Are you correcting for tapered elements?
73,
geo - n4ua
On Mon, Sep 19, 2011 at 4:00 PM, Doug Snowden <dougn4ij@gmail.com> wrote:
> A recent post made me think of this question. I have been playing with
> the free MMANA modeling software, as well as the older Yagimax. My
> first models were the usual dipole etc. I started playing with yagis,
> and one thing I tried to do was to model a
> Hygain 204ba. I can arrive at decent pattern, f/b, gain etc. All of
> the models I have seen seem to model the HyGain antennas with shorter
> elements than the actual measurements from a Hygain assembly manual.
> The actual measurements are a foot or more longer for, say the
> reflector than the modeled antenna. Other elements are similar in
> difference. The K4VX Yagimax seems to agree with the modeling files I
> see. The ARRL has a ZIP file with all of the HyGain designs. The
> models include the 3 inch boom mounting dimensions too. I have
> changed element tapers. and this does not have anywhere near the
> influence to change the results that I see. I am confused, but, as
> usual, it will be something I have overlooked. Would this have
> something to do with the Beta (hairpin) match that HyGain uses?
>
> Doug, N4IJ
> _______________________________________________
>
>
>
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|