Tnx, Jeffr, for your observations..Jim R. K9JWV
> From: jeff@ac0c.com
> To: rodenkirch_llc@msn.com; topband@contesting.com
> Date: Tue, 11 Feb 2014 20:02:48 -0600
> Subject: Re: Topband: Hi-Z Antennas Two Element Array Systems 2-LV2-5
>
> 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@ac0c.com
> > To: rodenkirch_llc@msn.com; topband@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
> > _________________
> > Topband Reflector Archives - http://www.contesting.com/_topband
> >
> > _________________
> > Topband Reflector Archives - http://www.contesting.com/_topband
> _________________
> Topband Reflector Archives - http://www.contesting.com/_topband
_________________
Topband Reflector Archives - http://www.contesting.com/_topband
|