Spirent TAS4500 Flex RF Channel Emulator Spirent TAS4500FLEX RF Channel Emulator The TAS 4500 RF Channel Emulator Provides a Convenient, Thorough approach for Testing Wireless Communications Equipment by Emulating the Delay, Fast and Slow Fading, and Path loss characteristics of RF Mobile Communication Channels. The 4500 Allows Thorough Testing in a Laboratory Setting and Drastically Reduces the Time Required for Product Tests. The 4500 Can Be Used to Test a Wide Range of Wireless Voice and Data Communication Equipment, Including Cellular Telephones, Cellular Modems, Personal Communication Terminals, Wireless LANs, Pagers, Wireless Network Equipment, and Much More