I am wondering why there are two switches in the RFX series daughter
schematics. It seems their purposes is different: one for switch between
and Rx, another switch between Rx and Rx2. So, my questions as:
- we may use one tx and rx enough, why need to use two Rx?
2.I follow the python code into usrp.pick_rx_subdevice(u) and the return
value is side and subdev. Since there are two rx there, how may I know
subdev refer to rx or rx2?
- if we call set_auto_tr(), it refer to which switch?
I also test usrp_fft.py and find both Tx/Rx and Rx2 have signal input
using the same usrp_siggen.py), while input from Tx/Rx is stronger than
Since Tx/Rx is followed by a filter, it should be less than Rx2, so,
I use two sets of USRP with RFX900 to test a FDD( frequency devision
by cable connection. According to my experience, the cable loss should
less than 0.5-1 db, right? (which come with RFX900) So, If I set the
gain for two RFX900 tx, say -a 100, the received signal is much smaller
the coupled signal from itself, whatever the different frenquency is.
why there are both input signal? it is coupled signal or intentionally
designed? I think it is intentional designed, and since the tx signal is
routed to Rx2 directly, so it is much stronger than come from its peer
is it right?
Thanks for your reply!