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Re: P3D information



Hi Bob

Yip, you're absolutely right, certainly at apogee! No way you're going to
hear the sat without a nice big yagi!

My understanding is that when it's _eventually_ in the Molniya type orbit,
the sat should have a perigee of a 4000km, when it's quite easy to hear with
a vertical: something I've been able to do on many occasions on AO-10.

I guess it all depends on where this bird ends up. If the projected orbit
happens, it should be really easy to hear close to perigee, for us sitting a
way from the equator. It's designed to  traverse much further north and
south than AO-10.

OK, so it only spends a relatively small amount of time close to perigee.
However, that should be enough to get some kind of idea what kind of radio
horizon you have over a month or two.

Of course any buildings will chew even further into those 33dB losses.

73 Howard G6LVB

----- Original Message -----
From: "Bob Bruninga" <bruninga@nadn.navy.mil>
To: "Jon Ogden" <na9d@mindspring.com>
Cc: "Tony Langdon" <tlangdon@atctraining.com.au>; "'Howard Long'"
<howard@hanlincrest.co.uk>; <amsat-bb@AMSAT.Org>; "jeff w griffin"
<kb2wqm@juno.com>
Sent: Friday, October 06, 2000 2:39 PM
Subject: Re: [amsat-bb] P3D information


> On Thu, 5 Oct 2000, Jon Ogden wrote:
>
> > Let's be realistic about this folks.  Working P3D at 43,000 KM is far
> > different than working UO-14 at 900 KM.  BIG DIFFERENCE.
>
> Like 33 dB!  So if you do it with 5W into UO-14 you need 10,000 W to do
> it with P3D!  But P3D does have GAIN antennas where as UO-14 does not.
> But this still only makes up a fraction of the difference...
>
> Bob
>
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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>

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