be as small and light as possible. It now weighs 340g and measures 15x8.5x3.0 cm. I¡¯m happy with that. 73 Chris https://youtu.be/0kksiWVOtnQ
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(Right: Gerald Youngblood, Flex Founder) They launched their new product "Aurora", 160-6m, 500W transceiver that uses polar modulation just like QMX Hans: "So they visited me to admire QMX and I visited them to admire Aurora" https://www.facebook.com/share/p/1Brw3LK9zY/ 73 DE muhsin TA1MHS
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3 cell lipo battery, how to use it anyway
16
By doing this you recharge the pack with storage function and will have only 3.85 volts per cell at the end of the charge for a total of 11.55 volts. Another my hobby is rc airmodell and normally put in storage mode the cell packs when finished the flights. I use charter M6 by toolkitrc. 73 Luca
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QMX test on SSB from a SOTA summit
Hi All, I activated a SOTA summit yesterday with the QMX to test it's SSB capability. I only operated on 40m, with the expectation that local stations would hear me well and many I've worked before could comment on my audio. It went very well and reports on my signal quality were very good. To my surprise and delight I was called by F5PYI and we managed to complete a contact! Larry was actually not bad copy but constant static crashes from an approaching storm made it hard to hear his call - this was with 5W of SSB on 40m in the middle of the local afternoon. There's a more complete writeup with photos on the SOTA Reflector. https://reflector.sota.org.uk/t/testing-my-qmx-on-ssb-from-a-summit/38137 73 David VK3KR
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WSPR without GPS unit
6
Hi I have been trying to set up WSPR on the QCX and have the following display WSPR call (without error) but cannot get it to transmit I cannot figure out what I am during wrong the start time is set and frame time is set The display does not change to give the WSPR info at the set time Any ideas??? John
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Does anyone use Solder pots for tinning and removing the enamel from the toroid leads? Any hints and tips? I see a cheap one on Amazon for about $20. Any suggestions if I should buy special solder for this, or use my normal Kester 63/37 solder in it?
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Region 1 Field Day
The Whitsunday Weekend is the Region 1 CW field day. Get your QRP Labs rig out into the field and have fun. https://www.darc.de/der-club/referate/conteste/iaru-region-1-fieldday/en/ My QMX plus will be there as DL0EU/P Solar panel power https://dxhf2.darc.de/~fdcwlog/map.php?form=referat&lang=de lok for me east of Hamburg -- Martin DK3UW
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yellow t37 torroids
#qcx
Hi probably a silly question but which bag do the yellow t37 torroids live ? i have 2 qcx+ kits and i have both red torroids in both kits but no yellow . thanks nic
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QMX+ SSB audio distorted on one band only
17
Hi, I installed the 1_01_003 beta firmware yesterday and I am amazed at how it has transformed my QMX+ (rev 2 board). I am, however, perplexed at the fact that the SSB audio is distorted (on another receiver) only on 20M. This only occurred after calibration and the audio becomes absolutely clear again after disabling the phase predistortion. All other bands have good audio with and without predistortion, and the RF output is within normal limits on all bands, although 20M is a little lower than others at about 3W. I am using a 12V stabilised PSU and a good dummy load, via a Bird isolator, giving me a solid signal into my receiver. Trying to think of an explanation made me consider that the LPF used for 20M (LPF 3) may not present a good load to the PA, so I looked at the LPF sweep using PuTTY. Here is the sweep for 20M: The 14MHz line is in a less than ideal part of the curve, whereas the bands which share this LPF are better placed. Is this significant? The phase calibration sweep for 20M also looks odd and is different to the others which are all nice curves (except 160M which sounds fine!): This is the 20M USB IMD sync optimisation curve, the title of which has been overwritten by the asterisks of the curve. The 20M USB curve looks identical: Here is the adjacent band 30M curve for comparison: Everything on the board looks good and the radio otherwise works perfectly. I am perplexed at why only one band is distorted (it really is unreadable) yet 160m, which has similar calibration curves but a great looking LPF, Sounds OK. Any ideas? The simple answer is to switch off predistortion, but that doesn't solve the problem! 73 Ellis GM4GZW
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Updated Wiki Page: QMX QMX_plus Debugging
#wiki-notice
The wiki page QMX QMX_plus Debugging has been updated by @Ludwig_DH8WN <DH8WN@...>. Compare Revisions
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QMX SWR measurement is not correct while using with PA
10
