| To: | <tentec@contesting.com> |
|---|---|
| Subject: | Re: [TenTec] balanced feedline light bulb test |
| From: | "Stuart Rohre" <rohre@arlut.utexas.edu> |
| Reply-to: | tentec@contesting.com |
| Date: | Wed, 16 Jul 2003 15:30:14 -0500 |
| List-post: | <mailto:tentec@contesting.com> |
Noted Antenna authority and modeler, L. B. Cebik notes that the end fed Zepp, with ladder line feeder, (balanced line), shows only 10 per cent imbalance for this extreme end fed case where one side of the line is open circuit. Of course, the usual practical length of line must cause some of this; but the 15 per cent as the point where you first might see imbalance might not be far off the mark. Lamp intensity is a very good indicator, if you have good eyes and back up the lamp on each side with a flat black card. Particularly if you can do the comparison in low ambient light, such as after dusk. 73, Stuart K5KVH |
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