Feed horn for LNB
Feb 12th 2011, 5:15 pm
#1
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Thread Starter
Joined: Jul 2010
Posts: 105
Feed horn for LNB
I asked this on another forum so forgive me if you're seeing it twice. I have an Invacom dual LNB on a PF 1.8 meter dish. What's the best feed horn size to use? I'm in the north CB area.
Tim
Tim
Feb 12th 2011, 5:23 pm
#2
Was called something else
Joined: Jul 2007
Location: Gandia, Valencia
Posts: 1,935
Re: Feed horn for LNB
What feedhorn (and make of dish!) have you got at the moment????
Usually the one that comes with the dish / LNB kit is the one to use, unless the installer is totally incompetant! Why do you want to change??
Depends on you make of dish, as there are two types of c120 feedhorns..a big one and a small one!
I use big one on famaval 1.8m and 2.4m dishes, and the smaller on on the other make of portuguese 1.8m dish. Sometimes you can use an invacom adjustable feedhorn as well for the 2.4s.
Adjustable
There is also a completely different feedhorn for the "bulgarian" dishes....but these can be adapted to use the horns above.
But what is more critical is the distance from the dish of the feedhorn...it is critical, and is differnet for different makes and sizes of dishes, and the skew / rotation angle of the LNB.
A change in feedhorn can make a difference in reception, but it does not work miracles....as reception is a combination of LNB, feedhorn, location, dish site, cable type, cable run, receiever, local topography, local interferance, dish alignment, LNB distance, LNB skew...and a few other things....
Usually the one that comes with the dish / LNB kit is the one to use, unless the installer is totally incompetant! Why do you want to change??
Depends on you make of dish, as there are two types of c120 feedhorns..a big one and a small one!
I use big one on famaval 1.8m and 2.4m dishes, and the smaller on on the other make of portuguese 1.8m dish. Sometimes you can use an invacom adjustable feedhorn as well for the 2.4s.
Adjustable
There is also a completely different feedhorn for the "bulgarian" dishes....but these can be adapted to use the horns above.
But what is more critical is the distance from the dish of the feedhorn...it is critical, and is differnet for different makes and sizes of dishes, and the skew / rotation angle of the LNB.
A change in feedhorn can make a difference in reception, but it does not work miracles....as reception is a combination of LNB, feedhorn, location, dish site, cable type, cable run, receiever, local topography, local interferance, dish alignment, LNB distance, LNB skew...and a few other things....
Last edited by The Guy; Feb 12th 2011 at 5:42 pm.
Feb 12th 2011, 8:59 pm
#3
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Joined: Jun 2005
Location: Puente Esuri
Posts: 6,903
Re: Feed horn for LNB
What feedhorn (and make of dish!) have you got at the moment????
Usually the one that comes with the dish / LNB kit is the one to use, unless the installer is totally incompetant! Why do you want to change??
Depends on you make of dish, as there are two types of c120 feedhorns..a big one and a small one!
http://satandpcguy.com/Site/Resources/feedhornlarge.jpg
http://satandpcguy.com/Site/Resources/feedhornsmall.jpg
I use big one on famaval 1.8m and 2.4m dishes, and the smaller on on the other make of portuguese 1.8m dish. Sometimes you can use an invacom adjustable feedhorn as well for the 2.4s.
Adjustable
http://satandpcguy.com/Site/Resource...adjustable.png
There is also a completely different feedhorn for the "bulgarian" dishes....but these can be adapted to use the horns above.
But what is more critical is the distance from the dish of the feedhorn...it is critical, and is differnet for different makes and sizes of dishes, and the skew / rotation angle of the LNB.
A change in feedhorn can make a difference in reception, but it does not work miracles....as reception is a combination of LNB, feedhorn, location, dish site, cable type, cable run, receiever, local topography, local interferance, dish alignment, LNB distance, LNB skew...and a few other things....
Usually the one that comes with the dish / LNB kit is the one to use, unless the installer is totally incompetant! Why do you want to change??
Depends on you make of dish, as there are two types of c120 feedhorns..a big one and a small one!
http://satandpcguy.com/Site/Resources/feedhornlarge.jpg
http://satandpcguy.com/Site/Resources/feedhornsmall.jpg
I use big one on famaval 1.8m and 2.4m dishes, and the smaller on on the other make of portuguese 1.8m dish. Sometimes you can use an invacom adjustable feedhorn as well for the 2.4s.
Adjustable
http://satandpcguy.com/Site/Resource...adjustable.png
There is also a completely different feedhorn for the "bulgarian" dishes....but these can be adapted to use the horns above.
But what is more critical is the distance from the dish of the feedhorn...it is critical, and is differnet for different makes and sizes of dishes, and the skew / rotation angle of the LNB.
A change in feedhorn can make a difference in reception, but it does not work miracles....as reception is a combination of LNB, feedhorn, location, dish site, cable type, cable run, receiever, local topography, local interferance, dish alignment, LNB distance, LNB skew...and a few other things....
Last edited by EsuriJohn; Feb 12th 2011 at 9:37 pm.
Feb 12th 2011, 9:21 pm
#4
Was called something else
Joined: Jul 2007
Location: Gandia, Valencia
Posts: 1,935
Re: Feed horn for LNB
Its the prime focus LNBs used on "big dishes" that require the seperate piece / feedhorn.
Universal LNBs, used on offsets, sort of have them build in, and so they dont require the seperate piece. They are called LNBF's ie LNBs with feedhorn.
http://www.ehow.co.uk/list_6764379_d...-lnb-lnbf.html
Amongst other thing, they help guide the wave to the LNB - a feedhorn is also called a wave guide.
http://www.tech-faq.com/feedhorn.html
Universal LNBs, used on offsets, sort of have them build in, and so they dont require the seperate piece. They are called LNBF's ie LNBs with feedhorn.
http://www.ehow.co.uk/list_6764379_d...-lnb-lnbf.html
Amongst other thing, they help guide the wave to the LNB - a feedhorn is also called a wave guide.
http://www.tech-faq.com/feedhorn.html
Feb 16th 2011, 10:45 pm
#5
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Joined: Jul 2005
Posts: 377
Re: Feed horn for LNB
But what is more critical is the distance from the dish of the feedhorn...it is critical, and is differnet for different makes and sizes of dishes, and the skew / rotation angle of the LNB.
A change in feedhorn can make a difference in reception, but it does not work miracles....as reception is a combination of LNB, feedhorn, location, dish site, cable type, cable run, receiever, local topography, local interferance, dish alignment, LNB distance, LNB skew...and a few other things....
I would only add Dish Size is critical !
Go Large !
Best
Loco
