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Re: Satellite communications from hand helds



Michael ,

I have been using a Yaesu FT470 into a 1/4 wave to post my
APRS location with ISS. Along with an old MFJ TNC and
turning the system on and off at AOS and LOS with a very
old radio shack color computer.

John, W0JAB

----- Original Message -----
From: "Michael Hart" <mhart@terrigal.net.au>
To: <amsat-bb@AMSAT.Org>
Sent: Saturday, May 25, 2002 7:01 PM
Subject: [amsat-bb] Satellite communications from hand helds


> Last night I saw a show about the US ECHELON network.  They indicated that
> the satellites used could receive signals from mobile telephones.
>
> I realise that the NSA budget is probably a little bigger than AMSAT's but
> since amateur hand helds put out signifcantly higher power levels than
> mobile phones is should be easier to receive them.
>
> What are the main technical problems in designing a satellite to enable
hand
> held FM communications via satellite?
>
> [I don't mean path loss calculations as clearly the Americans have this
> under control with their Echelon system.  Would the high gain antennas
> required to receive such signals need to be steared, for example]
>
> Are these difficulties able to be overcome in the short term?
>
> Michael VK2JXI
>
>
>
>
> ----
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