William, Thanks for idea. Are you absolutely right - 5uH is too small for 160m.
Looks like I have a wrong toroid. After playing with amidon toroid calculator, I found that 20 turns on T300 will give around 5uH (like mine), T300A-2 will give 45.6uH Regards, Andy - YL2QN On Sun, Jan 17, 2016 at 1:52 AM, William Shanney <wshan...@verizon.net> wrote: > 5.7 uH sounds too low for 160M, I’d want ten times that to keep the > winding impedance >>50 ohms. > > Bill, W6QR > > On Jan 16, 2016, at 3:44 PM, Andrejs Pankins <yl2qn.a...@gmail.com> > wrote: > > > > Hello, > > > > Need your help. For a long time can't get working FCP for my Inverted L. > > > > I'm looking for some way to check quality of my homemade isolation > > transformer. I'm connect primary to 50 Ohm dummy load and secondary to > > Antenna Analyzer. Get reading @1850 Ra=28 Ohm and Rx=34 Ohm. Rx is raised > > with frequency. Inductance for primary and secondary is 5.7uH. > Capacitance > > between primary and secondary is 140 pF. > > > > These reading looks normal or somthing wrong ? I'm expected 1:1 impedance > > transformation without additional Rx. > > > > Thanks a lot in advance for your help. > > > > Regards, > > Andy - YL2QN > > _________________ > > Topband Reflector Archives - http://www.contesting.com/_topband > > _________________ Topband Reflector Archives - http://www.contesting.com/_topband