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Cheap and Small Dynamic Signal Analyzer?

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Berni:

--- Quote from: maxwell3e10 on August 18, 2020, 08:06:25 am ---
--- Quote from: KE5FX on August 18, 2020, 06:02:38 am ---+1 to that.  The 89410A / 89441A is one of the most underrated boxes around. 

--- End quote ---
Looks promising and maybe a little cheaper than a used SR780, plus a color CRT, that's progress!

--- End quote ---

Not only that. It even supports LAN connectivity (But you will need some rather ancient networking gear to make that work)

electrolust:

--- Quote from: Berni on August 18, 2020, 05:39:27 am ---But there are spectrum analyzers that go down to actual DC:
https://www.keysight.com/en/pd-1000002367%3Aepsg%3Apro-pn-89410A/vector-signal-analyzer-with-w-cdma-capability-dc-to-10-mhz?cc=SI&lc=eng


--- End quote ---

sure, i mean if you need a local gravity source.

the question i was responding to was why aren't there new, spectrum analzyers, at LF. I agree, the performance of RF devices gets poor at the lower frequencies. But eg the picoscope 4262 is an FFT device, and the Bode 100 I think has good performance? I haven't studied them so not sure if I'm just speaking nonsense.

The LF option on the E5061B does seem designed for LF LCR measurement, I guess it can replace a second device you would otherwise need to have, and isn't suitable for signal analysis in general.

I did just miss out on an 89410A on ebay. Most of them seem priced around $1000 and this one was an actual auction, not buy it now. it went for $150 I think. Maybe that was you that scored this great deal. There are no recent sales though, so at $1000 they aren't exactly flying off the shelves. A deal could probably be struck.

Berni:
Yeah i got my 89410A from a cheap biding where nobody seamed interested in it, forgot the figure but i think it was in the range of possibly being more expensive to ship than it was to actually buy. The overly optimistic sellers that want 1000$ for it are probably just seing others listing it for so much so they do it too. I don't think it is worth 1 grand, it is a neat instrument with impressive performance but its far from world leading performance these days and it is indeed very big, very heavy and consumes a surprisingly large amount of power.

I'm guessing that these sort of instruments have faded in to obscurity due to modern digital scopes with FFT. Sure the scopes are still behind in terms of performance, but if you are clever with external low noise amplifiers you can still make them do most jobs. So i guess similar reason why high speed equivalent sampling scopes have gone forgotten, the regular real time digital scopes simply got good enough to replace them.

Still someone could make a modern miniaturized version of a DSA using modern ADC/DAC chips and a powerful MCU, much like the NanoVNA is a miniaturized but still perfectly usable network analyzer (really it is surprisingly good for the size and price):
https://nanorfe.com/nanovna-v2.html

electrolust:

--- Quote from: Berni on August 18, 2020, 05:36:30 pm ---Still someone could make a modern miniaturized version of a DSA using modern ADC/DAC chips and a powerful MCU, much like the NanoVNA

--- End quote ---

Isn't "Multi-Instrument" that? and PicoScope 4262? Or do you (or OP) specifically mean self-contained like NanoVNA.

maxwell3e10:
I'd want a self-contained instrument, not USB, with a DC-1 MHz frequency range, a SAR ADC and 100dB SNR.

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