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Re: [RFI] DigiKeyer II

To: Peter Laws <plaws@plaws.net>
Subject: Re: [RFI] DigiKeyer II
From: "Dale J." <dj2001x@comcast.net>
Date: Thu, 2 Jan 2014 15:31:40 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Hi Peter, de Dale, K9VUJ

If you got a computer connected the most likely place at least that I've found 
is the keyboard cable and mouse cable picking up RF and distributing it all 
over connected devices.  I myself have my mouse and keyboard cables wrapped in 
#31 mix snap-in's.  Be sure the snap-on is making good contact at it's mating 
surfaces.  Wrap tightly with tape if the snaps do not seem to close it 
properly.  The two mating surfaces have to come together completely, otherwise 
it's as if it were't even there.  The best of course is a solid ring, but with 
keyboard and mouse cables it's not alway easy to get the USB connectors though 
the ring several times unless you buy a big one, a little more $.  

I've had zero RFI problems with my digikeyer.  They are pretty RFI proof, so I 
don't understand why you are having such a time with it.  That is the nature of 
RFI I guess, it's all black magic…hi, not really, but frustrating at times.

Dale, k9vuj

On 02, Jan 2014, at 15:00, Peter Laws <plaws@plaws.net> wrote:

> On Wed, Jan 1, 2014 at 9:58 PM, CR <ka5s@earthlink.net> wrote:
>> There is an RFI modification for Microkeyer II's below SN 765 that might
>> help.
>> See http://www.microham.com/contents/en-us/d143.html
> Better part of $500 and *I* have to get in there with a soldering iron
> so that it can be used?  I don't think so!  If I wanted to solder
> stuff, I'd make my own interface!
> However, I have a USB Digi Keyer II, not a Micro Keyer II.  :-)
> All my stuff is connected together has the vendor suggests and I
> verified that the PC was connected last evening (it was).  I think I
> mentioned that even with 4 turns of the cable through a #31 toroid
> (the 2.4 or 2.5" size listed in the RFI text) and I still have RF on
> my audio.
> After the net last night I unwrapped it all and then re-did it through
> *2* toroids, a mix 43 and a mix 31.  I have not yet had a chance to
> test on-air.
> The suggested test of resistance between the DB-15 shell and the USB
> connector is an interesting one.  It should be pretty close to zero
> ... I think the vendor suggested it should be < 5 ohms.  I plan to try
> that tonight if I have the energy after license testing.
> -- 
> Peter Laws | N5UWY | plaws plaws net | Travel by Train!
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