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

[newtonn]

Ok thks,
i just want to the work of that plastic,
if i remove the plastic i have vertical and horizontal polarity?

 

[newtonn]

What i mean is that if i remove the inside plastic from the c-band lnb i will receive both vertical and horizontal polarity?
I also no that (mbc) nilesat are only transmitting on ku-band only.
I want to track down c-band sat that it's footprint fall to west africa.
Thks for your time

 

[ralphmagno]

hello,
before you remove the plate you should find our what is available in your area.
you should call a satellite installer and ask what satellite is available in c band and ku band.
if there is satellites in the c band and it needs the plate then you remove it the lnb will not work anymore.
you can not experiment on something if it is not be received
ralph

 

[ralphmagno]

hello again
go to a search on yahoo.
satellite reception south africa.
on lynsat you have the following.
68.5 east
78 east
66 east
13 east hotbird 8
some is c band some is ku band
there is a lot of africa pay tv service as well.
if you have a decoder and card and paying for the service
ralph

 

[newtonn]

good evening gurus,
plz i need to no how to input or use Frequency Polarization with circular R and L symbol with my decoder strong 4669x.
tjks

 

[ralphmagno]

hello,
we are going around and around and going no where fast.
what satellite are you trying to receive????
how can anyone answer the question?
ralph

 

[ralphmagno]

hello again.
ok your receiver strong 4669x is mpeg 2 and 4.
looking at the specks it is good for ku band and not for c band.
so your c band supermax is no good at all.
next it has conex decription .
your dish says dstv this is good for multichoise africa they use iderto-2 .
you should be able to receive ku band on 68.5 easst. there is not a lot that is free .
if you go to www lyngsat look at 68.5 east and 66 east.
do you have a decoder and card for dstv africa????
the c band will not work at all with this receiver.
free to air channels will work ku band and mpeg 2 and 4 will work.
mbc 1 and 2 and 3 will not work at all.
if you tell us what you want to receive and if you have a card and box we can advice better.
ralph

 

[newtonn]

hello,
we are going around and around and going no where fast.
What satellite are you trying to receive????
How can anyone answer the question?
Ralph

happy weekend to all gurus.............
Sir,
i really wanted to track c-band that it's footprint fall to africa.

 

[Analoguesat]

You are going at this the wrong way round. You need to decide WHICH C-band channels you want to watch of some particular satellite, then design your receive station around that info.

At the moment no-one can really help you as you are basically asking us to guess what you want.

 

[ralphmagno]

hello,
mount your c band feed and lnb.
alaign the dish to the 68 degree east satellite.
and here are some you can receive.
3.864 ghz h sr 19890
3.859 ghz v sr 3895
3.855 ghz v sr 3125
3.847 ghz v sr 7415
3810 ghz h sr3312

this is a start there are some free channels and some encrypted.

go to lyngsat.com
then fo to 68 east satellite there is many free that you can watch and some you can not watch
ralph

 

[newtonn]

You are going at this the wrong way round. You need to decide WHICH C-band channels you want to watch of some particular satellite, then design your receive station around that info.

At the moment no-one can really help you as you are basically asking us to guess what you want.

@Analoguesat, AS YOU SAID..........
HAVE INVESTED IN BIGGER DISH NOW, IT'S 3.2M DISH, NOW I NEED THE FEED-HORN LENGTH OF THE 3.2M DISH ALSO I NEED A LOCAL SCALAR RING THAT A WELDER CAN FABRICATE HERE IN MY PLACE.
IF THE PICTURE OF SCALAR RING CAN BE POSTED HERE, IT WILL HELP ME AND THE WELDER ALOT. I WILL BE HAPPY.
I THINK WITH THIS 3.2M DISH I WILL BE ABLE TO TRACK NILE-SAT?
THKS.

