FD for Paraclipse 12' dish

[CHANGSUE]

Hi Guys,
I have a 12 foot Paraclipse C/Ku dish but I have lost all of the technical data that came with it.
I am currently trying to install a new feedhorn and I am hoping that someone can provide me with the FD and FD ratio or tell me how to compute them.

Thanks
Changsue

 

[qwert1515]

I hope this link helps: Geo-Orbit

Also this thread should be moved to the FTA section - C Band (a moderator will do that).

 

[Tron]

A 12-foot version of my favorite BUD! I'm jealous

 

[Lynskyn]

The Paraclipse Classic 12' (not round - more of a spider web shape) has a focal distance of 53.375" and an F/D ratio of .375.
The Paraclipse Eclipse 12' (round) has a focal distance of 47.875" and an F/D ratio of .333.

 

[Babadem]

The Paraclipse Classic 12' (not round - more of a spider web shape) has a focal distance of 53.375" and an F/D ratio of .375.
The Paraclipse Eclipse 12' (round) has a focal distance of 47.875" and an F/D ratio of .333.

For those that have their 12ft button hook Paraclipse up and running is that the correct F/D ratio?

 

[Magic Static]

I use this formula from Chaparral
Formulas for calculating focal distance and f/D ratios
To calculate the focal distance, you have to measure the diameter (D) and the depth (d) of the dish. Measurements should be in like units (you can’t use feet for the diameter and inches for depth). For the example, we will say we have a dish that is 120 inches in diameter (D) and 18 inches deep (d).
focal distance (f) equals the diameter squared (D x D) divided by 16 times the depth (16 x d) or :
D x D = 120 x 120 = 14400
16 x d = 16 x 18 = 288
D x D/16 x d = 14400/288 = 50
focal distance f = 50 inches
After you have calculated the focal distance (f), you can use that figure to calculate the f/D ratio of your dish. In this case, using the same diameter (D) = 120; and the calculated focal distance (f) = 50
f / D = 50 / 120 = .416
f /D = .416 which you would round up to give you a setting of .42
The list below shows how far the throat is out from the scalar rings for different f/D settings.
EXAMPLE: A dish with a .42 f/D will have the throat about flush with the rings.
Inches — f/D
.12 —— .42
.32 —— .40
.52 —— .38
.72 —— .36
.92 —— .34
1.12 —- .32

 

[waylew]

Beats me,i just stuck the C band ortho on mine and fiddled with it till I was happy.What it's actually set at,I have no idea.
Pclipse 12' Classic.

 

[phlatwound]

I've got an old chart that I saved from somewhere on the Net, a few years ago.

It lists the 12' "Paraclipse Classic PT" and the 12' "Paraclipse Classic CD" as both having a focal length of 53.375", and an FD ratio of .375

The 12' "Paraclipse Eclipse Series" shows a focal length of 47.875" and an FD ratio of .333

 

[Babadem]

I use this formula from Chaparral
Formulas for calculating focal distance and f/D ratios
To calculate the focal distance, you have to measure the diameter (D) and the depth (d) of the dish. Measurements should be in like units (you can’t use feet for the diameter and inches for depth). For the example, we will say we have a dish that is 120 inches in diameter (D) and 18 inches deep (d).
focal distance (f) equals the diameter squared (D x D) divided by 16 times the depth (16 x d) or :
D x D = 120 x 120 = 14400
16 x d = 16 x 18 = 288
D x D/16 x d = 14400/288 = 50
focal distance f = 50 inches
After you have calculated the focal distance (f), you can use that figure to calculate the f/D ratio of your dish. In this case, using the same diameter (D) = 120; and the calculated focal distance (f) = 50
f / D = 50 / 120 = .416
f /D = .416 which you would round up to give you a setting of .42
The list below shows how far the throat is out from the scalar rings for different f/D settings.
EXAMPLE: A dish with a .42 f/D will have the throat about flush with the rings.
Inches — f/D
.12 —— .42
.32 —— .40
.52 —— .38
.72 —— .36
.92 —— .34
1.12 —- .32

Well done!