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3.54 GHz. The actual mixer frequency sent to the IF stage is the VCO frequency divided by a number between 2 and 63 -- so the possible center frequency tuning range ends up being in the range of ~24 MHz to 1.77 GHz. However, I was wondering if it would be possible to use a MixDiv of 1 -- to run the mixer frequency directly on the VCO? Has anyone tried that, or would it fry the device somehow? Just wondering if the range could be extended (disregarding any sensitivity issues, of course). -- Per.