There are many other factors that influence FTP throughput, including maximum segment size (MSS), TCP window size,...
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the content of the file itself, the number of hops between client and server, utilization of links between those hops, utilization of the FTP client and server systems, and NIC configuration. You should eliminate all other running applications on the client and server system, make sure that your FTP client and server are the only systems using the wireless and wired network, minimize the number of hops between then (including hubs and cable runs).
Use large enough files so that each FTP session runs for minutes, not seconds. Repeat your tests using identical files, dropping high and low results, then averaging the rest, until results appear to be consistent. Testing in this fashion can yield directly-comparable measurements -- for example, to compare throughput measured by a given station at 30 feet vs. 60 feet, or to compare throughput for the same station using two different wireless NICs. The fewer variables you change between tests, the more directly comparable your results.
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