Hi Pete,
Unless you're planning more than 30 radials eventually, there's no reason to install radials longer than the 50-60 feet you're already using. This is one of several classic references on the topic. See see Figure 3 and the 160 meter column in Table X: https://ncjweb.com/bonus-content/k3lcmaxgainradials.pdf 73 Frank W3LPL ----- Original Message ----- From: "N4ZR" <n...@comcast.net> To: "topband reflector" <Topband@contesting.com> Sent: Monday, September 2, 2019 7:08:16 PM Subject: Topband: Inverted L redux More as an experiment and a thought-provoker than anything else, I've started adding 50-60-foot, on-the-ground radials to my 135-foot inverted L. In the latest incarnation I'm up to 4 radials. On my ancient MFJ-259B the lowest SWR is 1.3:1 at 1825 KHz, with an R of 77. X=0 (the 259B doesn't give the sign of j) from 1808 to1894, which I assume is roughly centered on the actual cross-over point. With my rudimentary knowledge of such things, I'm guessing that there remains something on the order of 50 ohms of ground resistance to be reduced for efficiency, through addition of radials. Question is, would I profit most by adding another 4 50-60 foot radials, or 2 radials each 100-120 feet? Comments appreciated. -- 73, Pete N4ZR Check out the Reverse Beacon Network at <http://reversebeacon.net>, now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector