Topband: Termination Transformer

[Mike Waters]

Hello Mike,

On Fri, Jan 1, 2016 at 3:51 PM, Mike Greenway <K4PI at bellsouth.net> wrote:

> ... latest book Pg 7-88, “As we are dealing with nominal impedances that
> are higher ...  not sure why the doubling of the turns is needed.  The
> ratio stayed the same...
>

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).


... I guess the question is how bad does the resistance from different
> points on the winding to the core affect things
>

The short answer is that you should replace the windings that have the
coating scraped off.
Using a liner is best, but it's not absolutely necessary.

I'll bet you're using solderable wire, aren't you? If you have some magnet
wire with a tougher coating (such as Formvar or Belden® heavy-armored
Polythermaleze®) it's not so likely to be damaged. You'll have to remove
the coating at each end, because a soldering iron won't melt it.

73, Mike
www.w0btu.com