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Re: sBitx Issue After Upgrade #sBitx


 

If you remember, I had reported self oscillations in the PA for a few microseconds at TX to RX and RX to TX transitions the PA as well as T/R switch are both switch on, creating a feedback loop. This was causing harmful self oscillations.
The way to break this was to break the feedbacks loop, we are switching off the LPFs during the transitions. In the previous commit, I had skippee turning on the LPFs. This didn't matter in the v2 where the tr switch is connected on the antenna side of the LPFs, the DE's tr switch is on the PA side of the LPFs.
To see what has changed between two updates, you can first list the commits with "git log", and then try "git diff check1 check2" where check1 and check2 are the first few letters of the checksums of the commits listed by git log.
- f

On Wed, Jun 14, 2023, 3:35 PM Scott KE8KYP <scott_massey@...> wrote:
Hi Ashhar,

That worked.? The radio changes between transmit and receive properly.? Thank you.

Where was the problem?? Something controlled by CAT?? Just curious.

Thanks again, Scott

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