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List:       elecraft
Subject:    Re: [Elecraft] RFI PC Speaker Hum
From:       "Jim Brown" <jim () audiosystemsgroup ! com>
Date:       2010-05-31 22:31:49
Message-ID: 20100531223150.BDF9357D5C () gw1 ! nlenet ! net
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On Sat, 29 May 2010 11:10:39 -0700 (PDT), Brian - N5BCN wrote:

>Thanks for any suggestions!

W4TV has given you great advice. 99.9% of all amplified speakers have RFI 
problems at some frequency, including pro products with major brand names. 
The usual causes are 1) lousy shielding  2) lack of RF filtering on audio 
wiring; and 3) pin 1 problems. W4TV's advice addresses #2 and #3. There's no 
good solution to #1 short of a science project or a bucket. 

As others have noted, you don't need amplified speakers with a K3 (or with 
any ham rig I've used). Ordinary un-amplified speakers work quite well. 

73,

Jim Brown K9YC



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