It’s indeed an amazing image and to think we have it because a guy with fabulous sides glued a emergency blanket to an umbrella makes it even better. Has a good story attached to it.
Congratulations, you have recreated the type of folding satellite dish that was used on the surface of the Moon by Apollo astronauts, to return live video to Earth. The ability to fold, portability, light weight, and ease of setup was very important to them... and they didn't have any wind to contend with. Impressive results! You might get better reception if you can find an umbrella with a center "handle" made of fiberglass or some other dielectric. I have a feeling that the aluminum handle on yours may be doing your yagi no favors. Very cool video.
@@Crazen2the conspiracy theory is cover up for the fact that NASA funded the missions by letting Stanley Kubrick shoot his films in space to save on special effects costs.
What i always wonder is why they would need to fake it? I don’t see the point. Also don’t forget that at that time the Soviets where also pouring a massive amount of funding in their space capabilities. And ofcourse in intelligence. Combining all that the likelihood of the Soviet Union finding out if it was fake in a 20 year span is not that unlikely. That would have been major.
One way to cut mylar coated plastic foil is by sticking a bit of copper wire in your soldering iron then dragging a u-bend of it across the top of the foil. I use that method for both cutting and heat fusing mylar for blimp envelopes. Or just use your normal soldering iron element held at a slant if you don't mind gunking it up.
So they make higher end photography umbrellas that use an aluminized Mylar lining. That would work better. The other ones are just shiny(ish). They and most “metallic” spray paints use garnet dust for the shininess.
Garnet dust? I don't think garnet dust is shiny - it's basically sand (ground up garnet rock). It's what you use in sand blasters and waterjet cutters. It's not shiny, it's usually red
@@gorak9000"Garnet" covers quite a wide range of crystalline materials, some of which can be opaque and some can have gemstone-like transparency. e.g. YAG (Yttrium Aluminium Garnet) was used as a low cost diamond substitute in jewelry before cubic zirconia, and is used today in lasers and fibre optics devices.
@@ferrumignis Interesting. I never knew what the G in YAG stood for. I think it's also used in microwave RF components - filters and couplers or circulators. It has some unique properties! I didn't know being reflective / shiny was one of them! Or maybe that's YIG, and YAG is mostly for optics / lasers
@@gorak9000 In addition to being a very hard material, garnet is a beautiful gemstone that comes in a variety of colours. Interestingly, for centuries, it was believed that garnets came in all colours except blue. I believe blue garnets were recently discovered, but I could be wrong. Also, an alternate name for garnet is carbuncle. And that's why the titular 'blue carbuncle' from the Sherlock Holmes mystery was so special!
I still have a few emergency blankets from the 90s they have much a thicker metal layer. its so thick it can block all signals when I wrap my phone into it
I think you could just put the space blanket (or other metallic layer) on the outside of the umbrella. Your first experiment showed that the umbrella cloth is rf transparent. It may be easier to fold down the umbrella if the metal's on the outside - less harsh angles when collapsed. Plus it should be easier to apply since you don't have to work around the spokes.
The SDR radio is £54 GBP (over $70) here in the UK, but I am going to get one next payday thanks to you and your easy to understand videos. Great Channel-
Great video as always. Maybe you could try a steel screen door mesh and cut it with a box cutter along the ribs of the umbrella so it can fold nice and easy. Might try it myself now that you have sparked my brain with this video.
aluminum screen is cheaper, lighter, and easier to cut :) Actually, I don't even think you can get steel screen mesh - at least not for windows - it would rust the first time it rained.
Awesome stuff. Beyond the extraordinary astrophotography that is in reach of most these days is planet sized collaborative interferometer astro radar. Time to make it happen.
Maybe a metal anti mosquito mesh would also work, but IDK about the holes in it. The advantage of it is that you can sow it into the umbrella and that it being a mesh makes it actually bendable.
Wavelength at 1.7GHz is 17.6cm, and to be effective as a reflector the holes must have a diameter well under 10% of the wavelength (1.76cm or very approximately 2/3 inch). If your mosquitos are bigger than this I want nothing to do with them 😂
@@ferrumignis I've seen mosquitos that large, but they don't bite and are quite funny to watch trying to evade you. They are unbelievably flimsy and clumsy
Thanks for your vids. Perfect level of interesting technology without getting too deep in the weeds. Enough that gets my brain ticking and encourages me to research .
Neat, that text data at 8:21 is instantly recognizable as METAR data from Airports. From all over the country too; KBBD Brady TX, KBDU Bolder CO, and KBGE Decatur Georgia to point out a few.
