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I tested my LPF sections with a Nano VNA, and all the frequency plots look good to me.? In fact, the 40m LPF looks to be right at the bottom of the 40m band, but the power output on 60m is 4.5 watts

OK, John & David & anyone else even mildly interested. Back in a couple of hours ! 72, Bill, N4QA

On Mon, Jul 17, 2023 at 2:13?PM John Zbrozek <jdzbrozek@...> wrote: > > Roger that, Bill! > > I am away from the home QTH right now , else a QSO attempt would be made. > Maybe sometime soon I

Roger that, Bill! I am away from the home QTH right now , else a QSO attempt would be made. Maybe sometime soon I will hear and connect with your mWatts level signal!...JZ KJ4A

QSL, John. I'm seeing 16 reception reports, anywhere from -16 to -23 dB SNR. May shut down temporarily while I mow Maggie's ( 7 y.o. Springer Spaniel ) Klawk Bawl Field...it's an? inside thing :0)

I'm currently sitting on 20m FT4 and will leave it on there...

Your 20m PSKReporter footprint looks amazing considering the QRPp. 72...KJ4A

Well, I've moved to 20m as this will give David & I a better chance for a Q. And, besides, I enjoy a ~ 6.99 dB power increase ! 10 mw out on 40 and 50 mw out on 20. 72, Bill, N4QA

Well, I wish I could rename this topic title to "QDX non-functional" or something like that, since I'm now not convinced it's a firmware loading issue. I searched the forum for EEPROM corrupted and

...good job!

Good nob, Paul, and a good component selection. I checked the current handling capacity of the 1N4448 to make sure it was adequate...looks good. I may run a sim with it but my first take is there

Hans Thanks for the explanation. I will eagerly await further developments! -- 73, Dan? NM3A

Attached is a photo of a 1N4448 diode placed across L14.? This diode has half the junction C of its brothers, the 1N4148 and 1N914.? I doubt it matters although it would be interesting to adjust the

Willie, your question is interesting, but I have not given it any thought yet. I will chew on that for a while and return. JZ

Dan, here are two simulations. One has a diode across L14, as Paul described. One does not. You can see one leg of the diode dangling. The plots show the drain voltage at the BS170 transistors on the

Do the numbers also vary depending on the SWR of the connected antenna? 73, Willie N1JBJ

Dan, The QMX modulator can gradually increase or decrease transmit power in response to its DAC input. One possible use might be to recognize a "tune" mode and preemptively reduce power to a safe

So, 1N914 directly across L14 with cathode to +12V and anode to T1 C.T.? Any other relevant details to share? Paul, W9AC

Hello Bill, What is the OS on the PC you are using?? I assume it is a Windows version by the reference to device manager. Try disconnecting the USB cable, rebooting the PC, and connecting and

It sounds like you have a handle on the power supply and the conservative voltage save parts :) Perhaps a search of the threads will turn up a list of what others have found. My guess is something