[RFI] DigiKeyer II

[Dale J.]

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.

GL
73
Dale, k9vuj



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

> On Wed, Jan 1, 2014 at 9:58 PM, CR <ka5s at 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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