[RFI] Question about excess cable length & RFI

[Dave Cole (NK7Z)]

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
>>>>
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>>>>
>>>
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