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Frogwatch 11-09-2012 08:19 PM

Folding fabric satellite TV dish
 
I had no idea sat TV dishes are so expensive, but then I dont even own a tv.
Of course looking at them on RVs and near boats gave me the idea of making them from the silver coated ripstop nylon. Unfold from a bag, pop it open, use the equitorial mount to align with N and the built in protractor to align azimuth and elevation.
When done, just fold it down again.
Whats the advantage? Not knowing anything about TV, I can sort of surmise that size equals signal strength and size is easy with this stuff.
On a boat or RV, you cant carry a big dish but with this you can.

Another way to do it would be to make the nylon airtight and put a rigid plastic cover over it (G10) and use about 1 psi air to inflate it (the nylon) to a near spherical shape. Use a longer focal length to get best approximation to a parabola.

Siamese 11-09-2012 09:55 PM

Re: Folding fabric satellite TV dish
 
Why not just remove your aluminum foil helmet and use it?

Oh, hey...c'mon, I'm just kidding. Really;)

fallard 11-09-2012 10:46 PM

Re: Folding fabric satellite TV dish
 
The inflatable antenna has been done. See the patent at Patent US6963315 - Inflatable antenna - Google Patents, or check out the GATR corporate website (Home*-*GATR.com) for more info.

bljones 11-09-2012 10:52 PM

Re: Folding fabric satellite TV dish
 
http://nssdc.gsfc.nasa.gov/planetary...5_88_11901.jpg
that ain't neil armstrong's umbrella on the bow of the moon buggy

hellosailor 11-10-2012 07:23 PM

Re: Folding fabric satellite TV dish
 
bl, you're absolutely right. That was Buzz Aldrin's umbrella, it only looks upside down because the winds were so strong it inverted during a solar storm.

Froggie, give it up on the silvered cloths. If you inherited a boxload of silver lamé, sell it to some dancers or disco babes. Honest, that wheel has been invented before.

Frogwatch 11-10-2012 11:32 PM

Re: Folding fabric satellite TV dish
 
Being very aware of patents, I have seen those. However, I see none on the market. The patents are mostly expired. I think the inflatable one is a poor idea. There are even several patents fro collapsible fabric dishes but none on the market.

hellosailor 11-11-2012 12:36 AM

Re: Folding fabric satellite TV dish
 
"There are even several patents fro collapsible fabric dishes but none on the market. "
From which we can conclude? Go ahead, make some guesses.

Do you have any idea how much signal loss/gain there is in a fabric parabolic dish, versus a metal or metal mesh dish? How much gain is actually needed fo what application? And how the lower gain from a fabric dish will require a BIGGER dish compared to solid metal?

Or, how well the metalized fabric will hold up, or degrade, after a year in harsh sun?

You don't have to run the numbers to get a patent, but you DO have to run the numbers before anyone is going to be interested in marketing it. And if the numbers come out wrong--itdoesn't even pay to spend money on a patent.

Have you run the numbers?

Navigator Wannabe 11-14-2012 06:36 AM

Re: Folding fabric satellite TV dish
 
1 Attachment(s)
Ah, same same, but different.

Again, the shape of the dish is essential to reflect the signal such that it is CONCENTRATED in the receiver.
And that thing is going to be much harder to keep in shape than the radar reflector. That's why it might work on the moon, but not here. We have atmosphere, and wind.

Seriously, put your silver fabric on hot girl. That might be the best use of your overstock of silvery fabric, and free time. :)



Quote:

Originally Posted by Frogwatch (Post 946179)
I had no idea sat TV dishes are so expensive, but then I dont even own a tv.
Of course looking at them on RVs and near boats gave me the idea of making them from the silver coated ripstop nylon. Unfold from a bag, pop it open, use the equitorial mount to align with N and the built in protractor to align azimuth and elevation.
When done, just fold it down again.
Whats the advantage? Not knowing anything about TV, I can sort of surmise that size equals signal strength and size is easy with this stuff.
On a boat or RV, you cant carry a big dish but with this you can.

Another way to do it would be to make the nylon airtight and put a rigid plastic cover over it (G10) and use about 1 psi air to inflate it (the nylon) to a near spherical shape. Use a longer focal length to get best approximation to a parabola.


Barquito 11-14-2012 02:27 PM

Re: Folding fabric satellite TV dish
 
Personally, I think the "why not" questions need to be asked and answered. Usually, there is a good reason it is not done that way, but, you never know.

PaulinVictoria 11-14-2012 11:19 PM

Re: Folding fabric satellite TV dish
 
Quote:

Seriously, put your silver fabric on hot girl. That might be the best use of your overstock of silvery fabric, and free time.
How come my radar reflector doesn't look like that? :(


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