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All, Just as a reminder the TX signal on my QDX is working fine.? The issue was the secondary check that the MPU does for a valid tone to set and not a failure of the I/O output.? For some reason,

Bob, Maybe try another PC if you have one.? As my posts in other threads have stated I am having issues with one of my Windows PC.? The Raspberry Pi seems to work fine. The lack of current draw when

Thanks Evan I put the QDX in its case. The USB cable has ferrites on both ends. I also coiled the excess length and tied it together. For these tests I'm transmitting into a dummy load and using 9

Love that movie! Roy WA0YMH

There's something like the 'law of unintended consequences'. You do one thing that makes sense and all sorts of things happen that you didn't expect. -- 73, Dan? NM3A

Brian, quick first question is what are you using for a power source? “Wall wart” supplies are notorious for not always being well filtered and can cause such issues. Ron

I just completed a new Progrock using the recommended power/regulator setup.? The voltages are correct, correct parts, no shorts on the boards, controller installed in the socket correctly. . It

Hi Fred I don't agree... When the pin is an output, the processor sets it at either 0V or 3.3V. Provided its current handling capability isn't abused, it doesn't matter what voltage it is "pulled up"

Interesting. I am reading that you should not have those pull-ups to 5V there at all if the pin is used as an output. The inputs have clamping diodes to clamp the 5v input to 3.3v. If anything having

Hi Evan. In my previous work life, I made use of the fact that most CPUs never go totally to 0.0 volts, they usually will be above zero and well under 0.5 volts. When I was trouble shooting a CPU or

Clickable: https://ae5x.blogspot.com/2021/11/spectrum-analysis-qdx-on-60m.html -- John AE5X

For those interested: https://ae5x.blogspot.com/2021/11/spectrum-analysis-qdx-on-60m.html -- John AE5X

Hi Matt, Have you measured your RF voltage at the output of T1 yet with your probe? The RF should be about the same as at the BS170’s, this is the junction of C32, C34, T1. C32 feeds the voltage

An additional note: RS232 logic "1" is a negative voltage, logic "0" is positive. TTL logic "1" is a positive voltage and logic "0" is 0 (or a very low positive voltage)---NORMALLY Milt W8NUE

I think it's the "just-in-time" inventory thought process that puzzles me as an economist the most. I can understand skimping on inventory during the Carter years when the prime interest rate was 21%,

He is actually the chief engineer. I was an engineering officer in the merchant navy and we were all more important than the captain and other deck officers. They were just the engineers "look outs"

I get this constant tone as well. Will hope for a fix even though the mini is still usable. 73 de Arnie W8DU

Reminds me of the joke about the gentleman who invested all his money in toilet paper and revolving doors. He was wiped out before he could turn around................ Lee KX4TT

A friend of mine is a Technical Marketing Engineer for Microchip for one of their uController lines. He has told me numerous times that every month they could sell twice what they produce and they are

Well, it reminds me of my favourite "Snatch" movie line... "Never underestimate the predictability of stupidity". 73 Hans G0UPL http://qrp-labs.com wrote: