From contact at hizantennas.com  Thu Apr  1 13:58:51 2021
From: contact at hizantennas.com (contact at hizantennas.com)
Date: Thu, 1 Apr 2021 10:58:51 -0700
Subject: [Hi-zreceivingarraydiscussions] Rx arrays for 10, 15, 20 ?
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	<97ac8321-fc4e-b967-8c67-ac23b01e4c24@pacbell.net>
Message-ID: <000001d72720$ad246800$076d3800$@hizantennas.com>

Hi Grant,
     You ask a very good question. Unfortunately its one question I have spent no time looking at. 
 The focus of all my work has been 40,80, and 160 meters with emphasis on 160. My latest offering has expanded the 3 element array to cover 160 to 30 meters. This wont work on 4 elements because of array size. 4 elements is pretty well limited to 40 meters maximum when looking for best 160 meter performance. As we speak some of my equipment is being used on 630 and 2200 meters in a couple different arrays. .
    Here is my take on it for what it's worth. The element placing becomes much more important for simple vertical arrays. 1 degree of phase change at 160 meters is approximately 18 inches. On 10 meters this would be less than 1.0 inches so the challenge becomes greater. The elements can't even bend in the wind if you expect modeled performance at 20 meters and above. This need for accuracy makes accurate cable cutting quite difficult if you are to believe what your doing without accepting anecdotal evidence. In addition the parts used to phase and combine complex multi element RX array at 20, 15, and 10 would preclude a wide operating range to include the lower frequencies. .
     Of course all of my comments are not to say it wont work as I have several customers who report that my arrays even though not intended to work above mostly 40 meters show remarkable receiving improvement on the higher bands. I spent 20 years doing high frequency pulse and other normal waveform handling research making the common function generator work up to 50 MHz with sine square and triangle waveforms. I grew very tired of massaging every 1/8 inch of interconnecting lines to get real performance at 50 MHz with phase coherent harmonics to preserve wave shape. I just don?t care to try that battle again going to anything above 30 meters. Its not a simple matter to get anything other than anecdotal evidence of performance above about 30 meters. One of the issues is the incoming wave angle can be truly above the wave angle peaks of vertical elements at the higher frequencies. Verticals do not do well above about 40 meters.  It may well be the case that a set of high impedance verticals 10 or so feet tall phased and combined properly on a 20 to 30 foot pattern would surprise me. I just simply have not made the effort as I have had lots of other fish to fry. Perhaps some day I might try it but likely not at 78 years young here.
 All that being the case it might be best served at higher frequencies with passive elements and single band arrays, I simply don?t know. I know good beam antennas really work.
  Sorry to be not much help Grant.
 Stay Safe.

Lee   K7TJR
Hi-Z Antennas

Hi Lee,

I was talking with Jeff W2FU and he was describing his Rx arrays for the upper bands.  With your advertised "better phase accuracy" I was wondering if that is possible in a 4 or 8 configuration.  If so, what are the important implementation issues?

Thanks,

Grant KZ1W