I often design equipment for ham radio use, and occasionally some of them work :-) earlier in my career I had a fun time doing VSAT Satellite Earth station engineering, with spectrum analyzers, 70 MHz IF, satellite modems, up/down converters, HPA, SSPA etc. etc. Miss those days while I am earning a Ph.D .. if I'm lucky. I was looking for a low-cost spectrum analyzer to help in diagnosing the RF circuits and EMI/EMC/RFI that my boards/modules are producing. There is a cheap unit on ebay called "Anritsu ME453C Microwave System Analyzer Receiver" - can this be used as a spectrum analyzer? If so, what are its usable specs?