As an update, I was able to feed directly 10MHz into my Rev. C/D Pluto. I used a 0.9Vpp square signal from a ENE3311B. Had to run, as per https://wiki.analog.com/university/tools/pluto/devs/booting:
fw_setenv refclk_source 'external'
fw_setenv ad936x_ext_refclk_override '<10000000>'
pluto_reboot resetThis way, 10MHz was enabled from the external input.
Hello,
I'm currently building a GPSDO with a 10MHz output and have a Rev. D ADALM-Pluto.
My question is if there is any advantage in multiplying the 10MHz reference to 40MHz (either through PLL or harmonic multiplier) vs feeding the 10MHz directly and adjusting the frequency in software?
I ask this as there is some info about phase noise performance being better when feeding with 40MHz reference, however I'm not sure if the extra phase noise caused by multiplication wouldn't be greater than Pluto's added noise.
73,
PY3PK
HG0NCL I'm also looking at this, but they seem not to be in stock either in Digikey or Mouser. However, I found a supplier that claims to have them in stock in China. I'll talk to him and maybe buy some samples for cheap https://www.alibaba.com/produc…llator_1600201492795.html