[Antennaware] YO7 for Design of OWA Antennas?

[Charlie]

 I've driven YO 7.65 on four different yagi's, all of them successful designs.  4el 20m, 5el 15m, and two 5 el 6m (different boom lengths).

All were designed for a wide vswr passband.  For example, my 4el 20m covers the whole band with <1.5:1 vswr and >20 dB f/r. It is on a 26' boom.  Gain was >6 dBi, if I remember correctly.  It's been 7 or 8 years since I designed this one.

None of the designs are the classical "OWA" with direct 50 ohm feed.  I've never been able to drive the software to that solution.

All of the designs, instead, let YO settle on it's "natural" 20 to 25 ohm feedpoint Z.  All designs were matched with a hairpin (beta) match.  In fact, all of the designs were run through a final optimization tweak with the hairpin match modeled.  All of the designs came up dead-nuts on without any final tweaking when put in the air.

I'm no expert... I'm sure that there are others who have way more experience than I do, but I'd be happy to answer any questions that I can.

Vy 73,
Charlie  N9CO

 

 

-----Original Message-----
From: (K7ZO) Scott Tuthill <k7zo at cableone.net>
To: antennaware <antennaware at contesting.com>
Sent: Thu, Jun 28, 2012 10:52 am
Subject: [Antennaware] YO7 for Design of OWA Antennas?


Anyone out there have any experience using YO7 to design OWA antennas? I 

have some questions I would like to ask you.



Scott/K7ZO  k7zo at cableone.net 



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