Where can i get a cband offset conical scalar ring

**antenna1** · 05-08-2009

I am going to have a go at cband and need a offset conical scalar ring is there any seller in the uk or europe of the scalar ring

***Turok*** · 05-08-2009

Hello!
you mean a normal scalar ring,where you put your lnb in?
or you buy a new lnb,then usaly this scalarring is included!

i have one here,if you want,i can send to you!

**antenna1** · 05-08-2009

Hi i have a prime focus scalar ring that came with the lnb but need a offset one to use on a offset dish if you see this site you can see the offset scalar ring _http://www.wsidigital.com/conical-scalar-ring-for-offset-dish.htm is this the type you have. Thanks

Originally Posted by Turok

Hello!
you mean a normal scalar ring,where you put your lnb in?
or you buy a new lnb,then usaly this scalarring is included!

i have one here,if you want,i can send to you!

***Turok*** · 05-08-2009

Hello Antenna 1!

yes,i have that item you looking for,complete with exotic cband lnb from rusia!
only the weather protection plate in front is missing but you dont need this!
the cone in front off,give you better signal performance,but only on ofset antennas!
not working on pfa!

i dont use ofsetantennas,only pfa!
this item is very rar,you dont find in europe,in german its called"trichterrillenfeedhorn"!

**Satcom1** · 05-08-2009

Originally Posted by antenna1

I am going to have a go at cband and need a offset conical scalar ring is there any seller in the uk or europe of the scalar ring

This works better then the consumer rings. Cost < $5

***Turok*** · 05-08-2009

HellO!
Satcom!
where i can purchase this ?
how much is the diffrence?

**doktorofsat** · 05-08-2009

I tested 49E on my 125c offset dish, in C band of course.My Qth has an advantage getting this bird.The power tp is TV Komi all other are lowes , and sure you not get TV2Denmark which has 7/8 fec

offset dishes are not so good for C band receptions unless you are in a good coverage

***Turok*** · 05-08-2009

what was the bigest offset dish ever procuced?
to use this cone?
to geht optimeized performance
i only find mabo form poland with 1,86 m,

how,someone,can technicly explained,why this only work on ofset,but not on prime focus dishes?

**antenna1** · 05-08-2009

Hi this is what i am looking for

i sent you a pm did you get it thanks.

Originally Posted by Turok

Hello Antenna 1!

yes,i have that item you looking for,complete with exotic cband lnb from rusia!
only the weather protection plate in front is missing but you dont need this!
the cone in front off,give you better signal performance,but only on ofset antennas!
not working on pfa!

i dont use ofsetantennas,only pfa!
this item is very rar,you dont find in europe,in german its called"trichterrillenfeedhorn"!

***Turok*** · 05-08-2009

Hello!
i just replyed!by mail!
sorry my inbox was full,i dont receive the 2.massage you sent!

**Channel Hopper** · 06-08-2009

Originally Posted by Turok

what was the bigest offset dish ever procuced?
to use this cone?
to geht optimeized performance
i only find mabo form poland with 1,86 m,

how,someone,can technicly explained,why this only work on ofset,but not on prime focus dishes?

Largest one I know (and have worked with) is a 3.8m (four piece configuration).

Feeds are designed around the antenna design. A prime focus feed requires signals from what is effectively a deep dish, (up to 0.3 or 0.35 f/d) and so the scalar system is more efficient using a set of rings on a planar surface. With an offset dish (where the focal point is identical, but the antenna reflector is a fraction of the original template of the prime focus design) the needs of the feed are not only to receive the signals, but to reject the outside noise.
In this case a horn becomes a better collector of signal.
Please note the above is for microwave signals, once the frequency needs drop to below C Band, the yagi becomes a suitable candidate for efficient reception. On, and above Ku band frequencies, other direct means of receptor can be as good as a set of scalar rings.

**Satcom1** · 06-08-2009

Originally Posted by Turok

HellO!
Satcom!
where i can purchase this ?
how much is the diffrence?

You can't purchase this you can make it or have someone make it for you. I use springy roof flashing. Others go to their local printer and get flat aluminum sheets that are otherwise thrown away.

Typical is 6% SQ gain.

Photo courtesy of Walrus1957

**antenna1** · 05-09-2009

Thanks i am going to try and make

one just need to find some flat ali metal sheets

.

Originally Posted by Satcom1

You can't purchase this you can make it or have someone make it for you. I use springy roof flashing. Others go to their local printer and get flat aluminum sheets that are otherwise thrown away.

Typical is 6% SQ gain.

