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I've been down this road a few times as a development engineer.? That means I have been burnt a few times and know to look. The box has a really good finish and its durable (powder coat) that makes

Evan, That only works in a RTOS or loop constructed non os.? This is linux and loops can be constructed but they are interupted by process timer and system priority levels.? The system can suspend

The reason assuming wired correctly the 510s failed is the same as the irfz24s, transmitter oscillation.? you may have a bad relay K9 or U3 failure as well. Allison ------------------ Please use the

Butch, U3 in combination is to both switch the antenna to the recieve path AND isolate the transmitter output from the receiver during transmit. IF either is not there or not working right you either

Hi John, If it were me, I would get another microSD card, download the image from Ashhar Farhan's web page and see if that works.? It could be that the code specific to the RPi4 is corrupted, and the

You need to configure the wm8731 and the snd-aloop for sbitx to work on a fresh install. Follow the instructions in install.txt

Hi John, I haven't posted anything on your issue recently because I’m just out of ideas. A new SD card with a new OS on it would have been my suggestion, which you’ve done. The issue you’re

I have built both versions of the S-meter ?- my uBITX currently has the second Nano version fitted, but I also made the option using the LM-358 chip. Both work although you do need to add the

Evan: Sorry, I reply to the other message instead of this one. Thank you for the information and clarification. This and the following one were both beneficial. 73 Dave WD8AJQ Sent from my iPhoneSE

Ashhar, I hate to ask stupid questions but now that I think I understand what U3 is doing, why is it there at all ? simply connecting the RX relay side if C14 to the U3 pin 3 side of C4 and removing

Evan: Thank You for the info and clarification. 73 Dave WD8AJQ Sent from my iPhoneSE

Ashhar, No I have not tried putting the antenna directly to c94 yet. Today my radio is receiving static and noise even on dummy load. Intermittent problems are so hard to troubleshoot

Ashhar, I was just reading the specs on U3. It says in the specs, The break?before?make select circuitry prevents disruption of signals on the B Port due to both switches temporarily being enabled

Have you tried connecting the antenna directly to c94?

Ashhar, My unit ch0128 goes from working normally to not receiving any signals to red to yellow on the waterfall even when on a dummy load.? It still receives stronger signals when its yellow.

Shout out to K3NG (and thanks for your efforts) just to let you know that your sbitx code also gets stuck when the process is trying to start up. Again this is with the original RPi 4 and a new

Unwind one turn from the PA secondary like Allison has recommended. I would also reduce the 10 ohms (two paralleled 22 ohm resistors) to 47 ohms by snipping off the resistor leads from one side and

I tried the 510 but they went bad very quick. What changes would you recomend if using 510 in place of the irfz24?

At these power levels, the IRF510 gain will be much better as it has half the internal capacitance of the IRFZ24N

I did not modify t5. Looking into other designs, they use broadband transformer on the input. Later will try it.