20130522 Current Flashing Plan: 29th May 04:57:00 - 04:59:00 (UT) Colorado USA (10Hz Green) From 30th May to 4th June, the temperature of FITSAT increses by full sunshine. So we can not flash LEDs during these term because of heat problem. The following graph shows the last full sunshine on 3rd Jan. The data was provided by Colin VK5HI.
20130518 Current Flashing Plan: 20th May 09:03:30 - 09:05:30 (UT) Colorado USA (10Hz Green) 20130517 The orbiral plane of NIWAKA faces to the sun around 1st June. Niwaka will be full sunlit, and all temperatures of NIWAKA will increase. If you could receive the beacon (437.250MHz, CW), the telemetry data will show an interesting graph. JA0CAW sent me the graph of NIWAKA illuminatted by the sun around the full sunlit. The black strip shows the time of shade. 20130515 5.8GHz Problem: As we didn't download the whole pictures at the deployment, we hesitated to send a new shutter command. But, this caused the trouble. In order to generate 2W RF-output, it needs more than 15W DC-input. As the weight limit of Cubesat, we couldn't attach enough heat sink for 5.8GHz transmitter. The transmitter sends 20 pictures at a time. One picture is sent with 2 to 6 sec. So, we placed 5 sec interval between sending pictures for heat diffusion. End of this January, we try to download the whole picture again. The first picture was normal, but the second one continues 16 minutes. Probably, the picture size became FFFF... because of volatilized memory. I thought the final IC was burned. We sent a new shutter command over Australia to refresh picture memory. The front camera and the rear camera took 20 pictures alternately with 5 sec interval. Then we sent the download command on 6th February. The 5.8GHz transmitter was not burned, but the transmitter changed to send only one picture. The first picture by the front camera took the sun. The latest experiment, we couldn't receive 5.8GHz signal, though we got acknowledge of download command in 437MHz. (last picture from NIWAKA on 6th Feb.)
20130514 Current flashing plan: 20th May 09:03:00 - 09:05:00 (UT) (tentative) Colorado USA (10Hz Green) 20130509 FITSAT Japanese web-page moved to: FITSAT Japan 20130506 Current flashing plan: 8th May 06:46:00 - 06:48:00 (UT) (tentative) Argentina (10Hz Red) 14th May 01:18:00 - 01:20:00 (UT) (tentative) Israel (10Hz Green) 20130414 We have failed to send delay command for 15th Apr. because of thunder. 20130413 I was surprised at: "JR5EPQ took 4 pictures of 5 flashings (3,5,7,11,13 Apr.) over Japan". (1) 20h46m25s(JST) 3rd Apr. (2) 20h47m10s(JST) 3rd Apr. (3) 01h46m26s(JST) 11th Apr. (4) 01h05m35s(JST) 13th Apr. 20130411 11th Apr. 23:12:35 - 23:14:35 (UT) (set) 20130410 Current Flashing Plan 11th Apr. 23:13:00 - 23:15:00 (UT) (tentative) Italy (10Hz Green) 15th Apr. 03:31:30 - 03:33:30 (UT) (tentative) NY, Boston (10Hz Green) 20130408 8th Apr. 06:41:24 - 06:43:24 (UT) (set) New York (10Hz Green) 9th Apr. 23:53:28 - 23:55:28 (UT) (set) Italy (10Hz Green) 20130405 Miss Yumiko Kuribayashi took a picture of flashing NIWAKA at Oguni Kumamoto, Japan on 3rd Apr. She uesd Canon EOS 5D Mark3, Sigma APO 70-200mm F2.8, ISO12800, T=5sec, 200mm, f2.8 20130404 Current Flashing Plan (Time adjusted using latest TLE) 8th Apr. 06:41:00 - 06:43:00 (UT) (tentative) New York (10Hz Green) 9th Apr. 23:53:30 - 23:55:30 (UT) (tentative) Italy (10Hz Green) 11th Apr. 23:13:30 - 23:15:30 (UT) (tentative) Italy (10Hz Green) 15th Apr. 03:32:30 - 03:34:30 (UT) (tentative) New York (10Hz Green) 20130328: Current Flashing Plan (Time will be adjusted using latest TLE): 8th Apr. 06:44:30 - 06:46:30 (UT) (tentative) New York (10Hz Green) 9th Apr. 23:56:00 - 23:58:00 (UT) (tentative) Italy (10Hz Green) 11th Apr. 23:17:00 - 23:19:00 (UT) (tentative) Italy (10Hz Green) 15th Apr. 03:43:00 - 03:45:00 (UT) (tentative) New York (10Hz Green) 20130316: Current Flashing Plan: 17th Mar. 15:37:00 - 15:39:00 (UT) South West Australia (10Hz Red) 18th Mar. 13:03:30 - 13:05:30 (UT) South East Australia (10Hz Red) (postpone) 3rd Apr. 17:53:00 - 17:55:00 (UT) (tentative)Israel (10Hz Green) 20130312: Current Flashing Plan: (failed to send command) 16th Mar. 13:35:30 - 13:37:30 (UT) South East Australia (10Hz Red) 17th Mar. 15:37:00 - 15:39:00 (UT) South West Australia (10Hz Red) 3rd Apr. 17:53:00 - 17:55:00 (UT) (tentative)Israel (10Hz Green) 20130306: Current Flashing Plan: 7th Mar. 11:39:30 - 11:41:30 UTC South West Australia (10Hz Red) (postpone)14th Mar. 02:12:30 - 02:14:30 UTC Israel (10Hz Green) 20130219: Mr. Kaneyuki Yamamoto, Hatano Kanagawa Japan took flashing NIWAKA at 23:52:11 (JST) on 13th Feb. using Kenko SE250N 1200mm, shutter=6sec, LPS-P2 filter, Canon EOS6D ISO12800. 20130215: Current Flashing Plan: 17th Feb. 06:41:30 - 06:43:30 UTC Buenos Aires Argentina (10Hz Red) 19th Feb. 0r:16:00 - 06:18:00 UTC Mar del Plata Argentina (10Hz Red) 14th Mar. 21:27:30 - 21:29:30 UTC (tentative) Israel (10Hz Green) 20130214: Mr. Yujiro Suzuki, Kimizyu Chiba Japan took flashing NIWAKA last night using the lens f=180mm F2.8, shutter=6sec, ISO3200x2 body. (very faint) 20130213: Flashing plan added: 14th Feb. 21:28:00 - 21:30:00 UTC South Europe (10Hz Green) 14th Mar. 21:27:30 - 21:29:30 UTC (tentative) Israel (10Hz Green) 20130212: Flashing plan added: 13th Feb. 22:28:00 - 22:30:00 UTC France, Swiss, Italy,... (10Hz Green) 20130210: We have noticed that NIWAKA increses its rotation speed. Time of one cycle was 33 sec at 12 Nov. But, now it is 12 sec.
The graph shows the voltage of each solar panel. The changing voltage shows NIWAKA turns around Z-axis from +X(blue), +Y(red), -X(green), -Y(purple).
I plot the period(T:blue), frequency(F:red), and freq^^2 (energy:green) from 2nd November 2012.
I have no idea on the reason. Let me know if you have any idea. NIWAKA does not have any mechanism like Crookes radiometer. Its structure is almost symmetry around Z-axis.
