One more question please. Will this LNB bolt directly on to the existing feed horn? Is this the best option in terms of a feed horn/LNB for this dish?
Thanks
Inverto Black Pro C120 Flange Quad LNB - Satellite TV Shop UK
The prodelin feedhorns have a (proprietary?) 6-hole arrangement (60 degrees between neighbouring holes) of the bolt-holes holding the feedhorn to the LNB.
The Invertos have a C120 interface, which has an 8-hole arrangement (45 degrees). This is common with most consumer Ku-band LNBs w. no built-in feed-horn.
So none of them will fit the Prodelin feed-horn out-of-the-box.
With some care, however, you can drill new holes in the flange of the feedhorn for four of the C120-holes. Just be very careful that the centre of the feedhorn will be aligned with the centre of the LNB.
But the 1251 is a 0.6 f/D dish, so you can use pretty much any "universal LNB" with built-in feedhorn, as these almost all are made to match a 0.6 f/D reflector. No need for drilling.
You can even use a "normal" Channel Master feedhorn, which is a C120 for 0.6 f/D.
(There are also Channel Masters for 0.8 f/D dishes, but these are not the cheapest ones.)
But you will need to adapt the LNB holder somewhat, as this is made for the Prodelin horn with an Rx/Tx radio attached.