C band LNB on Fibo 120?

Captain Jack

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Hey guys, my Fibo is sitting at my parents doing very little. Occasionally I connect to my F15 to check fringe Ku-band things but it's all more or less the same stuff.

I would like to finally have a go at C-band stuff. Is Fibo suitable for that with its sub-reflector? If so, any interesting mods for it to cope with a larger LNB? I am guessing that the Fibo feedhorn is no good for C-band as it's too narrow.
 

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hi
i,v seen pictures of a C band setup on a fibo -- a year or two back using the sub reflector but not the fibo feed ,
-- maybe saw it on on "F--- owners - forum " ?
probably only good for the strongest C band sats though , i would think a setup using the main reflector only and fitting a C band l.n.b and conical feed at the sub reflector position would work better , could be an interesting experiment ?

cheers -- :)
 

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Alex , I did it my way . Its regular 60 mm and 40 mm PVC fitting material wich I modified (on the lathe , off course :-doh2 )
First tried it with the conical scalar , but that didn't give a better result .
Postings "c-band lnb for fibo" at F----owners
 

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Captain Jack

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Hey Trust :) Yes, I've been reading about that there. It doesn't look as straightforward as it sounds (to me anyway), so I may leave this project until the summer - maybe I'll contact you about that later :) The problem with the conical feed seems to be that it's blocking some of the surface area of the sub-reflector. Quite innovative what you've done though! If only I had a lathe... and knew how to use it.
 

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OK guys, I am ready to try C band now! Trust sent me the collar for the LNB, just need to fabricate a simple spacer.

So, which C band LNB should I go for? Not really bothered about getting Ku band at the same time but would be nice as long as it doesn't affect C band reception.

Also, what do I make these polariser plates from? They seem to be just some polystyrene type material..?
 

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I use one of these
_cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=190508919044 and I think Vipersan does too.
It came with a plate but they aren't as good as home brew ones. I'm lucky enough to own one made by a forum member but a very simple alternative can be cut from a plastic chopping board, VS started a thread on it some time back, it'll explain the type of board you need. Mine cost a quid from the local £ shop and took five mins to cut up with a Stanley knife.
 

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Captain Jack said:
OK guys, I am ready to try C band now! Trust sent me the collar for the LNB, just need to fabricate a simple spacer.

So, which C band LNB should I go for? Not really bothered about getting Ku band at the same time but would be nice as long as it doesn't affect C band reception.

Also, what do I make these polariser plates from? They seem to be just some polystyrene type material..?
hi -
i wouldn,t bother with a combined C/ku unit -- i,m certain the ku will be very poor --
the l.n.b. aceb suggests seems very good -- and i,v found the BSC 421 performs well on my setup
i notice " trust1" reported better results without a conical feed ( perhaps it blocked some of the signal from the main reflector - getting to the sub reflector? ) different setups seem to favour different design,s or types of polarising plates - just need to experiment - and find which one is best for yours ---
i look forward to seeing the results of your efforts :)

cheers ---
 

Captain Jack

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OK, thanks. I guess there is no "Black Ultra" equivalent for C band? :)

Also, what's the noise figure rated at? It seems to rate at K (Kelvin?) - what does that mean? The lower the better or...
 

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nelson_b said:
hi -
i wouldn,t bother with a combined C/ku unit -- i,m certain the ku will be very poor --


cheers ---
I´ve heard same also from everybody who tried it. But anyway I ordered one for test. Its Universal Ku/C so not these upper band (ku) only what mostly are. Sadly it looks taken quite a time to fly from GB. 3 weeks gone and two times mail "Thank you for your order which has been processed and dispatched". Hope i`ll get it sometimes soon, that can test it. Probably tests will tell same that Ku usefull but I still hope it works with mesh dish..?
 

Captain Jack

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Mesh dish is fine for C band.

There are a bunch of Russian made/modified C/Ku band LNBs with decent-ish results but it would be tricky to obtain them due to postage restrictions, although I am sure there are ways around that. These guys make all sorts of modifications to all sorts of LNBs (including Black Ultra) - mainly modifying feedhorns for popular dishes used in Russia (mainly Supral) and converting offset LNBs for PF dishes. ht_p://forum2.alyno.ru/phpBB2/viewtopic.php?p=714
 

aceb

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Yes, the lower the better although with such low cost items I'd take any figure with a pinch of salt. Not that I know how the temperature relates to noise and weak signal performance LOL There isn't really a huge selection of LNBfs for C band, all the suppliers I've looked at sell either of two models in single output and they seemed to be badged or cloned from each other.

Interesting Russian site CJ, never seen a PF dish mounted to a diseqc motor like that! I've been looking at it through Googles translator, there's another page with an unusual device on hxxp://forum2.alyno.ru/phpBB2/viewtopic.php?t=414 Translates as a "White Shark Jaws" depolariser.
 

Captain Jack

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For once, Google translator translated correctly! Seems like a depolariser, I am guessing for circular signals. There are so many LNB modifications on that site with information thrown around various threads, it's difficult to see what does what. But I haven't spent a great deal of time on it.

