John, Thank you very much for the very thorough reply. Mostly (!) very encouraging, as I think this will save me a lot of thinking and worrying about ground loops in my RX audio and transformers and h

#ubitx #teensy #filters

Hey there, I'm looking to try making a DSP audio filter, for both transmit (e.g. compression) and receive (narrow, wide, notch filters) using a Teensy 3.2 and Teensy Audio Board. My plan for the recei

#ubitx #teensy #filters

Are there any controls or jacks that I should isolate from my metal chassis? Specifically, I'm thinking of the PTT and C/W key inputs, since those are wired to the Raduino. Since they are part of the

#ubitx

I'm looking to potentially add an audio DSP filter to my uBITX... I've got a Teensy 3.2 lying around that hasn't been used for anything, and I figured that 'd be the perfect toy to try out for this ap

#ubitx

For USB/LSB on the uBITX, what is a reasonable carrier suppression? (and how is that properly measured, i.e. I assume it's carrier relative to peak?) Background: I should have left well enough alone,

Thanks. Any thoughts on voltage rating for the capacitors, especially the "big" electrolytic ones? (10uF, 100uF, 470uF... I'm assuming they're electrolytics.) I looked at the Hycas schematic, and that

I'm looking at possibly lifting just the AGC circuit out of the JackAl design, and seeing if I can stock it out of my junk box. But... the only JFET's I have are MPF102, J201, 2N5486, and 2N4393... wi

Hey all, I'm planning on putting a couple of diodes in series with the positive line from the power connector, to bring down the voltage a tad. Just wanting to make sure I'm not missing something... I

#ubitx

Thanks... what exactly would I be looking for to check this? (Feel free to point me at a resource, I can read...) Is this something I'd need to desolder stuff for? I may go ahead and invest in another

#ubitx-help #ubitx #v5

Wow, you're right, that regulator does get pretty hot! I've got a TO-220 heatsink that I will bolt to that. That said, I would say that the heatsinks for the IRF510's has gotten at least as hot as the

#ubitx-help #ubitx #v5

I'm looking to use my uBITX on digital modes. So, on the one hand, I should probably just plug the inputs in and go... on the other hand, I've seen plenty of discussion about isolating the audio I/O v

#ubitx

All good questions! So, I don't have a power meter, but I do have a QRP Labs dummy load that has a diode for rudimentary RF power measurements with a voltmeter. I'll try with that, which will also hel

#ubitx-help #ubitx #v5

I've got a new uBITX v5. I've only been using it for CW so far (haven't gotten around to wiring up the mic yet), but I've noticed that, after calling CQ a half dozen times, the finals get way hot... t

#ubitx-help #ubitx #v5

Yeah, I thought about that, but from what I can tell, the stock pot is audio taper. I measure it at a few points w/ my multimeter and it seemed to fit a log profile.

#ubitx-help #ubitx

Super excited, just put together my uBITX and love it, though I haven't successfully managed any 2-way QSOs yet. I've got a few spots on RBN, so I know something's getting out... Anyway... I've notice

#ubitx-help #ubitx