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

[Van Kuykendall]

Where can a person buy something like a Teflon insulated  RG-8X for high
power hf?
Tnx,
Van N5HTY
 
-------Original Message-------
 
From: tentec at contesting.com
Date: 03/31/04 08:33:42
To: tentec at contesting.com
Subject: Re: [TenTec] Re: Toasting those cores....
 
"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
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