Touching again on OBW before moving on, in the other discussion I asked Burt to explain the procedure he uses to measure occupied bandwidth.
Burt replied:? "For occupied bandwidth measurements I use an Anritsu MS2721B spectrum analyzer.? I set the span to 100 kHz, the RBW (Resolution Bandwidth) to 100 Hz, and VBW (Video Bandwidth) to 30 kHz, and also use peak store.? With the repeater in use that has a mix of fully quieting and noisy signals I let the analyzer sweep for 10 minutes or longer."
?
The industry procedure uses the same 100 Hz RBW and since the goal of the OBW test pattern is to simulate normal modulation, either should produce comparable results
?
Once the trace is acquired most modern analyzers will compute the 99% OBW value at the touch of a button.? This will provide a baseline record for comparison to industry expectations and for comparison when experimenting with different transmit audio processing.
