QMX: Multiband Multimode QRP transceiver

[@davidhorner7689]

Hmm a multimode? Whoa. Love the quality of and easy to build Qcx+. Today I tuned around 20m to only find one weak station calling cq. Had the QCX+ and a yaesu ft818 connected via a switch to a 20m dipole so I could switch between them. They both received the same weak signal but The QCX+ with its audio filter brought it out and made it more readable and it even decodes the cw on screen. WOW. I tuned the 15mhz time station and the Qcx did better. Thanks Hans. I highly recommend the QCX+ and other things from QRP-Labs.

[@Lyndon_K]

Good day Hans, I just finished my QMX and I have made about 8 contacts so far. The bands were pretty much wiped out today due to a large solar flare but I still managed to work some very weak POTA stations. Lot's of fun! I will be taking the rig to the park soon to do a POTA activation. 73 DE VE3IGS

[@G6EJD]

Now that’s a real engineers bench🙂

[@krahwinkel9503]

I received the kit a few days ago. Knowing the quality of QRP Labs kits I do look forward to build it. I now own a QCX, a QDX and the QMX. Again a very nice piece of engineering - thank you Hans.

[@axelkohlgrueber2453]

I just finished building my QMX. Works excellent. A lot of high tech in a small space. You have to be very careful when assembling it, but if you follow the very good assembly instructions exactly, it's quite easy. Another real hit from QRP labs. That can't be topped anytime soon!

[@HiltsyAdventure]

Im a little worried about the build, but I got new solder tips and also a third hand with a lit magnifying glass :) it will be a couple weeks before Im home again and can build it.

[@axelkohlgrueber2453]

@@HiltsyAdventure Hello Hiltsy, don't worry, it will work. What I use: Soldering station = Ersa I-Con pico, 68W I usually solder at 450° Celsius. Head loupe: Carson LumiVisor 2x/3x/5x/6x, works well. After only a few solderings, I immediately check for contact, with the enameled copper wires after each individual soldering! To do this, I clamp two fine sewing needles to my test probes. Have fun building.

[@KO4VNX]

The development of this unit is a significant lifetime achievement in itself!!! I bought one of these a year ago, but many life events have interrupted my HAM life, but in the next few months I will be making use of this. Just refreshing myself with this unit and I must say, I would expect a very large agency to have spent many, many work-years of effort to implement this level of complexity and feature set!!! You, good Sir, are a mad genius!!!

[@sudhakaryg]

Thank you QRP Labs team. QMX is an Amazing Kit, I received mine last week & assembled it. Just powered it on to test. Uploaded the firmware. Its working. Will try it out sending some CW / Digi mode ops..

[@Paul_VK3HN]

A remarkable design achievement from every angle, it has been inspiring to follow the lineage of the ideas, engineering and fabrication of this product from one ham's workshop.

[@virilis]

This is such a great progression! I'm looking forward to SSB on the QMX! Meanwhile i will build it and use for QRP CW in the field. Kudos, great work Hans! 73

[@virilis]

I just had to laugh so much with "for the qrp fanboys"😂, love it, thanks Hans!

[@stubryant9145]

Another winner! I guess it is about time to get my QDX built then think about building this one. I'm sure QSX will still have some advantages, but this QMX seems to edge closer yet to the QSX's capabilities. Can't wait to hear more about the expected SSB mode implementation.

[@dansloss2566]

Great kit, Hans. Very careful soldering required. Looking forward to the testing / trouble-shooting info to see what I got wrong in my build.

[@JonathanKayne]

The qmx is incredibly fun to use! Really looking forward to AGC and maybe a 40-10m version!

[@DaveW6OOD]

I like the long videos. They have lots of info and insight. I can’t wait for my QMX to arrive and for future mods and firmware. Excellent work.

[@rogerinwales]

Excellent Hans, can't wait for the mid band version. In the meantime i'm enjoying my QDX & QCX mini!

