I just noticed that it was in an April issue of QST. Enough said. 73, Mike www.w0btu.com On Sun, Jun 21, 2015 at 1:37 PM, Mike Waters <mikewate at gmail.com> wrote: > ... There's also a 1983 QST article at > > http://www.arrl.org/files/file/History/History%20of%20QST%20Volume%201%20-%20Technology/QS04-53-Peterson_opt.pdf >