[amsat-bb] Re: AO-51 update 22 August 2010

Rick - WA4NVM wa4nvm at comcast.net
Sun Aug 22 16:10:51 PDT 2010

Hi Mark,

So far into the 2310z pass.......... nothing.  ??


> Hello All,
> According to projections, the next 100% illumination period for AO-51 has 
> begun.  Hopefully for the next week or two we can run both transmitters ON 
> at reasonable power.  The PL tone isn't needed (and hasn't been for the 
> last few weeks).
> FM Digital PBBS, U
> Uplink:  N/A
> Downlink: 435.150 Mhz FM
> FM Repeater, V/U
> Uplink: 145.920 Mhz FM
> Downlink: 435.300 Mhz FM
> Even though AO-51 "sees sunlight" all the time, it doesn't "see" the sun 
> equally throughout an orbit.  So, we are going to keep the power 
> management software running in hopes that we can optimize the transmitter 
> power output and keep the battery temperatures down.
> The way it is currently configured, AO-51 can run in one of three states, 
> depending on available battery power:
> 1) HIGH 435.300 at 550 mW and 435.150 at 420 mW
> 2) MEDIUM       435.300 at 420 mW and 435.150 at 300 mW
> 3) LOW  which currently sets both transmitters effectively to OFF
> It is very likely that users will see the transmitter power going up and 
> down some as the battery voltage goes up and down.  We hope it's not too 
> often, and adjustments will be made after collecting some telemetry over 
> the next few days.  Our goal has always been to keep it ON and useable as 
> much as possible, and we'll do our best to continue that tradition.
> Activity reports over the next few weeks to http://oscar.dcarr.org/  (or 
> to me at   n8mh AT amsat.org if Ao-51 appears to be OFF)  will be very 
> much appreciated.
> And finally--telemetry files (KISS format preferred) from around the world 
> will be greatly appreciated for the next few weeks!
> On behalf of the AO-51 Command Team,
> Mark L. Hammond  [N8MH]
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