[Top] [All Lists]

[RFI] FW: [CQ-Contest] Follow-up on RFI and laptop - problem solved

To: <rfi@contesting.com>
Subject: [RFI] FW: [CQ-Contest] Follow-up on RFI and laptop - problem solved
From: "Tim Duffy K3LR" <k3lr@k3lr.com>
Reply-to: k3lr@k3lr.com
Date: Mon, 17 Dec 2007 20:35:47 -0600
List-post: <mailto:rfi@contesting.com>

-----Original Message-----
From: cq-contest-bounces@contesting.com
[mailto:cq-contest-bounces@contesting.com] On Behalf Of Barry
Sent: Monday, December 17, 2007 6:41 PM
To: cq-contest@contesting.com
Subject: [CQ-Contest] Follow-up on RFI and laptop - problem solved

Thanks for all the suggestions.  Problem is solved now and here's what I 

1. Grounded the laptop to the station bus ground - I've always had 
grounded my desktops, but it was easy, attaching the braid to one of the 
case screws.  It required a little thought where to ground the laptop.  
I wound up using one of the 2 screw connections on the external monitor 
This alone let me go from 200W to about 1 KW before the CW acted back up.

2. Ferrites on the USB serial cable - no noticeable effect.

3.  0.01 bypass caps on all the inputs and outputs of my interface box,  
This is a homebrew box for CW, RTTY and voice keying.  It uses 4N33 
optos for switching and as I never had an RF problem before, I never 
bothered with the bypass caps.  That did the trick.  Full power out, no 
more problem.

Thanks again for the suggestions.
Barry W2UP


Barry Kutner, W2UP             Newtown, PA   

CQ-Contest mailing list

RFI mailing list

<Prev in Thread] Current Thread [Next in Thread>
  • [RFI] FW: [CQ-Contest] Follow-up on RFI and laptop - problem solved, Tim Duffy K3LR <=