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From: john larkin <JL@gct.com>
Newsgroups: sci.electronics.design
Subject: Re: Mirror as ground plane
Date: Sat, 30 Nov 2024 08:22:04 -0800
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On Sat, 30 Nov 2024 10:05:47 -0500, legg <legg@nospam.magma.ca> wrote:

>On Fri, 29 Nov 2024 07:59:08 -0800, john larkin <JL@gct.com> wrote:
>
>>On Fri, 29 Nov 2024 08:46:25 -0500, legg <legg@nospam.magma.ca> wrote:
>>
>>>On Thu, 28 Nov 2024 07:16:55 -0800, john larkin <JL@gct.com> wrote:
>>>
>>>>On Wed, 27 Nov 2024 22:08:13 -0500, legg <legg@nospam.magma.ca> wrote:
>>>>
>>>>>On Wed, 27 Nov 2024 12:53:01 -0800, john larkin <jl@glen--canyon.com>
>>>>>wrote:
>>>>>
>>>>>>On Wed, 27 Nov 2024 08:53:41 -0500, legg <legg@nospam.magma.ca> wrote:
>>>>>>
>>>>>>>
>>>>>>>Anyone had experience using metalization on glass (mirror) 
>>>>>>>as a ground plane or shield?
>>>>>>>
>>>>>>>Any data on conductivity etc?
>>>>>>>
>>>>>>>RL
>>>>>>
>>>>>>Why use glass? Why not copperclad FR4?
>>>>>
>>>>>Rugged repeated use - subjected to fire and impact.
>>>>>
>>>>>Will be possibly burning FR4 in contact with it.
>>>>>
>>>>>A work surface.
>>>>>
>>>>>RL
>>>>
>>>>Stainless steel is pretty conductive.
>>>
>>>which glass ain't . . .
>>>
>>>Mind you, they're both just peachy to bend, drill, or to 
>>>work with simple hand tools - luckily avoided here once 
>>>sharp edges are tamed.
>>>
>>>The consideration only came up when the basic material 
>>>showed up, free, begging for safe 'disposal'.
>>
>>Mirrors? We went on a garden tour and one guy had a tiny yard with
>>mirrors on the fences. It looked huge, great fun. He served tea and
>>cookies to the visitors.
>>
>>I'm not interested in plants like Mo is, but the garden tours are fun.
>>One guy near the Presidio has a waterfall in his back yard, Lobos
>>Creek.
>
>A micro-hydro project?

No, but very decorative.

There are only two creeks left in San Francisco... all the rest are
now in pipes underground. Lobos Creek flows into the ocean and Islais
creek intoo= the bay. Islais is two blocks from our house and from my
office, in Glen Canyon, and is flowing now that the rains have
returned.

We have hiking engineering brainstorm sessions in Glen Canyon, which I
think work better that sitting around in a conference room.

>>
>>>
>>>Not sure if the idea might be useful to others, elsewhere.
>>>
>>>RL
>>
>>I recall some sort of conductive glass, antistat level, but you
>>probably don't have that.
>>
>>There are antistat sprays, which I think are mildly hygroscopic, for
>>floors and such. 
>
>Well, I mentioned earlier that dish soap can get films in the
>megohm/square region.
>
>Encourages hygene, too.

And leakage currents?

>
>RL