Made me happy to see how well that worked. I have seen some 3d printer fume tent boxes on linustechtips that had a flexible yet very metallic looking interior. They seemed tough. Makes me wonder if that stuff could replace the cloth of a regular umbrella.
Watched like 10 of your videos, I subscribed today because of the DiY stuff 🙃 As a robotics engineering student this is the kind of stuff that is cutting edge that I draw inspiration from for projects. 🙃
What you said at the end is exactly why i appreciate this channel so much, that and just your honesty and genuine enthusiasm. I must admit that i don’t understand half of what your doing when it comes to all the software but it’s the professionally winging it that’s really inspiring to see. Case and point of when you know the rules your can bend them. (Not in a legal way but as in if you know how stuff works you can do stuff with it like you do.)
Maybe try spray adhesive and brass flyscreen (its not too expensive and much more flexible than stainless flyscreen), would be much more conductive than the blankt. Also painting on contact adhesive thinned down with automotive thinner work much like spray adesive (better coverage for the price), also applying to the outside not the inside should fold up much better. But cool video, great to see.
Neat! I've wanted to make or invest in a ball mill so to be able to more cost effectively make my own conductive paints. Not only for similar antenna related projects; PCB's, flexible fabric paint for RDF clothing gear and other sensor potential, shielding, etc. repair projects.
There is electrically conductive paint that was applied to a model of the Ho229 to simulate the metal parts for radar experiments. They wanted to test the stealth properties of the Horten Ho229. The only drawback of this paint is that it is very expensive as it contains silver. The idea with the rescue blanket is not bad, and the idea of converting an umbrella into a satellite dish is also not bad, so I have a multifunctional umbrella. There is also zinc spray, which is 99% zinc and electrically conductive, which would also be worth a try. I saw a RUclips video of a Russian who built one of the largest 3D printers in the world for plastic, on which you could print individual segments to build a backpack-portable satellite dish. To have internet everywhere via Starlink on the hunt for Bigfoot.
This was cool. The hurried wrinkled application represents what it would really be like, in an emergency, needing to get that signal having been wrapped up in a marathon blanket after the James Bond mission _(peeling off the blanket to avoid creases and then fashioning an adhoc brolly dish like that)._ A "ParaBrolla" could be its name. There would be people finding the concept of making it ever the moreso cheap and retrofitted (upcycled) from various qualities of mylar or, instead, that much cheaper atomised aluminium spray onto plastic rather than the mylar that is pricier which has foil betwixt 2 plastic sheets. At some point, even though the glued brolly fashioning technique makes a different, the atomised aluminium versus high quality mylar would in some cases be worse but good enough to still be workable, doable, and inexpensive. Radio dishes are interesting because a carrier signal _(either by the style of digital, like FPGA versus Phase-Locked-Loop)_ help the tolerance of getting a signal done and dusted onto a rig and stored as data. My comment has no hate in it and I do no harm. I am not appalled or afraid, boasting or envying or complaining... Just saying. Psalms23: Giving thanks and praise to the Lord and peace and love. Also, I'd say Matthew6.
13:09 - Great video as always Gabe. I’ll keep an eye out for one of those emergency blanket, umbrella and spray adhesive shops while I’m out later on ;-) Kitchen foil is probably better, but whatever you use, I reckon that it’s a one-way thing in terms of being able to fold it up again.
I still think foil HVAC tape worked better and was easier to apply smoothly, but I couldn't fold up the dish again with that! I did get a decent signal with a smaller diameter umbrella using the foil tape.
One thing to keep in mind is that an LPDA has a hair too much gain for really deep dishes like your umbrella. The feed will only "light up" the central perhaps 40-50% of the reflector. In fact, feeding really-deep parabola is a bit of a black art. That's why you'll find sat dishes typically in the F/D range of 0.3 to 0.5.
It's not really a black art - a simple waveguide feed with an adjustable choke ring around it to adjust the angle of illumination, is pretty universally used on all large parabolic dishes
They're also flexible solar panels and there have been attempts to make solar panel umbrellas in the past, including myself, I'm sure patents have expired by now.
The problem with Mylar, is it is a real metal surface. But it’s as close to a single atom thin as possible. Satellites use Mylar as faraday protection, but it’s a special gold Mylar. Also with shorter wavelengths, every wrinkle starts to matter. I think a far more difficult, but far more effective solution would be to cut off the fabric, and use it as a template to sew together a new cover out of Faraday fabric, or an ultra fine metal mesh if you can find it. Also cut a true parabolic curve out of cardboard to bend the frame into a more accurate shape while it’s off.
