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My OLG2 works great with my QRP Labs Shack Clock. Now I want to use it (separately) via USB to a Raspberry Pi. The device is recognized as?/dev/ttyACM0, but when I type "cat?/dev/ttyACM0" no data

Thanks for the correction. Yes, I did put in 47 v zeners and not 1N4148 as I typed. My error. I was more interested in responses to the main Question of my post — why should only Q9 be the failure

Well, I obviously re-soldered Q103 in place HI. I realize it was not clear from the previous post...

Thanks, Allison. I remember studying switch-mode power supplies in my electronics course, but that was quite a ways back. Time to pull out my textbooks. Lee

Jim I ended up desoldering Q103. It was almost ok, except for the source pad which didn't like it. I soldered a wire between the sources of Q103 and Q105, replaced D101 with a THT one (it was toast)

Hi Chris, all > Hans' experiments are designed to demonstrate no failure and so do so. > I'm nowhere near so easily offended or anything, and I do very well know and understand exactly the bias

Martin and others, Thank you for the reply I appreciate it very much, I have used FT8 a lot on 3 different radios so I understand that some fiddling may be required. I run it on a net book with my my

Thanks for the tip about power measurement. I was not aware of either ALT-Right or CTRL-Left clicks. I did no see much difference between conventional and WTST

Jim, Recently ordered kits are checked for the sort before sending them out. Hans says he moves Q103 with a hot air system if the short exists. Maybe he as a smaller nozzle. I suggest you be sure

Thanks Tony Very useful into to know. 73 Hans G0UPL http://qrp-labs.com https://buymeacoffee.com/g0upl

Tony, You can clearly see the improvement in coupling that the twisted winding has over the conventional winding, with the expected improvement in leakage inductance as well. I think that is

FWIW here is what I measured for the conventional and WTST using my nanovna. I verified the calibration when I saw the negative inductance for the WTST at

I ordered my QMX kit back in March. After a three month wait it arrived. Didn't take long to realize that there was a critical part missing: the binocular core for T-507. I ordered a new one and after

Hans said: “Then again what does the datasheet even mean here? It says Drain Source breakdown is 60V, with conditions Vgs = 0 and Id = 100uA. But how to we relate this to the real world and what

Just one more thing......yes, be sure the power slider is set to 100% in the WSJTX settings (as Hans addresses in the operating manual).? Check this first when you can't figure out why no one is

Not sure if I'm the Chris but... I was pointing out that the diodes mentioned needed to be Zeners, where they were positioned. What I don't understand is how people claim to be continually blowing

Cliff, Howard and Others: Congratulations Howard!!!!? Glad to see it is working for you. Cliff - you did a much better job of explaining this than I did.? Yes, you will get the dreaded message if

Lee, Not class E.? Its class D and MOSfets or Bipolar transistors can do that. Class-D requires a on state (saturated) that Mosfets do well.? ?Its not device speed as IRF510 is more than good

Tony, In LTSpice if you hover the cursor over a component as if to measure current through it, then press ALT and right click, LTSpice will give you a plot of instantaneous power. You can window that

Hans, For any dissipative non-reactive component, linear or not, the power being dissipated at any instant is V(across) x I(through), period. It's that simple. There are not many places for the