[ARC5] Toroid for 9:1 Balun

[Mark K3MSB]

Gents --

Thanks for the replies.  I found some Amidon T200-2 cores in my stash.
Way overkill for what I need them for, but they're here.....

So, another question or two....

If I want a 9:1 impedance ratio, then my turns ratio needs to be 3:1.    I
can do 3:1,   9:3,   30:10, etc.   I guess what ever values I pick should
be spaced equally around the toroid?

Some photos show the smaller number of turns only over a portion of the
other winding,  others show it equally spaced.

73 Mark K3MSB

On Tue, Sep 1, 2015 at 12:52 PM, gordon white <gewhite at crosslink.net> wrote:

> I have a couple of toroid coils from old telephone co loading coils.
>
> Were once used by RTTYers.
>
> Do not know the value.
>
> Once upon the time I would buy steel "pots" from a WECO scrap dealer and
> laboriously cut them open to get these coils out.  My kids (this was back
> in the 1980s) would cut them apart after I cut open the pots.
>
> Of course the kids are now in their 40s and 50s and would not do such a
> thing. I do not know if the phone companies use these any more
>
> Gordon Eliot White
>