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Re: OPAL Beacon



Hi Mineo,
Yes, the description of the 2 bits is right.

The time stamp changes only every pass:

05.09.2000 0535 UTC  OPAL 18:1445291277 <01>
05.09.2000 0715 UTC  OPAL 18:1668142770 <01>
05.09.2000 0854 UTC  OPAL 18:1991000565 <01>

To the time stamp I have the following acceptance, but I'm not sure:

   OPAL 18:1991000565 <01>
        XX:XXZZZZZZZZ   

Z : The difference is average 22855000 ticks. These are about 5580
seconds
(22855000 / 4096)  -> 93 minutes. Is this the period of opal?

73, Mike
------------------------------------------------
Name : Mike Rupprecht, DL1LSZ, AMSAT-DL #9502099 
Mail : mail@mike-rupprecht.de
URL  : http://www.qsl.net/dl1lsz
QTH  : Hoechst, GERMANY, Loc.: JN49LS
------------------------------------------------


Mineo Wakita schrieb:
> 
> I received again some digital beacons from OO-38(OPAL).
> She transmitted them every 10 seconds with 437.100MHz
> (+/- doppler), and 9600bps_FSK.  Time is UTC:
> 
> KF6RFX>CQ [11 Sep 2000  23:50:00] <UI R>:OPAL 19:2888678815 <01>
> KF6RFX>CQ [11 Sep 2000  23:50:10] <UI C>:OPAL 19:2888678815 <01>
> KF6RFX>CQ [11 Sep 2000  23:50:20] <UI R>:OPAL 19:2888678815 <01>
> KF6RFX>CQ [11 Sep 2000  23:50:30] <UI R>:OPAL 19:2888678815 <01>
> KF6RFX>CQ [11 Sep 2000  23:50:40] <UI R>:OPAL 19:2888678815 <01>
> 
> In the URL, http://ssdl.stanford.edu/opal/Operations/beacon.html
> 'Opal Beacon Summary' say :
> 
> > Beacon 1 - An AX.25 packet beacon containing Opal's current
> > time stamp and a 2 bit summary of Opal's health.
> > Example beacon:  OPAL 0:0009948696 <01>
> >
> > "0:0009948696" is the time stamp. It is the number of clock
> > ticks since last hard CPU reset onboard Opal. The number of
> > seconds can be calculated by:
> >
> >         seconds = (number of ticks> / ( 4096 )
> 
> Q1. I don't know why the above today's data doesn't change.
> Q2. Do the next two bit health states beacon are right ?
> 
> > 00 = all systems working nominal
> > 01 = voltage to high
> > 10 = temperature to high
> > 11 = voltage to low
> 
> ----------------------------------------------
> Name : JE9PEL/Mineo Wakita, Member of JAMSAT
> Mail : je9pel@jamsat.or.jp
> URL  : http://www.ne.jp/asahi/hamradio/je9pel/
> QTH  : Yokohama Japan, GL:PM95TJ
> Date : Sep 12, 2000
> ----------------------------------------------
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