This looked clever .... needs work ... but a good start ....
http://blog.makezine.com/archive/2008/08/diy_parabolic_mirror.html?CMP=OTC-0...
--> Rob
Too bad it's not parabolic, and probably far from even spherical.
Joe WB9SBD
ka2pbt wrote:
This looked clever .... needs work ... but a good start ....
http://blog.makezine.com/archive/2008/08/diy_parabolic_mirror.html?CMP=OTC-0...
--> Rob _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
At 07:34 AM 8/14/2008, Joe wrote:
Too bad it's not parabolic, and probably far from even spherical.
Precisely. Apparently the author thinks "parabolic" just means some kinda symmetrical concave surface.
This guy obviously isn't an antenna guy.
I've found Make magazine to be a crock in general. Too bad.
agree ..... what would be a good form to start with rather than the bottom of some random water tank??
Assuming you had a proper form ... I think the construction process has merit.
The next step would be to coat the fiberglass shell with something metallic ... foil ... screen ????
On Thu, Aug 14, 2008 at 2:04 PM, Franklin Antonio antonio@qualcomm.comwrote:
At 07:34 AM 8/14/2008, Joe wrote:
Too bad it's not parabolic, and probably far from even spherical.
Precisely. Apparently the author thinks "parabolic" just means some kinda symmetrical concave surface.
This guy obviously isn't an antenna guy.
I've found Make magazine to be a crock in general. Too bad.
Best "form" is probably not to have one. Wasn't there a post recently talking about making a mirror by spinning casting resin in a shallow round dish? Perhaps a good use for that old record (*) player gathering dust in the garage...
Greg KO6TH
(*) an ancient mechanical instrument for storing music in an analog form
----------------------------------------
Date: Thu, 14 Aug 2008 15:59:26 -0400 From: ka2pbt@arrl.net To: amsat-bb@amsat.org Subject: [amsat-bb] Re: DIY: Parabolic mirror
agree ..... what would be a good form to start with rather than the bottom of some random water tank??
Assuming you had a proper form ... I think the construction process has merit.
The next step would be to coat the fiberglass shell with something metallic ... foil ... screen ????
On Thu, Aug 14, 2008 at 2:04 PM, Franklin Antonio wrote:
At 07:34 AM 8/14/2008, Joe wrote:
Too bad it's not parabolic, and probably far from even spherical.
Precisely. Apparently the author thinks "parabolic" just means some kinda symmetrical concave surface.
This guy obviously isn't an antenna guy.
I've found Make magazine to be a crock in general. Too bad.
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_________________________________________________________________ Reveal your inner athlete and share it with friends on Windows Live. http://revealyourinnerathlete.windowslive.com?locale=en-us&ocid=TXT_TAGL...
http://medusa.as.arizona.edu/lbto/tech/mirror.htm
Greg D. schreef:
Best "form" is probably not to have one. Wasn't there a post recently talking about making a mirror by spinning casting resin in a shallow round dish? Perhaps a good use for that old record (*) player gathering dust in the garage...
Greg KO6TH
(*) an ancient mechanical instrument for storing music in an analog form
Date: Thu, 14 Aug 2008 15:59:26 -0400 From: ka2pbt@arrl.net To: amsat-bb@amsat.org Subject: [amsat-bb] Re: DIY: Parabolic mirror
agree ..... what would be a good form to start with rather than the bottom of some random water tank??
Assuming you had a proper form ... I think the construction process has merit.
The next step would be to coat the fiberglass shell with something metallic ... foil ... screen ????
On Thu, Aug 14, 2008 at 2:04 PM, Franklin Antonio wrote:
At 07:34 AM 8/14/2008, Joe wrote:
Too bad it's not parabolic, and probably far from even spherical.
Precisely. Apparently the author thinks "parabolic" just means some kinda symmetrical concave surface.
This guy obviously isn't an antenna guy.
I've found Make magazine to be a crock in general. Too bad.
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Reveal your inner athlete and share it with friends on Windows Live. http://revealyourinnerathlete.windowslive.com?locale=en-us&ocid=TXT_TAGL... _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
That's the idea, though "DIY" is just a little bit of a stretch... :-)
Greg KO6TH
----------------------------------------
Date: Sun, 17 Aug 2008 14:27:59 +0200 From: amvm@skynet.be To: ko6th_greg@hotmail.com CC: amsat-bb@amsat.org Subject: Re: [amsat-bb] Re: DIY: Parabolic mirror
http://medusa.as.arizona.edu/lbto/tech/mirror.htm
Greg D. schreef:
Best "form" is probably not to have one. Wasn't there a post recently talking about making a mirror by spinning casting resin in a shallow round dish? Perhaps a good use for that old record (*) player gathering dust in the garage...
Greg KO6TH
(*) an ancient mechanical instrument for storing music in an analog form
Date: Thu, 14 Aug 2008 15:59:26 -0400 From: ka2pbt@arrl.net To: amsat-bb@amsat.org Subject: [amsat-bb] Re: DIY: Parabolic mirror
agree ..... what would be a good form to start with rather than the bottom of some random water tank??
Assuming you had a proper form ... I think the construction process has merit.
The next step would be to coat the fiberglass shell with something metallic ... foil ... screen ????
On Thu, Aug 14, 2008 at 2:04 PM, Franklin Antonio wrote:
At 07:34 AM 8/14/2008, Joe wrote:
Too bad it's not parabolic, and probably far from even spherical.
Precisely. Apparently the author thinks "parabolic" just means some kinda symmetrical concave surface.
This guy obviously isn't an antenna guy.
I've found Make magazine to be a crock in general. Too bad.
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Reveal your inner athlete and share it with friends on Windows Live. http://revealyourinnerathlete.windowslive.com?locale=en-us&ocid=TXT_TAGL... _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
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An awful lot of work for something that is not intrinsically difficult to do. I find a lot of the Make stuff is like that...
For solar heating/cooking applications (and, by extension, our RF stuff), the mirror doesn't need to be anywhere nearly that accurate anyway. Since we're not imaging things, it's useful if our spot size/circle of confusion is about the same size as the sensor or other object it's aimed at.
Laura Halliday VE7LDH "Que les nuages soient notre Grid: CN89mg pied a terre..." ICBM: 49 16.05 N 122 56.92 W - Hospital/Shafte _________________________________________________________________
participants (6)
-
Franklin Antonio -
Greg D. -
Joe -
ka2pbt -
laura halliday -
mvm