On Fri, 28 Mar 2008 13:47:11 GMT, "Barrett"
wrote:

I have seen some silver mica capacitors for sale @ 56pF they are, Capacitor
rad silver mica 56pf 400v 1%10mm 273 itt.

I was told that the voltage had to be higher than 6KV and those are only
400V. What is the Voltage that I can use and why?

Hi Barrett,

A lot of this flies on the wings of presumptions. One, is that you
have an 80M dipole being trapped for 40M. If so, then two of them in
series for each trap will work just fine with an inductance of roughly
20 microhenries.

No, you don't need expensive 6KV caps unless you put the wrong
frequency to the antenna - and by wrong, I mean wrong band, not just
slightly up or down band.

The voltage across these traps (with all presumptions being observed)
will vary from 400V to 550V across the 40M band for an ideal antenna
in free space. You probably live on earth, so presumptions are
already beginning to shift.

73's
Richard Clark, KB7QHC