Wouldn’t you connect the secondarys in series and the primaries in parallel?
Chuck W5PR On Tue, Mar 19, 2019 at 2:02 PM Richard (Rick) Karlquist < rich...@karlquist.com> wrote: > > On 3/19/2019 8:47 AM, Herbert Schoenbohm wrote: > > I am working on an RX antenna that requires about balanced 800 match to > 75 > > ohm RG-6. I have some type 43 and 73 ferrite binocular cores but since > > this is just an experimental RX antenna I wanted to use an easier > approach. > > I have two commercial baluns that are unmarked but bridge out to a 75-ohm > > to 200- ohm match. What would be the problem if I connected them with > the > > first balun output feeding the 75-ohm input of the second one with the > > 200-ohm output of the first one? Anyone ever tried this. Would this also > > give me excellent ground loop decoupling between the RG-6 and the > antenna? > > What you have proposed (cascading transformers) would not work well. > What I have done that does work is to connect two MiniCircuits > ADT8-1+ transformers in series to form a 100 ohm to 800 ohm transformer. > "Connect in series" means to connect the two primaries in series, and > connect the two secondaries in series. This is different from cascading > transformers. > > This is an amazing transformer, much better specs than similar models > from MCL. I dissected one of these in an attempt to reverse engineer > it but was unsuccessful. So you can't make your own with binocular > cores. At least not with the same performance. > > 73 > Rick N6RK > _________________ > Searchable Archives: http://www.contesting.com/_topband - Topband > Reflector > _________________ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector