[USRP-users] SBX daughtercard bandwidth problem..!!

Josh Blum josh at ettus.com
Sun Feb 12 01:58:44 EST 2012


> 1. Am i write in this conclusion??

Correct.

However, it is possible to increase sample rate at the expense of
dynamic range. On the UHD master, you can receive 50Msps with 16 bit
samples. This feature is not yet a part of the SDRu driver.

> 2. If yes, than why it is written in application notes tat it has BW of 40
> MHz??

This is an analog bandwidth filter. You cannot receive signals outside
LO +/- 20Mhz due to the filter. Consider that some may tune the LO away
from the center frequency for various reasons.

> 4. Why i am not able to set decimation or interpolation to 1.??

The bandwidth bottleneck is the gigabit ethernet port. Given the recent
advent of 16 bit samples, a decimation of 2 is really the minimum.

This is a user mod to burst 100Msps packets, which you may find helpful:
https://lists.gnu.org/archive/html/discuss-gnuradio/2011-03/msg00303.html

-Josh




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