Replacing feedhorn

[tesla]

Hi guys,

i have a dish with circular feedhorn and a quattro LNB for Ku band. The front side of the feedhorn has a plastic film. This film got broken, insects started getting into the waveguide (ruining the signal) and i decided to replace the feedhorn.

The problem is that the diameter of the new feedhorn is smaller of the old one's. For that reason i can't mount the feedhorn. Any idea?

 

[Channel Hopper]

What's in the picture looks fine

Do you have a 'before' picture ?

 

[tesla]

This is the 'before' picture. I don't know how to mount the new feedhorn.

 

[wium]

Cant you place a plastic bottle top cover same size as feedhorn waveguide opening on the old lnb.What about putting tape or some rubber around the throat of the new lnb.

 

[Huevos]

Or just put a piece of expanded polystyrene in the throat.