The question is, would a standard yagi antenna be just as or more effective? Yagi antenna are simple to build also but are technically horizontally or vertically polarized so perhaps the parabolic collector is better.
@@mrbyamile6973 I haven’t looked into dishes much. But it’s probably significantly more effective than a Yagi alone. Otherwise satellite command stations would just be using Yagis by themselves. I think the antenna still uses a Yagi because it has great rear and side nullification.
Great video! I am fascinated by this, and I plan on trying myself. I wonder if automotive headliner adhesive would be a good choice? I'm in Virginia and have seen GOES16 shoot through my telescope view quite often, then I look by eye. I enjoy watching satellites disappear into darkness when they cross the day terminator. I followed Tiangong One for about a year until it fell to Earth. It's a good thing we are not neighbors! Your ingenuity is truly inspiring, thank you.
The v4 is pretty similar, I think it has a slightly different frequency range and lets you see lower frequencies, but I haven't had the occasion to use that yet.
So this is totally random, but I work at a glue factory and one of the things people have trouble with is spray-on glue. It's really easy to not end up with enough adhesive, you need a thicker layer than you think you do.
how many race horses with broken legs does it take to make 1 small bottle of white school paste?? How many horses does it take to make glue stick?? I bet horses hate the start of school season
Autoparts store sell copper gasket stuff in an aerosol can. Stinks, but I wonder if it would work? It's not paint to be clear, it's used on headgaskets and such as a sealant, but it's liquified copper.
Yeah, foldable mylar antennas/reflectors has been a thing in space for years. I have also seen one taping a mylar blanket over a bucket and then draw a slight vacum in the bucket to get a parabolic shape. It might be easyer to tape a mylarsheet to a ring and make a lid from something that does not block the signal and pump it to the correct parabola. Also you should have aimed for the best signal and then tryed to manually move the antenna to find the focalpoint, that's where the gain is...
I did move the feed around to try and find the focal point, and it seemed best right about where the math said it would be. Still seems weird to me, but it is a pretty flat umbrella.
You should have cut the blanket to each individual panel of the umbrella. Also, if a spray can is empty, remove the spray nozzle and jam the end of an air compressor on the actual nozzle of the spray can. Like refueling a torch.
If you get a tire air stem (the tapered rubber part) and keep the air valve in it, it presses down on the nozzle, but stops the air blowing back out. The air stem base fits in the circle on the top of the can. Give it a shot. They can be bought at any local tire reseller for between 3 and 5 bucks. Just make sure it has the valve in the stem.
If he had two of these umbrellas that were exactly alike and he didn't mind sacrificing one, he could carefully use a seam ripper and take it apart... and use the pieces of cloth as a pattern to cut mylar exactly to shape. These are a fairly complex shape that is not triangular (called a "gore") that you will see on hot air balloons. It's more complex by the fact that it is not on a perfectly parabolic curve.
I don't think the color silver is as important as the conductivity. Maybe some copper bottom boat hull paint or some other conductive paint may work better?
Looking at actual photography reflectors, I think it's worth trying to get your hands on one of these. All the ones I'm seeing have many more ribs so they're a closer approximation of a circle, and do not have the kink half way along the ribs, so they overall do actually try to approximate a parabola; where this one is just sort of vaguely similar to a parabola. Also seeing ones that are much deeper parabolas if that matters, you mentioned this being really shallow. The approximate parabolic nature of the reflector is important in photography because the goal is to create a light source that is coming in fairly parallel from a large area, it casts different shadows, more daylight-like shadows. They also look far more metallic, nearly to the point of having a reflected image (and they're huge, silly huge, 7'+). They are expensive is the thing. Maybe someone in the area can lend you one for a video. Unless you think you'd use one for your video, or for shop lighting, I don't think it makes sense to spend this much on one video.
Gold leaf? Vapor deposition? You think you could electroplate the inside of that umbrella? I really like the idea of a lightweight, portable, durable parabolic, but durability seems like the kicker. I was really hoping the paint would work.
Good video. Would like to see if maybe the focal calculation was off. Moving your feed horn in and out and seeing the difference. If you don't mind sharing, what camera and editing software do you use. I take video of my project, but hate to edit.
I did try moving the feed in and out, and that was where it worked the best. I use a Canon Vixia I got from @GardenforkTV and I use Shotcut on Linux for editing.
