[Elecraft] RE:OT: Alternator line filter

[Steven Pituch]

-----Original Message-----
From: Ken Kopp [mailto:k0pp at ixpres.com]=20

Caution ... are you SURE you're hearing alternator noise and NOT the =
fule
pump noise that Ford PU's are infamous for?  I have one, BTW.=20

If it's indeed alternator noise, take a look (Google) 'NEWMAR'.
They have an extensive line of quality products.

73! Ken Kopp - K0PP
k0pp at arrl.net
or
k0pp at ixpres.com

Hi Ken,
Noise rises in frequency as I press on the gas pedal.  I have also have =
read
about the electric fuel pump noise but haven't detected it yet.

Yes, I have seen the Newmar filters.  They are very nice.  I have seen =
one
for at little as $125. =20
http://www.tessco.com/products/displayProductInfo.do?sku=3D99967&eventPag=
e=3D1
That's why I want to built one myself.  If I can figure out what would =
be a
good toroid core say in the T240 size, I think I can build one as nice =
for
about $30.  I might need to stack three, or put several wound toroids in
series.  That=92s why I was looking for some advice since I am not good =
at
picking out the correct toroid mix from the spec sheets.
There are some toroids recommended by WA1MVX at
http://www.sanantoniohams.org/Tips/whine.htm
They are made by SIFERRIT and are ferrite, 64mm O.D., and type 87 =
material.
http://www.surplusmaster.com/prods/comp/misc1.htm
However, I don't know if a better material is available and I don=92t =
know if
I want to buy 20 of them.

Regards,
Steve, W2MY

--=20
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