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Hold the press! I was not checking the high bands. I see the oscillation on the 10m band. Back to investigating...

Hmm. I have now restored my radio to the point where it's working (mostly; sometimes display freezes get me) and I don't see the oscillation when transmitting in SSB mode. I am running commit

Compiling now. I did find the calls in setupSWR() that would have messed with the BPF and comment them out. Just tried it. It oscillates :(. - Jerry

Interesting… Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa Grand Piton - J68HZ

Jerry, please try the latest commit I just pushed to GitHub. I removed a call to setupSWR() that I am concerned might have messed with the registers: https://github.com/KI3P/SDTVer066-9

I think this is the commit of a version that has no oscillation if you want to do some git diff'ing: 22385bc73b1046f1b095800e5b5009398fb4d57f My screen freezes seem to be happening less often for some

*** That's mostly a hardware thing. When you read the register, do you get what you wrote or the current non-driven state of the pins? - Jerry, KF6VB

Ni idea... I didn't write a line of that code... Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner

*** Couldn't find that string anywhere in the code. Are these port expanders structured so you can read what you wrote? - Jerry, KF6VB

No Bad assumption, there is also a "SETBIT" function... Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

Looking at Ver66-09, I have changed the calls to setBPFPath() so they are the same regardless of CW/SSB mode. No difference, still oscillates :(. Of course, it's still possible for code somewhere else

No problem… Jerry just confirmed it’s a software bug that got in between version 50.0 and 66.9. I’ll let the software gurus figger out where the bug is. There are plenty of ya here in the forum

I just downgraded to V50.0. No oscillation. So it is a software problem. "Ver 063-1-beta" - oscillates. "Ver 066-7-SWR" from 3/5/2025 - oscillates "Ver 065" from 2/20/2025 - oscillates "Ver053" - does

Thanks Bill -- I'll build it from the parts.

I can't help because my system's been down for over a month and I haven't been able to do anything with the software. Jack, W8TEE

My testing indicates this is the problem area. I removed C18 and the problem went away. Obviously, as Bill indicated, this is not a fix. I think that the state of the switches (U1, U8, U3, U7) in SSB

Ok if I just send you the board and parts to build your own? That will save me some time and its very easy to build. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ

Its not a hardware problem. The radio has been working fine until recently when some software mods were made. Use some sound deductive reasoning here. This problem did not exist a month ago with any

So I think what you are saying is that either: 1. TX_BFP_SEL is on (=1) and RX_BPF_SEL is off (=0) for TX …OR 2. TX_BFP_SEL is off (=0) and RX_BPF_SEL is on (=1) for RX. I wonder how/why that got

Oliver, I was having some kind of feedback/oscillation problems a couple of weeks ago and traced it back to the T/R switch also. The relays and associated parts all checked out but, when I removed the