[amsat-bb] Re: RH and LH CP simutaniously

Edward Cole kl7uw at acsalaska.net
Sun Jan 4 14:46:08 PST 2009


Sort of like voting.  Actually both receivers are receiving full 
time.  The computer combines this information and the signals 
received to both display the effective polarization angle and produce 
a maximized signal output.  An alternative that is available with 
Winrad and Linrad is to output each audio stream to the right and 
left ear of a stereo headset with the result your ears and brain 
process the effect.  Polarization changes produce a stereo effect, as 
it were.  This is currnently being done be eme stations!

HF stations have long done diversity reception by use of two recevers 
and antennas separated by some arbitrary amount.  When done with FM 
repeaters the repeater compares all received signals and choses 
(votes) for the best signal to repeat.  This is largely an analog system.

For eme and possibly satellite application audio is digitized and 
processing is done in the computer with audio reconverted from the system.

73 Ed - KL7UW

At 04:40 AM 1/4/2009, Tim Tapio wrote:
>Then as suggested, you have a receiver set for each case and let them vote
>as to has the best signal...that's letting the computer do the work....
>Tim T.  K4SHF
>-----Original Message-----
>From: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
>Behalf Of Nigel Gunn G8IFF/W8IFF
>Sent: Sunday, January 04, 2009 8:19 AM
>To: Edward Cole
>Cc: amsat-bb at amsat.org
>Subject: [amsat-bb] Re: RH and LH CP simutaniously
>But why should I have to check? That's one of the computers jobs.
>Edward Cole wrote:
> >
> > A better approach for satellite is just having the capability to
> > switch pol when it is needed.  if signals begin to fade, you switch
> > pol to check if that is better.
> >
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