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Thanks everyone for the discussion, much appreciated. I did find a typo in my measurements documentation. The base is 2.9 v not 3.9. That resolves the concern with QD1. Using a fluke 8062 to measure.

Farhan might I ask whi the pico and not just add a pc8575 or pc8574 i2c gpio expander into the mix if you need more gpio. I think the z2w over pico w is alot better and mre power performance.

sbitx is being praised while zbitx is being talked about. Those who have little knowledge of the knowledge of certain components believe that one day it will be able to do what the sbitx can do with

QD1 is toast, the base to emitter voltage is too high! Recheck and if you find Voltage between base-emitter is much more that say 0.7 volts then replace the transistor and you audio will be

Aaron, The radio works out of the box, have no doubts. However, you can tinker with it if you want to, but no one insists on it. The sbitx wouldnt be what it is without the contributions of so many

Great !!

Solution found. It was chiefly the BFO - and for all I know, I might have set it wrong in the first place 2-3 years ago when I swapped out the board, and never knew.?? I took the advice on the

From what I understood the email from Farhan was explaining that in the future should there be any need to update the firmware to the raspberry pico that to avoid issues with end users needed to

I'm confused with all this. When I open the package, install the batteries I want it to work. I'm not interested in jumping through a bunch of hoops like the DX FT-8. Please don't ship until it

Pierre, As Farhan said: The Pico is updated by the RPi Zero 2W, the user doesn't get involved beyond attaching a USB cable from one device to the other (that's how I understand it) Ken, N2VIP

There appear to be one or more measurement errors here. The bulk of the measurement suggest that the transistor is indeed within its linear range despite the unexplained base emitter voltage. So I

The zbitx main board has a Pi Zero 2W and the front panel has the pico W. The pico2W didnt work with the display, nor did we need it to work the front panel. wrote:

the mystery continues. removed : CD28 LD6 CD29 CD27 QD1 Still have 2.1v at junction of LD6 / CD29 [both removed].? With power off measuring about 2K to ground at that point. Going to tke a break and

<< 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