[@MiscDotGeek]

Congrats, Hans. Can't wait to get mine built. Looking forward to the SSB/EER firmware.

[@barrybogart5436]

I can't wait for mine already built with SSB, upper bands. Can't wait to ditch the Tru(SDX).

[@Tishers]

order placed, thanks! Another one to accompany my other QRP Labs radios

[@hcy0]

Great device. Would be nice to have 17 and 15m instead of 80 and 60.

[@haramanggapuja]

Agreed. By which time we can hope for the sidetone volume & AF volume adjustment function to work. Having one for 40, 30, 20, 17 & 15 would be super for POTA/SOTA/BOTA/IOTA ops. As it is, however, it’s a very nice QRP box. I’m enjoying mine & am, of course, looking forward to FW updates. 73 de W8IJN

[@ai5dd]

There is an option for that now

[@randalltom9750]

I've got five of your amazing transcievers... My new QMX is only a few weeks away from arriving. I'll keep em' all, Thanks Hans!

[@ve3sif]

Can't wait to get mine, Hans. This will be perfect for my bike ops. love it. 73 and 72 Ron

[@ksb2112]

Hans, you are a genius....

[@John_Smith__]

Yes! Another Awesome QRP-Labs radio wonder!

[@votisb]

My kit arrives next week. Very excited. I've built the (tr) uSDX which was fun. This looks to be a more complex build and am looking forward to the challenge :)

[@thuff3207]

Way too cool and that I did not know I needed. Thank you for all your hard work to make it.

[@Liberty4Ever]

That looks great! If you're taking requests, I'd love to have QDX+ which would be pretty much the features of the awesome QDX, but with the option to run 20 W out, and with good heat sinking on some TO-220 sized final amplifier transistors so it'll reliably operate in the field in desert conditions (50 C ambient). Bonus points it it could be ruggedized to be waterproof or at least splash resistant... IP-54 or better.

[@N4GW]

Very nice. Can’t wait for SSB

[@Fantik22]

QRP-labs make killer of KX2 😁😁😁

[@shrumby7231]

I've enjoyed every kit you've done, Hans. Keep up the wonderful work. Don't listen to the impatient people whining about SSB. It'll be done when it's done. If not, then not. Nothing promised, nothing lost.

[@ScatManAust]

I'd like to buy the high and low models when ssb is out. Looks awesome project

[@resistor--1816]

I just love my little QDX, so I had to order one of these too!. Thank you so much, Hans, for helping me with my confused ordering.

[@Frank_K4FMH]

For the Three Little Bears, the middle porridge was just right. Just use the length you think communicates what you want to say, Hans! Mine is on order...looking forward to it when it's done.

[@theAF5D]

Nice video, Hans! Can't wait to get my hands on my assembled QMX and QCX Mini. As of today #6 in your waiting list 😅

[@hcy0]

Waiting for the mid-band version (40, 30, 20, 17, 15).

[@mabo4848]

wow !! if id had SSB its fantastic !!!! i ordered 2 month ago.... 73

[@BackcountryGearShed]

This was the most complex kit I've built so far, but also had the most detailed and thorough instructions. I look forward to building another QRP Labs kit.

[@technishn]

A nice video of the functions. Keep up the great work.

[@Steve-GM0HUU]

Thank you for video Hans. I don't mind longer videos. I have ordered a QMX. Looking forward to building it and hopefully getting it on the air. The only problem is that it might make some of my QCXs redundant 😂.

[@pongo1372]

Just received mine, what an epic design.

[@SpeakingArrow]

Looking for the green light from XYL which I expect once I can talk a little with her. Love the kits, all of them! My first QMX will bring my total owned QCX-all models most bands to 12.

[@Steve-GM0HUU]

😂 My long suffering XYL allowed me some radio pocket money recently. First thing I ordered was a QMX kit.

[@warplanner8852]

I shudder to anticipate the future!

