[amsat-bb] Re: DIY: Parabolic mirror

[Greg D.]

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 at arrl.net
> To: amsat-bb at 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.
>>
>>
>>
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