1 Fundamentals of Spectrum Analyzer Junfeng Engineer of Equipment Testing Division State Radio Monitoring Center wangjf ***@.cn +(86)10-68368866-1807 Radio Monitoring and Spectrum Management Training (China,23-31,May,2005) 2 Contents Fundamentals of Spectrum Analyzer ? Why do we use a spectrum analyzer? ? What can we do with a spectrum analyzer? ? How many types are there for spectrum analyzers? ? The classic superheterodyne spectrum analyzer Illustration of test cases 3 Fundamentals of Spectrum Analyzer Why do we use a spectrum analyzer? What can we do with a spectrum analyzer? How many types are there for spectrum analyzers? The classic superheterodyne spectrum analyzer 4 Analyzing a RF signal Time domain ? Oscilloscope Waveform S(t) Frequency domain ? Spectrum analyzer Spectrum F{S(t)}=S(f) Frequency and amplitude information Modulation domain ? Vector signal analyzer Vector information Frequency, amplitude and phase information 5 Analysis in time domain X(t) Complicated in time domain 6 Analysis in time domain 7 Analysis in frequency domain F{X(t)}=X(f) Simpler in frequency domain 8 Why do we use a spectrum analyzer? Easier to verify each ponent of the signal looked plicated in time domain Easier to check what happened in band, in out-of- band domain and in spurious emission domain Easier to allocate and assign the frequency for regulatory agency with assistance of the statistics from spectrum monitoring 9 Fundamentals of Spectrum Analyzer Why do we use a spectrum analyzer? What can we do with a spectrum analyzer? How many types are there for spectrum analyzers? The classic superheterodyne spectrum analyzer 10 What can we do with a spectrum analyzer? Frequency and amplitude test Channel power and spectrum power density test Wanted signal spectrum mask test Adjacent channel power test Spurious emission test Occupied bandwidth test Spectrum monitoring Etc.
