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From: topband-bounces@contesting.com
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topband-request@contesting.com
Sent: Thursday, August 12, 2010 10:00 PM
To: topband@contesting.com
Subject: Topband Digest, Vol 92, Issue 7
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Hi Frank
I have the ARRL's ANTENNA BOOK 20th Edition, and on Chapter 3 (The
Effects of the Earth), p.3-10 is Table 1 tht maybe contains all you want
about that.
If you haven't the book here is the table:
Number of radials 16 24 36 60 90 120
Length of each radial in 0.10 0.125 0.15 0.20 0.25 0.40
wavelengths
Spacing of radials in degrees 22.5 15 10 6 4 3
Total length of radial wire 1.6 3 5.4 12 22.5 48
installed in wavelengths
Power loss in dB at low angles 3 2 1.5 1 0.5 0*
with a L/4 radiating element
Feed-point impedance in ohms 52 46 43 40 37 35
with a L/4 radiating element
* compared to a perfectly conducting ground
73 Panos SV1GRD
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UR RST IS ... ... ..9 QSB QSB - hw? BK
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