COMS Meeting Notes 15.05.2007

Space Research Centre, 17:30 -19:00

Orbital Considerations

Two Line orbital elements (TLEs) - all orbiting satellites have numbers assigned to give details of orbit. These are generally given as six Keplerian elements
* Inclination (i)
* Longitude of the ascending node (Ω)
* Argument of periapsis (ω)
* Eccentricity (e)
* Semimajor axis (a)
* Mean anomaly at epoch (Mo)

Given this information, Amateur Radio operators and others worldwide will know when each individual CubeSat will be above their horizon and how to receive, capture and decode telemetry. Recovered telemetry data can then be forwarded to CubeSat project teams as a valuable resource to spacecraft operations. CubeSat information required for this support is collected below.

For more data and information on TLEs:
Current TLEs for Cubesat, view here,

W0RPK (American Radio ham), includes TLEs for all current cubesats.
Amateur Radio Information and Support for CubeSats -
Modulation methods!!!

More information at - North American Amsat, Archives > Bulletin Board > Daily Archives

High inclination launch Kazakhstan? Vega/Ariane V launch vehicle?
Note: ISS 51˚ inclination, covers most of ground stations here.

STS Plus is a useful free application to use which allows you to follow the position of the space shuttle and of an extended artificial satellites database across the globe and to calculate their visible passes over your location.

Heavens-Above is a good website that shows real-time satellite, ISS, and Space Shuttle orbital pass information, maps, and star charts.

Ground Station Management

Audio frequency shift keying (AFSK)

Approx. 10 minute pass !?

Call sign DK3WN - Mike Rupprecht - decode programs for telemetry

Communication requirements

Transceiver - Microhard 450MHz transmitter available? 2.4GHz too much, too large a doppler shift. In fact 2.4 GHz is frequency used by Wi-Fi in this country.

CalPoly use of 435MHz? Antenna - see what they have done with these frequencies.

900MHz, also can't get license

Looking for:

  • 1200 Baud
  • TNC (Terminal Node Controller) serial port to participate in AX.25 packet radio networks for housekeeping data
  • FM single channel, integrated modem
  • 435MHz -> 437.5MHz
  • Output power 500mW, no more

Need to check import/export restrictions, licenses

Can we make this kit ourselves?
Use of European kit better for licensing?

Vibration & vacuum testing required.

Need to draw up a list of numbers needed to make fit i.e. space quantifiability!!! Fundamental calculations.

Funding/ possible activities with Cubesat

RadFet - good school project, measuring radiation doses.

Use of TCPIP (Transmission Control Protocol / Internet Protocol). Send stickers - radio amateurs send telemetry/ house-keeping data to website, send them sticker of mission.

EMDA (East Midlands Development Agency) projects ; help with economic development in science and engineering:

Amsat Colloquium 2007

Held in about the last weekend in July, held at SSTL (Surrey Satellite Technology Ltd.). Recommended at least one person from Cubesat team goes to this! Dylan and Ryan have shown interest and have said they would go. Possible funding from SRC!?

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