COMPASS-1 emergency mode
Thursday, August 14th, 2008 by DK3WN in COMPASS-1 still in emergency mode - battery voltage very low (3.2V) - only one beacon heard 0838 UTC 28 elev pass - no signal 1015 UTC 34 elev pass - compass ff073900070300210000a300ff 1133 UTC 05 elev pass - no signal 1805 UTC 06 elev pass - no signal 1938 UTC 39 elev pass - no signal 2114 UTC 25 elev pass - no signal Wednesday, August 13th, 2008 by DK3WN in COMPASS-1 0820 UTC 19 elev pass - no signal 0956 UTC 52 elev pass - no signal 1133 UTC 08 elev pass - no signal 1748 UTC 03 elev pass - no signal 1920 UTC 27 elev pass - no signal 2055 UTC 37 elev pass - no signal --------------------------------------------------------------------------- Subject: [amsat-bb] COMPASS-1 in emergency mode From: Mike Rupprecht Date: Thu, 14 Aug 2008 16:55:46 +0200 Hi all, we need your help ! COMPASS-1 is in emergency mode since Sunday night. The battery voltage is very low and the satellite is rebooting every pass. The CW beacon is on in sunlight - but only in 8 minutes interval. We need telemetry - so much as possible. Could you help us please and listen to COMPASS on 437.275 MHz? Any reports are very appreciated. You can find a simple CW telemetry decoder on my website http://www.dk3wn.info/software.shtm (also mp3 or wav files are welcome). Please send your reports to compass1cubesat [at] googlemail.com or post via this list. Thank you very much in advance - on behalf the COMPASS-team Mike, DK3WN --------------------------------------------------------------------------- Subject: COMPASS-1 From: Mike Rupprecht To: Mineo Wakita Date: Sat, 16 Aug 2008 15:27:46 +0200 Hi Mineo, We need your help !!! COMPASS-1 is in emergency mode and we cannot hear the beacon since 2 days. Could you help us please? Are you able to send DTMF tones (simply from loudspeaker via microphone) ? There is an good and free DTMF dialer to download here: http://www.polar-electric.com/DTMF/Index.html#Encoder Could you try this for us and send the following code please: ****14#164# Cf. ****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. This commando should switch the internal heater off. I think that's the only way to save power. If COMPASS receive this sequence successfully you can hear a short confirmation beep. Uplink: 145.*** MHz FM Downlink: 437.275 MHz CW If you have any questions, please ask me. Thank you very much in advance !!! 73, Mike DK3WN http://homepage2.nifty.com/plasma/program/dtmf_dec.html (Japanese)Subject: COMPASS-1 DTMF status From: Mike Rupprecht To: Mineo Wakita Date: Sun, 17 Aug 2008 20:09:45 +0200 Hi Mineo, thank you very much for your effort. We now have 3 successfullycontacts. Always during a long period in full sunlight. 73, Mike -----Ursprungliche Nachricht----- Von: Mineo Wakita Gesendet: Sonntag, 17. August 2008 15:40 An: mike rupprecht Betreff: COMPASS-1 DTMF status Hello Mike, I made DTMF wav file and DTMF uplink cable. I had tried to uplink many a time, but we could not hear any signal from COMPASS-1. We will try again it. JE9PEL, Mineo Wakita --------------------------------------------------------------------------- Compass-1 recovery efforts Seemingly, the command was successful on 18Aug2008. COMPASS is in emergency mode and the beacon is transmitting every 8..9 minutes if the voltage is higher than 2.8 volts. The RX/TX seems to work with voltages down to 2.4 volt. This explains why COMPASS responds to commands but no beacon sends. If the batteries are charged and the voltage is higher than 3.7 volts (!) COMPASS will switch autonomous into NORMAL mode. Only in this mode the FM transmitter (437.405MHz) is on and the satellite can send packets on request. --------------------------------------------------------------------------- Subject: [amsat-bb] Re: COMPASS-1 beacon heard From: Mike Rupprecht Date: Fri, 22 Aug 2008 12:00:19 +0200 Hi all, A replay of the previous pass! All commands sent and acknowledged at 0939 UTC. Beacon received at 0943 UTC: 00 compass ff0740150600002100009000ff Solar Cell Voltage 5.00 V Solar Panel 6 Cur 43.92 mA Solar Panel 2 Cur 0.00 mA Solar Panel 3 Cur 37.65 mA Solar Panel 4 Cur 131.76 mA Solar Panel 5 Cur 401.57 mA EPS Reset Counter 0 Power Level Critical Battery Capacity Heater Active Battery Heater ON Power Safe Counter 0 Emergency Mode Counter 0 Battery Voltage 2.82 V Battery Current 0.00 mA Battery Temperature -1 C Heater still on - I think there is no internal communication between the units (I2C bus down). Mhh, I haven't got a clue. 73, Mike DK3WN --------------------------------------------------------------------------- COMPASS-1 CW beacon
08.09.2008 12:53UTC 90002900065900202907c20004 --------------------------------------------------- Solar Cell Voltage 2.82 V Solar Panel 1 Cur 0.00 mA Solar Panel 2 Cur 257.25 mA Solar Panel 3 Cur 0.00 mA Solar Panel 4 Cur 37.65 mA Solar Panel 5 Cur 558.43 mA EPS Reset Counter 0 Power Level Critical Battery Capacity Heater Active Battery Heater OFF Power Safe Counter 41 Emergency Mode Counter 7 Battery Voltage 3.80 V Battery Current 0.00 mA Battery Temperature 4 C --------------------------------------------------- http://www.ne.jp/asahi/hamradio/je9pel/80908cmp.wav
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