Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5

[Jeff Blaine]

It takes some mental gymnastics to wrap your head around a hi-z feedpoint where the radial system is almost negligible vs. a low-z feedpoint (like a typical 30 ohm range transmit vertical) which is strongly dependent on the radial system.  I have the hi-z pro4-8 circle array and never thought at gut-level those short verticals and 4’ ground rods would work as advertised - but the performance is really fantastic.  I guess that’s the march of technology moving the art forward.

In addition to 80/160 (intended application) I have found the array very useful on 30 and 17m as well.  I have a vertical dipole on 30 for transmit so the residual directivity of the circle is a benefit there.  And on 17 it’s as good or better than my 3-element monobander.  I suspect the 17m improvement comes from the relatively closer location of that beam (near the house) compared to the circle (800’ away from anything).

73/jeff/ac0c
www.ac0c.com 
alpha-charlie-zero-charlie



From: James Rodenkirch 
Sent: Tuesday, February 11, 2014 7:55 PM
To: Jeff Blaine ; Top Band Contesting 
Subject: RE: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5


Tnx, Jeff


> From: jeff at ac0c.com
> To: rodenkirch_llc at msn.com; topband at contesting.com
> Date: Tue, 11 Feb 2014 18:35:00 -0600
> Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
> 
> The Hi-Z buffers have a feedpoint Z around 50K ohms. So a single 4' ground 
> rod provides an adequate round system. No radials needed.
> 
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
> 
> -----Original Message----- 
> From: James Rodenkirch
> Sent: Tuesday, February 11, 2014 3:20 PM
> To: Top Band Contesting
> Subject: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
> 
> Do the two verticals require any type of radial system or can a simple 
> "array" of 4 to 6 20' radials do the job??
> 72, Jim R. K9JWV
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