Get two of your pcb antenna's and one of those cheap network analyzers and measure transparency by looking at signal with and with out the test sample. The reflection ignoring losses then is R=1-T. So if tran is 25% then the R is 75% more or less. I would use copper tape for a reflector. maybe alu foil.
@@saveitforparts Cu is a better conductor. You can also get Cu with conductive adhesive. That's probably not necessary. In fact Al is probably fine. :)
Im definitely saving this video for the Zombie Apocalypse!!! BTW another banger. Keep em coming & ignore the trolls. They’re just unhappy because they realized it was their fault their dad left to get milk and never came back….. just sayin
I would have glued smaller sections to keep it smooth, sort of like a disco ball and with a substrate so the mylar panels would be easier to apply. At least have serrated the parts of the flexible webbing so it can bend without tearing the delicate mylar. Anyways, this is all fascinating and has my brain going. It's unfortunate the practical implications are so slim.
You can make a simpler antenna drive by manually rotating the antenna to the azimuth of max elevation, pitch an antenna axis to the maximum elevation, then you just need a motor to pivot the antenna on the axis.
what if u put the blanket on the other side of the umbrella the fabric should be radio transparent so it shouldnt matter if u cant see the shiny bit, that way you wouldnt need to cut it up and maybe get a more contiguous reflector surface
How about an emergency ('space') blanket over a circular form that you pull a vacuum on? It would be shallow, so the focus would be pretty far out there.
What else other than an umbrella could be use with the emergency Mylar film blankets? What’s stopping you from say making a carboard, ply, or even plastic based antenna. Keep up the epic work love your stuff.
Maybe it would be easier to glue the mylar to a large cylindrical thing, like a kiddie pool or large water basin, then vacuum the air from the resulting cavity.
That screwed-up earth pic would make a SICK album cover.
Haha exactly my thought
Cigarettes after sex
It’s indeed an amazing image and to think we have it because a guy with fabulous sides glued a emergency blanket to an umbrella makes it even better. Has a good story attached to it.
It’s been released to the public so it’s a free image
You're right, Hello Cleveland we're Squelch
So wanted to say thanks. You got me into this as a hobby not long ago and I've been having a lot of fun exploring it with my kids.
Congratulations, you have recreated the type of folding satellite dish that was used on the surface of the Moon by Apollo astronauts, to return live video to Earth. The ability to fold, portability, light weight, and ease of setup was very important to them... and they didn't have any wind to contend with. Impressive results! You might get better reception if you can find an umbrella with a center "handle" made of fiberglass or some other dielectric. I have a feeling that the aluminum handle on yours may be doing your yagi no favors. Very cool video.
You mean from Stanley Kubricks film studio
@@Crazen2the conspiracy theory is cover up for the fact that NASA funded the missions by letting Stanley Kubrick shoot his films in space to save on special effects costs.
@@asou679 Lol, I wouldn't be surprised, although the special effects were so bad, they looked like they were from the 60's
@@Crazen2The moon landing was in the late 60's.
What i always wonder is why they would need to fake it? I don’t see the point. Also don’t forget that at that time the Soviets where also pouring a massive amount of funding in their space capabilities. And ofcourse in intelligence. Combining all that the likelihood of the Soviet Union finding out if it was fake in a 20 year span is not that unlikely. That would have been major.
One way to cut mylar coated plastic foil is by sticking a bit of copper wire in your soldering iron then dragging a u-bend of it across the top of the foil. I use that method for both cutting and heat fusing mylar for blimp envelopes. Or just use your normal soldering iron element held at a slant if you don't mind gunking it up.
Neat! I'll have to try that.
I am pretty sure 3m-super-77 spray adhesive was invented by nasa specifically for applying mylar film for em and thermal reflectance. @@saveitforparts
This reminds me of an old Canadian show, The Red Green show. He made a TV antenna from a beach umbrella and used potato chip bags for the reflector.
If the women don't find you handsome, they should at least find you handy!
So they make higher end photography umbrellas that use an aluminized Mylar lining. That would work better. The other ones are just shiny(ish). They and most “metallic” spray paints use garnet dust for the shininess.
Garnet dust? I don't think garnet dust is shiny - it's basically sand (ground up garnet rock). It's what you use in sand blasters and waterjet cutters. It's not shiny, it's usually red
@@gorak9000"Garnet" covers quite a wide range of crystalline materials, some of which can be opaque and some can have gemstone-like transparency. e.g. YAG (Yttrium Aluminium Garnet) was used as a low cost diamond substitute in jewelry before cubic zirconia, and is used today in lasers and fibre optics devices.
