what's the difference between the LNBs 0.2dB vs 0.1dB

By: Guest
Date: Thu-Jun-4-2009-
Response
2
You cannot compare two lnbs in that way easily. The noise figures they are quoting are usually the lowest noise at one particular frequency - you really need to ask them the average noise figure across all frequencies which is far more relevant.

Also when you start talking about noise figures that low you really need to match lnbs to the dish - the lower noise one may well perform better than the other on one dish but on a different dish tht may be the opposite way round.

In average usage on most satellites you will find no difference between them you only need to start worrying about it when you are trying to get the weakest channels on obscure satellites and even then the lower noise one may not be the most sensitive. What satellites are you aiming to use it on?

[d] By: Guest
Date: Thu-Jun-4-2009
Response
1
Hello

I have a Cambridge Universal LNB which is about 10 years old and rated at 0.8db noise level. I swapped it for a modern MTI 0.2 twin LNB rated at 0.2db last year. The aging metal canned heavy weight Cambridge LNB was much more sensitive than the cheap light weight MTI by miles. I don't think the stated noise levels on modern LNBs really mean anything.

Cya.

[d] By: Guest
Date: Thu-Jun-4-2009
Response
2
I would not worry about noise figure in general as long as it is reasonably low, say 1dB or less. The noise figure will vary across the band anyway and it is more important to have it consistently low rather than say 0.1dB at one frequency, 1dB at another and 1.5dB at another etc.

In the old analogue days I had an 80cm dish on Eutelsat 2F1 at 13 deg E and was getting sparklies on Viva 1 and 2. I had a 1.2dB NF Nortel LNB. I changed it to 0.6dB Cambridge and the results were worse on these channels and certainly there was no improvement on any other channel.

Manufacturers will try to sell LNBs on noise figure but it is better to look at reputation and other people's experiences. In places where extreme fringe reception is being attempted, then there may be difference between LNBs but you would need to look at NF response across the band, or practical results before selecting a particular type.

[d] By: Guest
Date: Thu-Jun-4-2009
Response
1
In a nutshell, 0.1=0.2=0.3, etc, etc

It's just a label

All LNBs out in the last 1-2 years are basically the same

[d] By: Guest
Date: Thu-Jun-4-2009
Response
What is 1 + 100

Just Updated::