Hi Jim,
Have you considered using RG-303 or RG-400 ? They're commonly available on the internet and at hamfests at discount prices. Its similar in diameter to RG-58 but rated well over 1500 watts on 160 meters. However... You don't need a high performance choke on your vertical unless you have elevated radials or a sparse radial system with few radials or short radials. A good low impedance radial system will provide excellent common mode suppression. 73 Frank W3LPL ----- Original Message ----- From: "Tony N2TK" <tony....@verizon.net> To: topband@contesting.com Sent: Friday, March 30, 2018 11:22:18 AM 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 _________________ Topband Reflector Archives - http://www.contesting.com/_topband _________________ Topband Reflector Archives - http://www.contesting.com/_topband