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Re: [RFI] A source of RFI

To: "'Kenneth G. Gordon'" <kgordon2006@xxxxxxxxxxxx>, <rfi@xxxxxxxxxxxxxx>
Subject: Re: [RFI] A source of RFI
From: Joe <w7rkn.7@xxxxxxxxx>
Date: Tue, 30 May 2017 10:01:59 -0700
List-post: <mailto:rfi@contesting.com>
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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