A couple of .0022 6KV or more, not the China Ebay crap, discs will do it for
10-160.
Ive never used the Russian hockey pucks but have heard other EU and Japanese
versions are not so good on the higher frequencies as many were not made for
QRO RF.
Maybe someone has a guideline on what the markings and applications are.
Carl
KM1H
----- Original Message -----
From: "peter chadwick" <g8on@fsmail.net>
To: "N1BUG" <paul@n1bug.com>; "'Amps'" <Amps@contesting.com>
Sent: Thursday, October 17, 2013 10:21 AM
Subject: Re: [Amps] Question on by-pass capacitor TYPE
Paul,
Polyester film caps aren't that good, because generally, they have too
much inductance, the dissipation factor is high so they cannot carry much
RF current, and even a 0.1 microfarad ceramic disc with negligible
internal inductance but a half inch lead each end will be resonant at
about 3.5 MHz. Above there, it all looks like an increasing impedance with
frequency.
Inductance and dissipation factor are the real problem.
73
Peter G3RZP
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
-----
No virus found in this message.
Checked by AVG - www.avg.com
Version: 10.0.1432 / Virus Database: 3222/6257 - Release Date: 10/17/13
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|