The device consist of AD9363 and Zync FPGA - both can receive external GPS clock.
Can several ADALM-PLUTO SDRs be synchronized with GPS clock?
You could use an external clock (controlled by GPS) to drive the AD9363 inside Pluto yes. It will require removing a capacitor and using the now empty pad to connect your clock in. You can read more about using external references in the UG-570 doc for the chip.
Thank you Travis.
According to AD9361 Reference Manual, there are indeed two separate EXT LO inputs, one for Rx and the other for Tx.
However, I wonder if this may fit a TDOA application.
In case of USRP B210 for instance, in order to enable time synchronization(for TDOA applications), the receiver nodes additionally need a GPS disciplined oscillator (GPSDO) that provides a clock signal for the front-end and a pulse per second (PPS) synchronization signal. Several devices can be used for this purpose, such as - LCXO manufactured by Jackson Labs Technologies and the u-blox LEA-M8F. Both can be pluged into the USRP B210 RF front-end. By default the USRP B210 is designed to receive a LCXO GPSDO, in order to mount the LEA-M8F a PCB specifically designed for that purpose is to be used.
Wondered what would be the equivalent setup(if exists) in the case of Adalm-Pluto.
Many thanks in Advance.
There is a bunch of additional circuitry on the B210 to make the GPSDO possible to get both 10MHz and the 1PPS to correctly synchronize boards. If you look at the B200-mini you can only drive it with a 10MHz clk externally, which is basically the easiest thing to do with Pluto. This requires some soldering though as I mentioned before.
Seems that the platform is currently out of stock.
Any ideas where used one can be purchased?
They have been out of stock for awhile due to memory shortages. There is a backlog of orders but more are coming in soon.
What are the required modifications to the board of Adalm Pluto needed to enable the second RX Channel?
While the AD9362 features 2Rx2Tx only one pair is routed.
You would need to attach to a soldered down BGA, which is not feasible.
Thank you Michael.
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