What do you guys make of this? I've mentioned this issue before, in various threads. Basically there's like a narrow swath of roughly 15-20 degrees Azimuth where WKBW (UHF 38) will degrade below 15 dB C/N and lose lock. Not a big deal, since I can just rotate out of it. But, of course it just so happens that like for half of that is where CBLT and CHCH are optimal. Rotate the other way, and u'll lose one or the other. I'd say 90% of the time ya can find a sweet spot where everybody's happy.
Couple Spectrum Analyser screenshots of WKBW when it's degraded, and another when it's not. See how it loses that familiar flat ATSC "mask", degrading to an upward slope, and the pilot sinks below the upper end of the spectrum?
Flattens right up once rotated to restore C/N. The adjacent signal is WIVB (UHF 39)obviously. Sidenote, WKBW and WIVB XMTRs are nearly co-located, a mile or two apart, on the same hill.
What do ya think that is?
I'm inclined to think multipath, since it's a relatively narrow swath where it degrades.
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