[@JxH]

POTA operations are often conducted (for example) at a picnic table less than 10m from the vehicle parking spot, so equipment size and weight is most often not a major concern. SOTA, where clambering up a tall hill or mountain, yes of course. Major concern.

[@SansNeural]

I've done a couple of Field Days with my QDX at parks. It's kind of fun to lug my big battery and a solar panel out just past the picnic tables... then pull my radio out of one shirt pocket and my wire dipole out of the other.

[@bill-2018]

It looks wonderful. They all do. Small and great features, ideal for out and about. Good price too. I'll keep an eye on it. Puts my h/b ssb/cw G4CLF based one to shame in terms of size but it is years ahead. 73, G4GHB.

[@M7XCB]

Fantastic engineering great video.

[@DonzLockz]

I was looking at this on your website the other day after seeing a video on it. Great value for money and well designed. I was unsure on all options and need to look more into it next year, already blew the budget a while ago.😅

[@jeromekaidor7254]

QMX is on order! I thought of having Hans build it, but at 25 builds/week and 800-ish orders already in the queue, it would have taken way too long.

[@daijoactual]

Got mine and love it!

[@andrerobitaille559]

My god, it’s full of stars.

[@barrymayson2492]

If I build it " my God it's full of smoke "

[@patring620]

Yes, David.

[@DrFredism]

I do value and appreciate all your work.

[@russ_vee_jr4199]

Hans, I would sit for hours listening and watching any one of your videos. Do what you think is best to pass your info onto us! BTW: I will order the QMX in a few weeks. Really looking forward to the addition of phone functionality. This is a long post, Folks. Must get back to practicing CW. I started with CW by counting DOTS/DASHES 45+ years ago, and it's cursed me ever since. Several years ago, I worked up to copying @ 20 WPM @ about 85%/90%, but jobs/family put HAM activities on the shelf. However, your kits have pretty much reversed that. BTW: I'm a retired Over-the- Hill, Has-Been Digital Electronics Iginier, very-very into my senior years, and as you know: 'You can take the Engineer out of the Lab, but you can't take the Lab out of the Engineer!' My specialties were Digital Designs of Embedded Real-Time Machine Controllers, High-Speed Mil-Spec Comms, State-Sequencers, and Four-Bit Slice designs, along with much Assembly Language Code to test my hardware and prove to the Software-Pukes that a degree from Dartmouth didn't make them hardware or software engineers. I provide this info to demonstrate my history of: 'Bin-There-Done-That' So, with that being said: I consider you to be an outstanding engineer! Your Hardware Designs are a demonstration of simplicity that provide the intended functionality. And, the functionality of your Sofware Design(s) is/are SUPERB! The combination of your Harware/Software designs demonstrates that you defined the product's functionality, outlined the code, detailing the tricky stuff, then flushed out the hardware, finalized it then intergrated it all together. As I matured as an engineer, that became my Design Path. Hans, your Work Output is outstanding, SIMPLY OUTSTANDING..........

[@JustMe-dv5ix]

Oh Normal Ops are CW Hams, Not SSB as some would like to believe. Good Job Hans

[@valerijlukianiuk850]

Yes Sir gd dr om 73

[@larspregge6420]

It would be great to choose other bands as "only" 80/60/40/30/20. May i'll work only on 40 and higher bands or WARC... And OLED Display would nice too. But, thats again a really great work.

[@JN57in]

waiting for highband version with ssb or allband with ssb...but good job until now!

[@M0NTVHomebrewing]

Looks brilliant Hans. Many congratulations! 73 Nick M0NTV

[@LA9RKA]

Nothing wrong with long videos. ;-)

[@PetrVojacek-uw3ud]

i need ssb when will it be operational?

[@markhealy9361]

Looks like another super product Hans. 73s de Mark EI6JF

[@Steve-GM0HUU]

Yes, I think it does look like a winner - an excellent evolution of the QCX and QDX. Several interesting design ideas implemented. The highly efficient buck converter that auto shifts frequency to stop QRM is just one example.