Photo courtesy of Walrus1957

***Turok*** · 05-09-2009

Hi!
we need exact shematic,and details of the size to make a clone of this!,otherwise,it looks like a imposible mission,that bring not the results we looking for!

**Channel Hopper** · 05-09-2009

Originally Posted by Satcom1

Photo courtesy of Walrus1957

Bit small that

Here's the real thing

_http://www.aoc.nrao.edu/evla/geninfo/memoseries/evlamemo95.pdf

and how to make one from scratch

_http://books.google.co.uk/books?id=ZZw7MHFuqF8C&pg=PA300&lpg=PA300&dq=Ring-Loaded+Corrugated+Waveguide&source=bl&ots=8UuizqgP ZH&sig=fGuqFHcYZnZMOCGuNamNX90WzOA&hl=en&ei=f2GiSs zaKpTd-QaevtDkDw&sa=X&oi=book_result&ct=result&resnum=6#v =onepage&q=Ring-Loaded%20Corrugated%20Waveguide&f=false

**doktorofsat** · 05-09-2009

Originally Posted by antenna1

I am going to have a go at cband and need a offset conical scalar ring is there any seller in the uk or europe of the scalar ring

bettet get a prim focus dish a d the results will be much better

***Turok*** · 05-09-2009

Hi there!
when the size is the same,1,86m lets say,is there a realy big diffrence in cband,between pfa and offset?
i never tested this!

**Channel Hopper** · 05-09-2009

Originally Posted by Turok

Hi there!
when the size is the same,1,86m lets say,is there a realy big diffrence in cband,between pfa and offset?

None at all, though I would be interested if the o/p comes back with proof of that claim.

**antenna1** · 05-09-2009

Right got some sheet metal just need to know how do you make the rings in to a cone shape

Originally Posted by Satcom1

This works better then the consumer rings. Cost < $5

**doktorofsat** · 05-09-2009

Code:

None at all

THE PFA DISH IS MUCH BETTER if it has a f/d ratio between 0.41-0.43 !!!

Many manufacturer have deep pfa dishes with 0,36 f/d ratio and there are real garbage
4 exaample my 1,5m pfa dish has f/d=0,42 and performs really fine

***Turok*** · 05-09-2009

Hello Doctorofsat!
and all others!!
sure,yes my channel master dish has f/d under 40 if i remember right 34?

but how,the this manufactor real measuring,the real gain winning of a dish,in there data sheets?
in the past,many companys like gibertini on there ,150m this,and irte ,on my 1,86 m dish,make little design faults,in the lenth of the lnb holder!
mostly it was to long,and has to be cutted,to get better performace,like o n the old orbitron sx 12 dish also,all companys,has a ascendancy,but the tech data sheet say no word about it,how the real stated gainwinning in the sheet itsef has been calculated,to get this gain winning value,that you can see on the techpaper!
same on lnbs,expect swedish microwave,all other companys,dont put a data sheet in there lnb package!
and the dish manufactor,also dont tell us,what eqitment,the have used,that the can say,antenna a wins for example 41 db in kuband and 38 in cband for a 2,40m

on the tech sheet of channel master i read about my antenna for expample

crosspolarisation on axis minimum 30 db
VSWR(Maximum)i dont know what this means 1.3

many things,what we read in the sheets,does not reflect the reality,how the signal realy will be ,because,ther to many ascendancy,other unkown sources!

**Channel Hopper** · 05-09-2009

Originally Posted by doktorofsat

Code:
None at all
THE PFA DISH IS MUCH BETTER if it has a f/d ratio between 0.41-0.43 !!!

No proof as yet then.

**Satcom1** · 08-10-2009

Originally Posted by antenna1

Right got some sheet metal just need to know how do you make the rings in to a cone shape

If you take a sheet of paper and cut it into a circular shape you can form a cone. All you need to do is cut a line from the edge to the center. Then hold the disk at its circumference and pull the edges to overlap. The more you overlap the deeper the cone.

In making the Scalar you just trim off the excess overlap not needed for the seam.

By now you have likely made your own cone Scalar. But if not it is very easy. I used Super Glue.

**Satcom1** · 09-10-2009

Simple to make all you need is what you see here.

gipras · 13-10-2009

hi everybody, this week i made this scalar ring with some copper.i tested with my gibertini 1 mt diameter.with original scalar of the lnb panorama,i got nothing from satellites,instead with this original feed i got arabsat and express am1.
@satcom1 Can you tell me which satellites you see with your 1mt dish?
best regards

Adminwe request that you upload images to our server not link to others

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)