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In Reply to: RE: This is interesting where Dave is comparing an old HP dedicated Spectrum analyzer posted by Triode_Kingdom on May 14, 2016 at 09:31:53
I don't think this video is useful. He frequently points to the HP and says that its busier display indicates superiority."You must have perceived it different than what I did.What I heard him say was,the HP and Tek Scope were both reading useful information at the 1khz and 10khz range at about the same rate but when got to 100hz and below,the picture became a lot more clear and more useful on the HP because the picture was obviously better in what you could determine.Now whether that is useful to a designer today is open to conjecture.The Tektronix showed the fundamental as well as the HP as well as the first few harmonics but the noise floor looked much more clear on the HP then on the Tektronix.
This by no means said that new equipment is not as useful as the old equipment for audio.What it did say was,a dedicated audio analyzer is going to be better than one that is compromised built into an oscilloscope.
A friend you get for nothing,an enemy has to be bought
Edits: 05/15/16Follow Ups:
Sorry, but nothing in that demo leads me to believe that the HP presents an "obviously better" picture, or that it is more easily interpreted. In fact, I would question whether it's even as accurate as the 'scope. Among other things, there seem to be considerable spurious responses around the 2nd harmonic viewed early in the video. He sees them too, but shows no concern as to their origin. That's another fail for this evaluation.
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Buy Chinese. Bury freedom.
HP from the late 70s died again.I changed the 12V regulator and the pin diodes in the AGC three years ago and it worked really well until last week.
I got it working again when I changed some weak power supply filter caps but the calibration is way off after 107mhz and this is 900mhz gen.
Even at 200mhz I could go in and align a 2 meter repeater even tho I don't have one.
Anyway,I'm looking at this one.
A friend you get for nothing,an enemy has to be bought
I'm not familiar with the Marconi gens, the only thing I would say is to be sure it has the output calibration and attenuation capabilities you need. Where I work, all the gens have a rotary knob for output level. Some are digitally stepped, others (particularaly the > 5 GHz models) use a meter and analog dial. Having rotary control for this is convenient for checking amplifier compression, but if you're not doing much design or production work, it may not be so important.
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Buy Chinese. Bury freedom.
it seems kind of goofy when you are running the control up and down to control the output..My HP 8903b dist analyzer is also digitally stepped but you can use the up and down arrow keys to control volume output but it can still be sort of a pain,especially if you just happen to need a number in between the stepped range to read the best distortion.It doesn't happen often but it does happen on occasion and that's when I use the oscillator with the analog output.
A friend you get for nothing,an enemy has to be bought
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