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one of the 4:2:2 feeds is the same thing as the Limo channel so you're OK with that
I don't think I've ever seen either of the 4.2.2 feeds showing the same content as the LIMO channel. Every time I've tuned them in, all of those scpc channels were different. Are you sure you're not seeing the LIMO channel at 2 different freqs? Ie that first day when the NASA channels moved over to AMC3, they were moving the feeds around to different freqs, and if you scanned them in that day, you might have scanned in one of the 4.2.2 channels at a freq different from where it is now, and you might actually be picking up the LIMO on 2 different freqs, since one of the 4.2.2 channels has the same SR as the LIMO channel.
Just a thought, because I always thought that all 3 were different. I seem to remember the LIMO having sort of regular programming, while the 2 4.2.2 channels seem to cycle between different views of the launch area, usually with a buzzing data signal in the audio. Also, one of the 4.2.2 channels I think is where they typically put the radar views showing storms coming into the area. During launches, I'm typically jumping around between all 4 transponders, and don't remember duplication..... but my brain is getting less reliable (SS does that to you) so I may be remembering wrong. Right now, the LIMO has a slate up, and the 2 4.2.2 channels are different.