August 2011 - AMSAT-BB - mailman.amsat.org

ARISSat-1 battery eclipse voltage decreasing
by Gould Smith 14 Aug '11

14 Aug '11

The ARISSat-1 Battery voltage is decreasing each eclipse period. It therefore is taking longer for the Battery to charge up to 32.5V to allow the switch from Low Power to High Power when the satellite enters an illumination period. Kenneth Ransom, N5VHO has plotted the battery min/max for the last 8 days. We see that the battery voltage is decreasing at a faster rate than expected. Kenneth's graph can be found on the arissat1.org site under FAQ http://www.arissat1.org/v3/index.php?option=com_content&view=section&layout… Take advantage of the High Power mode as much as possible over the next few days. 73, Gould, WA4SXM for the ARISSat-1/RadioSkaf-b team

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ARISSat-1 Telemetry
by Greg D. 14 Aug '11

14 Aug '11

Hi all, Got a partial verbal telemetry this 04:08z pass (and a perfect preloaded SSTV). I think it said that the internal temperature was 45c. Isn't that a bit toasty? The next parameter I thought I heard 65, whatever it represents. Battery voltage was 36.09v, current -4ma. The satellite was in low power mode (40 seconds on, 2 min off), though I believe it was still in sunlight until right at the end of the pass. Sorry for the partial, but someone was on the phone and kept talking while I was trying to listen... Greg KO6TH

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Batteries and High Power still working
by Luc Leblanc 14 Aug '11

14 Aug '11

>From www.arissat1.org >11 Aug 2001 >The Russian Silver-Zinc (Ag-Zn) battery that is powering ARISSat-1/RadioSkaf-B is the same battery that is used to power the Russian Orlan >space suits. The battery is designed for a lifetime of 5 deep charge-discharge cycles when used in the spacesuit. >Using it in a spacecraft going through 14 shallow charge-discharge cycles per day is new territory. 12 days since activation time 14 shallow charge-discharge cycles per day =168 shallow charge-discharge cycles "Is shallow = normal charge- discharge?" Some specs: Silver-zinc batteries are available off-the-shelf and have a higher specific energy (130 Wh/kg) and density (240 Wh/litre) than most other commonly available secondary batteries. High cost, limited cycle and shelf life, and a long recharging process reduce its overall attraction. While at normal discharge rates, 40 to 50 cycles can be expected from the battery, this reduces to 10 or 15 at high discharge rates. Cycle life is also reduced if the battery is discharged below 80% of rated capacity and thus, a 20% reserve is required at the end of the mission. Silver-zinc batteries have been used extensively in AUVs and their performance is reliable and documented. Their high cost and short life have, however, prompted consideration of alternative technologies. P.S. At 13 Aug 2011 04:44:03 UTC ARRISat-1 High Power mode has been reported over Australia Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE

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arissat-1
by jerry keeton 13 Aug '11

13 Aug '11

Voice @ 0240Z from em31hd ( in eclipse) meta 69 min. IHU 47 deg. c control panel temp 60 deg. c batt volt. 36.09 batt. current -8 ma Jerry WB5LHD

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ARISSAT-1 Voice Telemetry
by Matt Patterson 13 Aug '11

13 Aug '11

0233Z Latest voice telemetry.... plus a couple SSTV transmission... http://soundcloud.com/matthewpatt/arissat-1-rs01s-w5ll-08142011 73 Matt W5LL

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ARISSat Voice Tel
by WCP 13 Aug '11

13 Aug '11

Received 8-14-2011 UTC 1:12 EN71 Indiana Met ?? 7 min IHU Temp +47 C CP Temp +57 C Bat Volt +36.09 Bat Cur -12ma

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Re: satellite WAS S.C.
by k0vty＠juno.com 13 Aug '11

13 Aug '11

Your problem reminds me of my WAS last required state. It was my own state of NE I was the only sat operator in NE for a very long time Hope all is well Joe K0VTY ============ On Sat, 13 Aug 2011 22:21:25 +0000 (UTC) Bob- W7LRD <w7lrd(a)comcast.net> writes: > > > I was getting my cards ready to apply for sat WAS and I could only > find 49! I knew I worked South Carolina, but no card. So if > you're in S.C. email me for a sked on any satellite so I can get > this one more piece of wall paper. > > 73 Bob W7LRD > > CN87 > > Seattle > _______________________________________________ > Sent via AMSAT-BB(a)amsat.org. Opinions expressed are those of the > author. > Not an AMSAT-NA member? Join now to support the amateur satellite > program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > ____________________________________________________________ Online Masters Degrees AA, BA, BS, MA, MS, PhD Programs http://thirdpartyoffers.juno.com/TGL3141/4e4726597cb4b5fde3cst06vuc

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ARRISAT1 pass over VK 0017utc
by Colin Hurst 13 Aug '11

13 Aug '11

ARISSAT1 was on for the whole pass. Strangely no 1000 baud packets were decoded, which is a disappointment. CW copied is as follows. hi this is arissat1 rs01s ct1xi phi met 25 m ihu +41 c cp +47 c bat 36.09 v -12 ma rf 369 ma hi this is arissat1 rs01s ct1zx phi met 27 m ihu +41 c cp +48 c bat 36.05 v +0 ma rf 317 ma hi this is arissat1 rs01s dj4zc phi met 28 m ihu +41 c cp +48 c bat 36.13 v +0 ma rf 370 ma hi this is arissat1 rs01s f6bvp phi met 30 m ihu +41 c cp +48 c bat 36.05 v +0 ma rf 291 ma hi this is 73 Colin VK5HI

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ARISSat-1 over West Malaysia 13 Aug 2225 UTC
by Sion Chow Q. C. (9W2QC) 13 Aug '11

13 Aug '11

Dear All, ARISSat-1 was heard over West Malaysia during 13 Aug, 2225 UTC pass. The satellite was first heard in low power mode and subsequently it was in high power mode until LOS. A total of 27 telemetry frames were copied and forwarded, and subsequent replay of the I/Q recordings provided another 3 SSTV images and the following voice telemetry: MET - 10 min IHU Temp - +37C Control Panel Temp - +43C Battery Voltage: 35.58v Battery Current - -16mA (discharging) MET - 12 min IHU Temp - +37C Control Panel Temp - +43C Battery Voltage: 35.74v Battery Current - +4mA (charging) This was the 2nd pass using the FCD with DK3WN's Doppler Control for FCD + HDSDR + ARISStlm for automated copy. The FCD is a simply amazing piece of hardware :) 73, Sion Chow Q. C., 9M2CQC Also: WQ2C /HL1, 9V1QC, JG1XHM, ex: 9W2QC, AB3IO

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ARISSat-1 Report
by GW1FKY＠aol.com 13 Aug '11

13 Aug '11

Hi all, Pleased to inform that ARISSat-1 was active at 2201hrs zulu here in wales tonight (Saturday 13th August) The satellite came in from the south West and was in eclipse,I heard the FM voice announcement quite strongly including the status report on 145.950 Mhz before it then appeared to have switches status. Ken Eaton GW1FKY Amsat -UK Amasat NA

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