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

[David Wise]

> You can get a Corcom 3EHQ or 6EHQ for less than $40 on eBay.

Not right now.  But 3EQ1 and other H-less Q series can be had for less than $20.
That's still less than 0.5mA, an order of magnitude below the standard GFCI trip point.

N, U, and Z series are also pretty good filters and the same price range.
To figure out what will fit, you'll have to download datasheets from TE.com .

Dave Wise

-----Original Message-----
From: R-390 [mailto:r-390-bounces at mailman.qth.net] On Behalf Of Tisha Hayes
Sent: Saturday, May 10, 2014 11:16 AM
To: R390A
Subject: Re: [R-390] R-390A FL-101 Line Filter

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

Corcom 3EHQ1 or 3EHQ3    (Q1 uses lugs, Q3 uses wires).

The 3E means the ampere rating of the Corcom filter. You can also go with a
6E (6 amp) filter).

This is a hospital grade filter (letter designator H) , just about the best
you can find, exceptionally low leakage current.

Here is an excerpt from the Corcom HQ Series Line Filters pdf;

The HQ series power line filters provide the highest
available common-mode and differential-mode attenuation
to RFI noise in the frequency range from 10kHz to 30MHz,
for IEC 60601 and UL2601 patient-connected equipment,
as well as all other electronic equipment that cannot
tolerate any leakage current.
They are a size- and more cost-effective solution to the
problem of meeting both medical leakage current limits and
conducted emissions limits in equipment with high noise
sources (such as switching power supplies).

The 3EHQ filter is rated for 3 A continuous, 10 A peak
The 6EHQ filter is ratd for 6 A continuous, 18 A peak

Leakage current is less than 2 uA. Waaaay below anything that will trip a
GFCI.

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
---------------------------------

Ask yourself this, the radio was designed in the 1950's where the biggest
source of RFI was car ignition systems, maybe the occasional fluorescent
light bulb. The RFI sources today are the hundreds of tiny little
oscillators in every electronic device in your home, switching power
supplies and poorly designed CFL's.

Do you think you need more or less RFI filtering today?

-----------------------------------

You can get a Corcom 3EHQ or 6EHQ for less than $40 on eBay. It is your
choice.



-- 
Ms. Tisha Hayes. AA4HA

*""In this denial of the right to participate in government, not merely the
degradation of woman and the perpetuation of a great injustice happens, but
the maiming and repudiation of one-half of the moral and intellectual power
of the government of the world." -- Fredrick Douglass"*
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