Firefly CubeSat Mission to Study Lightning

Firefly_CubeSatFirefly carries a Very Low Frequency (VLF) receiver covering from a few ten’s of Hz to to tens of kHz to measure the radio waves emitted by lightning. It was launched November 20 on a Minotaur-1 rocket and NASA have released a video about the satellite.

The YouTube description reads:

Somewhere on Earth, there’s always a lightning flash. The globe experiences lightning some 50 times a second, yet the details of what initiates this common occurrence and what effects it has on the atmosphere – lightning may be linked to incredibly powerful and energetic bursts called terrestrial gamma ray flashes, or TGFs — remains a mystery. In mid-November, a football-sized mission called Firefly, which is funded by the National Science Foundation, will launch into space to study lightning and these gamma ray flashes from above.

The NSF CubeSat program represents a low cost access to space approach to performing high-quality, highly targeted science on a smaller budget than is typical of more comprehensive satellite projects, which have price tags starting at $100 million. The CubeSat Firefly, by focusing its science goals, will carry out its mission in a much smaller package and at a considerably lower cost.

The Firefly mission also emphasizes student involvement as part of the ongoing effort to train the next generation of scientists and engineers. Students at Siena College, in Loudonville, N.Y., and the University of Maryland Eastern Shore, in Princess Anne, Md., were involved in all phases of the Firefly mission.

Watch NASA | Firefly Mission to Study Lightning

This video is public domain and can be downloaded at: http://svs.gsfc.nasa.gov/goto?10645

Commands for WREN SSTV Released

WREN - Image credit Stadoko

WREN – Image credit Stadoko

It is believed that the SSTV PocketQube WREN is currently in a mode where it beacons on 437.405 MHz for 1.6 seconds then listens for 6 minutes on that frequency for any commands. If none are received it goes to sleep for 2 minutes before transmitting the beacon again.

The WREN team have released the following information on their Facebook page to enable radio amateurs to activate the WREN SSTV transmitter.

BASIC COMMANDS

Commands to WREN are sent by toggling the carrier [of a FM transmitter]:
Carrier on/off: 1=long, 0=short, leave a noticeable silence between the bits.

• Activate/HK: 110011
• wait until answer [should be within 2 seconds]
• Camera ON: 11111
• wait until answer
• Snapshot & Thumbnail receive: 110
• decoder should display thumbnail picture 12*14 pixel can repeat this command until something useable appears
• SSTV send: 110100
• martin-1 SSTV picture comes… in 320×240 pixels color

Wren should answer to the commands within two seconds.
Wait always at least two seconds after having received data before sending to WREN

Notice:
Send the Activate/HK command first, else WREN won´t react to other commands.
When camera is OFF, a snapshot or SSTV command will send WREN into sleep mode. ALWAYS SWITCH CAMERA ON FIRST BEFORE SENDING CAMERA COMMANDS.
WREN´s housekeeping data will show the status of camera power (ON or OFF).

PS: A preliminary commanding software will come soon.
Special wishes for PTT control? VOX, RS232-RTS Pin etc ?

The Telemetry Decoder and an Audio File of the beacon are available at http://we.tl/TkWEuhIlnF

Hope you can catch WREN and have fun commanding it.

Cheers, Paul

WREN on Facebook http://www.facebook.com/StaDoKo

WREN a Ham Radio Slow Scan TV PocketQube Satellite
https://amsat-uk.org/2013/10/24/wren-a-ham-radio-sstv-pocketqube/

Dnepr Yasny launch https://amsat-uk.org/satellites/dnepr-november-2013/

FUNcube-1 Command Success

FUNcube-1 Monitoring Station at the NRC Bletchley Park

FUNcube-1 Monitoring Station at the NRC Bletchley Park

GB2RS have released a video of the moment the first command to FUNcube-1 was sent by Wouter Weggelaar PA3WEG.

Watch AMSAT FUNcube-1 command success at RSGB National Radio Centre

BBC TV visit FUNcube station at RSGB National Radio Centre
https://amsat-uk.org/2013/11/22/bbc-visit-funcube-station-at-rsgb-national-radio-centre/

FUNcube-1 Deployed !!! https://amsat-uk.org/2013/11/21/funcube-1-deployed/

First Transponder Test https://amsat-uk.org/2013/11/22/funcube-1-ao-73-transponder-tested/

First Fitter Message Uploaded https://amsat-uk.org/2013/11/21/ao-73-first-fitter-message-uploaded/

Delfi-n3Xt 2400 bps BPSK decoded in Japan

Delfi-n3Xt Satellite

Delfi-n3Xt Satellite

Decoding the Delfi-n3Xt 2400 bps BPSK beacon on 145.870 MHz has proved to be very challenging but Tetsurou Satou JA0CAW in Japan has succeeded in decoding some frames.

