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Advantest R3477 9kHz to 13GHz spectrum analyzer

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cncjerry:
Hey nctnico, when are you going to post more pictures?  I'm thinking about one of the analyzers.

nctnico:

--- Quote from: cncjerry on August 17, 2016, 09:07:13 pm ---Hey nctnico, when are you going to post more pictures?  I'm thinking about one of the analyzers.

--- End quote ---
What kind of pictures would you like? I think I have shown more of the inside than I wanted to already  :P

cncjerry:
I'm looking more for signal work, primarily how it does with low level signals. Also, a very low RBW (averaged) of the calibration signal with a span of 1.2Khz.  I would like to see how the line noise sidebands look.  One of the issues with my 8568B and 8566B is the noise sidebands are more prominent than I would like.  So with a -10dBm signal from the calibration port, you can see very small peaks at +/- 120hz.  The peaks on my 8568B are down about 100dBc and the 8566B are -92dBc.  The 8566B started out really bad (-72dBc) until I reworked the cable paths adding a steel plate between the cables and transformer inside the analyzer.  It was recently one of the longer threads on HP/Agilent group.  I would like to see how much better the Advantest does. withj internal line noise.

So any low level (or even high level) signals with a 10hz RBW and a span of 1.2K would be helpful.  On the 8568 and 8566 you have to VBW average to see the low level line noise peaks.

Thanks

nctnico:
I tried to find those spikes (I'm in 50Hz country so I guess I would be looking at 100Hz sidebands) but I can't see them. First I tried the calibrator output but that seemed to have a lot of noise. Then I tried a -70dBm 100MHz sine wave (from an HP E4421B) so I only get the noise from the SA itself but still no spikes.

rf-loop:

--- Quote from: nctnico on August 18, 2016, 11:47:36 pm ---I tried to find those spikes (I'm in 50Hz country so I guess I would be looking at 100Hz sidebands) but I can't see them. First I tried the calibrator output but that seemed to have a lot of noise. Then I tried a -70dBm 100MHz sine wave (from an HP E4421B) so I only get the noise from the SA itself but still no spikes.

--- End quote ---

Your marker is around -80dBc in first image  and in previous msg cncjerry talk aput -100dBc peaks. Your noise level is 20dB over this level where he look sideband peaks.  Next image your marker is around -60dBc  if 50Hz modulation sidebands are at this level it mean quite high 0.2% (am) modulation.  If you see there in this case 50Hz sidebands ...well...something is failed and need repair. :-DD

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