[Antennas] 1/4 wave sloper...whats really radiating?

Fri Feb 10 20:36:11 EST 2012

Jay:
I would suggest modeling the whole structure and wire antennas with 
EZNEC or your favorite version of NEC. Fluorescent and neon lamps will 
give you an idea of the voltage distribution along the antenna 
conductors but that gives little understanding of the far field strength.
 walt, W7PRB
On 02/09/2012 06:29 AM, jkolin at optonline.net wrote:
> I'm using two 1/4 wave slopers tied to one feed point at the top section of my 90' crankup twr. One is 75M and other is 40M. They are separated by 24" pvc pipe at the bottom end of the 40M wire. I run the twr up to abt 75' and both work very well at that height. 
>> Tower has 5 el 20M yagi on 42' boom at bottom of 12' Mast. A 3 el 10M yagi is at top of mast.
>> I think the yagis, their booms, possibly their individual elements and the 12' mast may be contributing to the actual total radiation.
>> I wonder how I can prove or disprove what components mounted above the slopers are actually radiating .
>> Neon bulbs or low wattage small flourescent 3/4" dia bulbs placed at possible high voltage points?
>> Any ideas ?
>> Thanks... Jay, NE2Q
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-- 
----- walt wcj9996 at frontier.com -----