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Sylvain Munaut 246tnt at gmail.com> can the USB to VGA adapter output quadrature I and Q pairs via the red and > blue channels? with maybe using green as a configurable local oscillator. Sure, we thought about that. But : - IQ modulator chips are not cheap and you'd need to low pass I/Q before injecting them there. - The LO range would be quite restricted because for a LO you want a clean signal (no hamonics, or as litte as possible, and as little jitter as possible) so you'd have to use a freq way lower than the sampling rate and filter it. But then you have like ... 0 - 35M LO, not super useful. Using an IQ mod with built in LO and control it via I2C is much more viable ... but more expensive (several times the price of the vga dongle in the first place) Cheers, Sylvain