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Hi Rich All future kits will be supplied, once current kit batches are exhausted, with only #28 wire (0.33mm). This is because I tested very carefully including power output, efficiency, harmonic

Hello, I was very proud of my 3:3 weird twisted sister when I made it yesterday. Today I realised I used the #28 wire and I should have used the #22 wire. Will I need to desolder and remake it, or

Steve, I've had similar issues with the encoders on my QMX. My solution was to fit a couple of small capacitors to de-bounce the contacts and that has completely resolved the problem (until the

It is amazing that the "Envelope Elimination and Restoration method" was there alreay in the 1950s despite limitations in means for implemention. I wrote up a little overview of the methods, called

My 1300 session was great fun, I got a real pile-up on 30m, and also made 2 QSO's on 17m 10 QSO's in total with 4 QCX/QMX worked. 1900 session was not so succesful, 1 QSO on 30m and 3 on 60m, and only

Hi Hans, Researching and filing a patent is a very expensive proposition for a company. When I was working, the typical cost of patent searches, attorneys, and filing fees was in excess of $10,000 so

Hi Tony That's good to know, and well deserved. Glad to hear Motorola have good policies. Around 15 years' back I was a critical part of the world's largest commodity derivatives transaction which

Hans, you’re correct. Motorola benefited from our patent filings but as employees, there were a few tiers of monetary awards. The first tier bonus was awarded if Motorola decided to file a patent.

Ok, rewound it using the "WTST for 9V transceivers (“Weird Twisted Sisters Transformer”)" And then I realized I am kind of slow.? I was thinking my oscilloscope was showing 40v peak, not 40v

I think that the "problem" has been resolved. I have added a jumper from the encoder GND side to a known GND (see pg 48 of the manual + photo). All has been stable since. Thanks to Joe, VE7BFK, for

I was one that dismissed and still do the uSDX not that it could not work but it was very clear after working with it the classic issue of not enough CPU or bits to do it well.? Getting a ATMEGA328

Additionally, performing the analysis posted by Jeff Moore,W1NC, I see in phase signals on pin 1 of IC406 and pin 1 of IC405 ( not 90 degrees out of phase)

Performing the ADC test the results didn’t look anyway near the graph in the manual. After doing more scope probing I discovered there isn’t a CLK0 on pin 2 of IC403; but there is CLK2 on pin 14.

Hi Nicolas, Thanks for making your QMX cover design public - I printed one and am very pleased with it and mentioned it in a post to this list some weeks ago. I solved the problem of the radio

I'll look at removing T1 and rewinding it. Thanks!

The QMX should not need an amplified mike, just a $0.5 electret mike.? Build your own case, cable and switch. Electret mikes are amazingly good with a very flat response.? I don't know if Hans is

Not that I'm aware of.? But some have found that they didn't get all of the enamel off the wires that solder into the board - especially with that thicker gauge wire which has thicker enamel.?

I just received two of these from Adafruit.? Nice small size, built in adjustable preamp. Takes 2.4 to 5vdc for power. https://www.adafruit.com/product/1063 73! Mark K9TR

I got a nice honorarium from RCA for my patent, and it was a factor in my performance review, presumably Motorola had a similar process in that timeframe. 73, Don N2VGU

Right, I was noting the RF sweep because the low pass filters *do* affect receive, so the fact the sweeps are way off could mean something with the LPF section.? Or it could mean I messed up both