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 <[email protected]> wrote: > I'd guess that you're probably fine without the choke. > > 73, Jim K9YC > > On 5/28/2020 11:06 AM, [email protected] 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 <[email protected]> On > > Behalf Of Jim Brown > > Sent: Thursday, May 28, 2020 1:37 PM > > To: [email protected] > > 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 > > _________________ > > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > > > > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
