Re: [Discuss-gnuradio] TVRX data interface to USRP board (VINN_A, VINP_A; VINN_B, VINP_B)

[Matt Ettus]

address@hidden wrote:
> Hi, all
>          This may be a simple question but I can not find any definite answer
> from the archive.
>          In the module interface, there are two RF data differential pairs 
> from
> RF board to the USRP board: VINN_A, VINP_A; VINN_B, VINP_B. 
> If there are two individual RF tuners on the RX board, I think they each use 
> one different pair, like the picture below for basic RX board.
> http://www-personal.engin.umich.edu/~anastas/gnuradio/usrp_gen.eps
> But how about the TVRX board? From what I see from the python code,
> only one ADC is used. Is one of the differential pairs left open
> or both of them connect from the same RF tuner output? If the answer is 2),
> under what condition would this be used (I/Q sampling) for this tuner?

The second input on the TVRX is unused and unconnected.  There wasn't
any room left on the board to make use of it, because the MT4937 is so big.

Matt