Gibertini OP150 unders spanish sun!!

[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

[kamaleon]

Well in that case what does "C band tolerance" have to do with it? It's a matter of optics: you receive the c band satellite off centered, there's nothing overwhelming about it, it's just the way it is. It would make sense to talk about tolerance if you had your dish pointed at 34.5W and you were receiving 34.5W with the off centered C band lnb which is not on the main focus but would still look towards the centre of your dish. Anyway, nevermind, forget about it, if you don't understand I don't care

[pipino]

Anyway, nevermind, forget about it, if you don't understand I don't care

thanx for your time waisting anyway...............

[kamaleon]

If you think helping people out on forums is a waste of time, then I am sorry for you

[pedro2000uk]

Great photos Pipino...

I checked the dimensions on those C Band feed horns.. they exactly match the f/d ratio- inner scala cone angle on the Channel Master KU feedhorn... Do they make a noticeable difference between them fitted or not?

[Huevos]

if you had your dish pointed at 34.5W and you were receiving 34.5W with the off centered C band lnb which is not on the main focus

I think you are missing something here. If the dish is pointing at 34.5W and you are receiving KU, everything is centred. Looking at Pipino's pictures I'd guess the C band LNB's are about 15 cm off centre which with the 1.2 metre LNB arm equates to about 7 degrees. The dish must be moved 7 degrees so the C band LNB comes into focus. Obviously the tolerance that Pipino is talking about is the small aberration due to the LNB being slightly off centre, not some tolerance caused because the dish is not correctly orientated towards the satellite for an off centre LNB.

[pipino]

I think you are missing something here. If the dish is pointing at 34.5W and you are receiving KU, everything is centred. Looking at Pipino's pictures I'd guess the C band LNB's are about 15 cm off centre which with the 1.2 metre LNB arm equates to about 7 degrees. The dish must be moved 7 degrees so the C band LNB comes into focus. Obviously the tolerance that Pipino is talking about is the small aberration due to the LNB being slightly off centre, not some tolerance caused because the dish is not correctly orientated towards the satellite for an off centre LNB.

thats exactly what i mean .spot on
@pedro2000uk
do you mean the final position of the 3 feedhorns on the arc line when facing the LNB from the front?

[pedro2000uk]

..............
@pedro2000uk
do you mean the final position of the 3 feedhorns on the arc line when facing the LNB from the front?

no ...just the internal cone shape / scala rings ... see last two posts in \\\\\\\\'lnbs in the raw\\\\\\\\' ... the internal angle = 45 degrees as does those C Band feed horns.

[pipino]

hi pedro ,

here is my actual set up on DMS BSC421 C Band LNBs
on Zinwell LNB the Plate goes accross verticaly as the shape and design of the LNB is different. i need to take some pictures again showing the whole setup including the offset feedhorn as i dont have any left in my workshop..cheers
---linear -------------circular

[Huevos]

Pipino, how are you switching between LNB's?

[pipino]

i use diseq X4 switch ,but i will change it for the "Spaun SAR 411 WSG" soon as this one sometimes just dont do the switch correctly

[pipino]

just snaped this strange channel from Guinea RTG on intesat 907 27º frequency 3936 R SR:4549 1/2

[deepbluesky]

pipino it's rather unlikely but i will dare to ask you about 70W. This satellite has no official coverage above Europe but the most analogue (suppose in PAL N) carriers on. Are you aware of anybody in Spain and especially the Canarias with a monster dish can get a noisy picture using high LT ?

[pipino]

pipino it's rather unlikely but i will dare to ask you about 70W. This satellite has no official coverage above Europe but the most analogue (suppose in PAL N) carriers on. Are you aware of anybody in Spain and especially the Canarias with a monster dish can get a noisy picture using high LT ?

hi,
looking at the coverage map of 70ºW ,i would say it should be possible but with at least a 6M monster dish but may be even with a good 4.20m too,,shame i dont realy know anybody stationed in canary island with that type of gears

[deepbluesky]

I see. In theory you could be right but just to mention some exceptions:
72E NE Ku Asia Beam received on 4.60m in Eastern Hungary
95E India Beam also one frequency once received instabile on 3.70m in Eastern Slovakia
43W/3874V Americas beam received in Italy and Greece on 3m
74W Ku Band NA Beam analogue was received on 1.20m in Western Ireland

And 70W should be easier to locate because of still analogue transmission.
What a pity you don't know anybody there. But it's worth to try it also on Madeira where neutron has a 4m and why not also in Portugal or Southern Spain ?

[pipino]

I see. In theory you could be right but just to mention some exceptions:
72E NE Ku Asia Beam received on 4.60m in Eastern Hungary
95E India Beam also one frequency once received instabile on 3.70m in Eastern Slovakia
43W/3874V Americas beam received in Italy and Greece on 3m
74W Ku Band NA Beam analogue was received on 1.20m in Western Ireland

And 70W should be easier to locate because of still analogue transmission.
What a pity you don't know anybody there. But it's worth to try it also on Madeira where neutron has a 4m and why not also in Portugal or Southern Spain ?

yes indeed ,after seing Mr shumacher from Brasil ,its possible to get anything realy just a matter of trying ..from my part i wish i could put a 6 monster dish on top of my building but surely i will last only few days as a free persone as my neibours are realy pissed off with my dishes already,just this afternoon i´v put my new 90cm FIBO dish ,tommorow i will post the pictures..regards