[amsat-bb] Re: AMSAT Symposium News Posted to the Web

Tony Langdon vk3jed at gmail.com
Wed Oct 14 14:02:29 PDT 2009

At 03:53 AM 10/15/2009, Andrew Glasbrenner wrote:
>Sanford, Fred wrote:
> > I hope that AMSAT NA does not use an 70cm uplink, because that 
> band is not available for transmitting in all areas of the US.  I 
> live near Cape Cod, MA and 70cm is not available for transmitting 
> because of PAVE PAWS.
> >
> > Fred - KA1CQD
> >
> >
>70 cms is actually the preferred uplink for a number of reasons,
>including less path loss on the downlink, less ground based QRM, and
>easier Doppler management. This was part of my lessons learned at LEO
>paper from the Symposium.

70cm uplinks work better here.  We have had issues with newcomers not 
hearing the downlinks on 70 and then causing QRM, because they're not 
aware there's anyone there.  2m uplinks in this part of the world 
suffer from QRM when the birds are over Asia.  This affects FM LEOs 
worst, the linear transponders aren't as badly affected.

I've long preferred 70cm uplinks (the big reason SO-35 was such a hit 
down here).

73 de VK3JED / VK3IRL

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