[Elecraft] K3S Proper Grounding

[CUTTER DAVID]

I think we are drifting off topic, my apologies, but if you are considering an
ocf dipole you can only prevent common mode currents by use of a double wound
balun, ie 2 separately made chokes connected together as a 4:1.  A single core
version does not properly cancel the common mode current that results in
unwanted radiation from your coax feeder and can make your equipment live to rf.
 A huge amount of work has been done on this subject by DJ0IP and I suggest you
look at his site

http://www.dj0ip.de/balun-stuff/ is a good place to start.

The proof of the pudding is in the eating and I have not seen anyone do real
world measurements like he has on real aerials.  

David

G3UNA

> 
>     On 30 September 2015 at 20:51 Jerry Moore <jermo at carolinaheli.com> wrote:
> 
> 
>     What I don't understand is my previous radio didn't affect the TV as far
> as I know (xyl never complained) so it has me perplexed because the radio
> shouldn't matter. As far as the buckmaster ocf, it uses a current transformer
> (auto-transformer )to balance the antenna and match the impedance.
>     Jer
> 
>     On September 28, 2015 1:37:16 PM EDT, Jim Brown
> <jim at audiosystemsgroup.com> wrote:
>     >On Mon,9/28/2015 9:35 AM, dw wrote:
>     >> If a tuner is located at the rig-side of the coax, and the coax is at
>     >> high SWR, it could possibly be a cause for coax radiation.
>     >
>     >It doesn't work that way.
>     >
>     >Radiation from coax is the result of IMBALANCE in the antenna. A
>     >ferrite
>     >common mode choke at the feedpoint can fix that.
>     >
>     >73, Jim K9YC
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