Topband: Vertical choke needed?

[Michael Walker]

Wes

That is an option you have and no one is making anything do anything.  It
is 100% up to you.

Happy New Year

On Fri, Jan 1, 2021 at 1:21 AM Wes <wes_n7ws at triconet.org> wrote:

> Hi Mike,
>
> I've read all of that stuff and more many times.  Frankly, I'm not
> motivated to put a 10 pound lump of ferrite on every wire into or out of my
> shack.  It appears that common-mode chokes and articles about them, have
> become a cottage industry.  I will leave my opinion of the topic at that.
>
> Back to the actual case at hand, a ground-mounted, inherently unbalanced
> antenna, with a bunch of radials.  I contend that the coax outer conductor
> is just another radial.  As an approximation the currents in the radials
> will divide by the number of radials.  Because of its different length,
> there will be asymmetry in the coax "radial" current but it could go either
> way.  So tell me where exactly do I choke this "radial" and why?
>
> Wes  N7WS
>
> On 12/31/2020 8:22 PM, Michael Walker wrote:
>
> Hi Wes
>
> The chokes do a few things.   For transmitting, they keep the RF off the
> feedline.   It is critical for RX and TX.
>
> Just as importantly, they keep RF and Noise off the feedline while
> receiving, and this is what you want.  The quieter you are, the more you
> can hear.
>
> Common Mode Currents can raise make it harder to hear weak signals and I
> have seen and heard this with my own ears, as many others have.  How about
> I reduced my 80M noise floor from S9 to lower than S6.  I'm not sure on
> 160M as I didn't really get going on 160 until after I was loving chokes.
> I now buy them in lots of 50 in bulk from Digikey.
>
> Read these pages.  This is where I started a long time ago
> http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf.
> Well worth the read.
>
> Next, read Jim's stuff  http://k9yc.com/2018Cookbook.pdf
>
> He is part of this group, and I know he will comment at some point.
>
> Mike va3mw
>
>
> On Thu, Dec 31, 2020 at 9:50 PM Wes <wes_n7ws at triconet.org> wrote:
>
>> I have the same situation and no choke.  IMHO the transmission line is
>> just
>> another random length radial.  I don't have chokes on any of the others
>> either.
>>
>> Wes  N7WS
>>
>>
>> On 12/31/2020 5:15 PM, Kenneth Silverman wrote:
>> > Hello, I have an inverted-L and the radials are laying on the ground AND
>> > the coax is on the ground too with radials right near the coax run.  Do
>> I
>> > need a choke to stop any feedline coupling/radiation, and if so, where
>> in
>> > the feedline?
>> >
>> > The antenna is in the woods so burying either the radials or coax won't
>> be
>> > easy.
>> >
>> > Many thanks, Kenny K2KW
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>
>