archive: Re: SETI: Polarization Modulation

Re: SETI: Polarization Modulation

rtyndall@juno.com
Fri, 4 Sep 1998 09:38:27 EDT


On Thu, 03 Sep 1998 21:02:46 -0500 Lloyd Doering <dewitt@bellsouth.net>
writes:
>Has any radio/communications work ever been done using polarization
>modulation/demodulaton?
>We now use polarization to isolate stations in satelite microwave
>broadcasts. I'm specifically wondering whether CW controlled circular
>polarization, the direction and rate of change of polarization, could
>be used to carry a complex signal.

Rich Replies:
It would be possible, If the transmitting station was spinning his
antenna.
The receiving station (w/ linear polarization) would see peaks and
valleys (a sine wave) of signal strength reproducing the RPMs of the
spinning ant.

I think it would be feasible to transmit two different channels on the
same freq,
if they were on opposite polarities. On the receive end, there would be
some
cross-talk, but the levels would be low.. It might even be practical on
FM voice.
Later, RIch <>

Richard Tyndall NJ1A Woburn, MA. USA
RTyndall@juno.com or nj1a@erols.com
ARGUS Observatory FN42jl
Currently scanning LHCP on 1420.3+ @ Dec 0d 32m 15s
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