@@ferrumignis Interesting. I never knew what the G in YAG stood for. I think it's also used in microwave RF components - filters and couplers or circulators. It has some unique properties! I didn't know being reflective / shiny was one of them! Or maybe that's YIG, and YAG is mostly for optics / lasers
@@gorak9000 yeah, you’re right. Mica maybe? I know it’s a mineral.
@@gorak9000 In addition to being a very hard material, garnet is a beautiful gemstone that comes in a variety of colours. Interestingly, for centuries, it was believed that garnets came in all colours except blue. I believe blue garnets were recently discovered, but I could be wrong. Also, an alternate name for garnet is carbuncle. And that's why the titular 'blue carbuncle' from the Sherlock Holmes mystery was so special!
I still have a few emergency blankets from the 90s they have much a thicker metal layer. its so thick it can block all signals when I wrap my phone into it
I make hats with that stuff.
When they do a MacGyver reboot, it should just be called "Gabe". ;)
I hope I get a spot on the next Stargate show afterwards! 😂
Under rated channel on RUclips .
I agree!
I know little about the subject matter but I like this channel.
Dude…NEVER apologize on the cat’s behalf…we “get it”.😅
Whos Cat? What Cat? Seriously, I Didnt See Any Cat !
Best youtuber on youtube right now hands down. thank you
I think you could just put the space blanket (or other metallic layer) on the outside of the umbrella. Your first experiment showed that the umbrella cloth is rf transparent. It may be easier to fold down the umbrella if the metal's on the outside - less harsh angles when collapsed. Plus it should be easier to apply since you don't have to work around the spokes.
That's what I would have done.
The SDR radio is £54 GBP (over $70) here in the UK, but I am going to get one next payday thanks to you and your easy to understand videos. Great Channel-
Great video as always. Maybe you could try a steel screen door mesh and cut it with a box cutter along the ribs of the umbrella so it can fold nice and easy. Might try it myself now that you have sparked my brain with this video.
aluminum screen is cheaper, lighter, and easier to cut :) Actually, I don't even think you can get steel screen mesh - at least not for windows - it would rust the first time it rained.
Awesome stuff. Beyond the extraordinary astrophotography that is in reach of most these days is planet sized collaborative interferometer astro radar. Time to make it happen.
Maybe a metal anti mosquito mesh would also work, but IDK about the holes in it. The advantage of it is that you can sow it into the umbrella and that it being a mesh makes it actually bendable.
I just suggested that too
Wavelength at 1.7GHz is 17.6cm, and to be effective as a reflector the holes must have a diameter well under 10% of the wavelength (1.76cm or very approximately 2/3 inch). If your mosquitos are bigger than this I want nothing to do with them 😂
@@ferrumignis I've seen mosquitos that large, but they don't bite and are quite funny to watch trying to evade you. They are unbelievably flimsy and clumsy
Better yet remove the cloth from the umbrella and replace it with wire mesh.
The mylar sheet worked! Brilliant.
Thanks for your vids. Perfect level of interesting technology without getting too deep in the weeds. Enough that gets my brain ticking and encourages me to research .
Oh, and I might of accidentally ordered a SDR dongle . 👍😉
Been wondering about this for a time but never got to testing. It's a build and wait game, takes a lot of patience, respect! Great SDR project!
A photography silver umbrella reflector. Cheap & easy
Neat, that text data at 8:21 is instantly recognizable as METAR data from Airports. From all over the country too; KBBD Brady TX, KBDU Bolder CO, and KBGE Decatur Georgia to point out a few.
Awesome to see all this tried anyway.
Nice idea 😊😊
Great video, thanks for going through all the hassle to record this for us!!
Made me happy to see how well that worked. I have seen some 3d printer fume tent boxes on linustechtips that had a flexible yet very metallic looking interior. They seemed tough. Makes me wonder if that stuff could replace the cloth of a regular umbrella.
I thought about this for 20 years, thanks for trying it :D
Such a great channel.
Watched like 10 of your videos, I subscribed today because of the DiY stuff 🙃
As a robotics engineering student this is the kind of stuff that is cutting edge that I draw inspiration from for projects. 🙃
What you said at the end is exactly why i appreciate this channel so much, that and just your honesty and genuine enthusiasm. I must admit that i don’t understand half of what your doing when it comes to all the software but it’s the professionally winging it that’s really inspiring to see. Case and point of when you know the rules your can bend them.
(Not in a legal way but as in if you know how stuff works you can do stuff with it like you do.)
