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Re: [Amps] Mica cap substitute \ alternative

To: R L Measures <r@somis.org>, Tom W8JI <w8ji@w8ji.com>
Subject: Re: [Amps] Mica cap substitute \ alternative
From: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>
Reply-to: g3rzp@g3rzp.wanadoo.co.uk
Date: Tue, 11 Jul 2006 09:39:22 +0200 (CEST)
List-post: <mailto:amps@contesting.com>
Rich said:
>Indeed, and frequency counts too since mica dielectric needs to be  
derated above 5MHz.<
What goes wrong with mica above 5MHz? it got used a lot in receiving and 
transmitting tubes, and as insulation in cavities at VHF and up where quite 
large RF currents were flowing. And as windows in tubes feeding wavguide, 
carrying appreciable power (like MW pulses). Is it just the wya mica capacitors 
are made?
73
Peter G3RZP
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