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Siglent SSG3000X and SSG5000X series RF Signal generators
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nctnico:
AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too.
tautech:

--- Quote from: nctnico on August 26, 2019, 12:35:49 pm ---AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too.

--- End quote ---
Yep, in the absence of the internal SDG3kX IQ HW option they do this:



Defpom lifted the lid on mine in the vid linked on the previous page but the IQ HW is not installed in the base models.
nctnico:
That solution is getting rather expensive and as usual I'm wary of bugs especially when it comes to equipment which serve a niche market. I really need to propose a tried & tested solution so I'm still hoping someone with hands-on experience generating IQ modulated signals can chime in.
tautech:

--- Quote from: nctnico on August 26, 2019, 12:42:47 pm ---That solution is getting rather expensive and as usual I'm wary of bugs especially when it comes to equipment which serve a niche market. I really need to propose a tried & tested solution so I'm still hoping someone with hands-on experience generating IQ modulated signals can chime in.

--- End quote ---
Sure I get that but do the sums vs SSG plus IQ and then compare what you have for the outlay, a SSG that can be improved  ;) plus a well featured 16 bit AWG that can also be improved.  ;)

Like I mentioned, jump over to the SDG6kX thread and see who's using IQ in them.

Further info, it seems you need a PC connected to SDG6kX to do IQ.
http://siglentna.com/wp-content/uploads/dlm_uploads/2017/12/SDG6000X_UserManual_UM0206X-E01A.pdf
P65/198
2.3 To Set IQ Waveform (Optional)
The SDG6000X can be used as an IQ waveform generator, providing ASK, PSK, QAM, FSK, MSK and multi-tone signals. The EasyIQ software is necessary when using SDG6000X to generate an IQ waveform. The EasyIQ is a PC program used to download IQ baseband waveform data to the SDG6000X through a USB or LAN device interface.

EasyIQ PC program is free for download from the SDG6kX Software page on Siglent websites:
https://siglentna.com/service-and-support/firmware-software/waveform-generators/#sdg6000x-series
TheUnnamedNewbie:


--- Quote from: nctnico on August 26, 2019, 12:35:49 pm ---AFAIK to generate an IQ modulated signal you need a dual channel function generation and an RF generation which has an IQ modulator. Come to think of it... an R&S SMIQ might do the job too.

--- End quote ---

Depends on how fast your IQ has to go, and how fast your AWG is. You can have an AWG output an IQ signal around a non-DC carrier, and then mix it in a simple AM-modulation signal generator.



--- Quote from: tautech on August 26, 2019, 12:51:53 pm ---
Further info, it seems you need a PC connected to SDG6kX to do IQ.
http://siglentna.com/wp-content/uploads/dlm_uploads/2017/12/SDG6000X_UserManual_UM0206X-E01A.pdf
P65/198


--- End quote ---

That is a real downer. There are some basic things which a generator such as this should be able to generate built-in (basic QAM/QPSK/OOK/etc modulations with simple PRBS lengths, for instance). I use these types of measurements a lot, and needing to get out a computer everytime would be somewhat annoying.
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