Maybe try spray adhesive and brass flyscreen (its not too expensive and much more flexible than stainless flyscreen), would be much more conductive than the blankt. Also painting on contact adhesive thinned down with automotive thinner work much like spray adesive (better coverage for the price), also applying to the outside not the inside should fold up much better. But cool video, great to see.
Remarkable. Great stuff man.
Neat! I've wanted to make or invest in a ball mill so to be able to more cost effectively make my own conductive paints. Not only for similar antenna related projects; PCB's, flexible fabric paint for RDF clothing gear and other sensor potential, shielding, etc. repair projects.
Great vid!! Maybe try some genuine foil glitter and then dust the umbrella with it after spraying it with the adhesive.
This is the guy i wanna team up with when the apocalypse hits
I love these satellite videos!
You did a thing. I use an emergency blanket for my tin foil hat
I need one lol
There is electrically conductive paint that was applied to a model of the Ho229 to simulate the metal parts for radar experiments. They wanted to test the stealth properties of the Horten Ho229. The only drawback of this paint is that it is very expensive as it contains silver. The idea with the rescue blanket is not bad, and the idea of converting an umbrella into a satellite dish is also not bad, so I have a multifunctional umbrella. There is also zinc spray, which is 99% zinc and electrically conductive, which would also be worth a try. I saw a RUclips video of a Russian who built one of the largest 3D printers in the world for plastic, on which you could print individual segments to build a backpack-portable satellite dish. To have internet everywhere via Starlink on the hunt for Bigfoot.
You. Are. Awesome.
Wow, susper inspiring!
Thanks 👍
Boss level experiment!
I found very interesting, mading antenna for satellite with umbrella
An other great video! Nice to see your channel getting traction, keep the content coming, its going places!
This is very cool! I'm trying to build an umbrella-based discone antenna. For that just wire attached to the spars would be fine.
This was cool. The hurried wrinkled application represents what it would really be like, in an emergency, needing to get that signal having been wrapped up in a marathon blanket after the James Bond mission _(peeling off the blanket to avoid creases and then fashioning an adhoc brolly dish like that)._ A "ParaBrolla" could be its name.
There would be people finding the concept of making it ever the moreso cheap and retrofitted (upcycled) from various qualities of mylar or, instead, that much cheaper atomised aluminium spray onto plastic rather than the mylar that is pricier which has foil betwixt 2 plastic sheets. At some point, even though the glued brolly fashioning technique makes a different, the atomised aluminium versus high quality mylar would in some cases be worse but good enough to still be workable, doable, and inexpensive. Radio dishes are interesting because a carrier signal _(either by the style of digital, like FPGA versus Phase-Locked-Loop)_ help the tolerance of getting a signal done and dusted onto a rig and stored as data.
My comment has no hate in it and I do no harm. I am not appalled or afraid, boasting or envying or complaining... Just saying. Psalms23: Giving thanks and praise to the Lord and peace and love. Also, I'd say Matthew6.
Thanks I would like to see more of this stuff😎😎
This guy is Mr.Q!.......and thats about how to work in the Q branch...thx for the vid.
When I saw the thumb I was thinking Gabe is going after that Russian satellites S-band downlink !
13:09 - Great video as always Gabe. I’ll keep an eye out for one of those emergency blanket, umbrella and spray adhesive shops while I’m out later on ;-)
Kitchen foil is probably better, but whatever you use, I reckon that it’s a one-way thing in terms of being able to fold it up again.
I still think foil HVAC tape worked better and was easier to apply smoothly, but I couldn't fold up the dish again with that! I did get a decent signal with a smaller diameter umbrella using the foil tape.
Another awesome vid. My fav content.
One thing to keep in mind is that an LPDA has a hair too much gain for really deep dishes like your umbrella. The feed will only "light up" the central perhaps 40-50% of the reflector. In fact, feeding really-deep parabola is a bit of a black art. That's why you'll find sat dishes typically in the F/D range of 0.3 to 0.5.
It's not really a black art - a simple waveguide feed with an adjustable choke ring around it to adjust the angle of illumination, is pretty universally used on all large parabolic dishes
A simple waveguide feed (with or without a choke-ring to adust pattern) simply has too much gain for dishes with F/D
Hopefully umbrella manufacturers are watching and realize there might be a market for ones made with a durable reflective material.
They're also flexible solar panels and there have been attempts to make solar panel umbrellas in the past, including myself, I'm sure patents have expired by now.
