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Re: circular polarized Arrow antenna



Better check your math, Glenn.  50 watts into 10dB gain =
500 watts.   50 watts into 3dB gain = 100 watts.

73,

Woody
KJ4SO

----- Original Message -----
From: "Glenn Little" <glittle@awod.com>
To: "'Gary "Joe" Mayfield'" <gary_mayfield@hotmail.com>; "'Greg D.'"
<ko6th_greg@hotmail.com>; <amsat-bb@AMSAT.Org>
Sent: Wednesday, January 30, 2002 10:02 AM
Subject: RE: [amsat-bb] circular polarized Arrow antenna


> I want one of those quarter wave antennas!  50 watts into 10dB gain =
> 100 watts.  I would love to get a quarter wave antenna with a 100dB
> gain!
>
>
> 73
> Glenn
> WB4UIV
>
>
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On
> Behalf Of Gary "Joe" Mayfield
> Sent: Wednesday, January 30, 2002 8:13 AM
> To: Greg D.; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] circular polarized Arrow antenna
>
> What is the claimed front to back ratio?  50 Watts into an antenna with
> a 10
> dB front to back ratio is the same as 5 Watts into a quarter wave.  Just
> be
> clever enough to stay behind the antenna, and holding it away from your
> body
> might be a good idea as well.  If you have a hand held it is probably
> much
> worse at full power.
>
> 73,
> Joe
> ka0yos@amsat.org
>
> ----- Original Message -----
> From: "Greg D." <ko6th_greg@hotmail.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Wednesday, January 30, 2002 12:33 AM
> Subject: Re: [amsat-bb] circular polarized Arrow antenna
>
>
> > >
> > >The greatest thing about the handheld Arrow is the ability to rotate
> the
> > >boom to change the polarization at any instant. This is also a great
> > >learning exercise about the changing polarity of the signal from a
> > >moving satellite. As it moves through space, you can rotate the axis
> > >of the boom to change polarity to peak it for the strongest signal
> > >level.
> > >
> >
> > Is anyone besides me worried about pumping 50W into a hand-held gain
> > antenna?
> >
> > Greg  KO6TH
> >
> >
> > _________________________________________________________________
> > Send and receive Hotmail on your mobile device: http://mobile.msn.com
> >
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> >
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