On 8/30/2012 4:15 PM, Wayne wrote:


"KBa" wrote in message ...

# Hi all

# Problem exists how to get reliable insulation to split driven element
# and support rod which is exposed to RF voltage ?
# Fiberglass is told to be sensitive creating conductive coal brigdes
# which creates true resistive short at driving point ? (at least one
# fiberglass tubing is done so... gap was 2 inches )

# How to improve insulation ? Ptfe-shield over fiberglass rod, heat shrink
# tubing, varnish layer ?

# tnx oh6io

I'll leave the specifics of your question to the experts.

But, worth mentioning is that once you have selected a material, plop
some in a microwave along with something like a a container of water.
Then see if your insulating material stays cool.

Wayne
W5GIE

Which is valid at the microwave oven frequency. Might be relevant at
HF, or more likely, not.

tom
K0TAR