Re: Where is the focal point of an LNB?


KENT BRITAIN
 

Neil, I 101% agree with you.  I have NEVER found to focus to be at the calculated point!
The vast majority of the time gain improves when the feed is a bit closer to the dish.
Test if you can!   Kent G8EMY/W5

On Thursday, April 1, 2021, 8:25:54 AM CDT, Neil Smith G4DBN <neil@...> wrote:


With unknown dishes, I don't trust the current location of the feedpoint, I make a temporary bracket which can slide along the LNB axis and use sun noise to find the optimal position, verify using a longish optical path, then measure the position and make a permanent clamp with a couple of cm adjustment.

Neil G4DBN


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