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In message , RST Engineering
writes I tried simulating a Slim Jim in EZNEC and did NOT get the expected "aim at the horizon" low-angle radiation simulated pattern. I got instead the standard "hole in the donut" that you would expect from a vertical dipole and a rather fat true donut shape rather than the expected pancake pattern. I'm not at all sure how to connect a "voltage source" driver at the tap point without being able to simulate the ground of that voltage source tapped up from the bottom end as well. You should have a wire across the bottom of the antenna at the tap point. The voltage source is in the centre of this wire. A real Slim Jim would be fed with a balun so both halves of the matching section are fed symmetrically. This however won't change the radiation pattern. There's nothing magic about a slim jim, it's just a voltage fed folded dipole so the radiation pattern will look like a dipole. 73 Brian GM4DIJ -- Brian Howie |
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