[R-390] Caps

[David Wise]

I'm having trouble with your statement below, Charles.
Here's what I believe.

1. There's no potential for distortion; the reactance is only 35 ohms.
2. Ceramic leakage is innocuously low.

I don't know about their reliability.  I suppose it depends, same as for film/foil.
Really, I don't care what the dielectric is, or the packaging, as long as

 (a) it WON'T EVER HURT my filters!
 (b) it will fit, 
 (c) it doesn't cost a week's wages, and
 (d) I can get them.

Give us a few makes/models, and we'll call it a day.

Dave Wise
SWL in Hillsboro OR

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Charles P. Steinmetz
Sent: Monday, April 29, 2013 11:55 AM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Caps

Barry wrote:

>Could a healing event(or series of events) take out a mechanical filter?

Yes, definitely.  And note that C553 is a signal-coupling cap, so it 
is one of the locations where a disk ceramic is contraindicated, due 
to leakage and distortion (a ceramic in this location causes enough 
distortion to change the IF harmonic output measurably).

Best regards,

Charles








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