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So.. what about any cheap and good performing 192kHz sound interfaces, maybe USB? Maybe OEM version without enclosure?
As I've posted often already, I always test using the built-in Realtek HD card in my laptop, and I'm even using the headphone output which I'm connecting to the transmitter. Works great, after calibration it's almost as flat as a Marian (2 kHz modulation difference between a 5 Hz square wave and a 60 kHz tone). (But there is a very soft hiss audible which might be caused by the sound card - I need to test if it's also there with other cards. It's only noticeable during silence).