[@HiltsyAdventure]

Just bought one the other day coming all the way to Iowa :) I cant wait to build it! 73 KF0GZB

[@Tamlin73]

This one with ssb and 20-6meter will be a winner :) i want one, i think its to many to advanced radios out there, i want a nice easy one, i have several of the chinese clones, and they are realy cool, but maybe not the best quality, so your radios is the best but for me its not realy there yet, since i dont use digital modes, and i like the higher bands best, but i promisse to get one some day :) best regards and 73 from Norway.

[@rst5nn]

This is what we are waiting for =) 😍 But anyway, I still like my QCX =)

[@jeffdyer2393]

I wonder if you have plans for a 50 watt multiband cw ssb amplifier.

[@FubarX]

I will buy this when SSB come ... cant wait

[@davidhorner7689]

I have a pair of jumpers to bypass the cw filter. One pin of jp11 to one pin of jp12. It works nice to receive USB and AM (10 and 15mhz wwv and shortwave stations) and hope to add some kind of ssb modulation for xmit.

[@robertallbright]

Very impressive 73 Rob G3RCE

[@harrymagooslum5770]

That looks like another winner, Hans! Good work. One question: the QCX-mini ended up getting a AGC to handle the wide dynamics and looking at the schematics for QMX it seems to have fixed gain. Is the dynamic range of the ADC sufficient to handle both very weak signals as well as strong [local] ones?

[@QRPLabs]

In QCX-mini, AGC is a matter of operator comfort, not dynamic range. It keeps the volume level at the earphones reasonably constant. QMX is an embedded SDR (Software Defined Radio). In QMX I used a very high performance ADC having a rated Spurious Free Dynamic Range of 110dB. As a comparison the ADC used in the Elecraft KX2/KX3 rigs which are a similar SDR, has SFDR 103dB. It's very important because if you use a lesser ADC, and attempt to compensate for that by putting variable gain blocks or attenuation ahead of the ADC, you do NOT increase the dynamic range, you just move the dynamic range window. Yes you can receive weak signals as well as strong ones by doing that - but that isn't the point of high dynamic range; high dynamic range gives you the capability of receiving weak signals you want, in the presence of very strong ones a few kHz or 10's of kHz away. The only way to achieve this is a very high performance ADC. Not gain or variable gain/attenuation before the ADC. Then subsequently the gain is applied digitally, as well as AGC. At the audio output, volume control is also applied digitally - the output stage uses a 24-bit stereo DAC. There is plenty of range available to be able to apply gain control digitally and still have plenty of bits of resolution to not distort the sound even at low volumes. The very high performance ADC chip in QMX and the careful analog design ahead of it (same as QDX) gives these transceivers a performance which beats many expensive commercial transceivers by the big names.

[@bob-N4REE]

How well does power output on the high band version compare with the low band version. On other similar products, there's a disappointing fall off for the higher bands.

[@EC5ABG]

Gran trabajo!!, 73.

[@firewaterforgeofarizona4304]

Any word as to when the SSB update will come out?

[@edwarddavis3748]

Probably never. Look how may years it’s been.

[@edwarddavis3748]

I will buy one when ssb is operational

[@apunctg]

I can see the built-in microphone it doesn't show in the pictures that are displayed on the website ... is that the last iteration or this one in the video ? thank you ... 73

[@QRPLabs]

The prototype enclosure didn't have a hole for the microphone. And at the time I build the pre-production QMX shown in the photos, I didn't yet have the microphone as it was one of the last components to arrive. ALL of the sold QMXs all have the microphone, and the QMX enclosure with the hole for the microphone. Only my one is unique in not having it!

[@apunctg]

@@QRPLabs great ... just ordered one ! Great job Hans ! 73, M0IVI

[@polarbear5464]

Can I use 9V with the 12V version?

[@Lee-M0VKR]

Such a shame my QMX has gone missing in the post, ive been chasing it up for 2 months 😞

[@larspregge6420]

Who need 80m for /p? 40m and less/warc would be nice. And OLEd for less power. But, great work as usual.

