I need about 50mm of coax hardline. I don't have any at home, but I do have a lathe, some copper, and some teflon stock.
Can I make my own coax hardline on the lathe? According to my calculations, for a 1mm center conductor, and a dielectric constant of 2.02 (PTFE), the outer conductor should be about 3.27mm for 50 ohms impedance.
I have a 3.25mm drill which should be close enough.
Would this work?
It's for building this antenna:
The antenna is simply a turnstile antenna, for 1.7ghz. hardline is used for support.