Hi Barry and Bill, > I don't know how wide a spectrum the PLL can handle.
Generally, that's not really inherently limited by anything but the loop bandwidth. It's a really simple PLL, with a complex sample-argument phase detector. In other words: if you set the loop bandwidth too high, the PLL will jump around like crazy in the presence of noise, or might lock onto data instead of carrier. Pick a bandwidth too small, and it won't be able to ever lock to even the cleanest carrier if it's further away. It also won't be able to "follow" a changing carrier frequency (might be pretty relevant for satcom, if it's not geosync. Best regards, Marcus
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