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Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
11 May 2012, 12:47 PM (This post was last modified: 11 May 2012 12:56 PM by vinay_kumar.)
Post: #1
Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
hello
Make an Aluminium C-band satellite dish antenna in less than Rs600 and enjoy more than 180 free channels with no monthly charges

Materials needed: Aluminium strips of sufficient thickness (to withstand wind pressure), aluminium mesh / sheet, screws, nuts-bolts, Free-to-Air MPEG2 set-top box (MPEG4 DVB-S2 set-top box is recommended), C-band LNBF, Wires, F-connectors.

Tools needed: Pliers, Lock Planar, Hack saw, Drill machine, drill bits, screw driver, spirit-level, pen, paper, newspaper.

[Image: uH0pJ.jpg]

Procedure:

Plot this curve as per formula given below on a big newspaper.

[Image: l67JD.jpg]

[Image: kRG3V.jpg]

[Image: 0v51U.jpg]

[Image: C3VoI.jpg]

Get the straight thick Aluminium strips of required length:

[Image: mVdUO.jpg]

Bend the strips as shown below:

[Image: NsB8g.jpg]

Finished Rib will look like this:

[Image: GqgZg.jpg]

[Image: iQhHu.jpg]

[Image: PHhgn.jpg]

Make the edges even by using a hand planar:

[Image: UnCQn.jpg]

Cut off extra portion of rib if any:

[Image: XVd5U.jpg]

Go on making the ribs:

[Image: oHXJM.jpg]

More the number of ribs, more well-defined and strong is the shape:

[Image: VLl36.jpg]

Next part: Drilling screw holes in the ribs, assembling the dish, making LNBF arm and floor/wall stand.
Keep visiting WorldOfDTH.com for more such interesting topics.
Thx
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11 May 2012, 12:56 PM
Post: #2
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Excellent tutorial vinay bhai...very useful Smile

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vinay_kumar
11 May 2012, 12:58 PM
Post: #3
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Great tutorial vinay,so no matter what size dish you want the formula is the same?

@Vinay can you explain the derivation of the formula from basic formula y^2=4ax?

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vinay_kumar
11 May 2012, 12:59 PM (This post was last modified: 11 May 2012 01:00 PM by vinay_kumar.)
Post: #4
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Thanks Deep bhai. I am right now fitting the Aluminium solid metal sheet on the ribs. Later tomorrow I will connect to set-top box and present screenshot of various Hindi and Punjabi free channels received from Insat 4A satellite.

This 120cm dish is just due to request from members to make something affordable and light-weight. I also have bigger dishes being made.
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11 May 2012, 02:56 PM
Post: #5
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Lol, lot of mathematics involved D Means a person needs to have knowledge of maths too..?

Waiting for the 2nd part of thread now...Smile

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vinay_kumar
11 May 2012, 03:17 PM (This post was last modified: 11 May 2012 03:26 PM by vinay_kumar.)
Post: #6
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
(11 May 2012 02:56 PM)Deep Wrote:  Lol, lot of mathematics involved D Means a person needs to have knowledge of maths too..?

Waiting for the 2nd part of thread now...Smile

hahaha ... yes Deep ji its like refreshing maths and geometry skills tounge
Thats why i gave some ready x, y co-ordinates of the graph so that those interested can directly start with plotting graph without jumping into calculations D

(11 May 2012 12:58 PM)arsh25 Wrote:  Great tutorial vinay,so no matter what size dish you want the formula is the same?

@Vinay can you explain the derivation of the formula from basic formula y^2=4ax?

Arsh, yes you are right, we can go on extending the curve to get a dish of desired size. The formula is the same. only y coordinate will change if the LNB focus point value takes some other value than the one shown above. For bigger plotting, staple 2 - 3 newspapers at the edges.

In short, lesser the focal length f, deeper is the dish and vice-versa.

The formula is derived from the focus of parabola equation as given here:
http://www.analyzemath.com/parabola/parabola_focus.html
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12 May 2012, 11:50 AM (This post was last modified: 12 May 2012 12:26 PM by vinay_kumar.)
Post: #7
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Ok. Thanks all.

So now each of these ribs have to be drilled to make holes at appropriate point like at the center and along the rib for fixing reflector sheet.
Mark the other points on the rib before drilling

[Image: tF3Gs.jpg]

[Image: 1Z8Nz.jpg]

[Image: 8I8ik.jpg]

Screws can be used to fix mesh/sheet on the ribs.

[Image: dHBqo.jpg]

You can also use screw with washer and nuts.

[Image: LVO0y.jpg]
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12 May 2012, 01:43 PM
Post: #8
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
any formula to find location of drilling holes or it is an eye estimate?

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12 May 2012, 01:46 PM (This post was last modified: 12 May 2012 01:48 PM by vinay_kumar.)
Post: #9
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
(12 May 2012 01:43 PM)arsh25 Wrote:  any formula to find location of drilling holes or it is an eye estimate?

No need of any formula/calculation to drill holes, just make sure that the sheet metal takes a parabolic shape after it is fixed to the ribs with screws.

Also more the number of screws holding the sheet, more well-defined is the parabolic reflector shape.
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arsh25
12 May 2012, 02:27 PM
Post: #10
RE: Make an Aluminium C-band satellite dish antenna in less than Rs600 Part 1
Good work Vinay bhai.
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