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Mine and other have reported the corner blocks are anodized aluminum. It was one of the first things I did.? If they had been plastic I'd have made up brass strips to connect across the corners.

I recall, and someone should confirm, that those screw blocks are made of plastic and that the 2 side panels are consequently not electrically connected to the rest of the box.

Hi Folks, ??????????? Yesterday I had some time to work on my sBitx, mounted a fuse holder, removed the DC power connector, ran heavy duty figure eight cable through fuse to main PCB, used

Allison this is for you and anyone else who wants to chime in. The changes to the transmitter driver section have been discussed and from what I gather the Q11.12.13 chain should be like the ubitx

Inter-process communications (IPC). There are several ways to do it in Unix. I don’t have experience with it, but time to learn! :-) Something to consider is that the lightweight process reading the

Allison, I pulled Q10, the 2n7000, and the SMD 2n7002.? Both tested bad as 200ohm resistors SD.? Q9 tested good. Now to try to work out what could have caused them to fail. 73 Evan AC9TU

Allison I wasn't commenting on speed. If you spawn a thread to handle an event you may still have to communicate the result from that thread back to the main process. You could, of course, spawn

uBitx band filtering is bi-directional and the same in both directions (RX/TX). The usual noise blanker (Lamb) samples RF/noise from the antenna and if Pulse in nature it operates a FAST RF switch to

The process chain is in the very core of the kernel and as such highly tuned for speed. Its not all turtles as if priotitized (see NICE)? but you have finite CPU (granted not at all a slug) and many

Evan, Mine has that 2n7000 on the bottom, I believe it bridges the SMT part, The power sequencing is not greatly helped by the software mod as that is only useful when the radio software is running.?

Charudatt, Thanks for the suggestions! Will make give that a try. The rotary code in KD8CEC is not as isolated as I would like. So I have been hesitant to tackle it until I have plenty of quiet time.

David, The filters switched in the uBitx are low-pass filters (LPF).? They reduce any signal above the desired frequency, like unwanted harmonics generated by the transmitter.? Most AM interference

I removed the finals. One tests OK the other shows a dead short amongst all the pins. With the final removed I measure 0.45 volts on the gate of Q10 - I presume this is a low. The input current

The TX button and \t command do not appear to put the sBitx in transmit when in LSB mode. They do seem to work in DIGITAL mode. I was trying to use them with ?mic that did not have PTT.

? Was wondering: My understanding of the Ubitx is that the more specific band filtering occurrs in transmit ent and disabled in receive. This is suppose to be for conserving power consumption when

Thank you, Allison.? I think I understood that feedback oscillations could be causing the board failures.? I did not have an issue before making the board mods.? I did afterward.? I chalked it up

Does pin 36 from the PI not extend down to the main board? In other words, the trace for pin 36 does not get connected to the main board already so we have to tac the wire directly to were pin 36 from

Evan, The sequencing mod is for control output of the Rpi so if the pi is not up it has no effect. What I believe is going on is the power amp chain on first power experiences momentary feedback, high

Lou, That measurement is independent of the finals being there. Allison ------------------ Please use the forum, offline and private will go to bit bucket.

For reference, I am having similar issues after doing the PA sequencing and Buck regulator mods.? I did the mods, powered up the radio to update the software, and had my power supply shut down.? I