dansawyeror wrote:
Good morning. I would like to experiment with making a high Q coil for
creating a tuned radial counterpoise. Reg's program predicts a coil of
about 70 uH will create a match. One way to create such a coil would be
to wind coax and use the shield as the conductor. Besides the obvious
loss of physical stability due to lack of a form what are the
limitations or drawbacks from using the shield?

The braided shield will be substantially lossier than a solid wire or
tube of the same diameter. And the relatively poor quality dielectric
used for the outside of the cable will also reduce the Q somewhat. So
coax isn't a good choice for your stated objective of making a high Q coil.

Roy Lewallen, W7EL