Thanks for the info.
Seems G15 is running reverse polarity for that slot. It is supposed to be odds on vertical. May be playing havoc with small dish FTA on adjacent sats.
I'm not sure which slot you're talking about relative to being odds on vertical? G15 is an odds on horizontal, and the old G27 slot is also, as is the Anik F3 slot mentioned above.
However, as I'm mentioned in previous posts, I'm really unsure about just what affect polarity would have with respect to interferrence. These sats pretty much repeat all the same frequencies on both H and V freqs, except for the 4 MHz bands that separate each transponder. So polarity be any different for most low SR signals. Polarity WOULD affect high SR signals and analog signals though, because the 4 MHz gaps would fall right on the center of a broad full transponder signal, so it is really unclear to me just what affect this might have. As I mentioned before, it almost seems like it might be like removing the carrier to produce a SSB transmission, but in any event, I think there would be interferrence no matter whether G-15 were drifting into a slot with the same or opposite polarity plan.
But this whole topic of H on odd vs V on odd slots reminds me of when they switched from 3 deg spacing to 2 deg spacing. Things just didn't line up properly for quite a while, and still aren't quite settled, as it seems like there are a couple slots with the wrong polarity, and then at the eastern side of the arc, even the slots don't seem correct, as AMC-6 is in an even longitude, whereas the rest of the CONUS C-band arc is on ODD longitudes.
I decided to make an Excel chart of Sat/degrees/odd polarity/even polarity, just to see just how well they line up, and it actually turned out better than I thought it would. Seems like the main problem is that polarity plans seem to reverse around the Anik-F3/SatMex5 area for some reason... probably dating back to the old switchover between 2 and 3 deg spacing. Polarity plans relative to odd/even polarities haven't really been firm on Ku, since there have been very odd transponder plans, with double wide transponders, which would basically mean that you had two transponders side by side with the same polarity. So this is really only an issue with C-band, which has always had consistent 36 MHz wide transponders with 4 MHz gaps.
Anyway, just in case anyone is interested, I tried to copy over the quick spreadsheet I put together, however as you see the columns don't line up as usual, but it's almost readable. I just listed C-band sats.
Sat.....Lon....ODD.....EVEN
AMC-6 72 V H
73
KU-only 74
empty 75
76
empty 77
78
KU-only 79
80
empty 81 ?V ?H
82
AMC-9 83 H V
84
KU-only 85 ?V ?H
86
AMC-3 87 H V
88
G-28 89 V H
90
G-17 91 H V
92
G-25 93 V H
94
G-3C 95 H V
96
G-19 97 V H
98
G-16 99 H V
100
SES-1 101 V H
102
AMC-1 103 H V
104
AMC-18 105 V H
106
A-F1R 107 H V
108
empty 109 ?V ?H
110
A-F2 111 H V
112
SM-6 113 V H
114
empty 115 ?H ?V
116
SM5 117 V H
118
A-F3 119 H V
120
G-23 121 H V
122
G-18 123 V H
124
G-14 125 H V
126
G-13 127 V H
128
old G27 129 H V
130
AMC-11 131 V H
132
G-12 133 H V
134
AMC-10 135 V H
136
AMC-7 137 H V
138
AMC-8 139 V H
All Satguys members need one of those 
