This report describes the test procedures and results of the product evaluation for the SR-3001 Radio Inter-Operability System (RIOS). The RIOS is an audio gateway device manufactured by SyTech Corporation. An audio gateway device (also called an audio matrix or a cross-band switch) links disparate radio systems to support communications interoperability between dissimilar wireless systems. Such a device simply passes baseband (audio) signals from the receiver portion of one radio to the transmitter portion of a dissimilar radio system.