David What mix of ferrites are you using?
Mike va3mw On Tue, Oct 21, 2014 at 8:29 AM, david Moes <[email protected]> wrote: > You say a 1:1 balun. What type is it and should it not be preventing > common mode currents? If not Id consider one that will rather than adding > a choke. I bought a commercial 1:1 Balun opened it up and found it to be > just a length of RG8X looped once inside the casing with half a dozen > ferrites around it. What I have done is have ground rods at the base of > the pole. I am using a 10-80 +warc fan dipole that looks a little like a > flattened spider web supported with guyed camouflage tent poles to about 40 > ft I have 6 ferrites on the coax at the feed the ones I got out of the > commercial balun. Then at the base I have several 5 ft copper pipes driven > into the ground around the pole about 5 ft apart all bonded together with > 6 gauge bare copper that is also burred a few inched below the surface > safe from the lawn mower. I have a barrel connector at the base that lets > me connect the shield to this ground I have no common mode issues. at > least I have not experienced any. > > > David VE3SD > > On 10/20/2014 22:28, Dauer, Edward wrote: > >> I am thinking of adding a coiled coax common-mode choke to my system. >> Presently it goes K3-KPA500-KAT500 then 100 ft coax to the base of an >> inverted Vee¹s center support pole (collapsible fiberglass), then 30 feet >> up the pole to a 1:1 balun feeding a fanned 10-15-20 Vee. The idea, for a >> couple of reasons, is to put the choke at the base of the pole, something >> I haven¹t seen discussed in the literature. Two questions I am wondering >> about: 1. The choke would be 100 feet from the tuner and about 25 feet >> from the antenna/balun. Probably not as good as having it right at the >> Vee, but is that compromise worth while? 2. For appearance sake I am >> thinking about winding the coax around the base of the support pole. It >> is 2 inches in diameter but I could slip a 3 inch PVC over that section to >> increase the diameter. Anyone know an algorithm for determining the >> number of turns in the winding if I do that? I would be much obliged for >> any thoughts and suggestions . . . Tnx! >> >> Ted, KN1CBR >> >> ______________________________________________________________ >> Elecraft mailing list >> Home: http://mailman.qth.net/mailman/listinfo/elecraft >> Help: http://mailman.qth.net/mmfaq.htm >> Post: mailto:[email protected] >> >> This list hosted by: http://www.qsl.net >> Please help support this email list: http://www.qsl.net/donate.html >> Message delivered to [email protected] >> >> > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:[email protected] > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html > Message delivered to [email protected] > ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
