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發表於 18-8-2011 01:51:32
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ARISSat-1/KEDR at +10 Days: ON-ORBIT and OPERATIONAL
Hundreds of reception reports have been received since ARISSat-1/KEDR was deployed from the ISS. Full operational capability of the satellite has been confirmed in the 10 days since the start of the mission on August 3.
The satellite's power system monitors the battery voltage and switches between High power mode (continuous transmission) when sunlight is charging the battery and Low power mode (40 seconds transmit/2 minutes idle) when in eclipse. Telemetry data shows that 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. The data shows 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://tinyurl.com/3e5c2y8 (arissat1.org)
The effect of this is that ARISSat-1/KEDR remains in Low power mode for a period of time after exiting eclipse. The team recommend that users take advantage of the High Power mode as much as possible over the next few days.
435 MHz - 145 MHz Linear Transponder - OPERATIONAL
The linear transponder operates in Mode U/V (70 cm Up, 2m Down). It is an 16 KHz wide inverting passband. The convention is to TX LSB on the 435 MHz uplink and RX USB on the 145 MHz downlink. Several amateur radio operators have been reporting successful contacts via the linear transponder.
After the initial success with the linear transponder reported by KO4MA, K8YSE, KD8CAO, and JN1GKZ last week news of addition contacts have been received from amateur radio operators worldwide:
* Henk, PA3GUO uplinked an SSTV signal to the linear transponder and received the picture on the downlink. He posted a copy of the reccecived image at: http://www.pa3guo.com/pa3guo_arissat1_sstv_9aug2011_0258utc.jpg His station configuration was:
o Uplink HW: TS2000X, 435MHz, 5W RF power + 12 elements beam
o Uplink HW: TS2000X, 435MHz, 5W RF power + 12 elements beam
o Downlink HW: FunCubeDongle (SDR) + SP-2000 preamp + 2x6 elements beam
o Downlink SW: MMSSTV + DK3WN Satcontrol (doppler/freq control) + HDSDR
* Andre, ZS2BK reported a successful two-way CW contact with Pierre, ZS6A on August 5.
* Alex, VK5ALX reported a contact with Geoff, VK2ZAZ on August 6.
* Bruce, VE9QRP was able to access the linear transponder with 40 watts into a Lindenblad on TX and another omni on receive. Bruce commented, "It's an amazing thrill to work our AMSAT SDX for the first time, and my sense is that any VO-52 class station should be able to hear its downlink."
* Luciano, PY5LF had a contact with Roland, PY4ZBZ and recorded it:
http://www.youtube.com/watch?v=oJ2Gujm2vtc
145.950 MHz FM Downlink - OPERATIONAL
145.919 MHz CW Beacons - OPERATIONAL
The CW transmissions include the satellite callsign ID RS01S, select telemetry, and callsigns of people actively involved with the ARISS program.
145.920 MHz SSB BPSK-1000 Telemetry - OPERATIONAL
AMSAT needs your telemetry from ARISSat-1/KEDR. Since there are no "Whole Orbit Data" storage mechanisms onboard ARISSat-1/KEDR, your submissions are the only way for AMSAT to collect the spacecraft telemetry and KURSK experiment results.
* Recorded file ARISSat-1/KEDR and Kursk telemetry CSV files (in the ARISSatTLM folder) can be sent as an e-mail attachment to: telemetry@arissattlm.org
* If you are running ARISSatTLM and receiving the signal "live" from ARISSat-1/KEDR, please enable the telemetry forwarding option.
* The latest telemetry can be seen LIVE on your computer or cell phone at:
http://www.arissattlm.org/mobile
Peter Miller, W1AMJ, the Hartford Hobby Radio writer published a story about the deployment of ARISSat-1 in the Hartford Examiner newspaper and at: http://tinyurl.com/4yo3l2m (Examiner.com)
NASA Education Office is getting the word out on ARISSat-1 in their article, "Hammin' It Up":
http://www.nasa.gov/audience/foreducators/hammin-it-up_prt.htm
[ANS thanks the ARISSat-1/KEDR Team for the above information]
Send For Your ARISSat-1/KEDR Certificates
When you receive the downlink signal from ARISSat-1/KEDR you are invited to send your report to the following e-mail boxes. You will receive a PDF certificate by e-mail.
Students and school groups are especially welcome! We look forward to your report!
Your report must contain the following information:
* The signal you received:
o the secret word*
o an SSTV image, or
o telemetry data
* Your name or group name
* The date/time of reception
* Your e-mail address of where to send your certificate. You will receive a PDF certificate via email.
Here are the e-mail boxes to send your reports:
* Secret word* contest to: secretword@arissat1.org
* SSTV image to: sstvreport@arissat1.org
* Telemetry data to: tlmreport@arissat1.org (either digital or voice report of the data you received)
* Received BPSK telemetry and .CSV files should continue to be sent to:
telemetry@arissattlm.org
* Those who do hear the secret word or call sign please do not put it out to the world. That would ruin the contest for those still waiting for their station to be in range.
You can find the details of the ARISSat-1/KEDR radio frequencies, links to telemetry decoding software and mission details on-line at:
* http://www.amsat.org
* http://arissat1.org
ARISSat-1/KEDR can be accessed on these frequencies:
* 145.950 MHz FM Downlink
* 435 MHz - 145 MHz Linear Transponder
* 145.919 MHz CW Beacon
* 145.920 MHz SSB BPSK-1000 Telemetry
The latest telemetry can be seen LIVE on your computer or cell phone at:
http://www.arissattlm.org/mobile
TRACK STATUS on OSCAR STATUS PAGE
David Carr, KD5QGR has added ARISSat-1/KEDR to the list of satellites at the popular "Live OSCAR Satellite Status Page" at: http://oscar.dcarr.org/ You are invited to submit your reports on this page.
[ANS thanks the ARISSat-1/KEDR Team for the above information]
Reminder: The DARA Matching Gift Challenge Runs Until September 1
Donate to AMSAT and DARA will contribute matching funds. The Dayton Amateur Radio Association (DARA) fund raising challenge for AMSAT continues until September 1, 2011. DARA will match $1.00 for every $3.00 donated up to $5,000.00.
AMSAT kicked off the fundraising campaign at the Hamvention, where donations began count for the challenge. Please consider making a donation to AMSAT and have your effort multiplied. We appreciate DARA's support for AMSAT!
Your donation will support our "Getting AMSAT Back Into Space" campaign by providing needed funds for AMSAT Project Fox Cubesat which will provide a 2M to 70cm FM transponder matching the performance of AO-51.
* On-line at the AMSAT Store: http://www.amsat-na.com/store/donation.php
* You may click on the donation widget on our http://www.amsat.org web page.
* You may call Martha at the AMSAT Office:
From the US call toll free at: (888) 322-6728
From all other locations call: (301) 589-6062
and you can send a fax to: (301) 608-3410
* You can send donations by postal mail to:
AMSAT-NA
850 Sligo Ave #600
Silver Spring, MD, 20910 |
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樓主: VR2GY
發表於 14-8-2011 01:14:05
