[amsat-bb] Re: DIY: Parabolic mirror

[mvm]

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 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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>
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