[RFI] A source of RFI
Kenneth G. Gordon
kgordon2006 at frontier.com
Tue May 30 12:16:45 EDT 2017
On 30 May 2017 at 6:20, Roger (K8RI) wrote:
> I know this sounds trite, but get a good computer.
I've got one. I build all my own computers (6 in the house so far) and always use top-notch
> I'm running two
> monsters in full size, steel tower cases within 3 feet of the rigs, USB
> cables and standard serial cables (com1 and com 2). I have no
> interference and no chokes on any of the lines. The 75/40 sloping
> dipole is about 60 feet from the computers. O
> Desktop computers (PCs) typically use plastic cabinets and inexpensive
> power supplies. The same goes for network interface cards.
> It's often not just the cables that radiate, but the computer itself
> with the plastic cabinet makes for no attenuation to signals from inside
> the computer.
Yes. Mine are all steel.
> Jim Brown (K9YC) has an excellent page on grounding and choking, but
> with plastic cases...who knows.
> Antennas are 60 feet of more distant, but a fire in the RX coax
> connector doesn't hear the computers either.
My antenna (the only one I presently have) is at least 50 feet from my transmitter/shack.
It appears that all my present RFI is coming from the monitor. I'll get that fixed later this
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