[Boatanchors] copper screen

[Ron]

I have copper expanded mesh but better yet a silver plated copper 
expanded mesh.
either one is 12 x 10 inch sheets 10 for $27 shipped.  The copper is on 
a roll so any length is possible.

A few sheets for $15 shipped.
---
Ron


w9gt at comcast.net wrote:
>  Lots of old HF broadcast equipment with windows for viewing the
>   
>> tubes included a layer of copper screen wire (like window screen)
>> attached to the glass, with the screen electrically bonded to the metal
>> case around the perimeter of the window.
>>     
>
> My 1946 BC transmitter has only glass between the tubes and the free
> world, but my largest amateur transmitter from '52/'53 has a very nice
> screen between the 4-250s and glass, chrome plated but painted a flat
> black color so you have to look close to see it. Earlier models like
> the Collins 30K have no screen behind the glass either, so it would
> appear to have come along as TV use became more prevalent with the
> accompanying TVI. Cable and satellite TV have probably negated a lot
> of the issues.
>
> ~ Todd,  KA1KAQ
>
> My Collins 30K-4 has copper screen on the inside of the glass....probably was added by previous owner.  In the 50's-60's time frame there was a great concern about TVI and it is not uncommon to find such shielding added on insides of rigs over vent louvers and other openings as well as viewing windows.
>
> Anyone know where you can purchase copper screen?  It used to be commonly available at the local hardware, but haven't seen any for years.
>
> 73,  Jack, W9GT
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