6' Winegard dish assembly-help!

[spike1202]

Hi all, can anyone help me with assembly of a 75" Winegard mesh BUD, especially the proper distance from dish to feedhorn 4 point mount? Any input would be greatly appreciated!!

 

[Lak7]

A little math involved, but not too difficult....
Footprints by Dish Size - Adjusting the Polar Mount for Prime Focus Antenna - C/Ku-Band Satellite Systems - Tuning, Tracking, Azimuth, Elevation, Declination Angles, F/D Ratio, Focal Distance, Inclinometer, LNB/Feedhorn Assembly, Actuator Assembly, C

 

[spike1202]

Thanks for the link! Is there a specific distance the feedhorn mount should be from the dish during assembly of this dish before the LNBF is installed and adjusted for the f/d ratio?

 

[Auric]

Thanks for the link! Is there a specific distance the feedhorn mount should be from the dish during assembly of this dish before the LNBF is installed and adjusted for the f/d ratio?

Yes there is a specific focal point...That focal point differs as I'm sure you guessed reading your post...What the ratio is...I don't know. Does the feedhorn you have not belong to the dish? Can you order the correct one if not?

 

[Lak7]

You set the Feedhorn in the Scalar to the proper f/d Ratio setting.
Then adjust Scalar to proper focal point to just inside the mouth of the feedhorn.
List your measurements, diameter, depth.

 

[spike1202]

This is what I've come up with:
D=75"
d=13"
So focal distance, f=27" & f/D=0.36
I think my math is correct but I'm having difficulty with the f/D "scale" on my BSC621 LNBF.
The scale markings are not as detailed as I've seen before. Is there a measurement I can make that would be more accurate than "eyeballing" the LNBF's scale markings?
Also, am I correct in understanding that the di-electric plate in the BSC621 negates the need for specific skew setting & adjustment?

75" Winegard mesh BUD w/ BSC621, Superjack II+, DSR922, Traxis 2500

 

[Lak7]

Numbers look good.
The Di-Electric plate is for receiving Circular C Band signals, not needed for North American Sats.
Best place to start for Skew is to pop the Feed Cap off and look inside. The 1/4" Metal Rod should be Horizontal when the Dish is at your Trues South Sat. Easiest with a Mesh Dish and look from behind. Otherwise, try making a mark on the outside for reference.
Here is some info from another site:
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

satmancanada.com/BSC621test.htm

 

[(((Garyd)))]

This is what I've come up with:
D=75"
d=13"
So focal distance, f=27" & f/D=0.36
I think my math is correct but I'm having difficulty with the f/D "scale" on my BSC621 LNBF.
The scale markings are not as detailed as I've seen before. Is there a measurement I can make that would be more accurate than "eyeballing" the LNBF's scale markings?
Also, am I correct in understanding that the di-electric plate in the BSC621 negates the need for specific skew setting & adjustment?

75" Winegard mesh BUD w/ BSC621, Superjack II+, DSR922, Traxis 2500

Post some pics and i can help you more

 

[DK_Sat]

Winegard 6'3" Dish Antenna

Reflector Diameter. 6'3" (1.9M)

Feed Type. Prime focus

Depth. 13.39"

F/D Ration. 0.35

Focal Length. 26-1/16"

 

[spike1202]

Hooty Hoo! Thanks for the great help y'all! Now I'm choppen on the bit for Saturday morning!!
It looks like I should tweek my focal length - shortening 15/16ths, check centering and leave my f/D @ .036 until fine tuning.
Further research with Winegard tells me my BUD is a "Quadstar", sound familar?