[amsat-bb] AO-40 on Field Day

["Stacey E. Mills" <w4sm@xxxxxxxxxx>]

Scott Townley wrote:

>Set your TX freq well away
>from the MB, vary RX to find your own D/L, and based on that pair you
>should be able to do the final Doppler correction to get where you wanna
>go.
>Bring a calculator (I can't do that kind of math in my head well, at

Although I realize that those who read this bulletin board are unlikely to 
be the source of problems, I'd like to echo Scott's comments.  The passband 
is 250 KHz wide.  That's a lot of room!  Please use it all except for ~5 
KHz either side of the middle beacon.  Be careful of drifting into the 
beacon as the doppler changes.  Use the extreme upper or lower several KHz 
of the passband for "finding yourself" by fixing your Tx freq. and varying 
your Rx. freq.  Once found, calculate your translation equation and you 
should be off and running.  The command team needs to monitor the health of 
the spacecraft during this time.  Although we expect the heavy use to 
primarily manifest as increases in receiver AGC's, we do need to monitor 
battery voltage, S2 temperature, etc.  If the beacon frequency is stepped 
on to the point that we cannot ascertain the health of the spacecraft, then 
the passbands will have to be turned off, at least temporarily.

To those who are newbies to AO-40, this will be real trial by fire for 
you.  The passband will resemble "normal" about as much as Times Square in 
New York is normal at 11:59 PM on December 31st.

Thanks and good luck!




-- 
  ________________________________________________________________________
  Stacey E. Mills, W4SM    WWW:    http://www.cstone.net/~w4sm/ham1.html
    Charlottesville, VA     PGP key: http://www.cstone.net/~w4sm/key
  ________________________________________________________________________

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