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When you say using a 7809, I am assuming that was not added to the QDX, but rather the power supply or in between the PS and QDX. Bob KG5GTE

I look forward to it. Thank you and I do not have mine yet. Jon

Hans, the QMX kit arrived today just in time for the new firmware! We are ready to go :-) 73 Marcel DM3FAM

Once my next QMX kit comes in I will consider putting up a detailed video on assembly.

Roger that Evan! Yes, an oscilloscope is called for here! JZ

John, A failure of one of the two orthogonal outputs of the Si5351 could explain the symptoms.? He measured 2.5 volts on two of the capacitors.? A total failure would have 2.5 volts on only one of

Dave, If the peaks are at 20 M, and the subsequent low area stays low, you should be able to go with that. You're really interested in a passband at your frequency of interest, and then a

The RF Filter scan is the bandpass filter. If you compress the 20m portion of the bandpass toroid it will lower the band pass a bit. Honestly though, your plot is good enough. -mike/w1mt

Hi all, Just got my QMX finished and on the air. I have just done an RF Filter scan and I am a bit confused by the graph results. The graph looks more like a bandpass filter than a low pass filter.

That's great Chris! Now go hook up an antenna and get on the air! Good Luck!..JZ KJ4A <clansd@...> wrote:

Thanks to all for the inputs. From the articles provided, it appears that the sense of winding does matter and both ends of T507 should be wound in the same direction. That's what I'll do. Hope to do

Hi Hans, Ah sorry, my bad, this has been answered. I received the kit but not the 3-500Z final (only one, I assume, because this is QRP after all...), so haven't yet downloaded the assembly manual.

Jim his email is on QRZ. 73, Bill NZ0T

Hello Brandon Perfectly good question - currently the QMX doesn't have a facility to use the 1pps from the GPS to calibrate the TCXO. It's hasn't been drastically urgent because I find the 25MHz TCXO

Evan, Could Charles' clock generator have failed? That might be another way that the Tayloe detector is not passing 2.5 volts out to all four caps. Stuck on one decode. JZ

Hi all I was wondering if anyone knows of YouTube video out there on the assemble. Jon

Hello All, I am very proud to say that after 2 previously suspect QCX mini builds (i.e., built like a kindergartener with a lightsaber), the more complex QMX build was super successful after taking my

Hi Brock On page 61 of the manual I suggest 7V supply at 250mA limit; probably these could be reduced; QMX will work properly down to about 6V supply. I measured 230mA or so of current consumption in

Thanks for that Hans, The manual suggests 7V and a 250 mA limit,? I'm tempted to try getting away with less.? The CC/CV module has arrived, with a small volts and amps module.?? That should make

Charles, Based on your measurements, it could be that IC4 is bad.? It could also be IC5, IC7, IC9, or any of the ICs on the 5-volt line. I would lower the voltage to 7.5 volts to minimize the power