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Re: [RFI] Resolving RFI to a DSL Modem

To: rfi@contesting.com
Subject: Re: [RFI] Resolving RFI to a DSL Modem
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Sat, 21 Mar 2015 14:55:43 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Sat,3/21/2015 9:06 AM, Adrian Flynn wrote:
Why not use "Snap on Chokes"?
Put as many in series as needed.

Because snap-ons with a single turn have a low Q (broad) self resonant (lossy peak) in the VHF spectrum, and are inductive in the 1-3 MHz range used by DSL. this makes them ineffective at these frequencies. We're looking for a high value of resistance, not inductance. Study k9yc.com/RFI-Ham.pdf

73, Jim K9YC
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