Re: Anyone used a spiral wound coil as an antenna?


Russ Edmunds <wb2bjh@...>
 

These were directional with the peak/null being the opposite of a multi-turn air-core loop. My 2', 18-turn air core loop peaks off the 'ends' or the coil, nulls at the broad side. The spiral loop peaks on the flat side, nulls on the narrow edge. The spiral loop has both less gain and less directionality ( which also means less sharp peaks and nulls ) than the larger loop. I no longer have a spiral because it didn't do the job for me.

Russ Edmunds
Blue Bell, PA ( 360' ASL )
[15 mi NNW of Philadelphia]
40:08:45N; 75:16:04W, Grid FN20id

FM: Yamaha T-80 & Onkyo T-450RDS w/ APS9B @15'
AM: Modified Sony ICF 2010 barefoot


--- On Sun, 8/8/10, farmerik <farmerik@...> wrote:

From: farmerik
Subject: [ultralightdx] Anyone used a spiral wound coil as an antenna?
To: ultralightdx@...
Date: Sunday, August 8, 2010, 12:54 PM

 

I am curious what pick up pattern the old fashion spiral wound antennas had, you know, the ones with effectively only the depth of a single turn. [Not box or solenoid wound] -FARMERIK


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