Hi Pete, 1/4 wave electrical length.
89 feet for two RG-11 solid dielectric coaxes in parallel. 73 Frank W3LPL From: "Pete N4ZR N4ZR" <pete.n...@gmail.com> To: "donovanf" <donov...@starpower.net> Sent: Monday, January 17, 2022 5:12:48 PM Subject: Re: Topband: 1:2 UNUN lengths? 1/4 wave? 73, Pete N4ZR Check out the new Reverse Beacon Network web server at [ http://beta.reversebeacon.net/ | <http://beta.reversebeacon.net> ] . For spots, please use your favorite "retail" DX cluster. On 1/17/2022 11:29 AM, Frank W3LPL wrote: Hi Kenny, A very workable alternative is to use two lengths of 75 ohm coax in parallel. RG-11 is the best choice, but two lengths of RG-6 will also work. No need to coil it up, simply use it as part of your transmission line from your antenna base to your station. 73 Frank W3LPL ----- Original Message ----- From: "Kenneth Silverman" [ mailto:kenny.k...@gmail.com | <kenny.k...@gmail.com> ] To: "topband" [ mailto:topband@contesting.com | <topband@contesting.com> ] Sent: Monday, January 17, 2022 2:18:30 PM Subject: Topband: 1:2 UNUN Does anyone have a drawing on how to wind a 1500w 1:2 UNUN? And what type of core is needed? This is for my 160m vertical which is about 28 ohms. Regards , Kenny K2KW _________________ Searchable Archives: [ http://www.contesting.com/_topband | http://www.contesting.com/_topband ] - Topband Reflector _________________ Searchable Archives: [ http://www.contesting.com/_topband | http://www.contesting.com/_topband ] - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector