Focal Lenght question

[RT-Cat]

When you measure from the center of the dish to the LNB, just where to you pros stop with the measurement at or into the LNB?

RT.

 

[Larry1]

My fax from Winegard for my 1m dish indicated slightly inside the scaler cover.

 

[Magic Static]

The hard part of setting the focal point measurment is, where is the "Look Point" on your dish? Fortunately it's not as critical a setting as in C-Band dishes.

 

[avenger]

The hard part of setting the focal point measurment is, where is the "Look Point" on your dish? Fortunately it's not as critical a setting as in C-Band dishes.

Magic Static,

Since you own a 6' WSI Special dish like me , how deep into the scalar ring did you located the LNB. My LNBF is of a different brand (DMX-741), but maybe that would not make much of a difference.

My setup is working OK, but maybe it needs some modification and improvement for better reception and performance.

Thank You.

 

[Magic Static]

Magic Static,

Since you own a 6' WSI Special dish like me , how deep into the scalar ring did you located the LNB. My LNBF is of a different brand (DMX-741), but maybe that would not make much of a difference.

My setup is working OK, but maybe it needs some modification and improvement for better reception and performance.

Thank You.

From Chapparals web site I used this chart as a guide.
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
For all the info see this page.
Feedhorn Troubleshooting Guide | Chaparral Satellite Components

The 6' special wasn't special enough for me. I'm dumping it. I started with a DMX-741 but it didn't work well enough. The GeoSat pro was way better.