[Elecraft] RFI on K3s

[Marty Koszewski]

I had the same issue.  It was caused by my Powerwerx SS-30DV.   After trying a number of things to mitigate the noise, I ended up replacing the power supply with a Samlex SEC 1235M.  Noise gone.  Problem solved.

Marty - K1MTK


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Message: 20
Date: Sun, 19 Jun 2016 23:55:59 -0500
From: Clay Autery <cautery at montac.com>
To: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: [Elecraft] RFI on K3s
Message-ID: <d758bc65-135d-95dd-c423-88b34ea3e4cf at montac.com>
Content-Type: text/plain; charset=utf-8

I am seeing a repetitive RFI source every 34kHz from somewhere less than
20MHz thru 30MHz plus...

See attached image.  The amplitude alternates high/low every other
appearance.  The overall amplitude is higher or lower depending on the
location within the spectrum....  Almost a sine wave function with a
VERY long period.

Anyone want to hazard a guess as to what is causing it?  I disco'd every
switch-mode power supply in the shack and adjacent rooms (couldn't do
the whole house as the XYL was home).... EXCEPT my Powerwerx SS-30DV PS
running the K3s/P3.

Don't have a battery to run the radio on right now...



-- 
______________________
Clay Autery, KY5G
MONTAC Enterprises
(318) 518-1389



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