vishvish said:Qb . Noise will be more generated in prime dish than offset dish .where full illumination of prime dish not flown to focal feed point ? Specially edge of the dish as well as center of the dish? Is it right ?
quickboy said:Right for a mesh dish, As the feed looks down, it will be looking at the HOT earth which is a known emitter of various electromag waves,
But on a good solid dish, with a neat shape and efficient side-lob suppression , It wont make a difference, SInce the feed will look only at the dish and wont see the earth
Also A Solid prime focus dish is cheaper than a solid offset dish of he same size anyway.
amatan said:quickboy said:Right for a mesh dish, As the feed looks down, it will be looking at the HOT earth which is a known emitter of various electromag waves,
But on a good solid dish, with a neat shape and efficient side-lob suppression , It wont make a difference, SInce the feed will look only at the dish and wont see the earth
Also A Solid prime focus dish is cheaper than a solid offset dish of he same size anyway.
If Cband signal is being reflected from the dish, then how can earth noise below the dish can reach the feed if it matched properly with the dish?
vishvish said:EARTH THERMAL NOISE:- natural noise that is not related to system equipment. One thing to remember, the satellite dish itself receives random noise from the earth in addition to signals from space, this random noise is often called earth thermal noise.
quickboy said:vishvish said:Qb . Noise will be more generated in prime dish than offset dish .where full illumination of prime dish not flown to focal feed point ? Specially edge of the dish as well as center of the dish? Is it right ?
Right for a mesh dish, As the feed looks down, it will be looking at the HOT earth which is a known emitter of various electromag waves,
But on a good solid dish, with a neat shape and efficient side-lob suppression , It wont make a difference, SInce the feed will look only at the dish and wont see the earth
amatan said:If Cband signal is being reflected from the dish, then how can earth noise below the dish can reach the feed if it matched properly with the dish?
quickboy said:C-band signal is reflected from the dish, But for Ku you need smaller size of mesh, Well the dish definitely reflects most of the interference from outside,(Well otherwise you will find it difficult to catch anything on mesh dish, clearly), But then it is not designed to reflect every Electromagnetic signal anyway,That is why I say a solid dish is better. It is a comparison, between solid dish and mesh, A solid dish will surely give you better gain and less interference in comparison with a mesh dish of the same size and quality
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.