RimaNTSS is the one who pointed me to that site - he probably knows a lot more about these.
 

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Yes, owner of that site is actually very technical person and he owns company which makes all this stuff and sells via internet. Of course, this is business - to make money. They have many interesting inventions. I have not tested any of their products. Just ordered one C/Ku LNB for one of mine PFAs.
Owner of that company - pseudonym Alyano, at the same time is very interesting person, he managed to make lots of animes in Russian-speaking SAT-forums, and gives banning everyone in his forum who is not agree with his opinion or starts to make some arguments. Beside that, I think he is very talented person and makes interesting things for SAT-reception.
 

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Ordered the BSC421 C band LNB without Ku on it along with the scalar ring from the States (CD Tronix didn't have that in stock). Will try and experiment with the Fibo's LNB arrangement, first using the sub-reflector and without the scalars and then along-side the sub-reflector at off-set arrangement. Will see which one brings better results....
 

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RimaNTSS said:
Yes, owner of that site is actually very technical person and he owns company which makes all this stuff and sells via internet. Of course, this is business - to make money. They have many interesting inventions. I have not tested any of their products. Just ordered one C/Ku LNB for one of mine PFAs.
Owner of that company - pseudonym Alyano, at the same time is very interesting person, he managed to make lots of animes in Russian-speaking SAT-forums, and gives banning everyone in his forum who is not agree with his opinion or starts to make some arguments. Beside that, I think he is very talented person and makes interesting things for SAT-reception.
Very "interesting" posting Rima .How could make an opinion about Alyno's product if you never test any of his products?!

BTW , I have never subestimate Alyno's products,of course.This white shark teeths are fine " on theory " but in practice they have a poor gain in areas where the signal is low.
I tested smt. similar a couple of years ago but the main problemo is that the elements are too thick.Some copper wire max 1mm thickness I think is a better way, but consider that I say nothing until I made some tests



True in case of dual C/Ku lnb too!
Experts like DX Bozoth from Hungary and satuloge from Germany always use a sliding mechanism that changes the Ku and C band lnb in focus .On satellites with poor signal the dual C/Ku lnb is a headacke, but works fine on 5 deg west and 75east ,I tested last summer.
 

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2 doktorofsat: I have my personal opinion about his products not from my own experience testing them physically, but from readings from another users in different sat-forums. And, BTW, did I tell my personal opinion about his products? Where? I think that I have said something about interesting.
When I get my C/Ky from Alyno, after testing I could probably express my opinion about that particular LNB.
However, I have opinion about standard, out of the shelf C/Ku - it maybe works not so bad in C-band but awfully in Ku band, especially after installing polarization plate. :-wow
Anyway, IMHO, installing separate antennas for C and Ku bands is more practical option.
 

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A heavy discussion about receiving C-band on a Triax 110 cm offset dish on a dutch board , make do again some tests on C-band .
Also the fact that I have another LNB : Panorama 13º
Receiving already pictures at 20E , 2E , 5W , 11W , 40.5W
Bad performing for Hor and Vert TP's by the dielectric plate is common known .
The AV-COMM polariser would be a better (Also for Circ. TP's) but expansive option ,
Polarwandler  innen.jpglooking for alternatives on several boards brought me this idea .
I took the half part of a juice bottle , burned (with my smoking iron) at both sides in a vertical line 4 holes .
In each hole i put a 4 mm aluminium rivet ( took the steel pins out) 4 rivets of 12mm and 4 of 16 mm long , sealed the outside with Tesa transparant tape .
The greater bottom reaches out and give me the opportunity to twist it for maximum result .
Testing at 5 west the signal improved at TP 4.137L (SLBC TV) with the DE plate 83/72% and now 88% signal / 79% quality
With a new scan i found 1 more channel there , all the other sat positions i still have to do .
onderdelen depolarizer.jpgdepolarizer 4nails size.jpgdepolarizer 4 nails lnb.jpg

@Captain , fine tuning make me find out that signal improve when the spacer under the clamp is 8 mm shorter .
 

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Anyway, IMHO, installing separate antennas for C and Ku bands is more practical option.
agree 100% Rima


<span>Trust1 try the dielectric plate that i presented a few years ago here on the board</span>
 

Captain Jack

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The LNB is here :D It arrived with a plate to insert already - made out of the same stuff that circuit boards are printed on.

@Trust1 - I will make an adjustable spacer and will check for the best result.

@Doktorofsat - can you point me in the direction of your plate?
 

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Captain Jack said:
The LNB is here :D It arrived with a plate to insert already - made out of the same stuff that circuit boards are printed on.

@Trust1 - I will make an adjustable spacer and will check for the best result.

@Doktorofsat - can you point me in the direction of your plate?
hi - captain jack --
"some " of the info on plates is here -- http://www.satellites.co.uk/forums/topic/115537-dielectric-plate/
its quite a long thread -- with info on " Doctor of sat,s " plate design -- and results.
and experiments with vipersan.s T plate

cheers -- :)
 
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