I am trying to understand what modification is needed in order to transmit and receive with the second paths: Tx2/Rx2.
I have looked for the changes need to be done at the registers on “AD9361_Register_Map_v2.8C” and found 3 or 4 possible setting for this to be supported:
xx= 5E for Tx/Rx1
xx= 9E for Tx/Rx2
xx= DE for Tx/Rx1&2
I have done the changes (9E) but it seems not to work.(No output signal was noticed)
When changing 002 and 003 to DE I got CW with low power at my TX1 and TX2 port
This made me realized that I might have missed something so I looked for a change of the IQ samples order….
SPI Register 0x010—Parallel Port Configuration 1
[D7] PP Tx Swap IQ Clearing this bit swaps the positions of I and Q (performs a spectral inversion).
[D6] PP Rx Swap IQ Same as bit D7 but for the Rx path.
[D5] Tx Channel Swap Setting this bit swaps the positions of Tx1 and Tx2 samples.
[D4] Rx Channel Swap Same as bit D5 but for the Rx pat
So I changed RegAdd 0x10 from 0xCC to 0xFC
Then it worked – (I can notice the correct mask and EVM on my test equipment from Tx2) but still noticed a low level CW(same frequency) on TX1
But now- my RX2 doesn’t seem to work…it reports a signal levels up to -35dBm only…
Some point outs:
I am facing those issues on my design and not the EBZ/FCOMM
on our design SISO mode on Tx/Rx1 is working
Can you please suggest/point out how I can achieve to transmit/receive on Tx/Rx2?