What type of lnb to use for 1.8 (108cm) dish

newtonn · Apr 19, 2011

Robbo said:
The F/D is the focal length (distance from lnb to dish) divided by the diameter. You can check the focal length measurement by measuring the depth of the dish.

_http://www.dmsiusa.com/articles/focal%20distance%20ratio%20formula.pdf

It is good to have the F/D of the LNB matched to the dish in order to be illuminated properly. That is the reason why an LNBF for an offset LNB isn't much good for you, as they are designed for dishes around the 0.6 to 0.7 mark. Prime focus dishes are usually less than that (but don't have to be!)

@Robbo
ok have got the F/D ratio: 0.38
so what will i use the value for?

Robbo · Apr 19, 2011

Someone with Prime focus expertise needs to answer this one, Huevos??.

The invacom adjustable feedhorn falls within that range I belive, but as said previously,some say it's crap and 'eats signal'. Though seemed OK for those freqs when I used it last on a 1.8m PF,of similar F/D.

You may find a feedhorn that states its F/D, now that would be useful.

newtonn · Apr 22, 2011

Robbo said:
Someone with Prime focus expertise needs to answer this one, Huevos??.

The invacom adjustable feedhorn falls within that range I belive, but as said previously,some say it's crap and 'eats signal'. Though seemed OK for those freqs when I used it last on a 1.8m PF,of similar F/D.

You may find a feedhorn that states its F/D, now that would be useful.

@Robbo,
plz, is there any site you no that can calculate dish size for particular footprint.
eg like nilesat footprint to my country nigeria?
i need the exact dish size for my location.
any help will be appreciated.

Lazarus · Apr 22, 2011

newtonn said:
@Robbo,
plz, is there any site you no that can calculate dish size for particular footprint.
eg like nilesat footprint to my country nigeria?
i need the exact dish size for my location.
any help will be appreciated.

Try something like this

_http://www.flysat.com/dish.php

Rick · Apr 22, 2011

Fringe reception isn't an exact science. The best you will get off any site is a rough idea. And someday aren't all that accurate. Dishpointer is a mile out on some.

Robbo · Apr 22, 2011

newtonn said:
@Robbo,
plz, is there any site you no that can calculate dish size for particular footprint.
eg like nilesat footprint to my country nigeria?
i need the exact dish size for my location.
any help will be appreciated.

I don't know, I generally just suck it and see.

Analoguesat · Apr 22, 2011

newtonn said:
@Robbo,
plz, is there any site you no that can calculate dish size for particular footprint.
eg like nilesat footprint to my country nigeria?
i need the exact dish size for my location.
any help will be appreciated.

Not possible for extreme fringe reception.

Received signal strength can vary greatly over a few miles or km.

The best you will get is a general idea of what *should* work. You are far better off finding some local knowledge - we are good on this forum but we dont have much experience with reception in west Africa

newtonn · May 7, 2011

dear friends,
help me answer my questions;
1, can the fuji LNB work on that fiber dish?
2, can it track nilesat?
3, is that superMAX a c-band LNB?
4, can that foil work for fiber dish?
thks.

Analoguesat · May 7, 2011

2) Unlikely - you have already been told that you are well out of coverage area for Nilesat and will need a very big dish indeed to have any chance whatsoever of getting the channels off 7W.

newtonn · May 7, 2011

Analoguesat said:
2) Unlikely - you have already been told that you are well out of coverage area for Nilesat and will need a very big dish indeed to have any chance whatsoever of getting the channels off 7W.

ok thks sir,
what of the superMAX LNB?
can it work for the dish?
thks

ralphmagno · May 7, 2011

hello,
ok your dish is a 1.8 cm prime focus.
your lnb is a ku band offset.
you would need a prime focus feed horn with a c120 flange.
then you need a lnb with a c120 flange to mate the two togeather.
you need to find someone in your area to see if they receive this mbc channel.
if no one in your town can receive this with a 2 meter dish then you will not be able to receive this as well.
ralph

ralphmagno · May 7, 2011

hello
more information
there seems to be no c band on 7 west.
the signal reaches northern africa but no where you are.
you are at the gulf of guinea and the signal is too week to be received even with a large dish.
if there is anyone receiving this he must have a big dish 4 or 6 meters in diamater.
ralph

newtonn · May 7, 2011

ralphmagno said:
hello
more information
there seems to be no c band on 7 west.
the signal reaches northern africa but no where you are.
you are at the gulf of guinea and the signal is too week to be received even with a large dish.
if there is anyone receiving this he must have a big dish 4 or 6 meters in diamater.
ralph

@ralphmagno,
is the superMAX c-band LNB?
will it work that fiber dish?
also the foil is it good to use for fiber dish
thks

ralphmagno · May 7, 2011

i do not know what the foil is for?
the c band will work with fiber because the fiber has metal in the paint that reflect the signal.
but no mbc on c band and nothing on nilesat 7 west.
there may be other c band signals in your area.
ralph

newtonn · May 8, 2011

good morning masters.
can someone help me post the picture of a C120 type LNB?
i will be very glad ti see how it look.
thks

Analoguesat · May 8, 2011

Go to google.com. Put c120 lnb into the search box, and click on the images tab. You will get any number of lnb pics

newtonn · May 8, 2011

Analoguesat said:
Go to google.com. Put c120 lnb into the search box, and click on the images tab. You will get any number of lnb pics

sir, i have done that but the result of it brings so many type, which am not sure of the actual type.
plz help me with the actual one
thks

Analoguesat · May 8, 2011

For Ku band signals buy a Ku type.

For C band signals buy a C type.

newtonn · May 8, 2011

DESCRIPTION
CAN SOMEBODY PLZ EXPLAIN THE MEANING OF THE SUPERMAX LNB.
PARTICULARLY, LINEAR AND CICULAR?
CAN IT WORK ON VERTICAL AND HORIZONTAL?
THE MOST VITAL QUESTION; WHAT WAS INSIDE THE FRONT OF THE LNB AND WHAT IS THE FUNCTION?

Polarity: Vertical and Horizontal
Type: linear and circular
Includes scalar ring
Includes Bakelite to convert from linear to circular LNB
Input Frequency: 3.4-4.2 GHz
Output Frequency: 950-1750 MHz
Local Oscillator: 5150 MHz
Standard Type
Noise figure at 17 ° K
65dB Gain
THKS

ralphmagno · May 8, 2011

Hello
first of all this lnb is for c band reception.
the plastic plate is for circular poleration.
the plate changes the poleration to circular.
some satellites transmit on c band and some on ku band.
some c band transmit circular right hand and some left hand.
ku transmit vert and hors poll.
you set up will not pick mbc in lagos with your 1.8 meter dish at all.
if you were in nothern africa it would be different.
in order to find out what your system is good for you should find out from another satellite installer in your area and see what they are able to receive.
just like i can not receive USA satellites in Europe.
your supermak is for c band from 3.4 to 4.2 ghz .if there is no c band available in lagos then that lnb will be no good.
it would more than lokely require a 10 meter dish to receive this.
there was german man that built a 16 meter dish in brazil and was able to watch german tv from europe.
he was a electronic enginere
ralph

What type of lnb to use for 1.8 (108cm) dish

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