PA3GUO SEEDS II Experiments

SEEDS PA3GUO SEEDS PA3GUO SEEDS PA3GUO
SEEDS PA3GUO
CubeSat was advocated by the Prof. Twiggs at the Stanford university in USSS(University Space System Symposium) in 1998. Then, Nihon University starts the development of CubeSat in 1999, and the research and development has been advanced. The knowhow of the development of CubeSat was acquired by developing a mock satellite "CanSat" which autonomous flies from the high degree 4000m to the destination at the first year of development. The simulation of SEEDS operation is ended on June 14, 2005.And, SEEDS was launched on July 26, 2006. Unfortunately, the launch was failed becouse of rocket's engine trouble.
We developed 2nd SEEDS after failure. And 2nd SEEDS was launched from Satish Dhawan Space Center, India in April 28th 2008. source: SEEDS website (see below)


SEEDS Project website

Frequency 437.485 MHz
Frequency deviation plus minus 1750 Hz
CW transmission power 90 mW
FM transmission power 450 mW


July, 06, 2008

Observed SEEDS-II during a pass with an maximum elevation of 90 degrees.
Signal was very clear and strong, with slow variation due to rotation.
Equipment: TS2000X, 2x8 element beam, no pre-amp.

At only 1.0 degrees elevation the downlink signal was still well audible, 20 dB above noise:


July, 01, 2008
11:15utc

Recorded SEEDS at the very end of a pass, and discovered it was in 1k2 FM packet mode.
Frequency 437.485 MHz. Antenna: 2x8 element beam, no pre-amp.
SEEDS-II FM Packet 1k2 mp3 recording (12 seconds)

JQ1YGU*>JQ1YGV  
F0 F9 61 05 28 00 00 40 D7 00 00 00 01 
00 01 00 01 00 00 00 00 0B 43 0B 88 0A 
10 0B 97 0B 27 0B 68 00 05 00 08 00 06 
00 04 00 05 00 06 0C 7D 0F FD 08 3C 07
8F 0B 10 10 A7 08 B8 07 E4 09 2A 09 30 
08 04 08 77 88 C1 09 58 08 D8 09 85 

20:35utc
89 degrees elevation pass, 437.485 MHz, SEEDS back into CW:


                                            ...b07af8aedb3b1100000001000100018d7a304030
jq1ygu seeds g40348ddc1d87ffe008007000000dc421cb15af8afbb461100000001000100018d7b304030
jq1ygu seeds g40348e1a9d38ffe9a3000000000a63008b1daf3b07b4c1100000001000100018d7c304034
jq1ygu seeds ...

Very strong downlink, noise-free !

June 12, 2008

Recorded SEEDS at the very end of a pass, from 9 to 4 degrees elevation.
Satellite was in digitalker mode, and transmitted, amongst others, the 'secret code' and SSTV picture.
Both samples I submitted on the SEEDS website in order qualify and receive the QSL cards.

mp3 recording of the SEEDS digitalker 'secret' code
ps:this recording has been edited: the code is recoded, else it wouldn't be secret anymore :-)

SEEDS SSTV PA3GUO

May 03, 2008

SEEDS has for the second day been put in FM mode. Transmissions consist of speech and SSTV signals. At the bottom of the images the callsign (JQ1YGU) is due to the noise barely visible, but present.

mp3 recording of the FM transmission of SEEDS: Speech (text) + SSTV (image)

SEEDS SSTV PA3GUO   SEEDS SSTV PA3GUO

April 29, 2008

CW telemetry recording of SEEDS


       seeds g4 0013eealb8 ffe 007 ...
                                   ... .06 000 000 008 ed0 aa0 aa0 aa5 b07 1 1 0000 0001 0001 0001 0b76 0640 34
jq1ygu seeds g4 0014eti.ab ffe 007 12c 000

April 28, 2008
Satellite launched.