[@o2bnov0307]

I love the key fob portion of the PCB! Is there a future 10-20m QMX possibility?

[@JustMe-dv5ix]

Yes you can pick that option when you place your order.

[@jdschauss]

Hans, you know my money is on the way, my friend. Congratulations on moving forward with your long-awaited QMX transceiver! K5SFC

[@gregoryhorwitz7373]

Just amazing

[@edwarddavis3748]

Can’t wait till you have the qsx

[@エルネストムーアガルシア]

Thank you, Hans! My QMX should arrive sometime in September/October -- in the meantime I am happily using my 3 QDXs (high band, low band, single band), QCX mini, and (my first QRP Labs radio) QCX+. Your kits are fantastic. I am very interested in the future SSB firmware addition to the QMX. (BTW, the "fanboy" key fob is brilliance.) Q: Has the QMX platform now incorporated the legendary QSX project, or is the QSX still to come at some future date? Cheers and 73 Garu

[@QRPLabs]

QSX is still to come!

[@MrCowboybud]

Will it have the AGC board installed ? I know it is an option with the QCX mini

[@brianfields4479]

Does this have agc built in, with the assembled version?

[@JustMe-dv5ix]

I would like to know that as well. I placed an order today and the doc's never mentioned the AGC.

[@michaeledmonds3027]

I ordered my QMX in October, 2023, with SSB in mind. What mini hand mic would you suggest that would pair nicely size wise, please? Thanks, Michael

[@junyangxx]

N7KOM showed a DIY mini hand mic, made from a Baofeng-type mic+earphone with a PTT button.

[@jeromekaidor7254]

@@junyangxx WRT Baofeng mics - I got one with a UBITX transceiver. Reports were always that the audio was "thin" and weak. Somebody else took theirs apart and discovered that the actual microphone is a little tiny electret element. AND the hole to get sound to that electret was very small, almost invisible, and set off to the side. He took his Baofeng apart and drilled a new larger hole through the case in the middle of the mic compartment. Big difference. Louder, more balanced, more punchy audio. I just did the same, haven't tried it out yet.

[@rodrigobuzatti]

I would love to have 10/11 meters band on QMX... is it possible to make changes?

[@JustMe-dv5ix]

You can order one that has 20, 17, 15, 12, 11, 10, meters I orderd one today

[@R2AUK]

👍 ❤

[@ManojKNayak]

Any update on qsx?

[@merlinridesagain]

+1 Fanboi

[@TridentMissileTech]

Where is the waiting list?

[@billryland6199]

You still have not finished the QSX SSB transceiver. I waited for it several years. All these CW rigs only interest a minority of hams. We need small SSB rigs for normal ops and digital modes. I built the QSX 10 watt PA before giving up on it and buying an FT-891.

[@graeme9184]

The majority of so-called hams with the baby, easy peasy licences are too lazy to learn morse code.

[@elektrophysiklk]

great 👍

[@McCarthyIrene-i3f]

Feeney Curve

[@DrFredism]

I had been waiting for this but I want voice and winlink

[@KevinRobinson-b9v]

Stark Motorway

[@littlebear5219]

Can buy a qmx now please

[@QRPLabs]

shop.qrp-labs.com/qmx

[@edwarddavis3748]

I will buy when it has ssb

[@edwarddavis3748]

I don’t think the Mx will every come out with ssb

[@BillyRachel-d2c]

Cronin Avenue

[@MiltonSteed-p1l]

Spencer Street

[@MaxwellMarshall-i4m]

Feeney Brook

[@PaterCherry-l2k]

Waino Dam

[@DefoeArnold-f3p]

Frederique Lights

[@ChapmanHenley-c3g]

Carlotta Fort

[@DawneJosselyn-e3g]

Ray Alley

[@MathildaArthur-e4l]

Hickle Green

[@RockefellerAbbott-m9s]

Sheila Street