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Old October 28th 06, 02:54 PM posted to rec.radio.amateur.antenna
Cecil Moore Cecil Moore is offline
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First recorded activity by RadioBanter: Jul 2006
Posts: 1,614
Default Hf Antenna Question - so what's the conclusion?

Ian White GM3SEK wrote:
What kind of wire, what kind of insulation, and how much gap between
turns? It affects the self-capacitance.


Unfortunately, the spare (75 ohm) coax that I
have to experiment with came free from the local
TV cable company and is unmarked. It is ~0.26"
in diameter with a ~0.04" outer insulation. All
conductors are aluminum. There is an aluminum foil
wrapped around the foam insulation under the aluminum
braid. The choke is fairly close wound with approximately
3.5 turns per inch.

I'd like to try that on the VNA, but here in the homeland of porridge,
oatmeal boxes are rectangular!


Do you have 2 liter plastic pop bottles available
there? I'm going to re-do the experiment with one
of those as a coil form. There's an endless supply
of those coil forms from the day care center next
door.
--
73, Cecil http://www.w5dxp.com