Inverto Black Ultra & 1.8m Prime Focus Dish?

nabih

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Hello everybody
Iwill be receiving a 1.80m prime focus dish tomorow hoping to get north beam BBC channels
I would like just to know if my BLACK INVERTO lnb will work with a prime focus dish
I hope to hear from you very soon my friends .Thanks.
 

Lazarus

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I've changed your Thread title to something more specific ............ (I assume you did mean the Black Ultra?)
 

nabih

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Tivù said:
I've changed your Thread title to something more specific ............ (I assume you did mean the Black Ultra?)

Hello tivu
My LNB is a BLACK INVERTO o.2db generally designed for OFFSET dishes
What i would like to know if that type of lnb could give good results with a prime focus dish .thanks
 

Lazarus

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Yes, but is it the Black Ultra or is it the Black Premium, specifically ? .................. I want to be sure the Thread title attracts those who can give you an authoritative answer.
 

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Tivù said:
Yes, but is it the Black Ultra or is it the Black Premium, specifically ? .................. I want to be sure the Thread title attracts those who can give you an authoritative answer.

It is a BLACK ULTRA lnb and very expensive here in ALGERIA
 

Lazarus

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Ok. Thread title refined.

Still working hours here in UK, so if I were you I'd wait for a few hours for replies
 

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There are enterprising members who have successfully grafted the black ultra LNB onto a prime focus feed ..with great results ..
But this does mean cutting the feed off the black ultra ...so not for the faint hearted..
Perhaps those who have tried this can advise ..
But if you don't want to destroy what is an expensive lnb in your country ..then source a more suitable lnb with a c120 feed/coupling
rgds
VS
 

nabih

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Tivù said:
Ok. Thread title refined.

Still working hours here in UK, so if I were you I'd wait for a few hours for replies

What is the difference between the BLACK ULTRA and the THE BLACK PREMIUM INVERTO lnb .
Is anything to do with their performances
 

nabih

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Vipersan said:
There are enterprising members who have successfully grafted the black ultra LNB onto a prime focus feed ..with great results ..
But this does mean cutting the feed off the black ultra ...so not for the faint hearted..
Perhaps those who have tried this can advise ..
But if you don't want to destroy what is an expensive lnb in your country ..then source a more suitable lnb with a c120 feed/coupling
rgds
VS
thanks sir
 

Channel Hopper

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No difference in frequencies.

Which 1.8 dish are you using ?
 

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Channel Hopper said:
No difference in frequencies.

Which 1.8 dish are you using ?

In fact it is an old 1.80m dish used in the 1990 s as a collective dish for a building
Since then everyone has his own dish so i got it for nothing
I hope that time has not reduced its performance since
 

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There is a Black Pro variant for prime focus dishes, personally I would prefer to get that one than doing experiments and eventually destroying the offset version...

_http://www.inverto.tv/products/product.php?section=1&id=171
 

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I'm using a Black Pro on my 1.8m PF, seems to do a good job although I've nothing to compare it too. When I spoke with my dish manufacturer they recommended this adjustable feedhorn. _http://www.globalinvacom.com/products/adjustablefeedhorn.php
 

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I can recommend lnb Black Pro+Feedhorn Invacom C-120 --- only for antena pfa
another LNB with good results is lnb Black Pro Twin Flange LNB+Feedhorn Invacom C-120 ---only for antena pfa
DSCF2592.jpg
DSCF2597.jpg
DSCF2618.jpg
 

nabih

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strs65 said:
There is a Black Pro variant for prime focus dishes, personally I would prefer to get that one than doing experiments and eventually destroying the offset version...

_http://www.inverto.tv/products/product.php?section=1&id=171

You are surely right str65 but infortunatly i doubt finding out this special lnb in ALGERIA
I am really embarassed and i don t want taking the risk of damaging my black inverto.Really a big problem.
Thanks for the thread.
 

nabih

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aceb said:
I'm using a Black Pro on my 1.8m PF, seems to do a good job although I've nothing to compare it too. When I spoke with my dish manufacturer they recommended this adjustable feedhorn. _http://www.globalinvacom.com/products/adjustablefeedhorn.php
Thanks aceb for the thread
 

nabih

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Hello everybody
This is an S.O.S
Is there anybody who had successfully grafted a black ultra inverto lnb onto a prime focus feed
Thanks for the answer
 

BM300

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Try this option from Inverto

Twin Flange BlackPro LNB 40mm

It works like charm.

twinf-thumb.jpg
 
A

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nabih said:
Hello everybody
This is an S.O.S
Is there anybody who had successfully grafted a black ultra inverto lnb onto a prime focus feed
Thanks for the answer

I think you'll find that this specific question has been answered in post #7. One such thing is Pipino's conversion:

http://www.satellites.co.uk/forums/...verto-twin-black-ultra-flange-convertion.html

But please note this is a destructive process, and may not give the results you are looking for. Probably better off ordering a C120 Inverto off the internet.

Also note that the Black Ultra will most likely work as-is with your dish, you just won't get full signal strength.
The reason is that the F/D factor, which expresses the focal depth and beam width generally is higher on an offset dish (about 0.60-0.65) than a PF one (0.30-0.45).
Which F/D ratio the LNB is made for is determined by the feedhorn design.
The feedhorn inside the Black Ultra generally supports an F/D of about 0.60 (if I remember correctly).

This means that if you point a Black Ultra at a PF dish with an F/D of, say, 0.38, it will only see a smaller part of the reflector surface (probably something like 1/2 to 2/3 of the dish face). In other words it will probably work, but you will not use all of the surface of your reflector.
This can be a serious source of disappointment if you can't see Astra 1N after having obtained a 1.8m dish for the purpose.

This is why you are better off with an LNB with the correct feedhorn than slapping the Black Ultra on it.
 
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