TLDR: Looking for a new FTA receiver with RCA outputs.
Well considering I got a mandatory week off due to Covid and I've been feeling mostly better the last couple days, I've had time to tinker with the dish.
I got my LNBF from Titanium yesterday. To remove my existing scalar would be a large undertaking. It was so close so I just sanded the paint off the LNBF tube to fit into my scalar. Vertical came in great, but horizontal would not scan. I made sure everything was spot on. So to rule out dish alignment, I remounted it 90 degrees out. Vertical (horizontal channels) now came in great, and vice versa. I checked the voltage coming from the Geosat both ways and it was good.
I checked for voltage drop in all places, splitters, connectors, cables. Turns out the Geosat puts out the correct voltage, but not enough oomph. To run the 13/18v switch, the 18v drops enough to not even solidly run the switch, and that's where my pixellation was coming from. To bypass the switch and directly run the LNBF, it drops to like 16 or so. Enough for the LNBF to know it's not for the vertical, but not enough to actually run the horizontal. The 13v barely drops so vertical isn't affected.
I tried running the horizontal alone, while bridging power from my GI receiver, and that made the horizontal run great. Unfortunately I don't have a 13V output on it, both the C and Ku are 18V. That's my normal setup, the FTA has all the C on H, and all the Ku on V. The 13/18V output switches the direction of the signal path. Each way has a voltage block coupler after the switch, then out to the LNB thru a splitter that draws the needed 18V from the GI receiver. The GI box also changes the polarity with the servo motor. The LNBF is nice in a way, not having to mess with polarity, but I lose the ability to tweak the skew from my living room, that's come in handy many times.
I grabbed this Freesat V7 Max from the basement, that I had bought years ago as a spare. It controls the LNBF great. I really like the interface, but it does have some glitches, like initial startup on PAL, and some satellites it will hang so you can't get the channels. Like NASA and FOX.

But I did get some channels I had been unable to get for a long time, like Decades. Must just have been the low voltage issue.
Today I decided to try it with the original feedhorn assembly. Sure enough, the original works great now. No interference. So I must not have 5G out here, or enough to make a difference. And if I do get it, the LNBF will come in handy for testing and all.
The Geosat has been running on fumes for a long time. First it wouldn't hold memory if the power went out, solved with the UPS I bought when I got internet out here. Then the L/R sound outputs went out so I use the coaxial with a converter. Now it's the 18V output going weak.
So it looks like I am looking for a new FTA receiver with RCA outputs. Since I love my vintage big screen 4:3 TV and all. I hear good things about the Mio. Which I would get if there's a proper HDMI converter, but everything I've read about is hit and miss. I also don't want everything to have black bars and burn in my screen. Right now most things show in 4:3. I actually quite like the Geosat. Or even the Freesat if the scanning bugs were fixed. Anything better out there?