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No there isn't. I bought this device in the hopes it works :) https://www.aliexpress.com/item/1005006860598580.html [email protected]> wrote:

Is there a built-in charging circuit for the 18650 batteries in zBITX? This question was asked by one of my ham friends. I told him that I will post on this group and get back to him if I get a

It's kind of odd, but not really, if I were trying to diagnose something that I built myself, I would have no problem. I have no problem doing mods to commercial built equipment. But, yes, I would be

This is often due to rf getting into the control circuits. Are you using an unbalanced antenna? EFHW perhaps?

I agree about Heathkit. I miss the HW101 I had in the late '70s. I could almost draw parts of the schematic by memory. (Yes, I played/worked on it that often!) I stayed active in cw, ssb, rtty and

You're going to learn a lot in the process of this repair. Be certain to protect Q101 with a small resistor in its drain lead or you are likely to just repeat the whole performance all over

Old 2n7000 datasheet https://www.st.com/resource/en/datasheet/cd00005134.pdf 73 Evan AC9TU

Yes, 2n7000 and 2n7002 are the same devices in different packages. 73 Evan AC9Tu

Yes, I was somewhat relieved that I am getting the proper Tx signal. I feel that I may need to remove Q9, Q10, Q101 and check the continuity, rule out damaged pads/traces, and swap in new components.

Hi, folks! When I do a digital QSO with my uBITX v.6. it often stucks on TX and won't go back after PTT is released. To put it in Rx mode I have to unplug PTT/Data cable from MIC connector, put the

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