FITSAT-1 Received on 5.84GHz

FITSAT-1, 5.84GHz signal was received it for the first time by JA0CAW
at 15:07-15:17 UTC, 16 Oct 2012.



35cmDish + Down Converter + LNA + FCD + HDSDR and HEX-Left_4
Down Converter is the same as UNITEC.
LNA is made with MMIC-BGA2717.
[Reference] Niigata Club SouthGate AMSAT-UK [Doppler Shift] AOS 5840.120 2401.554 1280.027 435.159 145.828 5840.060 2401.530 1280.015 435.155 145.827 TCA 5840.000 2401.500 1280.000 435.150 145.825 5839.940 2401.470 1279.685 435.145 145.823 LOS 5839.880 2401.446 1279.673 435.141 145.822 145 band ... +- 3kHz 430 band ... +- 9kHz 1200 band ... +- 27kHz 2400 band ... +- 54kHz 5800 band ... +- 120kHz Example for the interface AOS 2401.377 --> 145.377 TCA 2401.323 --> 145.323 LOS 2401.269 --> 145.269 AOS 5840.120 --> 1284.120 TCA 5840.000 --> 1284.000 LOS 5839.880 --> 1283.880 FITSAT-1, 23:12-23:21JST, 19 Oct 2012, Ele 22 NW-W-S, by JA0CAW Doppler5841_ja0caw [amsat-bb] Re: FITSAT 5.84GHz received From: Peter Guelzow To: Mineo Wakita Date: Sat, 20 Oct 2012 10:49:16 +0200 Hi Mineo, can we help with our 20m dish in Bochum? What is the exact frequency and modulation/data format? Do we need special hardware? best wishes Peter DB2OS AMSAT-DL President On 20.10.2012 08:25, Mineo Wakita wrote: > Ground Stations say as follows. > > At first we think to take down the photograph which FITSAT took at the > time of release by the first priority. And we test it at the time to > pass south around 45 degrees of the ground station. The range that we > can receive is limited at present. We think to have the amateure ham > of the other countries participate in this experiment of 5.84GHz after > we took down the photograph which FITSAT took when KIBO released it. > > We sent a command last night and took down some image data. Because we > received it while correcting Doppler by hand, there were quite many > errors. We were able to restore an image a little when we revised the > error data by hand. And a solar panel of ISS came out. If we can be > restored to the original state neatly, we will open it to the public. > > JE9PEL, Mineo Wakita [amsat-bb] Re: FITSAT 5.84GHz received From: Takushi Tanaka Date: Sat, 20 Oct 2012 20:10:09 +0900 These days, we are testing 5.8GHz without plan to learn their characteristics. We will make the plan until the end of this month. Please receive the 5.8GHz signal. We will find the orbit which passes over the south of your town. The 5.8GHz beam always turns to the magnetic north. 73 Takushi, JA6AVG First picture from NIWAKA by 5.84GHz, 20121020 Ground Station says to AMSAT-DL as follows, 20 Oct 2012. > I appreciate your offer of 20m dish. > The exact frequency is 5840.000 MHz. > > The RF signal is modulated with FSK of 115.2kbps digital picture data. > Frequency sift is +,- 50kHz, but the spectrum spread over 300kHz. > As we use a simple FSK, FM detector directly generates the signal for > serial-port(RS232C) of PC. The discriminator of FM-radio (IF=10.7MHz) > may be available by removing de-emphasis circuit. > > A jpeg-picture data are sent by packets. Each packet consists > of 128 byte: > > packet-ID data-size picture-data verify > (2 byte) (2 byte) (122 byte) (2 byte) > > Namely, the first 4 bytes and the last 2 bytes do not consist the > photo data. Data-size of all packets except the last is 122(=7A hex). > > A jpeg-picture data starts with "FFD8" and ends with "FFD9". > The jpeg picture is made by connecting the data part of each packet by > removing the first 4 byte and the last 2 byte. > > 20 VGA-pictures are sent at a time. Each picture is sent around 4-6 sec. > There is 8 msec interval between packets. and 5 sec interval between > pictures. > > Please find the block diagrams and circuit schematics in JA6AVG web-page: > New pictures from NIWAKA by 5.84GHz, 20121027 (rear camera) (front camera) 5.84GHz transmission from NIWAKA Wrote by GS, JA6AVG 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. [Supplement] FitSat 5.84GHz Video by JA0CAW System: 38cmDish+4tuneHEX+Converter(IF1284)+Lna+FunCubeDongle+HDSDR FitSat 5.84GHz Video by JA1OGZ System: ANT 50cm TDK-502, FEED 2.5t Helical, CONV Kuhne, 5.84G/435MHz NF:1.0 GAIN:14dB, 5DFB 25m feed, Funcube Dongle, S/W SDR-Radio FitSat 5.84GHz Report by JA3UMZ System: KDD-BS352, Ceburon circuit, PLL oven crystal, TS-790, 1280-SSB mode [SDR softwares] fitsat5.84-1111-2044.wav(received by JA0CAW) played by JE9PEL/1 Fitsat584G_Spectrogram [Spectrogram]
Function -> F1 Scan Input -> High Band Limit -> UP
Sound Recoder -> File -> Open
-> Effects -> Decrease Volume -> Play
Fitsat584G_SDR# [SDR#]
IQ file(*.wav) -> Select
Check in USB -> Play
Right slide bar -> Adjust Contrast
Fitsat584G_HDSDR [HDSDR]
Soundcard -> Select
Check in USB
Options -> Select Input -> WAV file
Fitsat584G_SpectraVue [SpectraVue]
InputDevice -> Wave File -> Wavefile In Setup -> Select File
Choose 'H Waterfall' etc. and Demod On -> Check in USB
Right click in Span Frequency (0.096000MHz) -> Start-F12
Input Source -> Play IQ Data File
Check in USB
The lower part, Play IQ Data File -> Select -> Play
5.84GHz pictures, 4Jan2013 I received the 14 pictures which were photographed by FITSAT-1, 5.84GHz from a member who belonged to AMSAT-DL and Bochum Observatory, Germany. They which were got by 20m_Dish are the pictures wonderful all. (C)FITSAT-1 GS image3 image4 image5 image6 image7 image8 image9 image10 image11 image12 image13 image15 image16 image17 JE9PEL extracted the good pictures and improoved the brightness of the pictures, used "further brightness correction". fitsat_image0 fitsat_image3 fitsat_image4 fitsat_image7 fitsat_image8 fitsat_image11 fitsat_image15 > Subject: Re: FITSAT 5.84 GHz > From: Mario Lorenz > Date: Fri, 4 Jan 2013 01:48:45 +0100 > > Wishing you and the FitSat-1 crew a happy, healthy & successful new year, > AMSAT DL & Bochum Observatory proudly present attached images. > > These finally got decoded from the Dec 22 pas. Out of the > 18 bursts we have seen that time, 4 could not be demodulated. > We hope that some of the remaining 14 are new in your collection. > > Best regards, > > Mario, DL5MLO > on behalf of the whole team --------------------------------------------------------------------------- FITSAT-1 5.84GHz 2013-02-14 Video by JA0CAW 5.8GHz Problem, 15 May 2013 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 was 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. 5.8GHz transmitter still works. It sent one picture on 21 May 2013, but we could not generate the picture because of error data.

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