RE: [amsat-bb] PACTOR on the birds

["Christensen, Eric" <CHRISTENSENE@xxxxxxx>]

So how would one do a connected packet via an amateur satellite?

I don't think that PACTOR is 100% duty cycle.  Compared to the bandwidth
that is available on some sats it would take up a very small sliver of the
bandwidth.  Or are you looking at duty cycle in a different way?

I could see the Doppler correction being a problem but if it were computer
controlled couldn't you correct that fast?  And if the connection wasn't
being used on a LEO the Doppler wouldn't be that fast, right?

Eric KF4OTN


-----Original Message-----
From: owner-AMSAT-BB@amsat.org [mailto:owner-AMSAT-BB@amsat.org] On Behalf
Of Andre v Schayk
Sent: Tuesday, 11 April, 2006 13:32
To: amsat-bb@amsat.org
Cc: fieldops@amsat.org
Subject: Re: [amsat-bb] PACTOR on the birds

Christensen, Eric schreef:

>Can anyone tell me why I couldn't use PACTOR a satellite, given I had
enough
>room, etc...  Trying to think out loud.
>
>73s,
>Eric KF4OTN
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>
The reason is twofold, a technical one and an operational one.
The technical one is that pactor is not dopler tolerant, the tolerace
for pactor 1 is less then 80 hz, I think pactor 2 and 3 are even more
critical.
The operational problem is that it is very bad practice to use a 100%
dutycycle mode on most linear sats, some will alow psk31 sstv and other
modes but most donīt.

73 de Andre PE1RDW
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