[TenTec] Re: Toasting those cores....

[Sinisa Hristov]

"Manuel R. Alonso" wrote:

> I ORDERED THEIR TYPE "K" MATERIAL BECAUSE
> SHE SAID THAT IS WHAT THEY USE ON THE W2FMI BALUNS THAT THEY SELL. IS TYPE
> "K" MATERIAL THE RIGHT ONE, OR SHOULD I USE TYPE 43 OR 77?

"K" is an excellent choice, stick to it.


> I AM GOING TO WIND TWO (BIFFILAR) #12 ENAMEL INSULATED WIRES ABOUT 12 TIMES AROUND THE
> CORE.

That makes a transmission line with a characteristic
impedance substantially higher than 50 Ohms. You may
wish to use a regular 50 Ohms coax, with Teflon
insulation for high power. Up to 1 kW RG58 will do,
or even Rg174 up to few hundred Watts.

Be sure to apply full power ONLY when the load is
known to be ~50 Ohms resistive, i.e SWR is below 3.


73,

Sinisa  YT1NT, VA3TTN