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

[Barry]

While noise reduction may be a factor, I think the real reason for going to a modern filter (or no filter at all) is the fact the old filters trip GFCIs and if you're trying to power your radio from a GFCI-protected outlet, then you need to consider alternatives.

Regards,
Barry - N4BUQ

----- Original Message -----
> From: "Craig Heaton" <hamfish at efn.org>
> To: "Tisha Hayes" <tisha.hayes at gmail.com>, "R390A" <r-390 at mailman.qth.net>
> Sent: Saturday, May 10, 2014 3:39:02 PM
> Subject: Re: [R-390] R-390A FL-101 Line Filter
> 
> All,
> 
> Not to say which is the correct choice, to filter or not to filter
> (FL101).
> Disconnect the antenna; is the receiver quiet? If the receiver is
> quiet with
> the antenna disconnected, my money is on RFI via the antenna.
> 
> Craig,
> 
> -----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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