Re: NEC-LIST: Coil-loading and ground resistance.

Miron,

I wonder if a short whip on the roof is equal to or better than a long
whip on the bumper. If the car and whip are functioning as a vertical
dipole then the distance from the bottom of the auto to the top of the
whip might be all that matters. I will run a simulation.

  Dave

-----Original Message-----
From: nec-list-bounces+drcuthbert=micron.com_at_robomod.net
[mailto:nec-list-bounces+drcuthbert=micron.com_at_robomod.net] On Behalf Of
D. B. Miron
Sent: Thursday, February 17, 2005 1:21 PM
To: nec-list_at_robomod.net
Subject: NEC-LIST: Coil-loading and ground resistance.

Good day,

I just translated the Harrison monopole to 3 MHz (3.183 m
tall), put 8 5-m radials around it, and put the system 0.1 m
above average ground (sigma=5 mS/m, epser=13). The ground
resistance was only 1.6 ohms, not enough to give
center-loading a big advantage over base-tuning. I guess
I'm just going to have to put an HF whip on the back of my
hatchback and see what happens.

Doug Miron

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