He decoded three frames of telemetry in two passes on November 27.

In a recent update Jasper PC4JB from the Delfi-n3Xt team said:

We have noticed however that the DUDe telemetry client does not properly indicate the frequency offset and it is very difficult to get a lock on the signal.

Also our ICOM910 receivers have too limited bandwidth to receive a 2400 bit/s BPSK signal properly (although we had a few packets decoded with this, so it is just on the edge of what is possible). We now use only AR5000 in combination with an SDR to record a wide spectrum in IQ files. This way we can replay the files and retune the signal again and have been able to decode more packets than before. This morning at our second pass we were lucky to have a real time lock on the signal and retrieve many packets, so it is possible to have it right at once. But of course we would like to get the ‘luck-factor’ out of it.

A few people will look into the Costas PLL inside DUDe to see if we can improve its performance.  Meanwhile, you can regard Delfi-n3Xt as a real challenging game to decode packets…

JA0CAW website in Google English http://tinyurl.com/JA0CAW

Delfi-n3Xt telemetry reception http://www.delfispace.nl/operations/delfi-n3xt-telemetry-reception

Delfi-n3Xt http://www.delfispace.nl/operations/radio-amateurs

Dnepr Yasny launch https://amsat-uk.org/satellites/dnepr-november-2013/

WREN heard on 437.405 MHz

UB4UAD screenshot of WREN signal received Nov 26, 2013 at 06:47:13 UT

UB4UAD screenshot of WREN signal received Nov 26, 2013 at 06:47:13 UT

Dmitry Pashkov UB4UAD may have received the first signal from the WREN PocketQube on 437.405 MHz (+/- 10 kHz Doppler).

The WREN team would welcome any further reports. The length of the AFSK-modulated beacon is 1.6 seconds.

The Telemetry Decoder and an Audio File of the beacon are available at http://we.tl/TkWEuhIlnF

Dmitry was using these TLEs:

WREN
1 99922U 13066G 13326.48861818 -.00000055 00000-0 00000+0 0 75
2 99922 097.8066 039.1177 0023760 211.9046 148.0730 14.86334042 151

Source: Dmitry Pashkov UB4UAD http://ub4uad.ru/?p=2917

UB4UAD site in Google English http://tinyurl.com/UB4UAD

WREN on Facebook http://www.facebook.com/StaDoKo

WREN a Ham Radio Slow Scan TV PocketQube Satellite
https://amsat-uk.org/2013/10/24/wren-a-ham-radio-sstv-pocketqube/

Dnepr Yasny launch https://amsat-uk.org/satellites/dnepr-november-2013/

FUNcube-1 Whole Orbit Data Displayed

FUNcube-1 Whole Orbit Data

FUNcube-1 Whole Orbit Data

Whole Orbit Data from the FUNcube-1 (AO-73) amateur radio spacecraft can now be displayed.

Dave G4DPZ writes:

FUNcube-1 shows part of MSE experiment

FUNcube-1 shows part of MSE experiment

We can now display 104 minutes of Whole Orbit Data captured within the satellite and we are working on getting the scaling factors such that all values can be displayed within the same range e.g. Volts instead on mV, Amps instead on mA. etc.

Part of the MSE experiment is nicely represent in the graph on the right:

Heating and cooling when the spacecraft is in sunlight as indicated by the Solar Cell (PV1) voltage.

We will be moving on to High Resolution data next and then mechanisms for downloading the data for local analysis.

Enjoy!

73 Dave, G4DPZ

BBC TV visit FUNcube station at RSGB National Radio Centre
https://amsat-uk.org/2013/11/22/bbc-visit-funcube-station-at-rsgb-national-radio-centre/

FUNcube-1 Deployed !!! https://amsat-uk.org/2013/11/21/funcube-1-deployed/

First Transponder Test https://amsat-uk.org/2013/11/22/funcube-1-ao-73-transponder-tested/