http://firstmonday.org/issues/issue8_1/nichols/index.html Many of the references in Nichol's paper are also quite interesting.
James Lux, P.E. Spacecraft Radio Frequency Subsystems Group Flight Communications Systems Section Jet Propulsion Laboratory, Mail Stop 161-213 4800 Oak Grove Drive Pasadena CA 91109 tel: (818)354-2075 fax: (818)393-6875
