Hi Trevor, Luis IV3PRK has good info on DHDL, based on the original by George Wallner, AA7JV See http://www.iv3prk.it/TX3A-DHDL.htm
I use a 1200 ohm terminating resistor; source resistance is about 900 ohms. 900/75 = 12 so turns ratio to match is 3.5:1 I use a 2 turn primary and 7 turn secondary on a BN73-202 core. Make sure that you have a feedline choke near the feed to the DHDL so you don’t get common mode noise. They work well! > On 28 Nov 2017, at 15:07, MR TREVOR DUNNE <[email protected]> wrote: > > Hi All > > My quest to better my station continues I want to try a DHDL can someone > recommend a matching Transformer and what size termination resistor should I > use, > > I have some bn73-202 cores and I wish to use 75ohm feed line, > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband — Jeremy Maris G3XDK / G4AQG _________________ Topband Reflector Archives - http://www.contesting.com/_topband
