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[AMPS] Capacitor voltage rating?

To: <amps@contesting.com>
Subject: [AMPS] Capacitor voltage rating?
From: F.G.Robertson@open.ac.uk (Fraser Robertson)
Date: Mon, 12 Oct 1998 11:04:36 +0100
I am building a HF LPF to handle 150W.  In a 50R system that equates to 87V
rms, or 245Vpp.

I have some polystyrene capacitors rated at 630V dc.  Would these be ok?
How do I de rate the dc voltage for RF?  Presumably it depends on the
dielectric.  Would I be better off with silvered mica caps, readily
available at 500V dc rating?

I appreciate that the voltage could go higher into a non 50R resistive load.
They seem to get away with very small capacitors in modern black boxes.

73 Fraser G4BJM


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