One way to tell if a choke is needed I would think, is to add say, a random
lenght of coax, 20 - 40 ft, to the shack end of you coax and see if your
SWR changes. If so, then a then a choke could help.
Jim, does this sound like a reasonable test? I'm no expert on vertical
antennas, just my experience.
Ray,
N6VR/W7YA
On Thu, May 28, 2020, 11:42 AM Jim Brown <jim@audiosystemsgroup.com> wrote:
> I'd guess that you're probably fine without the choke.
>
> 73, Jim K9YC
>
> On 5/28/2020 11:06 AM, tony.kaz@verizon.net wrote:
> > Hi Jim,
> > In ground radials - 60. Length 60-100' depending on direction due to a
> close
> > in stone wall in one direction.
> > All the coax is buried and all the shields are tied to the tower legs
> about
> > a foot up the tower after the leave the ground.
> >
> > N2TK, Tony
> >
> > -----Original Message-----
> > From: Topband <topband-bounces+tony.kaz=verizon.net@contesting.com> On
> > Behalf Of Jim Brown
> > Sent: Thursday, May 28, 2020 1:37 PM
> > To: topband@contesting.com
> > Subject: Re: Topband: 160M shunt fed choke
> >
> > On 5/28/2020 8:57 AM, tony.kaz--- via Topband wrote:
> >> Is there a potential benefit to adding a ferrite core choke for this
> >> type of setup?
> >
> > What do you have for a radial system? That's the primary determining
> > factor. The choke prevents the coax from being used as a radial. If you
> have
> > a robust radial system, that's far less of an issue.
> >
> > 73, Jim K9YC
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