HERE HAVE UPLOAD THE 3.2M DISH

 

[ralphmagno]

hello,
if your using cetimeters use the following fomula.

focal point = diamater squared devided x 16 depth.

to measure the depth run a string from edge to edge and measure in the center to the dish.

example if the dish is 320 cm in diam and 30 cm depth we would have 102,400 cm devided by 16 x 30cm or 480
the answer is 213 cm from the center to where the lnb needs to be placed.
you can not make scaler rings by welding them.
if you are going to use the c-band lnb in the picture it has scaler rings built in.
thise rings in the center of the feed horn.
if you are going to use the ku band lnb you will have to buy a feed horn for prime focus with a c120 flange and then find a low noise lnb with a c 120 flange as well.
ralph

 

[newtonn]

hello,
if your using cetimeters use the following fomula.

focal point = diamater squared devided x 16 depth.

to measure the depth run a string from edge to edge and measure in the center to the dish.

example if the dish is 320 cm in diam and 30 cm depth we would have 102,400 cm devided by 16 x 30cm or 480
the answer is 213 cm from the center to where the lnb needs to be placed.
you can not make scaler rings by welding them.
if you are going to use the c-band lnb in the picture it has scaler rings built in.
thise rings in the center of the feed horn.
if you are going to use the ku band lnb you will have to buy a feed horn for prime focus with a c120 flange and then find a low noise lnb with a c 120 flange as well.
ralph

thks sir,
from your calculation is d answer 213 cm for the feed-horn? to use for dish

 

[ralphmagno]

hello,
what is the depth????
if the depth is 40 cm then its wrong.
you have to mesure the depth.
on one can guess by looking at a picture.
you have to run a string tight across the dish and measure from the centure to the dish centure.
without that measurment we can not know.
ralph

 

[newtonn]

hello,
what is the depth????
if the depth is 40 cm then its wrong.
you have to mesure the depth.
on one can guess by looking at a picture.
you have to run a string tight across the dish and measure from the centure to the dish centure.
without that measurment we can not know.
ralph

sir, i mean how do i calculate tripod length of my 3m dish, i need the fomular.
thks

 

[ralphmagno]

hello,
you should have some one who understands english better.
first of all it is not a tripod its feed horn support.
second first you say its 3.2 meters and then you say 3 meters?
third without measuring the depth no can figure the focal point.

you must do this.
measure the diameter in cm. is the dish 300 cm or 320 cm?
then pull a string across the center of the dish and from the center measure the depth.
without those 2 numbers no one can figure out where the focal point is.
with the diameter and depth we can figure the focal point
ralph

 

[newtonn]

hello,
you should have some one who understands english better.
First of all it is not a tripod its feed horn support.
Second first you say its 3.2 meters and then you say 3 meters?
Third without measuring the depth no can figure the focal point.

You must do this.
Measure the diameter in cm. Is the dish 300 cm or 320 cm?
Then pull a string across the center of the dish and from the center measure the depth.
Without those 2 numbers no one can figure out where the focal point is.
With the diameter and depth we can figure the focal point
ralph

sir, the dish is 320cm (3.2m) sir, here are the details of the 3.2m dish: Diameter: 320 cm (3.2m) radius: 160 cm (1.6m) depth: 52 cm (5.2m) thks

 

[ralphmagno]

hello,
ok thanks for the information. then from the information provided then
the focal point of your feed horn should be 123 cm.
this is measured from the center of the dish stright out.
also that all 3 support arms will be longer being that the run from the side.
so from the center of the dish where the dark area was in the picture straight out it will be 123 cm center of the dish.
this is a prime focus and not a offset dish.
ralph

 

[newtonn]

hello,
ok thanks for the information. then from the information provided then
the focal point of your feed horn should be 123 cm.
this is measured from the center of the dish stright out.
also that all 3 support arms will be longer being that the run from the side.
so from the center of the dish where the dark area was in the picture straight out it will be 123 cm center of the dish.
this is a prime focus and not a offset dish.
ralph

thks sir, but can you kindy teach me the calculation you use and
also explain the fomular you use.
thks

 

[ralphmagno]

the fomula of th focal point of a parabolic dish is
diamater squared devided by 16 xdept.

so if the diamater is 320 cm that that squares =102,400
depth is 52 cm so 52x16 =832

so 102,400 cm devides by 832= 123.07 cm
this is measured fron the center of the dish to where the feed horn and lnb till be sitting
ralph