Date: Fri, 30 Mar 2018 07:22:18 -0400 From: "N2TK, Tony" <tony....@verizon.net> To: <topband@contesting.com> Subject: Topband: 160M Balun
<I shunt feed my tower for Topband. Presently using a Comtek 100 bead balun. <After reading K9YC's article on baluns it would seem that a stack of five #31 cores with 7 turns of coax would be a better balun. <Would I notice an improvement in any way by switching baluns? <If the answer is I would notice an improvement what about using sixteen <turns #12 THHN wire on #31 core as shown in K9YC's article? How many cores <would I need for 1500W? <Tnx for any feedback <N2TK, Tony ## Although 7 turns of 213 sized coax through 5 x type 31 cores works good on 160m... aprx 5 k ohms, the choke will resonate on 3 mhz ! You cant get more than 7 turns of coax through a 2.4 inch OD / 1.4 inch ID core. The 160m CM choke needs to resonate lower in freq. It requires more cores to shift the res freq down. I dont know how many more, but I suspect 7-12 cores would do the job, and certainly be an improvement. You wont blow it up either. ## I suspect your current bead balun wont provide very much Z on 160m..and it will all be reactive. Jim VE7RF _________________ Topband Reflector Archives - http://www.contesting.com/_topband