Re: Topband: W1FV 9-Circle Feedline & control Line Chokes?
Rich, I don't use any chokes on my 160m 9-circle RX arraylocated about 900ft from the shack. Chokes on the lines of your antenna couldn't hurt. Snap-on chokes may not offer worthwhile resistance. 8, 50-ft radials each element. "W8JI" elements. No Hi-Z elements. I used his "touch-the-feed-line-to the radial ground" to see if there is any change to the impedance at the antenna. NO changes noted. I used 3/4-wl lines on all elements. RG-6 coax. RG11 to shack. Thru-the-coax remote control. See ON4UN's DXing book for a couple of photos. 73, Charlie, N0TT On Mon, 29 Nov 2021 08:13:48 -0500 (EST) Rich Dailey writes: > 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
Re: Topband: W1FV 9-Circle Feedline & control Line Chokes?
On 11/29/2021 5:13 AM, Rich Dailey wrote: 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. The transmitting chokes I designed for KZ1W would also work. They use RG179 on a single 2.4-in #31 core. Table 4 in the transmitting choke "cookbook." The chokes will be most effective if placed at the base of each antenna, with any phasing lines shortened as needed. http://k9yc.com/2018Cookbook.pdf 73, Jim K9YC _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: W1FV 9-Circle Feedline & control Line Chokes?
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
