Going from the extreme low RBW of 1Hz to the opposite spectrum, the YIG-tuned bandpass pre-selector (HP8566 and HP 8411) is like the powerful kryptonite crystal in Superman comics. It can tune much wider than the widest RBW IF and keep the IMD out of the mixer filters.
The YIG oscillator is the pinnacle of RF voodoo, like the microwave ferrite circular, very cool device.
Here is a reverse engineering S21 and power measurement of a RF power amp, it contains a circular which works like traffic going around a circular junction in RF amplifier at 9.30 minutes:
https://youtu.be/9AfuPAmymUU
That guy got all his mobile network base stations and RF amps from the skids.
Quote:
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t's several years now since I last used an HP8560 or 8563 in either the A or E versions. At work, these analysers have mostly been sold or scrapped. At one time there were dozens of them, and I used them on a daily basis. I can remember when the first HP8560A arrived at work and this must have been in the early 1990s. I spotted a dead 26GHz HP 8563EC sat sulking under a bench at work last week. It has a sweep fault and I suspect it will go in the WEEE skip soon. I think it is the last one left in the engineering labs.
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Many RF devices contain so much silver and gold that they are normally sent to these people to recycle them(duplexers). Zero health and safety protocol:
https://youtu.be/fTOaYsOzh1o