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Re: [RFI] Query for the group.

To: Charles Gallo <charlie@thegallos.com>
Subject: Re: [RFI] Query for the group.
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sat, 25 Jul 2015 16:18:19 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Sat,7/25/2015 3:20 PM, Charles Gallo wrote:
Jim, the problem around here with wifi is I can count 14 access points in 
range, so bandwidth is horrible

I've found making my own Ethernet cables, each with a type 31 1/2 inch ID, 
Circa 1/2 long with the 3 or 4 turns I can stuff through works well. My problem 
is living in Queens (part of NYC) wher the houses are all on 40x100 lots, there 
are a metric ton of RFI sources. I can tell when the neighbors are running 
their wash, etc. I can't afford $100s of ferrite for every house within say 500 
feet, and most would tell me to buzz off, so I live with S7 background noise on 
some bands. Killing my own stuff helped, as well as the worst of some of the 
closer neighbors

I know your pain -- I spent 42 years in Chicago mixed residential/light industrial neighborhoods before escaping to somewhat rural NorCal 9 years ago.

Remember though that you don't need to spend big bucks on ferrite cores to choke Ethernet cables for this sort of RFI. Clamp-ons that are 0.5-in i.d. are big enough to choke Ethernet cables. Get together with your local hams and do a group purchase. #43 mix is less expensive than #31, and all you need above 5 MHz. Study the Fair-Rite catalog to find clamp-ons about 1-inch long and at least 1/2-in i.d. You'll start getting quantity breaks with 100 pieces or more. 3/4-in i.d. cores are a bit more expensive, but will handle video cables and many power cables, so you may build more quantity that way. My last group buy was for about 1,000 3.4-in i.d. #31 cores. We paid $2.30 plus tax and shipping. That was more than a year ago.

Try Dexter Magnetics near Chicago.

73, Jim K9YC
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