[Lowfer] Re: Triflier Core Winding

[Stewart Nelson]

Hi all,

While it's not the only application, it's quite common for
multifilar windings to be connected in series and used as an
autotransformer.  In that case, if the entire resulting winding
is used as the primary, and a single section as the secondary,
then the impedance ratios are as John quoted.

--Stewart

----- Original Message -----
From: "Alberto di Bene" <dibene@usa.net>
To: <lowfer@mailman.qth.net>
Sent: Thursday, April 11, 2002 10:45 AM
Subject: [Lowfer] Re: Triflier Core Winding


> 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....
>
> 73  Alberto  I2PHD