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RE: [amsat-bb] HT uplink test via ISS?



On Tue, 15 May 2001, someone wrote...:

> I am ... thinking about leaving my car, with a D700... running on the
> ISS [test]. According to your chart below, I would reduce power and
> lengthen the time between beacons....

Actually, between the two (reducing power and lengthening the period),
lengthening the period is what helps overall throughput for everyone in
the test.  In other words, do not lower power just so you get a higher
rate according to the table, since that just adds to QRM...

Bob

> -----Original Message-----
> From: Bob Bruninga [mailto:bruninga@usna.edu]
> 
>   5W Omni every 1 minute  <== the objective
>  10W Omni every 2 minutes
>  25W Omni every 3 minutes
>  50W Omni every 4 minutes
> 100W Omni every 6 minutes
 
> In any case, we would ask that all packets include their station's test
> conditions such as "5w omni every 1 min", or "5W beam north evy 2 min"
> or "5W omni in trees" or "1W omni on hill"

> An ALOHA channel like the ISS with blind transmitters can probably support
> about 120 stations per pass.  The way to achieve this is for everyone to
> transmit LESS OFTEN so that there are fewer collisions.  Just set your rig
> to the recommended TRANSMIT RATE, go to bed, and lets see how we did in
> the morning.

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