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Bode plot up to a few 100 MHz
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joeqsmith:

--- Quote from: Martinn on October 03, 2023, 11:43:13 am ---...
I have used a VNWA for this https://www.sdr-kits.net/introducing-DG8SAQ-VNWA3 , but the installation is somewhat quirky. Very powerful instrument though.
Probably other USB VNAs would also do. With NanoVNA output amplitude does not seem to be adjustable, which makes amplifier measurement quite uncomfortable (needs fiddling with attenuator kit).
...

--- End quote ---

Are you inferring that the VNWA3 does have a leveled output that can be adjusted?  Does it also have sinewave drive?  None of the low cost ones I have looked at do.  They also don't have bias Ts, are only 2-port 1-path .....   

Physical size, you never mention what sort of amplifiers but just thinking if you were playing with something in the kW range, I imagine the attenuators will be much larger than the VNA.   
dophuc:
In the Rigol DHO800 Review Video "EEVblog 1566 - Rigol DHO800 12 Bit Oscilloscope" at minute 54:58, I see Dave using the Rohde & Schwarz MXO4 Series to evaluate the Bode Plot measuring probe with integrated 100Mhz waveform generator. That machine is the dream of many people because of its price when purchased with the "100 MHz waveform generator" option  ;D

https://youtu.be/S8jrpCoZyx8?si=98JFR9S5V3ep6WYF&t=3298
tautech:

--- Quote from: dophuc on October 04, 2023, 02:21:35 am ---In the Rigol DHO800 Review Video "EEVblog 1566 - Rigol DHO800 12 Bit Oscilloscope" at minute 54:58, I see Dave using the Rohde & Schwarz MXO4 Series to evaluate the Bode Plot measuring probe with integrated 100Mhz waveform generator. That machine is the dream of many people because of its price when purchased with the "100 MHz waveform generator" option  ;D

--- End quote ---
200 MHz model = € 8,280  :o
https://www.batronix.com/shop/oscilloscopes/Rohde-Schwarz-MXO44-242.html
dophuc:

--- Quote from: tautech on October 04, 2023, 02:45:11 am ---
--- Quote from: dophuc on October 04, 2023, 02:21:35 am ---In the Rigol DHO800 Review Video "EEVblog 1566 - Rigol DHO800 12 Bit Oscilloscope" at minute 54:58, I see Dave using the Rohde & Schwarz MXO4 Series to evaluate the Bode Plot measuring probe with integrated 100Mhz waveform generator. That machine is the dream of many people because of its price when purchased with the "100 MHz waveform generator" option  ;D

--- End quote ---
200 MHz model = € 8,280  :o
https://www.batronix.com/shop/oscilloscopes/Rohde-Schwarz-MXO44-242.html

--- End quote ---

This price does not include the "Waveform generator" and "Bode Plot" options, adding these 2 options costs about €3400 excluding tax  ;D
Martinn:

--- Quote from: joeqsmith on October 03, 2023, 11:18:39 pm ---Are you inferring that the VNWA3 does have a leveled output that can be adjusted?  Does it also have sinewave drive?  None of the low cost ones I have looked at do.  They also don't have bias Ts, are only 2-port 1-path .....   

Physical size, you never mention what sort of amplifiers but just thinking if you were playing with something in the kW range, I imagine the attenuators will be much larger than the VNA.

--- End quote ---
Yes, VNWA has an adjustable output. See this document on page 241: https://www.sdr-kits.net/documents/VNWA_HELP.pdf
Here's an example of what I want to accomplish:
https://www.eevblog.com/forum/projects/measuring-switch-mode-supply-noise-hp461a-replacement-ada4895/msg4652395/#msg4652395
The last graph (frequency response up to 200 MHz) was measured using a VNWA. Power levels are small signal only, so no kW attenuators.
To my knowledge none of the low cost (< $1000) VNAs have a sine output (VNWA3 certainly does not).
If you know of a RF signal generator with sine output and programmable attenuator for < $2000, let me know.
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