[Towertalk] LPA designs

[Steve Katz]

Hi Josh,

I didn't know Tennadyne even made a 20m-only log yagi.  The only antennas on
their website are the T6 through T12 and one VHF-UHF model, nothing
monoband.

I don't think a 3/8-wavelength boom yagi can have 10.5dBd gain, either;
however, you might have to look at "how" they rated it.  I note a lot of
manufacturers, including Force-12 and Tennadyne, give references of gain
based on total gain (including ground gain) for an antenna mounted at a
certain height above earth, like 1 wavelength.  When you sum that, a small
beam can certainly have so much gain when installed at a favorable height.

WB2WIK/6

"If everything seems under control, you're just not going fast enough." -
Mario Andretti

> -----Original Message-----
> From:	xppq [SMTP:xppq@pyramid.net]
> Sent:	Friday, November 15, 2002 1:38 PM
> To:	Steve Katz
> Subject:	Re: [Towertalk] LPA  designs
> 
> I have TENNADYNE  6 el log yagi
> monobander for 20m on 27 foot boom.
> ON ground , hope to install up around
> 100feet once my new tower is installed
> 
> Tennadyne says 10.5 dbd GAIN !
> Very few hams will agree with that!
> Boom length being what it is.
> 
> I am told it is considerably better than
> the T 12
> 
> What ya think?
> 
> Josh N7XM   Nevada
> ----- Original Message -----
> From: "Steve Katz" <stevek@jmr.com>
> To: "'xppq'" <xppq@pyramid.net>; <towertalk@contesting.com>
> Sent: Friday, November 15, 2002 11:13 AM
> Subject: RE: [Towertalk] LPA designs
> 
> 
> > I think the responsible manufacturers don't make any ridiculous claims
> about
> > gain.  Tennadyne, for example, rates the T6 (12' boom, 6L 14-30 MHz) at
> > 5.1dBd and BW = 57 degrees, and it's very much bigger brother T12 (30'
> boom,
> > 12L 14-30 MHz) at 6.5 dBd and  on 20m.   Yet, the signals emanating from
> > these antennas are frequently stronger than signals from similarly
> located
> > stations using bigger stuff.  Why that is, is the question.
> >
> > I don't have the answer.
> >
> > -WB2WIK/6
> >
> >
> >
> >
> >
> > "If everything seems under control, you're just not going fast enough."
> -
> > Mario Andretti
> >
> > > -----Original Message-----
> > > From: xppq [SMTP:xppq@pyramid.net]
> > > Sent: Friday, November 15, 2002 10:28 AM
> > > To: towertalk@contesting.com
> > > Subject: [Towertalk] LPA  designs
> > >
> > > Peter  K4EWG  has a great LOG YAGI
> > > monoband design -  his GAIN estimates
> > > differ from many other "experts"  -
> > > but bottom line Pete knows his stuff
> > >
> > > josh n7xm
> > >
> > >
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