Sample telemetry length for SNOX missions was ~85 bytes each message. Estimate 72 hours at 2 msgs per hour = 12kb
Self-contained GPS, Batteries and one-way sat modem.
Alexei Karpenko's hacking of the SPOT
Radio Cost: $150 Service Cost: $99/yr
Orbcomm will not directly sell service plans for less than $2500/month. Resellers do sell less. - Reports from customers of high latency, data dropouts of up to a day.
Elevations from: http://www.gpsvisualizer.com/elevation
Approximate Ground Station Locations:
Sells service using 6-byte messaging service. Price is based on number of 6-byte messages transferred.
P7 (150x6bytes = 900bytes): 14.65/month
P14 (2000x6bytes = 12000byes): 75.46/month
$37 one-time account activation fee (not per radio)
$13 Euro Gateway one-time activation fee paid at setup time (not per radio)
$9 Modem swapout charge when one radio is lost and replaced with the next
Billing is month-to-month, no contract. Pay by check or credit card. Email them when ready to start.
Latency: 15 minutes to 1 hour, ~1 hour is usually when only one of their 4 satellite planes is overhead, usually every 12 weeks. Typically closer to 15 minutes.
Contacted, suggested we use Iridium instead for critical reliability concerns.
1.6GHz LEO Satellite network - very low latency messaging.
Radio Cost: $490 ea
First 12KB per month = $30-40 each additional 1kb = $1.50. (Rough quote from Airsis C.Morton)
More reliable than Orbcomm. Lower latency than Orbcomm. Messages sent via email. Minimum billable message: 10 bytes. C.Morton will look into possibly waiving the activation fee when each modem is lost and a new one has to be activated for the next flight.