[amsat-bb] Re: COMPASS-1 needs your help

[Mike Rupprecht]

Hi Alan,

great - that sounds very good :-)

This is a good sign, that the batteries are not dead and the voltage is
around 3.2 volt.
So we can only wait to the next passes. Maybe the battery voltage is
increased and the beacon on. Could you please continue trying to send the
codes? 

I think we have only a good chance if COMPASS is in full sunlight.

Thanks again and best 73, 
Mike
DK3WN


-----Ursprüngliche Nachricht-----
Von: amsat-bb-bounces at amsat.org [mailto:amsat-bb-bounces at 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 at amsat.org [mailto:amsat-bb-bounces at amsat.org] On
Behalf Of Mike Rupprecht
Sent: Saturday, 16 August 2008 13:55
To: 'AMSAT-BB'
Cc: Jakob.Schab at gmx.de; johannes.piepenbrock at gmx.de;
felix.koenig at alumni.fh-aachen.de; 'Artur Scholz'; kev at 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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