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Michael, The TX signal works (recieve at 0.15 volts, transmit at 3 volts). The pins on Q9 are marked in this photo: The gate (pin 1) of Q9 should be higher, and the tab (Pin 2 or drain) should be 0

Hi Michael, I had a typo on my last post.? I deleted it and provided the correct value for the TX signal of 0.06 and 3.3 volts. The way the TR switch works to supply power to the drivers is as

So on Q10 Pin3 has 8v pin1 .15v pin2 0 Q9 has 8v on pin1 and 12v on pins 2&3. This is in the receive state. The only change when in Tx is the voltage on Q10 pin3 increases from .15 to about 3v. Q101

I tried one of the voltage converter/regulators posted earlier. Not a speck of noise.? It's staying.

Thanks W0ZF!? ?I'm just a beginner. tonight I tested the "winkeyer-repurposed-as-a-rotator-controller-wannabe"? with rotctl (interative) and it worked perfectly.? ?I have limited ability to

You might want to look into the biasing circuit for every single stage. Because when you change the circuit voltage, the biasing calculations may be different. Gordon kx4z

" The circuitry is optimized to work between 6v and 9v. At 12v, the heat from the 5v regulator will be significant." Is that the only reason not to put the Zbitx at 12v? Can the rest of the machine

Following your progress with interest! I built a K3NG controller a couple years ago (azimuth only) and had good results tracking linear birds. Lacking an elevation rotor, I just mounted the antennas

Hooray!? ?I figured out what was causing those "communications errors' that were causing the disconnects. Using interactive version rotctl (not daemon rotctld) I tested changing to Yaesu 232B

It looks as if I have pulled up the pcb trace to one of the Q101 pads. I'll try to repair that and put in a new 2n2219. Surface mount components have always presented a challenge for me

Scratch that , the drain of Q101 isn't grounded. I'm sure I'm in the neighborhood

The gate of Q101 doesn't seem to be grounded. This might explain it...

So, I don't believe that Q9 is switching, I have .6v on the gate and 12v on drain and source. PTT doesn't change anything.

I can't say anything about the zBitx, but HF Signals did just inform me that sbitx v4 would available the end of March

I appreciate it. I don't have problems with the smaller isolated circuits. I haven't really jumped into anything beyond basic diagnostics for a few years and just recently reaquirrred proper test

The radio above (prior post and profile pic) is a Version 5 but has a Nextion 2.5" screen.? I just tested it as it happens to be opened up. The supply is at 15.8V going into this resistor and and the

Is there a timeline for resuming the zBitx sales and when the v4 will be available?

Michael, I've added more instructions to the spreadsheet. To test D6, the PTT must be pressed, and the tab of Q9 at the line in voltage (12 volts in the spreadsheet case). If the banded side of D6

D6 is only 600mv.

If you adjust the PABIAS1 pot, you must return it to the full counterclockwise position until the TR switching is working.? This will protect the IRF510 finals from burning out.? I only adjust the