[Elecraft] K3S Proper Grounding

[Gene Gabry]

Good information David. I also Have a 80m OCF
http://www.slickpic.com/users/GeneGabry/albums/N9TFHamStationPhotos/?wallpap
er
<http://www.slickpic.com/users/GeneGabry/albums/N9TFHamStationPhotos/?wallpa
per&viewer#8644290> &viewer#8644290

and choosing the correct balun and RF choke is paramount. I went with the
(W2FMI design) Com-BAL-41130ET 4:1 current balun. A bit pricy at $100.00,
but worth every buck. I also added a 10 turn RF choke at the feed point.
Absolutely no RF back to the shack on any of the 7 bands it is resonate on.
Only running 100 watts, but antenna is low hanging at 35' with only about
50' of coax feeding from shack. 

 

73 Gene N9TF

 

K3S 10057

 

>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/> 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 <
<mailto:jermo at carolinaheli.com> 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 

> < <mailto:jim at audiosystemsgroup.com> 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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