[Discuss-gnuradio] RFX400 Tuning & WBX Comparison

[Andrew Gilbett]

Hi,

When I ask my RFX400 to tune a frequency for example 438.600MHz I get
the following output.

A: Flex 400 Tx MIMO B
       r.baseband_frequency = 442000000.0
       r.dxc_frequency = -3400000.0
       r.residual_frequency = -0.381469726562
       r.inverted = False

This means that the synthesiser tunes to 442MHz and in the FPGA the
base band signal is frequency translated to -3.4MHz? Thus the output
is on frequency at 438.600MHz.
Have I spelled that out correctly? I am just trying to get a picture
of how the system works to tune all the frequencies that I may throw
at it.

Also questions about the WBX:
How come the RFX400 is now depreciated in favour of the WBX but the
rest of the RFX series are not and seem to be covered by the WBX
frequency range?
The connector J101 pictured on the WBX on the image available on the
ettus website; is that so that a SMA connector can be directly
attached to the receiver? Thus eliminating problems relating to cross
talk in the little rf switches on the grand-daughter board.

Thanks :-)
Andrew Gilbett
address@hidden