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From: tmsmp%Ucb-Vax@homxb.UUCP
Newsgroups: net.ham-radio
Subject: Log-Periodic Dipole Array Antenna
Message-ID: <10606@brl-tgr.ARPA>
Date: Sun, 12-May-85 09:30:26 EDT
Article-I.D.: brl-tgr.10606
Posted: Sun May 12 09:30:26 1985
Date-Received: Tue, 14-May-85 08:19:25 EDT
Sender: news@brl-tgr.ARPA
Lines: 23

I am interested in building a directional antenna to replace my trap
vertical.  The ARRL Antenna book contains plans for a log-periodic
dipole array.  This caught my attention as an alternative to stacked
monoband beams.  I have obtained the original QST article (Nov. 1973)
and will try to contact the author.

Does anyone have any experience with or knowledge of this type of
antenna?  Does any commercial manufacturer offer one?  If not, why is
there no commercial interest?  Is there a fatal flaw in the design?
The QST article states that the author uses a transmatch to "eliminate
possible harmonic radiation caused by the frequency-independent nature
of the array."  Is interference a major consideration?

Any help is greatly appreciated.

Thanks

Tom Swift
KD2MF (formerly WA2JEH)
AT&T Information Systems
Holmdel
homxb!tmsmp
201-949-3374 (W) or 201-577-6945 (H)