##### Asked by: Ildefons Zatarain

asked in category: General Last Updated: 13th January, 2020# How do you find the focal length of a satellite dish?

**Focal Length**(FL) is the

**distance**from the feed horn to the centre of the

**antenna**. Measure the depth of the

**dish**(d) (indicated in green). One method is to use some fishing line across the face of the

**antenna**and then measure from the line to the centre of the

**antenna**.

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Consequently, how do you find the focus of a satellite dish?

To ** find the focal point ** of a parabola, follow these steps: Step 1: Measure the longest diameter (width) of the parabola at its rim. Step 2: Divide the diameter by two to ** determine ** the radius (x) and square the result (x ). Step 3: Measure the depth of the parabola (a) at its vertex and multiply it by 4 (4a).

Beside above, what is f'd ratio? The ** ratio ** of the focal length ** f ** to the diameter ** D ** of the reflector is called the ** f D ratio ** or focal ** ratio ** . In principle it is a free parameter for the telescope designer. In practice it is constrained. If ** f D ** is too high, the support structure needed to hold the feed or subreflector at the focus becomes unwieldy.

Furthermore, what is an offset satellite dish?

An ** offset dish ** antenna or off-axis ** dish ** antenna is a type of parabolic antenna. It is so called because the antenna feed is ** offset ** to the side of the reflector, in contrast to the common "front-feed" parabolic antenna where the feed antenna is suspended in front of the ** dish ** , on its axis.

How do you measure a dish size?

** Calculation for Dish Size. **

- All the telecommunication satellites are in the orbit above 36000 Km from earth .
- But in my area ( Thiruvarur ) is in out of coverage area.
- Here , we apply the values in formula.
- (FREQUENCY * DISTANCE) = 11958*2793 = 33398694.
- (36.6 + 20 (LOG (FREQUENCY * DISTANCE)) = 36.6 + 20 (7.523) = 187.06.