Template:SEDSAT-2 Interface Communications

Inputs edit inputs

To: Communications - Power - power to terminal node controller, 45 mA
To: Communications - Power - power to antenna
To: Communications - Power - power to transceiver, 200mA @ 3.3V (average)
To: Communications - Power - power to amplifier
To: Communications - Ground Station - commands for satellite control
To: Communications - Payload - data to be transmitted to ground station (?) Unless this goes to CDH which then transmits it to Communications?
To: Communications - Command and Data Handling - data that needs to be transmitted to the ground station (such as ADCS, Payload, systems)
To: Communications - Test - Test bus input
To: Communications - Structures - Transceiver, 40 x 80 x 20 mm, 70g (approx)
To: Communications - Structures - Main board, 80 x 80 x 10mm, 50g (approx)
To: Communications - Structures - Antenna, 50 x 50 x 15mm, 100g (approx)

Outputs edit outputs

From: Communications - Ground station - data from payload and ADCS will be transmitted to ground station.
From: Communications - Structures - dimensions of the circuit board housing the communications subsystem modules. It was suggested that there be only one board on which all the components of the satellite may be slotted. This will probably save us a LOT of space.
From: Communications - Structures - Heat from the operation of the components.
From: Communications - CDH - Hard reset signal.
From: Communications - Test - Test Bus output

Environments edit environments

On: Communications - Temperature - it will affect the functioning of some of the components in the subsystem.
On: Communications - Orbit - LEO will require us, most probably, in the UHF range.
On: Communications - Proximity to ground stations - Cannot transmit data if there is no radio link with ground station.
On: Communications - Frequency - The frequencies assigned to us by the IARU will also be a constraint.