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External Clock input on original LimeSDR

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Hi,

Im wanting to feed the limeSDR-usb (the original limesdr, not the mini) a external clock reference from a leo Bodnar gpso (Mini Precision GPS Reference Clock : Leo Bodnar Electronics)

After looking at various threads on here im confused as alot of them are focused on the limeSDR mini and im not sure how that differs vs the limeSDR-USB in this regard (if it does at all)

questions are:
what frequency should the external reference clock be on?
Does the original limeSDR need any HW modification to take an external clock reference?
Can I also use clk output port to output this reference on a separate configurable frequency? (to feed an LNB PLL on 24Mhz)
Optionally, If i used a gpso with dual reference outputs instead, could i feed the limesdr a reference on 24Mhz (and use the second gpso reference output to also feed the LNA PLL @ 24Mhz too)

many thanks

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