20130208: We have received the optical report from Mark K9GX that Mr. Don Spain took the picture. We have not confirmed yet. 20130203: Plan changed: 6th Feb. 01:21:30 - 01:23:30 UTC KY,IN,OH,WV,IL USA (10Hz Green) 20130131: Flashing plan added (time will be changed by the latest TLE): 9th Feb. 09:32:30 - 09:34:30 UTC CA, OR USA (10Hz Green) (changed) 17th Feb. 06:43:30 - 06:45:30 UTC Buenos Aires Argentina (10Hz Red) (changed) 19th Feb. 06:18:00 - 06:20:00 UTC Mar del Plata Argentina (10Hz Red) 20130129: Flashing plan added (time will be changed by the latest TLE): 1st Feb. 13:53:30 - 13:55:30 UTC Beijing China (10Hz Green) (changed) 6th Feb. 01:21:00 - 01:23:00 UTC KY,IN,OH,WV,IL USA (10Hz Green) 20130123: Current flashing plan (time will be changed by the latest TLE): (changed) 1st Feb. 13:51:30 - 13:53:30 UTC Beijing China (10Hz Green) (changed) 9th Feb. 09:30:00 - 09:32:00 UTC West Coast of USA (10Hz Green) 20130121: We have learned through the experiments of flashing NIWAKA: 1. The night sky mast be dark enough such as to see the milky way. 2. Successful photos use around F4, 400mm lens and ISO12800 camera. 3. Most people noticed their success after took photos and magnified. This means the camera must be turned to the accurate direction, and shuttered at exact time. Multiple shutters will be useful. 4. The green beam always turns to the magnetic north, and the red beam terns to the magnetic south, so the beams do not turn to the ground around the equator. In order to observe the light, higher latitude will be good result. As observing the light is not so easy, we will flash the light on requests. If you have a plan for observing the light, please advice me the time and date with your latitude and longitude. Now we have a plan for flashing at 09:25:00 on 9th Feb. for the west coast of USA. 20130116: Mr. Shozo Sasaoka JR5EPQ took a photo of flashing NIWAKA this morning. I was surprised because it was taken in north path through high elevation. 20130113: Miss Jodie Reynolds K6JLR and Mr. Will Bierman took nice photos of flashing object (f=40mm, 2.5sec exposure), 2013.01.11.13:53:07 2013.01.11.13:53:24 but not confirmed. As it was just before dawn, other satellites were also bright by sunlit. 20130111: New flashing plan (tentative): 12th Jan. 15:38:00 - 15:40:00 UTC SE Australia (10Hz Red) 14th Jan. 11:02:30 - 11:04:30 UTC Central USA (10Hz Green) (changed) 15th Jan. 22:26:00 - 22:28:00 UTC Wulmuqi China (10Hz Green) (changed) 17th Jan. 20:22:48 - 20:24:48 UTC Central India (10Hz Green) 19th Jan. 03:19:00 - 03:21:00 UTC North Italy (10Hz Green) 20130108: I have noticed the followings by Mr. Simone Corbellini's advice: The orbital plane of NIWAKA was right angle to the Sun around 3rd Jan. This means NIWAKA appears at dawn or dusk all over the world. Now it appears before dawn, but NIWAKA may bright by sunlit. So, the flashing light may not have enough contrast. Please use this chance as exercise of observation. ISS is closer to NIWAKA these days, and ISS may bright by sunlit. So, two satellites may be pictured. 20130106: Flashing LED plan was made by weather forecast: 10th Jan. 23:57:30 - 23:59:30 UTC New Delhi India (10Hz Green) 11th Jan. 13:52:30 - 13:54:30 UTC San Francisco USA (10Hz Green) (following plan changed by weather problem, see 20130111) 20130104: AMSAT-DL team at Bochum Germany succeeded to generate pictures from 5.84GHz signal. 20130101: We have received many "Happy New Year"s. The most interesting one was sent by Mr. Janos Tolgyesi HG5APZ. 20121223: Magnitude of flashing NIWAKA is 7 to 8. The light is faint. In order to observe, Observation Guide for FITSAT-1 will be helpful (in Japanese). 