Re: RF Conductivity of thin Mo film

Mark Fergerson wrote:
> 
> Peter Simon wrote:
> > "Mark Fergerson" <[EMAIL PROTECTED]> wrote in message
> > news:[EMAIL PROTECTED]
[snip]

>    Failing that Unc's sheet could be fitted over the horn.
> That way it'd be smaller and lighter than putting it between
> the thruster and the antenna structure (ISTM that could act
> as a sail, doing bad things to the thrust vector). The
> transport mechanism would produce its own spurious
> reflections though.

Bad idea.  Never drive a bung into the broad end of a funnel.  Placed
before the horn the protective moved sheet intercepts all sorts of
grief that is irrlevant to the radome - and it must be of large area. 
What about badness that comes in through the sides of the mesh horn? 
Placed before the radome the film only intercepts that which is
objectionable, and its area is much smaller.  The mesh horn itself
protects the film from energetic nastiness.  What little Mo sputters
of after all that sturm und drang is intecepted by the film.

When impedence or reflectance grows too large, the film is transported
one frame to afford a clean aperture again.  Nobody is going to assign
an extra five kilos to keep the radome clean.  The answer will be of
small mass, small size, and high reliablility.  Mylar is cheap, Kapton
is survivable.  KISS, as we say on the production floor.

 
-- 
Uncle Al
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