Black Ultra LNBF to C120 Conversion

D

DishDick

Regular Member
My Satellite Setup
.
My Location
Gran Canaria
Hi,

I know a couple of members have done this by sawing off the feedhorn and attaching a flange from another Inverto LNB. But there was talk of a company supplying modified singles for Prime Focused dishes, see pic
LNB4.webp

This looks like the front plastic has been cut off and the new feedhorn epoxy glued into the feedhorn of the Balck Ultra.

Now my question is, is the lenght of the lnb critical, or can the signal that is collected by the first feedhorn travel any distance down the neck (necks in this case) before it reaches the antennas?
 
Last edited:
I have tried the original LNBF (quattro), but no good on my dish. I want to try a C120 (quattro) version with my feedhorn. They don´t make one of those unfortunately.
 
DishDick said:
I have tried the original LNBF (quattro), but no good on my dish. I want to try a C120 (quattro) version with my feedhorn. They don´t make one of those unfortunately.
Click to expand...
OK.
If you locate the same waveguide, the same length, with another you'll have to play to find the point where the signal concentrate well, it's a hack and will have to play.
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OK.
Si localizas el mismo guiaondas, a la misma longitud, con otro tendras que jugar hasta encontrar el punto donde concentre la señal bien, es un apaño y tendras que jugar.

The LNB Inverto Black Ultra are 0.2dB Typ. (0.7dB Max.)
El LNB Inverto Black Ultra son 0.2dB Typ. (0.7dB Max.)
http://www.inverto.tv/products/product.php?section=1&id=57

Have one with 4 outputs almost the same characteristics that are Inverto Black Ultra 0.3dB Typ. (0.7dB Max.)
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Tienes uno de 4 salidas casi con las mismas caracteristicas que Inverto Black Ultra son 0.3dB Typ. (0.7dB Max.)

http://www.inverto.tv/products/product.php?section=1&id=73


Quattro say, is a separate LNB with 4 outputs per band and polarity.
I really want 4 universal outputs (Quad) for 4 tuners confirm you want / really want.?
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Dices quattro, es un LNB con 4 salidas separadas por banda y polaridad.
Creo que quieres realmente 4 salidas universales (Quad) , para 4 sintonizadores, confirma que quieres/buscas realmente.?
 
DishDick said:
Hi Tururu,

Yes quattro as I am using a multiswitch.
Click to expand...
I thought, but as for prime focus antenna, one multiswitch installation generates a lot of noise and we won by one side, the other pierdemos.
How many tuners want to feed, may I ask.?
Can you comment on the installation, curious.
Central to the tuner or a distribution by plant multiswitch dealers.?
Sorry for the translation.
----------------
Lo pense, pero al ser para una antena de foco primario, una instalacion multiconmutada genera mucho ruido y lo que ganamos por un lado, lo pierdemos por el otro.
Cuantos sintonizadores quieres alimentar, si puedo preguntar.?
Puedes comentar la instalacion, curiosidad.
De la central al sintonizador o una distribucion por planta con repartidores multiconmutados.?
 
Is that another one of my design mods I see ??
lol
I got very good results with this ..and much prefer a bolt together design ..
This way other feeds can be tried/sustituted such as the gibby feed etc..
rgds
VS
 

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LNB.webp
Behind the plastic cover is a fixed feedhorn (one size fits all) that you must remove first.
If you have a lathe and can mashine the new flange to fit the diameter in the bottom
part where the pickup rods are, you might have a chance. You can then leave the old
feedhorn but forget about glue and such stuff. Good metal to metal connection is
needed.
 
DishDick said:
Hi,

I know a couple of members have done this by sawing off the feedhorn and attaching a flange from another Inverto LNB. But there was talk of a company supplying modified singles for Prime Focused dishes, see pic
View attachment 61758

This looks like the front plastic has been cut off and the new feedhorn epoxy glued into the feedhorn of the Balck Ultra.

Now my question is, is the lenght of the lnb critical, or can the signal that is collected by the first feedhorn travel any distance down the neck (necks in this case) before it reaches the antennas?
Click to expand...

I've been looking at this today as well - to see if I can squeeze a little more from my system. Found a link to this supplier from one of our other threads: http://purplesat.com/index.php?p=1_55_LNBS. They can provide C120 modified versions. I emailed them today for price. May be of interest to you.
 
DishDick said:
Hi,

I know a couple of members have done this by sawing off the feedhorn and attaching a flange from another Inverto LNB. But there was talk of a company supplying modified singles for Prime Focused dishes, see pic
View attachment 61758

This looks like the front plastic has been cut off and the new feedhorn epoxy glued into the feedhorn of the Balck Ultra.

Now my question is, is the lenght of the lnb critical, or can the signal that is collected by the first feedhorn travel any distance down the neck (necks in this case) before it reaches the antennas?
Click to expand...

Out of interest, what sat receiver are you using? Humax?
 
There are several Ku-band LNBs for PFAs. One of them GI-209P. It works great, and I do not think that modified BlacUltra will outperform it. I used GI-209P on 150cm and was very happy with results.
 

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Waveguide said:
View attachment 61773
Behind the plastic cover is a fixed feedhorn (one size fits all) that you must remove first.
If you have a lathe and can mashine the new flange to fit the diameter in the bottom
part where the pickup rods are, you might have a chance. You can then leave the old
feedhorn but forget about glue and such stuff. Good metal to metal connection is
needed.
Click to expand...

That explains why my conversion did not work very well :(13168313543FA4C0F0.webp
 
Microwaves are tricky to predict, lots of theory but no-one has ever seen them.
Then there are the different areas of near-field, far-field and the worst one,
the somewhere-in-between-field. The tried and tested offers safe solutions
even if things could be made differently.
 
Curiosity made me open two more LNB's to get a look at the intestines.
http://www.satellites.co.uk/forums/attachments/61773/
The earlier image is also valid for Inverto Black Ultra down to the minutest
details in the fixed feedhorn. The first image is from a Televes LNB almost
ten years old. Some product development! A Nokia LNB from 2001 was a bit
different with slightly tapered parts. All had the dimensions of the
circular waveguide almost the same, down to half a millimeter difference.

The Invacom ADF-120 feedhorn has an inner diameter close to all the LNB's so
with a slight taper the transition will be smooth and comfortable for the
microwaves we are so eager to catch. If the other "improvements" I plan to
make to increase the S/N-ratio fails, I might be tempted to make a custom flange
for the Black Ultra the next time I'm close to a lathe. Since I already got this
LNB I might just as well check the truth in all the rumours.
 
Waveguide said:
The Invacom ADF-120 feedhorn has an inner diameter close to all the LNB's so
with a slight taper the transition will be smooth and comfortable for the
microwaves we are so eager to catch. If the other "improvements" I plan to
make to increase the S/N-ratio fails, I might be tempted to make a custom flange
for the Black Ultra the next time I'm close to a lathe. Since I already got this
LNB I might just as well check the truth in all the rumours.
Click to expand...

I will look forward to any future reports you may have regarding a custom flange for the Black Ultra.

If my Black Ultra offers no additional gain when I try it out (in a few weeks time) then I will be tempted to modify it so I can try it out with my Laminas feed horn.
 
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