[R-390] Line Filter Replacement

[Barry]

The filters are available through Mouser (and other places):

http://www.mouser.com/search/ProductDetail.aspx?R=857-03%2f047virtualkey5621
0000virtualkey562-857-03%2f47

I used a 3 amp model as the original filter is rated at that (and it
happened to be what I had on hand).

I did make a couple of extra brackets.  If the demand is great enough, I
might could make some more.  They're going to be a bit high, though, as it
takes a while to machine those things by hand and the material itself isn't
all that cheap.  I bought a foot to make the first prototypes, but the
material would be cheaper if I bought 3 feet or more.

Barry - N4BUQ

> Barry,
>    Nice work!    And the price for each unit, ready to install is????
>
> Bruce
>
> -----Original Message-----
> >From: Barry <n4buq at knology.net>
> >Sent: Nov 11, 2006 2:58 PM
> >To: R-390-List <R-390 at mailman.qth.net>
> >Subject: [R-390] Line Filter Replacement
> >
> >The subject of leaky line filters has come up on this list several times
> >over the years.  Most of us are aware of the danger of the "hot" chassis
> >they present, how they will trip GFIs, etc.  The radio can be run on an
> >isoloation transformer, but a good transformer can be expensive.
> >
> >One solution is to replace the filter with a modern line filter that
doesn't
> >have the current leakage problems of the original filters, but finding a
> >replacement that will fit without modifying the chassis seems to be
> >impossible.
> >
> >While it's not as elegant as I'd really like, I think I have a solution.
> >Point your browser to:
> >
> >http://www.knology.net/~thelanding/LineFilter/
> >
> >As you can see, the modern filter fits neatly into the custom-machined
> >housing, and the modification is completely reversable.
> >
> >I didn't like having to splice the neitral wire on the right-hand side,
but
> >it would have required me to pull some of the wire out of the harness to
> >make it reach the new filter and I didn't want to do that.  If you know
> >where I can get some of the old-fashioned solder posts (the round type
with
> >#6-32 internal threads), please let me know.  I found one place, but they
> >are very expensive and I can't seem to get the guy to respond to my
emails.
> >
> >Regards,
> >
> >Barry - N4BUQ