SDR (Software Defined Radio)

We have a number of plutosdr devices at sysmocom, unfortunately all of them still RevB which unlike current RevD has no external clock input. Most of our use cases require a proper reference clock input, so I thought it might be a good idea to build a small board which contains the LTC6957HMS-3#PBF based input circuitry that was added in RevD. This circuit ensures that any square or sine clock can be used, at proper 50 Ohm impedance, over a wide range of levels.

The ext in / ext out ports should be SMA connectors, so that the resulting PCB can be panel-mounted by bulkhead-mounting those two SMA connectors to a face plate of whatever enclosure we're putting the plutosdr into.

The interconnect between the clock board and plutosdr can be made via u.fl as shown in https://coherent-receiver.com/wp-content/uploads/2018/01/umc-pluto-site.jpg

https://wiki.analog.com/university/tools/pluto/hacking/hardware