Mike and Jim Thanks for posting this good info.. Timely for me anyway. Fred KB4QZH
---- Mike Waters <mikew...@gmail.com> wrote: > ---------- Forwarded message --------- > From: Jim Brown <j...@audiosystemsgroup.com> > Date: Mon, Jan 21, 2019, 11:36 PM > Subject: Re: Topband: Inverted L improvements - Part 3 (now with data) > To: Mike Waters <mikew...@gmail.com> > > After nearly a year of work, I published a new "cookbook" last month. > For reasons that are detailed in the accompanying text, I no longer > recommend coax wound through multiple cores. > > The short answer for "why not?" is that it's simply not practical to wind > chokes that way and get anything close to the same result every time -- > turns must go through the core in the same order, a scrambled turn cancels > a turn, turn diameter matters a lot, and so on. > > The new cookbook uses RG400, 12-2 Teflon/silver pairs, or 12/2 THHN or NM > pairs, all tightly wound around a single core. There are recommendations > for chokes in series to increase power handling. There is also data for the > new 4-in o.d. supersized toroids, which are great for 160M. > k9yc.com/2018Cookbook.pdf > > 73, Jim K9YC > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector