Sylvain Munaut wrote:
> It's not generated from a DDS. It's from a xilinx PLD, then through an L and 
> then through a C to the RF connector.
> The signal at the L output is fairly sinusoidal (at least monotonic near the 
> crossing), but after the cap, it's like that ...

While I'm waiting for my own FE-5680A to arrive... that "sine" wave certainly 
looks awful. What kind of signal is coming from the Xilinx PLD pin, before the 
L?  Is it a simple 10 MHz square wave, or some kind of >> 10MHz PWM intended to 
approximate a 10 MHz sine wave?

If it is a 10 MHz square wave, can I use that as a 10 MHz clock directly 
(probably through a digital buffer) or does it have a lot of jitter, which the 
LC filter was supposed to smooth out?

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