[RFI] Direct TV DVR problems

[Dave Hachadorian]

2.4" #31 toroids are in-stock, $5.24 each at
www.arrow.com
type 2631803802 in the search box

#31 big clamp-ons are also in-stock, $12.43 each
type 0431177081 in the search box


Dave Hachadorian, K6LL
Yuma, AZ





-----Original Message----- 
From: Jim Brown
Sent: Tuesday, November 02, 2010 1:38 PM
To: rfi at contesting.com
Subject: Re: [RFI] Direct TV DVR problems

On 11/2/2010 1:07 PM, Howard Lester wrote:
> Jim, are you referring to the number of turns required as a
> function of the operating frequency?

I'm referring both to the winding instructions and also the
various
discussions of how RFI occurs and how to kill it.

> And yes, the Amidon ferrites I bought long ago were FT-240's.

They are NOT Amidon ferrites, they are Fair-Rite toroids, with a
VERY
high markup added by Amidon. AND the cores you bought from Amidon
are
almost certainly not #31.   The wholesale cost of these cores is
about
$4 in lots of 100 or more.  Last I heard, Amidon and other ham
vendors
were selling them for something like $15.  Not a fair price.

Appendix One of that tutorial includes advice about how and where
to buy
ferrites and which ones to buy.

73, Jim K9YC

_______________________________________________
RFI mailing list
RFI at contesting.com
http://lists.contesting.com/mailman/listinfo/rfi