Topband: Termination Transformer

[Mike Waters]

Hi Jim,

Thanks for the correction! As soon as I hit "SEND", I realized that I
should have said "inductance" rather than "impedance".

The inductance of the winding should at least four times the impedance of
the load at the lowest operating frequency.

73, Mike
www.w0btu,com

On Fri, Jan 1, 2016 at 6:39 PM, Jim Brown <jim at audiosystemsgroup.com> wrote:

> On Fri,1/1/2016 3:09 PM, Mike Waters wrote:
>
>> John appears to be taking into account the impedance of the winding vs.
>> the impedance that the winding is connected to (the 710 ohm line).
>>
>
> A review of how transformers work is in order. Except for stray effects
> (capacitance between windings, resistance in a core), transformers have no
> impedance of their own. Rather, they multiply the impedance connected to
> the other winding by the square of the turns ratio. If you measure Z of an
> ideal transformer with the other winding open circuit, you should see an
> open circuit (infinite Z). Real transformers have strays, so you'll see
> some high Z.
>