[SCCC] The Moxon Claw antenna

[Paul Kube]

I haven’t built it but I agree it looks interesting. Reminds me a bit of the TEDERTPEA (acronym affectionately constructed  by K1MK from Two Element Double Extended Remotely Tuned Parasitic Endfire Array) I built at W1MX in the late 70’s. That antenna covered 3.5 to 7.3 MHz with unity SWR, instantly switchable 45°/135°, good F/B, and worked well.  I was going to write it up for QST but graduation got in the way and I went on to other things.

73, Paul K6PO

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From: Clayton Nall<mailto:clayton.nall at gmail.com>
Sent: Thursday, July 9, 2020 11:03
To: sccc at contesting.com<mailto:sccc at contesting.com>
Subject: [SCCC] The Moxon Claw antenna

Hi Folks,

With all the years of experience here in the contest club, I'm wondering if
anyone's had experience building or attempting to build one of these
antennas, which may be Moxon's most interesting antenna design.  As far as
I know, the only person who is using and evangelizing the antenna is VK6PH.

It's a fascinating design that allows instant beam heading reversal and one
of the interesting features is that you can, in theory, adjust the antenna
to give maximum gain on transmit then maximum F/B on receive.  It also
offers continuous frequency coverage and gain from 20-10M.
http://www.vortexantennas.co.uk/claw_pt1_final.pdf
http://www.vortexantennas.co.uk/claw_pt2_final.pdf

On 20M, the current is at the top of the antenna, so the effective height
is well above mast level.  Good for people with less ability to put
antennas on high towers.

I can see how lots of folks would just settle on an easily built Hexbeam
instead of trying to homebrew this.  And, obviously for contesters, a major
limitation is that it's not a duplex-able tribander for SO2R.

73
NF1R

--
Clayton Nall
http://www.nallresearch.com
Work: (650) 725-4076
Cell: (617) 850-2062
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