FINALLY got the Black Ultra and set it up. After a little adjusting the SNR went up from what was originally 43% to 52%, then after a little more tinkering to try to squeeze a little more out of it the best I could get was in the low 40's! I gave up after a couple of hours of messing around. That'll teach me to be greedy!
1. Borrow/steal/buy/hire a proper sat-meter. Connect to LNB. Set to 10773H (BBC mux)
2. Loosen mounting bolts a little. Adjust azimuth (direction around vertical) to maximise signal strength. Tighten mounting bolts well.
3. Loosen elevation bolts. Adjust elevation, tighten screws, measure, move slightly, repeat, until signal stgrength is optimal. Tighten elevation bolts.
4. Loosen LNB, fiddle with in/out (if possible) until max strength.
5. Finally, adjust skew to maximise Signal/Noise or Carrier/Noise ratio (whichever your particular meter shows).
6. Tighten LNB screws.
The mount on my Triax 90 doesn't seem to be designed too well, tightening the elevation actually changes the elevation of the dish slightly so it's a bit of a guessing game. This, along with the fact that reports suggest that a 90 won't give much of a weather margin, is making me bite the bullet and invest in a new dish. Favourite at the moment is a Raven (is that Channel Master?) 120. I've also been looking at the Gibertini 125/150 but with the weather we have here and the fact that I'm very close to the sea I'm thinking that the added rigidity and robustness of the Raven would probably give it the edge. I don't think I'm quite ready to go to the CM180 like
@st1 has though (the price of that is A LOT of NetFlix!) so it looks like my options are the CM120 or the Gibi 125/150.
Decisions decisions!
Channel Master == Raven == ASC == Skyware. (See pics below for lastest incarnation)
Same product, different owners at various times.
See if you can find a used one. New ones quite high priced.
The Gibbys are quite nice, though - works well, and better priced. Will last for many years (although not as many as the SMC dishes)
You are absolutely right about coastal weather and corrosion etc.; SMC dishes are good.
Alternative SMC dish is Cahors (formerly Visiosat) 120. Performs almost identical to Channel Master 120, at a lower price (EUR 189 at hm-sat-shop.de). Needs 2.5-3" pipe for mount.
I had a Visiosat 120 in the 2D days, but back then you really needed a 180 in Copenhagen to receive anything watchable, so I sold it.
Have to confess I like the CM120s better, but that's a matter of taste.
The CM180 delivers, but is high price, heavy, often require planning permission, annoys neighbours, use large pipes (4.5") and require VERY sturdy foundations. For practical reasons, you would probably be better off with a 120 (SMC or Gibby).