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<< THEN: The Raspberry Zero 2, that powers the zbitx (zero bitx because of? the RPI zero in it), can't handle this display as the GPIO pins on it are all used up. Hence, the zbitx sports a new

the base-emittter voltage of QD1 schould be about 0,7 V but is 3,9 V -2.3 V = 1.6 V, my guess: defect transistor or wrong measurement. Am 09.03.2025 um 17:02 schrieb WF4RC Carroll:

Hi Michael, AFAIK The schematic is correct. Double-check your tracing. Solder bridges on the board could also confuse the measurements. I use a magnified headset to verify traces. Since it is a

Evan, Is it possible that R5 and R6 are mislabeled on the schematic? After I removed Q9,Q10,Q101,R5 and R6, to check continuity of pads and traces, I found that bottom of R6 connects to the gate-pin1

CD29 could be leaking.? Without a mic connected, the voltage on the tip should be approximately 9.9/10th of the voltage supplied to the sBitx.? That assumes a 10meg input resistance on your meter.?

Thanks for the input and replies, There was no mic connected when I made the measurements. Can anyone verify/ confirm that the Tip of the TRS MIC plug should be at 5v? I suspect QD1 as well .? The

Thank you for the update, very much appreciated.? ?Doug

Even with a dynamic mic, QD1's operating point is incorrect. The emitter and base should have a difference of .6 to .7 volts. The listed voltages are 3.9 and 2.3 volts or 1.6 volts. The transistor is

I just updated mine, and I had to use a new board. I have a programmer, and I was able to load the OG nano that came with the 6.1, but you have to be able to program via the 6 pin (which you have to

Exactly. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton -

It is possible he’s trying a dynamic microphone

Bad mic. Is drawing the bias provided by RD21 down from 11.9v to 2.1V. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch –

Yeah, tell us everything about the microphone!!!

I have a new sBitxV3 board only. Everything is working except the Mic input. I started experimenting with some microphone I had and the recorded transmission has lots of noise and very low audio. I

He could offset the carrier a bit one way or the other, (maybe by 1500 Hz ?) and then plot the response of the filter by looking at the noise pattern on any waterfall display It would be a great

Hi Ted, Since you have the Memory Manager software, I suggest you save the values to a file and do the BFO adjustment again. I thought about the symptoms again and do not believe the modulator

Thank you Ashar! Thanks for all your hard work making our hobby fun, innovative, and affordable! Truly state of the art! Doing what no one else has done! I appreciate it greatly! Jay

Hi, Evan, and all. I appreciate the leads.? Here are some answers to your queries - See attached;? SSB is set tp 11.056875. That would have been a really good call, though I'm not against trying

Ashhar, Thank you for all the time you have put into the ZBitx. Hopefully, after this weekend you’ll get a much needed break Thank You again, Robert AG6LK

Wow, that sounds like it was a puzzle to figure out.