You can make a feedline choke with snap-on ferrites as follows: wind 4 turns of the feedline through 5 snap-on cores of Fair-Rite part #0431176451. The core has an inner diameter of about 3/4 inch and 4 turns of RG-6 is the limit of what will fit in the core. However, using 5 cores will provide a large total choking impedance (~10 kohm) on 160. A larger core will accept more turns but at significantly more cost for the cores. The advantage of making chokes with RG-179 wound through smaller cylindrical cores is the much lower cost, although it's a bit more work to make these chokes.
73, John W1FV -----Original Message----- From: Topband [mailto:topband-bounces+john.kaufmann=verizon....@contesting.com] On Behalf Of Rich Dailey Sent: Monday, November 29, 2021 8:14 AM To: topband@contesting.com Subject: Topband: W1FV 9-Circle Feedline & control Line Chokes? Homebrewing a 9-circle vertical array, and I'm looking for opinions from other 9-circle users on what chokes you're using on the feedlines (rg-6) at the switch box, and on the control line. I can go the binocular core route with rg-174, as per W1FV's article, but would prefer the simplicity of several turns through a snap-on choke. tnx! 73 de Rich, N8UX _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
