Gibertini OP150 unders spanish sun!!

[guest poster]

Thanks Pipino.... and I just saw the previous link to those C Band offset feedhorns... 60 Euros .. oops are they any good?

 

[pipino]

hhmm 60€ ,a bit expensive i think ,unless you have it with a feedhorn ,yes they are very good i tested many different ones and this one has that extra difference,guys from german DX board could make a comment about it

 

[Huevos]

Hi Pipino,

I'm just trying to eyeball how deep you have got the Andrew's feedhorn positioned but it's not possible with the pictures that have been posted. I've read somewhere that the feedhorn needs to be as far from the dish as possible as the dish is 0.66 and the feedhorn for 0.60. What have you done here?

One other question: the channels you listed on Astra 2D, did you receive them with the LNB skewed for the arc or skewed for 2D?

 

[pipino]

Hi Pipino,

I'm just trying to eyeball how deep you have got the Andrew's feedhorn positioned but it's not possible with the pictures that have been posted. I've read somewhere that the feedhorn needs to be as far from the dish as possible as the dish is 0.66 and the feedhorn for 0.60. What have you done here?

One other question: the channels you listed on Astra 2D, did you receive them with the LNB skewed for the arc or skewed for 2D?

if you take the black holders coming on the CM feedhorn pack you can read on one side antenna you put them facing outboard as it pushes the lnb on the farest point from the dish (see the picture below)..tommorow i will retake few fresh snaps and post them here the lnb is skewed on the arc but refined at 24º clockwise on astra 2d ..by the way it will be nice posting some pictures of your system ;)..best regards

 

[kamaleon]

Sorry for the dumb question, but your cband lnbs are off-centered, how do you move the dish accordingly to be able to get the sat you need for them?

bump bump

Bump again?

 

[pipino]

Bump again?

try to use your imagination,yes you are right its not centred 100% but is off set about 3º to 5º out of the main focus point,but knowing the tolerence C band has you can have this margin

 

[Huevos]

by the way it will be nice posting some pictures of your system

I haven't got it all together yet; been a bit too busy lately. I'm building the concrete base at the moment. I've got everything except the receiver now. As soon as I get it together I'll post some pics.

By the way, what's that LNB? I thought you had a QDF-031.

 

[pipino]

ok m8,thanx;),the LNB in the picture is an Inverto Flange Twin ,works very well specialy in vertical transponders (like BBC HD ,ITV and channel 4+1) but QDF31 beat it for the horizontal ,especialy 10.714 H as i cant see it with inverto ,the picture you see is the first tests i´v made when i started the setup..cheers

 

[pipino]

here is another one from the african pond,,very strong signal here already reported by qwer on global footprint Intelsat 53º west "ORTM" from Mali 4161 R SR 5750 fec 1/2..shame no sportmax possible

 

[kamaleon]

try to use your imagination,yes you are right its not centred 100% but is off set about 3º to 5º out of the main focus point,but knowing the tolerence C band has you can have this margin

If one was to use his imagination why come to a forum

So you mean everytime you move your dish to a C band bird it's always 3° to 5° out?

 

[pipino]

yes correct

 

[kamaleon]

So if you put your motor to 26°E you will receive 26°E on the off centered C-band lnb? I don't really get it - you should be receiving let's say 30°E or someting like that. How come?

And you reckon that doesn't make much of a difference?

 

[pipino]

if your have a V36 motor you cant use USALS ..so all positions are stored manualy so you do what ever you like ,even if there is an offset for example if the decoder say you are at 26º east in real the dish is on 30º for example

 

[kamaleon]

Yes, but I'm not talking about how your motor works or is pointed at, I'm talking about where your dish is aiming. I'll put it another way: when you receive 34.5ºW on your C-band lnb, where is the main focus of your dish (=your Ku band lnb) pointed at, please?

 

[pipino]

the LNB used for 34º west is the one on the left facing the dish,so looking at the picture you can figure out more less

 

[kamaleon]

I must be too dumb to figure out by myself so I'll ask it again: when receiving 34.5W where is your Ku band pointing at?

edit: if what you're saying is that when you receive 34.5W on your Cband LNB your dish is actually centered at around 37W~39W, then I reckon your previous statement doesn't make much sense:

So you mean everytime you move your dish to a C band bird it's always 3° to 5° out?

yes correct

 

[pipino]

lets say the Ku band LNB is pointing to hotbird ,straight on the main focal at 100% centre and the C band LNB(on the left) is pointing astra,if you didnt get this sample ..i´m not answer you again ..LOL

 

[kamaleon]

Why make it complicated when you could give simple answers? I really don't get it, am I bothering you?

Wouldn't your dish perform better on Cband if the lnb was centered on the main focus of your dish? As before you said it didn't make much difference. I understand that you can't have 3 dishes for each band / polarisation but if you could just simply answer that I would appreciate, as you said it didn't make much difference I'm just trying to understand that.

 

[pipino]

Wouldn't your dish perform better on Cband if the lnb was centered on the main focus of your dish?

yes of course ,and its logical ,but because C band tolerance the loss is minimal thats why i said that

but if you could just simply answer that I would appreciate

i answerd all your questions,now i think

 

[pipino]

back to the main topic ,this morning when up and i did some modifications ,i toke some snaps from the updated dish,after that nasty weather few weeks back i decided to change the main mast for something stronger ,also i did some LNB swaping to test the performance in C-band ,you can see major change on how the dish and the LNBs are holding now ..enjoy;)