Let's say I have a free-standing vertical HF antenna transmitting about
10wa, and I'd like to run wires to something at the tip. Say an
anemometer, or a temperature sensor. What would be the best way to run
the wire up the antenna? If the HF vertical is a pipe, is inside the
best bet? If it's shielded wire next to a solid antenna, will that
affect the radiation pattern of the antenna as a parasitic element? How
much energy at the tip of the antenna will couple into the wire? If the
wire is carrying low-speed digital data (eg for a 1-wire temperature
sensor), how much isolation would it need (choke, AC couple, opto-isolate,
etc) to avoid getting the HF into the digital signal?

Thanks for any insight!

--
Ben Jackson

http://www.ben.com/