20121222: The 20m dish of Bochum Germany has received 5.84 GHz signal from NIWAKA. The beam width (3dB) of the dish is only 0.18 deg. 20121219: As the sky is not dark enough by the Moon, we will start the next experiments of flashing NIWAKA around 7th Jan. 2013. 20121217: New flashing plan: 18 Dec. 05:28:30 - 05:32:30 (UTC) Central-South USA (Morse, Green) 20121215: Flashing plan: < stop:bad weather> 18 Dec. 05:46:00 - 05:50:00 (UTC) Brazil (Morse, Red) < stop:bad weather> 19 Dec. 04:47:00 - 04:49:00 (UTC) Equator of South America (Morse, Green) 19 Dec. 18:33:30 - 18:37:30 (UTC) India (Morse, Green) 20 Dec. 16:21:00 - 16:25:00 (UTC) SE Australia (Morse, Red) Schedule may be changed. 20121214: Mr. Tadashi Hayashi of Toyama Science Museum took a movie of flashing NIWAKA (10Hz mode) this morning. Flashing NIWAKA (movie AVI 490MB) Flashing NIWAKA (movie MPG 144MB) 20121212c: Flashing plan: 14 Dec. 22:54:30 - 22:56:30 (UTC) South Europe (10 Hz mode) 15 Dec. 08:11:30 - 08:13:30 (UTC) W.Coast of USA (10 Hz mode) 20121212b: Mr. Tsuyoshi Watanabe took a fine picture of NIWAKA this morning. It flashes 10 Hz mode. "Watanabe picture" 20121212a: We have set the dely command to flash LED over NE of USA. It will start flashing at 6:14:35 (UTC) on 12 Dec. 20121207: As Christmas Eve is full moon, we start flashing LEDs as: 12 Dec. 6:14:30 (UTC) for US (2 minutes with Morse Code) 13 Dec. 22:10:30 (UTC) for Europe (4 minutes with Morse Code) The schedule may be changed. I would like to thank Mr. Simone Corbellini. His web-page will help to fined NIWAKA and also the observation area for LED-light: Web Based Observatory 20121205: We have sent QSL(veri-card) for the reports received since the deployment. I am very sorry the delay. If you could not receive in these 2 weeks, please let me know. The address may be wrong. 20121202: New pictures we have got successfully until now:
20121201: AMSAT-DL team received the 5.84 GHz signal at Bochum Germany. 20121127: The figure shows temperature changes during 450 minutes, almost 5 cycle around the world. The blue, red, green, violet lines show 3 cell battery, single battery, +Z and -Z panels.
20121126: The first experiment of flashing LEDs was observed in Kurashiki Japan and Daejeon Korea. We appreciate Mr. Kazuhisa Mishima of Kurashiki Science Center and Prof. Jun-Ho Oh of Korea Advanced Institute of Science and Technology. The LEDs were driven in detecting faint light mode. As this picture is tracked, the line of LED-light is shorten.
20121117: DF3GJ tries to match the slopes of a sine curve to the audio signal of beacon. It shows a period of 28.5 sec.
20121115: JA1OGZ received the 5.84GHz signal form NIWAKA with 50cm Dish with 2.5t Helix: "JA1OGZ received signal" 20121114: This figure shows 5.84GHz spectrum from NIWAKA (measured on the ground). Though the frequency deviation is +,-,50kHz, the 99% energy spreads over 415kHz. The 90% energy may be less than 300 kHz.
20121113: Old FM-radio (not software radio) will work for 5.84GHz FSK-detector. It has 300kHz band width. Convert the 5.84GHz frequency to FM-radio. FM-radio can receive 76MHz-90MHz in Japan, Other countries may be 90- 108MHz. It depends on the country. Pick up the signal just after FM-discriminator. Change the analog signal to digital by a comparator. 20121112: New data shows NIWAKA is rotating around Z axis with term of 33 sec. This data is sampled aroud the equator at dusk.
20121111: N1JEZ received the 5.84GHz signal form NIWAKA which was sent above Vermont USA. "N1JEZ received signal-1" "N1JEZ received signal-2" 20121110: I thought NIWAKA swings with a period of 40 sec by the signal strength of beacon (North path). This coincides with the period of swing by magnetic force on the ground. But, ...
