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Hi Gyula, You are spot on.? I went down a rabbit hole and thought I was lost.? The act of typing to the group and reading everyone's response helped me reconsider and get back on track. I now have

Great work Guys, both of you! OK, I bet an AMP of that was the rest of the radio, so you're probably down to 7A total (3.5 per MOSFET) Crucial question then becomes: WHAT WAS THE POWER SUPPLY

OK.? ?I have it mostly or all fixed.? ?I went around in a zillion circles, of course. What I found was that in lines 1359 and 1369 else if (!strcmp(cmd, "tx")){ if (!strcmp(value,

Hi Gary: Yes, I worked on it one evening, gave up and went to bed, and tried again the next day. Nada... To all who have tried to help, your efforts on my behalf are sincerely appreciated. It appears

Hi Jack, There's a lot of regulators on that design!? The first one to check is the one associated with microcontroller / power button.? That is U5 a 3.3V LM1117 per the schematic.? I didn't figure

Thanks Gordon and Gary. The 2N2219a drivers get hot enough to burn a finger so I added their own heat sinks, but that’s only a fraction of the total energy so each final may be dissipating over 30

Gordon, I read as total radio current draw = 8.2A, not the current to just the output amplifier FETs. Need to know the FET current.? Otherwise, it leads to a very pessimistic calculation as you have

Greg, Did you get the plateau in the BFO adjustment step?

I think I figured out how Ashhar did it.? ?Will find out shortly if I'm right. Gordon KX4Z

Hi Evan, I appreciate the suggestion. That's the first process I tried to follow first.? It looks like the increment jumps by a value of 1750 for each "click" of the dial.? I've scanned the range of

Good morning, I’ve just ordered an sBitx v2 board ( without case, rPi4 and screen ) as I was hoping to design a case with space for internal batteries and/or manual ATU. As the design is open, I

*Excellent work, Jack.? ?Thank you for doing this.* The IRFZ24N datasheet from Infineon indicates a thermal resistance from junction to case of 3.3 degrees C/watt? This is a MAXIMUM value; perhaps

very interesting guys.

This is a plot of the sBitx IRFZ24N PA finals and heat sink at about 30 watts to a dummy load, continuous CW for about 500 seconds. The key was down for 300 seconds, after which it was unseated and on

To all, times as a hint. If you want to order a sbitx v2, you might want to read the technical description of the sbitx v1. There is a lot of duper explained there. For example the 25khz limit. I'm

An alle, mal als Hinweis. Wenn Sie ein sbitx v2 bestellen m?chten, lesen Sie vielleicht die technische Beschreibung des sbitx v1. Dort wird viel Duper erkl?rt. Zum Beispiel die 25-kHz-Grenze. Ich

This is probably the case with others. Until you need to fix or adjust something yourself, you can read about these things. You feel that yes, it is useful and I will save it. When it is needed, the

Hi Greg, With the original software, you can follow this video by Ashhar Farhan: https://www.youtube.com/watch?v=t6LGXhS4_O8 You need to do all three major steps: 1 - Adjust the BFO to pass the

Aaron, If you can not calibrate the touch screen, there is a hardware issue with the screen or the connection to the Nano.? Remove and visually inspect all the Nano pins and the traces to the screen

Things I would like to see: Audio peaking filter for CW Tune button temporarily sets mode CW and drive low for antenna tuning Row of buttons for quick tuning step selection Drop screen tuning circle