Hello! I've noticed that SWR protection stops TX when I try to use QMX with one of my PA. When I measure SWR with connected PA threw QMX hardware test it shows 1.8-1.9. And it causes SWR protection actuation (even if SWR protection level is 3 or 4 by the way...). When I do SWR measurement with Nano VNA or another transceiver they measure SWR = 1.1. So it looks like QMX is incorrect. That is strange... When I do not use PA then QMX SWR measurement tool provides correct figures (compared with Nano VNA). Any ideas? BR/Sergey UB3AZK
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My QMX arrived last week. Since I operate primarily digital, ( but seriously working on honing my CW skills) I was able to get several 'DIGI' mode programs to work. Not so easy with the SSB-required modes. I cannot believe the lack of YT videos on setting up this radio on digital modes. That will probably come with time. I now have Winlink, VARAC, FLdigi, etc. running. Some observations so far: 1. When I switched between two antennas I was testing last night, the QMX display suddenly shows only all horizontal lines, and the software loses contact with the rig. I have to re-start them. And NO, the rig is NOT transmitting when I remove the BNC connector. 2. I hope we will eventually have access to narrow filters in SSB digital modes. I have found that a weak DIGI signal becomes much stronger and copy improves when filtering to even 200Hz with my other rigs. 3. Finally, I must report my longest-ever ham radio QSO occurred last night on 40 meters. It was a QMX-to-QMX, JS8 contact with Cal, AD8Q in northern Idaho, 725 miles NW of my Colorado QTH, which lasted 2hrs, 17 minutes! I am very impressed with both the QMX and the INIU 10,000mAh PD power bank as recommended by the 'Ham Radio Duo' channel. On full charge, I am getting up to 22 hours of operating with moderate transmissions, and will probably see 14-16 hours of long QSOs like last evening. Not bad for $20 (on sale).
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QDX Low Receive but Xmit fine
8
GM QDX¡¯ers. I was gifted a QDX still in kit form so I spent a day building it this week. Except for one band, 80M, I got between 4.8 and 5.4W output which is optimal. The cure for that was to just put some more heat and re-solder leads on the inductors. I get reports of anywhere from -2 to -20. My issue seems to be with the received signal getting into WSJT-x. Although I¡¯ve made a dozen or so contacts on 20M and 30M, the db meter (I¡¯ll call the S meter) barely hits 15db maybe 20db on a real strong signal. Never higher. Most signals reports I give out are in the -17 to -10 range which would correlate with the db meter. I know from experience it should be a lot higher than that. I¡¯ve seen no signals decoded on 40M or 80M but I haven¡¯t listened at night which is going to be the most likely time to see those out in the NW. I¡¯m using a retired MacAir as the computer using OSX. All radio and audio settings are set to the QDX settings and to full audio by default. The Radio is set to a Kenwood TS-440. It gives the impression there is not enough signal/audio getting into WSJT-x but I¡¯ve got no way to adjust that. The antenna is a hexbeam for 20M and a 100ft high loop for 30/40/60/80 The version of QDX is 1.4 Any insight into this receiver issue would be greatly appreciated. I can live with the way it is now but I think with the receive signal stronger, it will show me a lot more stations. It may be MAC thing. I just don¡¯t know. Thanks. John / K7RLD
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QMX I/Q question
3
#qmx
With the official SSB firmware now supporting 3 virtual com ports, are we able to use the soundcard and I/Q at the same time? So can I do digital modes and have a panadapter? Would I be able to use IQ for a panadapter and still be able to use my mic for SSB? Thanks Randal VE7NHW
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SSB Calibration question
3
I have two QMX rigs, one I built (mid band version) the other I ordered assembled. The one I built was successful with the SSB calibration. However, the one that I received assembled from QRP Labs (high band version) fails the initial phase calibration on 20 meters, but passes on 17, 15, 12, 11 and 10. After which the all the bands calibrates fine with USB and LSB. I'm not a big SSB phone guy, but out of completion I would like to know if I should send back the High band QMX. I did the configurations via a USB cable and Putty in Linux. I haven't tried to initiate the calibration via the radio tools without being connected to a computer. Any suggestions?
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I plan to build a QLG2 GPS Receiver Module to use it with my QCX+ I will add: - the blue LCD accessory kit; - the Customized case kit (enclosure). I guess I will have to order it with the "Front blank cut/drilled plate. But what rear plate will I have to order? I might better build the Clock kit with its enclosure and the QLG2 GPS but will the GPS be inside the Clock enclosure? 73 - Pierre - FK8IH
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Sat 8:39am