ARISSat-1/KEDR at +10 Days: ON-ORBIT and OPERATIONAL

SB SAT @ AMSAT $ANS-226.01
ARISSat-1/KEDR at +10 Days: ON-ORBIT and OPERATIONAL

AMSAT News Service Bulletin 226.01
From AMSAT HQ SILVER SPRING, MD.
August 14, 2011
To All RADIO AMATEURS
BID: $ANS-226.01

Hundreds of reception reports have been received since ARISSat-1/KEDR
was deployed from the ISS. Full operational capability of the satel-
lite 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 rec-
cecived image at:

His station configuration was:
Uplink HW: TS2000X, 435MHz, 5W RF power + 12 elements beam
Uplink SW: MMSSTV + HRD (doppler control)
Downlink HW: FunCubeDongle (SDR) + SP-2000 preamp + 2×6 elements
beam
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:

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

Also, the extensive list of ARISSat-1/KEDR media links in this week’s
ARISS Status Report, in a bulletin below.

[ANS thanks the ARISSat-1/KEDR Team for the above information]

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