Tandem packet-radio systems are considered. The nodes of the tandem have infinite buffers, they share a common radio channel for transmisison of data packets and each node transmits whenever it has a packet ready for transmission. An approximate analysis is developed for an arbitrary tandem. The approximation uses the exact results obtained for a four-node tandem and is based on exploiting the special features of tandem systems. The approximation is compared with simulation results and very good agreement is observed. Copyright © 1987 by The Institute of Electrical and Electronics Engineers, Inc.