1. Use Kepler's law to check the accuracy of a given period and altitude for an Iridium satellite.
2. Use Kepler's law to check the accuracy of a given period and altitude for a Globalstar satellite.
3. Find the efficiency of the AMPS protocol in terms of simultaneous calls per megahertz of bandwidth. In other words, find the number of calls that can be made in 1-MHz bandwidth allocation.