Originally Posted by Frisbee78  Robbo, are you sure I need narrow feedhorns for 23.5 and 19.2 when fitted to a TD88? If so, then I guess the same applies to 28.2 which is only 0.5 deg further appart than 23.5 and 19.2 are. In that case, I guess the only option would be Alp quad LNBs.
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No, I'm not sure, I was guessing that it wouldn't fit due to the closeness, i.e just over 4 degrees. 3 degrees isn't possible. As for 28.2E and 23.5E, I was thinking that you might just get away with it, as 28E could be a little bit out and still work OK.
The narrow feedhorn LNBs would ensure that you did have room.
It is also possible to calculate the distance between the LNBs centres if you wanted to using some trig:
1. If you measure the distance between the LNB and the centre of the dish (call it d)
2. Say the azimuth between the two sats is 'theta'
3 Say the distance between the LNBs is 'x'
then x= d * Tan(theta)
I think on my TD110 I would just get 19.2 and 23.5,but it depends how wide the feedhorn is.
To set the dish up, you would position the dish using the signal from the central LNB, once that was spot on, you'd tackle the others. Remember the LNBs go on the opposite side, because the signal is reflected, also for lower elevations the LNB goes higher and vice versa.
When I set mine up ( I have no bracket, just using pieces of scrap), I calculated the positions first, then put them there, and then ducked down below the dish and adjusted for best signal.
