[Ham-Computers] RFI from computers.

[Loren Moline WA7SKT]

Hello,

I had interference with my 2 Meter reception from my USB wireless adaptor 
and cleared it up and thought I would share this.

It started out that I noticed when trying to do EME I had signals in various 
places in the lower portion of the band and discovered it was from my USB 
wireless adaptor.

I had a ferrite choke so I put it around the cable to the 
transmitter-receiver and it made a tiny difference but not that much..I was 
trying close to the computer. After much experimentation this is what I 
found out about did.

I went up close to the transmitter receiver and put the choke around the 
coil while listening to receiver..it seemed to make some difference so I put 
a second one on and it was doing more good.

What I ended up with is a loop 6 inches in diameter right at the 2.3ghz 
transceiver with 5 ferrite chokes of which one is across coth cables where 
the cable crosses, Now there is not enought interference to cause me 
problems.

Moral of the story....Dont trust that if only 1 ferrite choke doesnt work 
that they are no good..try several and see if that works.


Loren




Loren Moline WA7SKT  CN86cx
Member: ARRL, Pacific Northwest VHF Society #151
2 Meter EME initials = 25
2 Meter EME with 4 X K1FO - 12's, IC-820H, and 380W from TE Systems 1452G