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Re: COMPASS-1 needs your help



Hi Mike,

Unfortunately I was out for the second sunlit pass over ZL this morning so
was unable to send commands on that pass.
I have just had two Compass passes here in eclipse.  No response to the
commands so will try again in the morning when there are three sunlit passes
here although two are quite low (9 and 8 degrees) and one good one at 84
deg.

Alan
ZL2BX


-----Original Message-----
From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
Behalf Of Mike Rupprecht
Sent: Sunday, 17 August 2008 09:12
To: 'AMSAT-BB'
Subject: [amsat-bb] Re: COMPASS-1 needs your help

Hi all,

Now we received 2 successfully contacts with COMPASS from Alan (ZL2BX) and
Sion (9W2QC). 
On both passes was COMPASS in full sunlight. 

The most important commando is ****#14#200# to switch the heater off.

Thank you so much for your effort and time. And please, continue to trying
and help us to recover COMPASS.

Again, thank you very much for your help.

73, Mike
DK3WN




-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] Im
Auftrag von Alan Cresswell
Gesendet: Samstag, 16. August 2008 23:22
An: 'AMSAT-BB'
Betreff: [amsat-bb] Re: COMPASS-1 needs your help

Mike,

I have just sent the tone sequences to compass and received a very short
beep tone immediately after each command on the downlink.  The tone has a
slight change of pitch for its duration.  The equipment used was a TS-2000
with the tones in memory and the tone duration set to "SLOW"  (100ms tone,
100ms mute).
Compass pass at 2102 UT and max el 54 deg.

Alan
ZL2BX


-----Original Message-----
From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On
Behalf Of Mike Rupprecht
Sent: Saturday, 16 August 2008 13:55
To: 'AMSAT-BB'
Cc: Jakob.Schab@gmx.de; johannes.piepenbrock@gmx.de;
felix.koenig@alumni.fh-aachen.de; 'Artur Scholz'; kev@kunz.biz
Subject: [amsat-bb] COMPASS-1 needs your help

Hi all,

The recent events are dramatically. Our two ground stations are almost
inoperable.

A few days ago however, a hard-reset of the satellite had occurred, which
brought the satellite back into the following vicious circle: Once the
heater is being switched on, the battery power drops drastically, which
causes another hard-reset. This goes on and on. The only chance to recover
the satellite is to avoid the activation of the heater. This can be done by
adjusting threshold values. 

Since these values are reset after each hard-reset, we would need to send
them again and again, until the satellite is in a stable condition
(batteries charging), where no reset occurs.

Thus, if you would like to support this recovery phase and have the right
equipment to do so, please upload the following DTMF tones to COMPASS-1
(simply from loudspeaker via microphone)

THRESHOLD ADJUSTMENT (to do after every hard reset) 

****14#200#                  heater off to -55 degr                    THIS
IS THE VERY IMPORTANT COMMAND



****13#200#                  heater on to -55 degr
****16#170#                  critical batt threshold to 3.3V 
****15#255#                  low batt threshold to max -> charge batteries

The commands consist of 4 stars, two numbers, a hash, 3 numbers, and a hash.


If COMPASS receive this sequence successfully you can hear a short
confirmation beep.

 

There is an good and free DTMF dialer to download here:
<http://www.polar-electric.com/DTMF/Index.html#Encoder>
http://www.polar-electric.com/DTMF/Index.html#Encoder

 

Uplink:         145.980 MHz FM

Downlink:   437.275 MHz CW

 

If you have any questions, please ask me. Thank you very much in advance !!!


We appreciate your support!!  On behalf the COMPASS-team

73, Mike DK3WN

For more information see : http://www.raumfahrt.fh-aachen.de/news.htm

 

 

 

 

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