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Yes. I remember those old HP analyzers well...along with the poloroid camera for taking screen shots. Yes, a tight resolution BW is essential. When I worked at the monitoring station back in the late 70s and early 80s, we used to measure HF military multitone teletype circuits. 16 encrypted circuits (32 distinct frequencies) on a single voice channel. We had to tighten the res bw up as tight as it would go and use a really slow sweep. Good luck!