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Satgear.co.uk do a 40cm dish, you get an LNB with it, not sure if
you can get the dish alone. Gibertini 60cm dishes from Hisat are
always good. Illuminating a Sky oval 60 x 45 dish isn't quite as
easy a normal offset, but they are very cheap. 40cm is going to
get you around 30 dBi, a 60cm around 34 dBi. A smaller dish that
you can use when it is windy is going to outperform a big one that
you can't get up in the clear.
My 95cm dish is scary at 13 metres on a breezy day, but probably
gets me 37 dBi.
40cm is getting close to the lower limit at 10 GHz, but
diffraction losses won't be noticeable at that diameter.
On 11/03/2021 14:48, Colin Ranson
Now that the 3cm transverters will soon be
available, and many thanks to Neil for his hard work, I guess
we will all have to start thinking antennas. Some of us will
no doubt already be there, but I have to start thinking of
options. I intend to start small, with a 125mW
amplifier/LNA/relays in a plastic box under the feed horn
support arm with the transverter in the loft/shack. And also
by small I mean the dish – how rare are 40cm round offset
dishes it seems ? and how much gain can I expect from a 40cm
dish alone ? The ones I’ve seen are hugely expensive. The
feed is still under consideration as is a standard Zone one
elliptical. I really need to keep it small as there is already
a Sky dish on the building as well as a QO-100 1m dish round
the other side. I am hoping it will share a bit of space under
my 9cm QLY.
Thoughts appreciated please.
73’s and thanks
Colin de G8LBS.