Hi, no, not a Wadley Loop. It uses a crystal oscillator (4MHz above the intended band) to mix the signal to a variable first IF of 4...4.6 MHz, and from there to a fixed second IF of around 50kHz. So each band needs its crystal. There are 5 free positions to add e.g. broadcast bands. I had a 16 MHz XTAL on hand, which gives me 12...12.6MHz for testing on amplitude modulation...
@@keithchambers-oq6nb Hi Keith, anttenna at home is a 2x12m doublet only about max. 7m above ground level, fed with old balanced 240 Ohm "TV" line, which I use on all HF bands. For portable operations I lately use EFHW with 10 or 20m length... 73 Willy
@@oe3wyc That gives me faith as I don’t have facilities for yagis only simple dipoles here..I used QCX mini for 20mtrs, vertical for /p operation similar to the Mad dog coils..Am total qrp as I started out, I had problems with alarms being triggered above 30 watts, construction the operation gave me a lot of satisfaction.. I just love to see why 5 watts goes, 10 watt SSB.. Am in the UK..made several radios over the yrs the arp labs is best to date really impressed, awaiting arrival of QMX, on order, this will give me more options/ P.. Thank you the reply..sometimes the algorithms give me interesting vlogs to view..
Good video. How did you activate the battery icon to read voltage? I knowto go to Preset then Other, then 7.2 then set to on. The indicator shows on screen but does not show any voltage. Your help will be appreciated. TNX de N7KO
Hi Ken, if I remember correctly, there is a pin-header where you need to solder a jumper from the 12V input voltage to the "DVM" pin. I'm sure it is somewhere in the manual, otherwise I wouldn't have it. Enjoy your QCX. Even though I have a QMX now, I like the soft sound of the QCX a lot... 73 Willy, oe3wyc + oe1wyc
@@oe3wyc Thank you, I read your note and by removing two screws on each side plate holding the back on I was able to remove the back and locate the 12v+ and the DVM holes on the pbc board, and solder in a jumper works perfectly. Thank you.
I have THREE QCX Mini's already and a QMX on the way, What should I tell my wife when she notices another on my easy chair table and she rolls her eyes back? Do I say I forgot to keep the light on again and they multiplied. I don't think she will believe me a second time.
Prima Gerät, hab auch ein solches und das CW-Filter liegt auch schon parat. Nostalgie pur. Wenn ich nur mehr Platz auf dem Stationstisch hätte, aber da macht sich der EKD 500 breit...so kommt der 1302 nur bei Portabeleinsätzen zum Zuge. 73, Ralf, DL5MHK
Well, one can't compare this tuning knob with that on the main transceiver at home. It is indented. But that is a good thing for a portable rig. You can step through the entire CW section of a band very quickly in 500Hz or 1kHz increments. Most stations today anyway are working on integer kHz (or multiples of 500Hz) frequencies, so you won't miss anything. It's very practical. I like it. Also on other portable rigs like the G90, the HB1B and so on
Hi Willy. Great video.. The excitement you showed at the end was the same as mine when my 20 Meter QCX came to life and I had my first QSO. When I started in QRP many years ago with a direct conversion RX and manually switched TX in my Lake DTR 7, I could only dream of the performance and functionality of the QRP Labs products we enjoy today.. I have several QRP Rigs in addition to the QCX Mini including Elecraft K1. KX1 & KX2 so do I need another QRP Rig? 🤔 Hell yeah! For me as I’m sure it is for you? The pleasure is in the build and then making contacts on something we built. 72 my friend Hope to work you soon? G0HFL 👍
Hi Willy. Nice to see the QMX in action with the new firmware. I've installed VS 010 last week. Here also some problems with the keyer. I have to make the letter and word spacing a little longer to prevent missing or longer dashes. Another thing I have: sometimes audio won't start up when switching the rig on. The only thing to get the rig working again is do a factory reset. Not sure if I did something wrong or is it a bug in the firmware? Btw I'm enjoying the rig verder much and nice to have power/ SWR measurements now.
Hi Durk! I think, if I do not switch the QMX off, when it is on 80m, the missing RX-audio thing does not happen. Try switching to another band, before turning of, or when it happened, switch to another band, turn off and on... Thanks, will try with bigger spaces! 73
Hello man, i just bought a argonaut 509 but i di know jow to power it and i don’t have cables aux and there is no amplifier. How i can start with a power suply 13.8v
Had a bit of a problem with my QMX but should be on the air this weekend, excited. It was not an easy build for these eighty one year old eyes but a lot of fun. I would like to try it again knowing all the things I learned on the first build. I am having fun with qrp with my QCX. QRP Labs puts out some really nice products.
Yes, I think there are less components to install than with a QCXmini, but even with my 56yrs I needed a good magnifying glass! Hope all works out fine with your QMX!
The QMX is a fun radio to have. I've had some great success with mine at POTA. Really looking forward to getting AGC and possibly SSB. If Hans can properly implement SSB then it will probably make for one of the cheapest SOTA rigs you can buy.
My assembled QMX is in the 200+ shipping position. There's been enough chatter on the forum to dissuade me from building it. It was an acknowledgement of aging eyes that convinced me to just get one assembled. Nice radio series. If a new ham was restricted by funds I'd recommend this series of radios. They'll get you on the air very easily and because it's CW, even qrp signals do well.
For digimodes yes. In CW I couldn't see any, but I'm sure that will come with one of the next FW releases. There will also be some sort of SWR (maybe also power) indication...
Very nice thanks. Built a few QCX kits and found they compare very favourably to commercial rigs on CW RX. Have a QMX kit on order and looking forward to building it.
Nice to meet friends here! Thanks for the video Willy, I‘ve baught the qmx kit from Hans in Friedrichshafen. At first I finished the build of my QDX baught last year, it works great! The QMX will follow soon, looking forward to the features that Hans will pack into the software in future updates. Vy 73!
Hi Wolfgang, so soon we will have an 2xQMX QSO :-). Although less components than e.g. with the QCXmini to mount, every mm counts, so take your time (and a microscope HI) for the build. Currently SP/OE3WYC 73!
Thanks for posting this video! I was just wondering if you built this for 12 or 9 volts? If 12 volts what are you using? From what I'm reading there's not alot info regarding exceeding the 12 volts, ex 13.8 volts. Perhaps a Buck converter to solve this issue?
Will power the QMX with 3 LiPo cells (like I do with the QCXs). So, if they are fully charged, we will be at around 12.6V. I think this should be no problem for a "12V" QMX. Here for the first QSO it was on a lab power supply set to 12V, but I also checked it at 14V (for a short while, even in TX) , and it was not destroyed immediately ;-)
no, no, on the contrary, it is quiet. I had problems with the recording. But since it was the very first QSO with the just assembled kit, I still posted it... 73 Willy
I've got a QCX-mini, which is a delight. I'm waiting for SSB to get this QMX. Given as-yet-unused power of the chip, this QRP-Labs transceiver is only going to get better and better over time. My only frustration is that I can't operate the digital modes from my iPhone.
There are some firmware bugs. I can' t lower audio volume to zero and sidetone volume settings not working as it should. Had a lot of fun on all bands so far and 20m sensitivety is ok now. I compared a weak stn with my TS480SAT. Equal reception. I'm a CW guy. Don't care for digi modes or SSB. BTW on my YT channel is a short video as well
The firmware will improve over time... Thinking of SWR meter etc. where the hardware is already there ;-). Have same "issues" as you mentioned. And hoping for a "broader", less tiring filter. Will watch your video now :)