Fun video. Good idea
The problem with Mylar, is it is a real metal surface. But it’s as close to a single atom thin as possible. Satellites use Mylar as faraday protection, but it’s a special gold Mylar. Also with shorter wavelengths, every wrinkle starts to matter. I think a far more difficult, but far more effective solution would be to cut off the fabric, and use it as a template to sew together a new cover out of Faraday fabric, or an ultra fine metal mesh if you can find it. Also cut a true parabolic curve out of cardboard to bend the frame into a more accurate shape while it’s off.
The question is, would a standard yagi antenna be just as or more effective? Yagi antenna are simple to build also but are technically horizontally or vertically polarized so perhaps the parabolic collector is better.
@@mrbyamile6973 I haven’t looked into dishes much. But it’s probably significantly more effective than a Yagi alone. Otherwise satellite command stations would just be using Yagis by themselves. I think the antenna still uses a Yagi because it has great rear and side nullification.
you can use that mylar coated umbrella as a solar cooker too!
FWIW: I just rewatched the _'Umbrellabolic Dish'_ video.
I am now watching this one...👍
lol this is my favorite youtube channel now
Great video! I am fascinated by this, and I plan on trying myself. I wonder if automotive headliner adhesive would be a good choice? I'm in Virginia and have seen GOES16 shoot through my telescope view quite often, then I look by eye. I enjoy watching satellites disappear into darkness when they cross the day terminator. I followed Tiangong One for about a year until it fell to Earth. It's a good thing we are not neighbors! Your ingenuity is truly inspiring, thank you.
You could also try and use a cooking wok to use as a satellite dish. also is the version 4 SDR dongle better than the version 3 one ?
The v4 is pretty similar, I think it has a slightly different frequency range and lets you see lower frequencies, but I haven't had the occasion to use that yet.
Thanks for that ill have to get one.@@saveitforparts
you are welcome
There is probably a better option for C band dish alternatives: the solar cookers. A 1.5m solar cooker is much cheaper than a 1.5m dish antenna.
So this is totally random, but I work at a glue factory and one of the things people have trouble with is spray-on glue. It's really easy to not end up with enough adhesive, you need a thicker layer than you think you do.
how many race horses with broken legs does it take to make 1 small bottle of white school paste?? How many horses does it take to make glue stick?? I bet horses hate the start of school season
08:22 That is METAR data that pilots are using to understand what the weather is at destination. KBGE is a airport ICAO Code.
Love the channel and all the cool videos!
Do you think metal fly screen might work (maybe sewn on)?
Could it hold up to folding better?
My brother made a solar cooker out of a metal disk snow sled when I was a kid. I bet you could do that.
Very cool!
Autoparts store sell copper gasket stuff in an aerosol can. Stinks, but I wonder if it would work? It's not paint to be clear, it's used on headgaskets and such as a sealant, but it's liquified copper.
That's actually a pretty good idea. I bet that stuff is pretty expensive though, being copper and all
Yeah, foldable mylar antennas/reflectors has been a thing in space for years.
I have also seen one taping a mylar blanket over a bucket and then draw a slight vacum in the bucket to get a parabolic shape.
It might be easyer to tape a mylarsheet to a ring and make a lid from something that does not block the signal and pump it to the correct parabola.
Also you should have aimed for the best signal and then tryed to manually move the antenna to find the focalpoint, that's where the gain is...
I did move the feed around to try and find the focal point, and it seemed best right about where the math said it would be. Still seems weird to me, but it is a pretty flat umbrella.
@@saveitforparts Yeah. then it was only the flatter innerpart of the umbrella that acted as the reflector
If you glued to the out side, I think there would be less cutting required., but for the vents that let the air through.
Amazing job picking up satellite signals with an umbrella!
Can you do it with a stainless cooking/mixing bowl?
I actually have one on the satellite pile that I want to try 😂
You could get some larger plastic dish shaped put the space blanket over it seal the edges pull a vacuum to get the shape you need
You should have cut the blanket to each individual panel of the umbrella.
Also, if a spray can is empty, remove the spray nozzle and jam the end of an air compressor on the actual nozzle of the spray can. Like refueling a torch.
If you get a tire air stem (the tapered rubber part) and keep the air valve in it, it presses down on the nozzle, but stops the air blowing back out. The air stem base fits in the circle on the top of the can. Give it a shot. They can be bought at any local tire reseller for between 3 and 5 bucks. Just make sure it has the valve in the stem.
