Then again, you could use a co-linear antenna and get some real gain to the
horizon, like 7dbi.  Are you trying to talk omni-directional at ground
level?  It all depends on what you're using it for.  I used to see people
take 900mhz yagis, clip them to there windows and point them from an island
for a seriously long shot back to the coast.  If you are trying to get
distance, even a 5/8 wavelength whip is not the correct choice.  I must have
missed what the specific application of the antenna is.
Mike
----- Original Message -----
From: "David VanHorn" <dvanhorn@CEDAR.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, August 02, 2001 7:44 PM
Subject: Re: [EE]: VHF and UHF mini modules


> At 08:49 AM 8/2/01 -0500, Jim wrote:
> >Gotta reply to this ...
> >
> >A 1/4 wave radiator DOES NOT radiate straight
> >up. As a matter of fact, this is where *minimum*
> >radiation takes place. Any antenna handbook
> >will easily bear me out on this.
>
> You're right, I disremembered.
> However, the 5/8 is still better at concentrating power twoard the
horizon,
> than the 1/4 wave.
>
> The 1/4 wave works out well for working spacecraft, because it has
moderate
> gain above the horizon, and as the Sc passes overhead, the antenna null is
> roughly compensated for by the drop in range.
>
> Haven't tried ISS, but I worked MIR a few times, before it went into
> geosink orbit.
>
> --
> Dave's Engineering Page: http://www.dvanhorn.org
>
> I would have a link to http://www.findu.com/cgi-bin/find.cgi?KC6ETE-9 here
> in my signature line, but due to the inability of sysadmins at TELOCITY to
> differentiate a signature line from the text of an email, I am forbidden
to
> have it.
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>

--
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