>Pretty much the same here. 600 ohm balanced pair to the house.
What is coming into the house on a 600 ohm balanced pair? An RF transmission
line I would believe. A telco line or audio line I would not. The military
surplus field
telephone transmission line being discussed in conjunction with the Beverage
thread
on the Top Band reflector was cited as being 150 ohms, and someone confirmed
that with measurements.
I'm a fairly old guy, and I have never seen a transmission line having a Zo
much
greater than about 150 ohms that wasn't some form of either ladder line or open
wire
line. Virtually all cable used for telco and audio has a Zo on the order of
50-100
ohms. Doing the arithmetic for Zo and cable construction shows that it's
pretty
difficult to get a Zo greater than about 200 ohms using anything but open wire
line. A
careful study of a cable catalog (Belden, for example) will confirm this.
73,
Jim Brown K9YC
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