[R-390] R-390A FL-101 Line Filter

[Bill Hawkins]

Tisha,

If these filters have such high reactance (low current) to ground at 60
Hz, there's not much capacitance where filters normally have
capacitance.

Does this explain the relatively low line to ground attenuation? Why is
the line to ground attenuation less at higher frequencies?

IMHO, the original filter does not leak, it has enough capacitive
reactance to ground to trip a GFCI.

The problem of shocking the operator goes away if the radio is properly
grounded. If it is properly grounded, there is no need for a GFCI.

Does anyone know the attenuation specs for the original filter?

Bill Hawkins

P.S. Actually, the filter was designed to reduce the RF produced by
adjacent transmitters. That interference is way beyond today's sources.
The problem with them is that they get in through the antenna.

Again, IMHO. I've been wrong before, and can probably do it again.


-----Original Message-----
From: Tisha Hayes
Sent: Saturday, May 10, 2014 1:16 PM

I have been a long-time advocate of replacing the line filter with a
higher grade component.

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Line to ground attenuation is between 44 and 10 dB .5 to 30 MHz Line to
line attenuation is between 75 and 60 dB, .5 to 30 MHz