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Re: [RFI] Keyboard

To: Joe <nss@mwt.net>
Subject: Re: [RFI] Keyboard
From: GaryK9GS <garyk9gs@wi.rr.com>
Date: Sat, 03 Mar 2018 09:47:21 -0600
List-post: <mailto:rfi@contesting.com>
A better idea would be to fix the RF getting into the keyboard in the first 
place.  That's not normal.
What kind of antenna are you using?  Does this happen on only some bands?  At 
any power level.


73,
Gary K9GS
-------- Original message --------From: dalej <dj2001x@comcast.net> Date: 
3/3/18  9:32 AM  (GMT-06:00) To: Joe <nss@mwt.net> Cc: rfi@contesting.com 
Subject: Re: [RFI] Keyboard 
I’d use a #31 mix snap-on and wrap several turns though it.  I purchase mine 
from Mouser.  I don’t have the PN handy but if you need it let me know.  

Those from RS I don’t count on to do a good enough job.  

73
Dale, K9VUJ



On 03, Mar 2018, at 9:24, Joe <nss@mwt.net> wrote:

Is RF getting into a keyboard issue OK here, it is RFI in a way..

OK, Say you get RF into a USB keyboard. It just stops working and the only way 
to get it working again is a total re-boot.

I'm assuming the best option is ferrite beads on the cable.

Now question, where is the best placement of the beads. Keyboard end? Computer 
end?  BOTH?

I have two here, a small one where I could get one or two passes through the 
hole. ( it is a Radio Shack split thing )

and then a much larger one, also split,, but the hole is close to a inch ID. so 
I could do many turns.

What would be best to put where?

Joe WB9SBD
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