Project log (Latest update : DEC 25 2020)
ALL INFO CONTAINED HERE ARE PRELIMINARY
AND SUBJECT TO RADICAL CHANGES
PROJECT OF A COMMUNICATION PICO/FEMTO SAT
Design, build, test and launch a HF satellite aimed at low-Doppler
operations, ispired by HFSat project proposed by Bob Bruninga,
and recommendations by Hans Van Groenendaal and Ray Soifer.
Use as much as possible, commercial off-the-shelf components, for
low cost and easy reproduction.
Open hardware and software, to allow to replicate the design, for
Demonstrate that an average skilled tecnician could produce such
communication assembly without high-end professional equipment
for measure and test.
BASIC COMMUNICATION PAYLOAD
- A 70cm beacon working in standard CW, and possibly, DFCW and
Slow CW modes.
- A 70cm 2GFSK telemetry beacon.
- A 21/29 Mhz "RadioRosto-Sputnik" transponder, suitable for
non-linear narrowband modes (NFM, CW, PSK31, and digimodes) and
linear modes (SSB, AM).
- A H/U transponder (redundant).
- A 29 Mhz standard-CW beacon (redundant)
It's advantageous that a 10-meters downlink can be received by all
traditional RX's and high-end SDR's, but also by cheaper RTL based
dongles, while 15-meters uplink is easily achievable with standard
50+ watts HF rigs.
- Into a pico/femtosat
- Into a standard 1U Cube Sat
- Suborbital testing on a stratospheric balloon
The complete communications system is to be arranged on four
48x48 mm PCB's, to be stacked in a pico/femtosat, mounted as
"piggy-back" or integrated on a standard cubesat PCB card, or
stitched into a Suitsat container.
PCB Card A : Combi transponder (including PA's)
PCB Card B : Beacons (including PA's)
PCB Card C : Battery, onboard computer and power management
PCB Card C : void
- Maximum simplicity
- Minimum current consumption, for possible battery-only op.
- As much as possible, use low-cost, off-of-shelf components.
- As usual, employ radioamateur frequency bands, for ease of
bureaucracy,and abundant ham ground stations already present.
- LEILA system option
I gratefully thank these companies for support:
- Rogers Corp.
A special thank to Analog Devices Inc.
Testing, testing, testing !
Requirement definition and component identification.
Evaluate and test best options.
Testing in ordinary terrestrial conditions
Obtain maximum performance in terrestrial conditions.
Testing into space-like conditions, and qualify materials
Apply for licensing (IARU, etc.)