Hello All, I have a USRP x300 and I want to build my custom image. I would like to drive an array of 4 Tx/Rx antennas in the HF band for ionospheric research, i.e beam steering monostatic pulse radar.
This is my idea for a custom built: Since I will use 4 daughterboards 2 LFTX and 2 LFRX mounted on the X300. Each LFTX or LFRX have 2 port that can be used independently or as a single I/Q input. I will use it independently. Then, I will have available 4 Rx ports and 4 Tx ports. The Radio connections would be the following: For the receiver chain: Radio 0 port 0, Radio 0 port 1, Radio 0 port 2 and Radio 0 port 3 would be connected to an adder, the output of the adder to a DDC chain, and the output of the DDC chain to a streamer. In that way all 4 Rx signal would be summed before passing through the DDC chain and I would save space in FPGA. For the transmitter chain the only difference is that I would connect the output of the DUC to a delay line filter and from there extract the 4 outputs to the 4 Tx ports available on the daughterboards. This delay line should be configurable since from there I would change the steering of the beam. Also I would like to use only one 1Gb Ethernet and not both, so I could save FPGA space. In summary this would be the rfnoc blocks: 2 Radio interfaces, 1 DDC, 1DUC, 1 custom delay line block, and only 1Gb interface. I think this may occupy less space than the default image. One of the many doubts that I have is about the radio interfaces, in the default image these radio interfaces have only 2 port, for example Radio 0:0 and Radio 0:1, but I would need also Radio 0:2 and Radio 0:3. The same for Radio 1: 0 to 3. Because I will use all the ports availables in the doughterboards. I know this is a general and tricky question and I apologize in advance. But any any help would be very appreciated. Best, German
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