I also build all my own workstations. Only my server is a factory unit.
(Dell)
It has been my experience, the main cause of RFI is the power supply. I
have never had a monitor (LCD/LED) generate any RFI. My radio sits right
over my desk's workstation. The amplifier (Henry 2KD Classic/export) is
right next to the computer.
I have ***NO*** RFI what-so-ever. (from this setup.) A year or so ago, my
then new, (Now gone!!) , next door neighbor had Best Buy, deliver a big, 70"
Plasma TV. Uh Oh, trouble in River City!
L Yup, It ripped the shreds out of my RF signal.
So...I suddenly had many, MANY, 6 meter conversations with a good friend in
the next valley over, who is a 6 meter aficionado, (sic) during prime time
television. We were getting ready for the, then, upcoming 6 meter windows
of opportunities! J
3 days later, the Best Buy truck was back, with a different TV. An LG 70"
LED model. The plasma was boxed up and loaded back into the delivery truck.
No more RFI!!
(I just love 6 meters. Best plasma RFI cure around! J J J )
Joe - W7RKN
-----Original Message-----
From: RFI [mailto:rfi-bounces@xxxxxxxxxxxxxx] On Behalf Of Kenneth G. Gordon
Subject: Re: [RFI] A source of RFI
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 components.
> 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.
Agreed.
> 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.
Exactly.
> 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 week.
Ken W7EKB
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