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Hello, I have ordered QCX Mini 20m and I was wondering what power supply would be recommended to use for mobile operations? Any suggestions on save power supply, rechargable

Could it be that sidetone is somehow inducing some ripple on the 12V supply, and that in turn is inducing some AM modulation on the carrier? Paul -- AI7JR

Yes, the Vin signal is there, and is what we used for our battery.? There is also a similar JP right behind the audio connector with the audio signal.? So you don't need external connections except

Bogdan, If you really want to understand the Si5351, you might want to read this ap note: https://www.skyworksinc.com/-/media/Skyworks/SL/documents/public/application-notes/AN619.pdf It took me

FWIW ... There is a manual, force firmware load mode as well.That involves jumpering on the main board for the QMX series units. The unit is then 'seen' as a flash drive on a PC and allows for copying

Hello Patrick Years ago, when I saw the RTTY to CW translation in KX2 etc I thought that was a pretty neat idea and thought I'd put it in QSX. So yes, why not, we should have it in QMX/QMX+! But not

Murphy's Law of POTA. Here's what the manual has to say: The message can be transmitted multiple times according to the “Repeats” parameter in the Messages menu (see later description). The

Rob, Looks like the QMX and the QMX+ are different. In the past, all kits arrived without firmware, as you say. Today the QMX+ kit arrives from the "factory" with the latest firmware already

Hans and Dave - who have both brought me so much radio pleasure- what would it take to build more digital mode decoding and transmit KX2 style into QMX? Once SSB tx is available, would it be possible

Thanks for posting this link.? A very interesting tour!

A small tin of rosin soldering flux is very handy.? At the very least, get a small roll of de-soldering braid for when you need to un-do a solder joint.? A solder-sucking device of some sort is very

6C would be correct. ?It’s one of the hfe spec variants if the BJT -- 73 Jeff Moore W1NC

Thank you Jerry! For a kit, i.e. rig yet to be built, the 'factory state' is without the firmware, hence my question...

There's a total of 5 BC817s on the QMX+, one on each of the three SMPSs and two on the PA power modulator.? Are the other ones OK?? And would the assembly process use BC817s all from one reel for

Thank you Hans, Jerry. Indeed, this is now purely an intellectual exercise. Based on what you have said, it is clear this subtle effect is due to parasitic effects and not related to how the CW is

It seems that JP105 is a nice place to sold a socket and pin holder and get in the dev-board the GND and +9V points. There are soldering places both on the mainboard and on the dev-board for

Stan, Thanks for your comment. Looking at the rev3 Assembly Manual and Schematics it seems that I can send the +9V and Gnd from the 12-24 to 9V converter to JP101 on the mainboard. In which case I can

Bogdan, You might try checking CLK2 direct from the Si5351 for spurs, noise could be getting injected by the final modulator, the TX_BIAS supply, or just some unrelated parallel trace somewhere. Or

Hello Bogdan I think there are several possibilities. Some kind of measurement artifact is one. Who knows. But on QMX, CW is transmitted as a single carrier. It isn't produced by modulating a

I have a pre-built QMX low band that I received a couple months ago. I made a few contacts from my home QTH before taking it out to do a POTA activation. Every worked perfect at home and the memory