[R-390] A Bunch of Questons About an R390A

[John Kolb]

On Sun, 9 Nov 2003 flderoos@mmmpcc.org wrote:

> And the final question is what should the DC resistance of the
> mechanical filters be?  Three of mine measure 50 ohms for the input and
> output and the other one (8 khz) measures 40 ohms for the input and the
> output.  I think I've seem 40 ohms listed several times, but am
> surprised that I would have three bad filters that measure so closely.
> And, if there were shorted turns, the resistance should be lower.
>

I've measured resistances of both 50 and 40 ohmes on working
R-390A filters - anything in that range should be good. When
checking filter coils, I only check to make sure they are not
open, and that neither coil is shorted to ground.

John
<http://members.cts.com/king/j/jlkolb>