If he had two of these umbrellas that were exactly alike and he didn't mind sacrificing one, he could carefully use a seam ripper and take it apart... and use the pieces of cloth as a pattern to cut mylar exactly to shape. These are a fairly complex shape that is not triangular (called a "gore") that you will see on hot air balloons. It's more complex by the fact that it is not on a perfectly parabolic curve.
I don't think the color silver is as important as the conductivity. Maybe some copper bottom boat hull paint or some other conductive paint may work better?
Looking at actual photography reflectors, I think it's worth trying to get your hands on one of these. All the ones I'm seeing have many more ribs so they're a closer approximation of a circle, and do not have the kink half way along the ribs, so they overall do actually try to approximate a parabola; where this one is just sort of vaguely similar to a parabola. Also seeing ones that are much deeper parabolas if that matters, you mentioned this being really shallow. The approximate parabolic nature of the reflector is important in photography because the goal is to create a light source that is coming in fairly parallel from a large area, it casts different shadows, more daylight-like shadows. They also look far more metallic, nearly to the point of having a reflected image (and they're huge, silly huge, 7'+). They are expensive is the thing. Maybe someone in the area can lend you one for a video. Unless you think you'd use one for your video, or for shop lighting, I don't think it makes sense to spend this much on one video.
Gold leaf? Vapor deposition? You think you could electroplate the inside of that umbrella? I really like the idea of a lightweight, portable, durable parabolic, but durability seems like the kicker. I was really hoping the paint would work.
Good video. Would like to see if maybe the focal calculation was off. Moving your feed horn in and out and seeing the difference.
If you don't mind sharing, what camera and editing software do you use. I take video of my project, but hate to edit.
I did try moving the feed in and out, and that was where it worked the best. I use a Canon Vixia I got from @GardenforkTV and I use Shotcut on Linux for editing.
Good video
Get two of your pcb antenna's and one of those cheap network analyzers and measure transparency by looking at signal with and with out the test sample. The reflection ignoring losses then is R=1-T. So if tran is 25% then the R is 75% more or less. I would use copper tape for a reflector. maybe alu foil.
I used aluminum tape for the previous one, that worked pretty well.
@@saveitforparts Cu is a better conductor. You can also get Cu with conductive adhesive. That's probably not necessary. In fact Al is probably fine. :)
Age old dream of turning umbrella into dish antenna and mistaking dish antenna for umbrella came true.
"go-go-gadget Satcom!" 🤣🤣🤣
They make parabolic photography ones up to 48in with a "silvered" inside that might work
What if you put the emergency blanket on the outside of the umbrella? Or both outside and in?
Would be interested to see if anything gets picked up UK side.
Im definitely saving this video for the Zombie Apocalypse!!!
BTW another banger. Keep em coming & ignore the trolls. They’re just unhappy because they realized it was their fault their dad left to get milk and never came back….. just sayin
I would have glued smaller sections to keep it smooth, sort of like a disco ball and with a substrate so the mylar panels would be easier to apply. At least have serrated the parts of the flexible webbing so it can bend without tearing the delicate mylar. Anyways, this is all fascinating and has my brain going. It's unfortunate the practical implications are so slim.
I didn't think it would actually work, so I rushed it a little :-P
I wonder if the copper "gasket sealer" (Permatex spray-a-gasket) used on engines is conductive enough to be used as a dish/ground plane.
For a yagi, you'd probably do better with a wave guide set at focal plus 1/4 wave, then antenna..
You can make a simpler antenna drive by manually rotating the antenna to the azimuth of max elevation, pitch an antenna axis to the maximum elevation, then you just need a motor to pivot the antenna on the axis.
Hugs from bohemian forest
what about tracing the umbrella panels onto a fine fabric like mesh?
what if u put the blanket on the other side of the umbrella the fabric should be radio transparent so it shouldnt matter if u cant see the shiny bit, that way you wouldnt need to cut it up and maybe get a more contiguous reflector surface
Good image ❤😊
The Satdump showed KBNW! That’s my home airport!
How about an emergency ('space') blanket over a circular form that you pull a vacuum on? It would be shallow, so the focus would be pretty far out there.
What else other than an umbrella could be use with the emergency Mylar film blankets? What’s stopping you from say making a carboard, ply, or even plastic based antenna. Keep up the epic work love your stuff.
Yes!!!
Maybe it would be easier to glue the mylar to a large cylindrical thing, like a kiddie pool or large water basin, then vacuum the air from the resulting cavity.
Here is an idea. How about a bunch of spray adhesive and a ton of glitter.
Sounds fabulous 😂
I love you so much.
Love the shirt
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