RFI
[Top] [All Lists]

Re: [RFI] Question about excess cable length & RFI

To: rfi@contesting.com
Subject: Re: [RFI] Question about excess cable length & RFI
From: "Dave Cole (NK7Z)" <dave@nk7z.net>
Date: Tue, 9 Jan 2018 06:41:46 -0800
List-post: <mailto:rfi@contesting.com>
I had great success in cleaning up my internally generated RFI...  See:

http://nk7z.net/rfi-now-house-cleaning/

for how, and some Spectrum Analyzer, (Elecraft P3), shots of the results.

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 01/09/2018 04:01 AM, Roger (K8RI) wrote:
It's always nice to neaten things up, but EVERY TIME  I have neatened up that mass of cables I have ended up with problems with the station in Breckenridge. http://www.rogerhalstead.com/ham_files/boat1.htm ,

Jim's tutorial would have been a great help back then.  Of course the ferite cores weren't available.

Such has not been the case here in Midland.
http://www.rogerhalstead.com/ham_files/boat8.htm

Here's a partial list http://www.rogerhalstead.com/ham_files/boatanch.htm ; Regrettably, I have no photos of my earlier stations. I just let the excess hang. Often, I just pull enough out of the original bundle to reach.  I've not had to resort to chokes in any leads, except the common mode chokes in feedlines.

If it aint broke, don't fix it!  "IF NEEDED" those chokes work great.

73, Roger (K8RI)

On 1/8/2018 Monday 11:46 PM, Dave Cole (NK7Z) wrote:
I try and coil my excess power cords, etc on ferrite cores...  Maybe 6 to 8 turns, on each core.

73s and thanks,
Dave
NK7Z
http://www.nk7z.net

On 01/08/2018 08:06 PM, Jim Brown wrote:
Hi Greg,

Before you do ANYTHING:

1) Buy and study the new ARRL Book on Grounding and Bonding;
or:
2) Download and study the slides for my tutorial talk on that topic
http://k9yc.com/GroundingAndAudio.pdf

AND

3) Download and study my tutorial on finding and killing receive noise
http://k9yc.com/KillingReceiveNoise.pdf ; (Written tutorial)
http://k9yc.com/KillingRXNoiseVisalia.pdf (Slides for talk at Visalia)

Do NOT cut power cables short -- if the gear is noisy, you may need to use the extra length to wind ferrite chokes. Bonding cables SHOULD be short.

73, Jim K9YC

On 1/8/2018 6:33 PM, Greg Newberry wrote:
Hello all,

I've been following the forum for a while and learning a great deal about RF, RFI, etc. So I'm in the process of cleaning up my ham shack. Putting in a SPG (single point ground) and in general, being pro-active about RFI.

One thing I'm not sure of; what should I do with the excess length of power cords. i.e. A 6ft cord on my computer, but it's only two feet to the outlet. Extra length on wall warts, audio cables etc. ?

Coil them up, bunch them up? I don't really want to cut them all down to length, as I do move things around.

Thanks in advance,
Greg
WB7DUO

_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi


_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi


_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi
<Prev in Thread] Current Thread [Next in Thread>