[Lowfer] Re: Triflier Core Winding

[Ed Phillips]

Alberto di Bene wrote:
> 
> John Andrews wrote:
> 
> > Bifilar (2 twisted wires), trifilar (3) and quadrifilar (4) transformers
> > provide low-loss broadband impedance transformation. The impedance ratio is
> > the square of the number of turns in the winding. So you get 4:1 for
> > bifilar, 9:1 for trifilar, etc.
> 
> Uhhhh ? If I wind a bifilar transformer, using one of the two wires as primary,
> and the other as secondary, what I get is 1:1 impedance ratio.... not 4:1....

	Yep.  Of course, if you make an autotransformer with turns connected so
that voltages add, you'd get those impedance ratios.  I have a neat ARRL
book on "TRANSMISSION LINE TRANSFORMERS" (unfortunately it's at work, so
I can't get the author's correct name) which covers all sorts of useful
things.  All I can remember is that the author's name starts with Jerry,
and he has a W2 call.  Well known guy, but apparently not to me right
now!

Ed