20121109: We receive the latest TLE from: http://celestrak.com/NORAD/elements/stations.txt 20121107: JA0CAW shows the 5.84Ghz signal from NIWAKA as: "JA0CAW received signal" 20121106: We will start 5.84GHz transmission experiments of your place. Please advice the best time for the transmission and also your latitude and longitude. In the north hemisphere, south path will be good. As the 5.84GHz patch antenna always faces to the magnetic north, south hemisphere may be difficult. The 5.84GHz signal transmits 128 byte packets. Each packet continues for 12 msec at 115.2kbps. Between packets, there is a 8 msec blank (only carrier, non-modulated) which is the time for reading memory. So the packet cycle repeats with a 20 msec (12msec + 8 msec) period. An FM detector with therefore generate a 50 Hz audio signal (1/20msec). NIWAKA sends 20 pictures at a time in around 2 to 3 minutes. There is a 5 second interval (with no 5.84GHz signal) between pictures due to a heating problem in the final IC. Each picture takes 2-6 seconds to transmit. If a picture is only black space, it takes less than 2 seconds. We ourselves have not yet succeeded in receiving the whole set of 20 pictures. We would appreciate it if you are able to receive these pictures. Data errors have damaged the images as received here, but those damaged images indicate that there are two more pictures of the ISS. Receiving a 5.84GHz signal from a satellite is itself difficult, so we would appreciate a report of any detection or reception of this signal. 20121104: Probably, a part of another satellite F-1.
20121027: New pictures from NIWAKA by 5.84GHz. (rear camera)
20121025: Flashing LED may be good for Christmas Eve. 20121023: Second picture from NIWAKA by 5.84GHz. --> 20121027 NIWAKA was deployed around Hawaii. 20121021: Flashing LED test had not started yet. It will start after down-loading all the 20 pictures at the deployment. 20121020: First picture from NIWAKA by 5.84GHz
20121018: JA1OGZ received 5.8GHz signal. 20121018: JA0CAW received 5.8GHz signal. 20121016: We received temperatures, voltages and currents stored in response to remote commands. These signals (437.445MHz, AX.25 packet 1200bps) are replies to remote commands. They can be received only local area. ... 20121006: We have received many signal and telemetry reports. All reports indicate that FITSAT-1 has started working. 20121005: FITSAT-1 was deployed from ISS at 15:44 on 4th October (UTC).
All circuits are designed by JA6CYY Mr.Takakazu Tanaka who is the founder of Logical Product Corp. and now he is the chairman of the company. We appreciate him that he opened his designs to public.  5.84GHz to 440MHz converter (LNB)  5.4GHz local oscillator for converter  DC-power supply to LNB through coax  10.7MHz discriminator for 115.2kbps FSK  Power Supply for FITSAT-1  5.8GHz system explanations from hardware  5.8GHz TX unit Block Diagram
I appreciate Timothy HB9FFH who made a telemetry decoder for FITSAT-1. It is available from the Carpcomm website: http://carpcomm.com/satellite/fitsat1 One of our student also made the similar software on windows: http://turing.cs.fit.ac.jp/~fitsat/CWFM/FITSAT_CW_Analyzer1.zip All programs for 5.84GHz are developed on Linux. A simple shell script controls receiving data and displaying pictures. Here is tgz file which we have developed.
 Takushi Tanaka, Takakazu Tanaka: "Development of a 5.8GHz-band High Speed Communication Radio Module for Small Artificial Satellites", Bulletin of Information Science Isnt., Fukuoka Inst. Tech., vol.20, pp.1-6, 2009 (in Japanese).  Kenta Tanaka, Takushi Tanaka, Yoshiyuki Kawamura: "Development of The Cubesat FITSAT-1", UN/Japan nano satellite symposium, 2012.  Yuka Mizoguchi, Kaihua FENG, Takanori Soda, Toshiki Otsuka, Tatsuro Kinoshita, Kohei Nishimoto, Yoshiyuki Kawamura, Takushi Tanaka: "Observation of The LED signal from FITSAT-1", UN/Japan nano satellite symposium, 2012.  Yoshiyuki Kawamura, Takushi Tanaka: "Emission of LEDs from a ultra small satellite", The 418th Topical Meeting of the Laser Society of Japan, 2012 (in Japanese).  Takushi Tanaka, Yoshiyuki Kawamura, Takakazu Tanaka: "Overview of FITSAT-1", The 53rd Symposium on Space Science and Technology in Japan, 2012 (in Japanese).