Re: [Discuss-gnuradio] Bypassing the interpolation

[Jeffrey Lambert]

Hello,

I am working on a similar project to use a USRP 1 as a RADAR device for 
a temperature measurement application.  I am not sure about the USRP2, 
but for USRP1 it is possible to send a signal from the FPGA to the DACs 
without interpolation through manipulation of the FPGA registers and by 
using custom verilog code.  The most relevant example would be 
usrp_radar_mono.  I am not sure if there is similar code for the USRP2.

~Jeff

On 8/2/2010 10:59 AM, Cheaw Wen Guey wrote:
> Hi,
>
> I think I may not be the first to ask this but here is my problem.
>
> I am designing a radar receiver using a USRP2. My transmits and receives
> are done in pulses. The problem is that I require 80MHz bandwidth and the
> USRP2 can only reach 25MHz. I understand that this is due to to the
> limitation of the GB ethernet. I would like to bypass the DDC and then
> make it not real time to allow the data to be transmitted as I do not
> require the system to be realtime.
>
> My questions are:
>
> 1) Where should I be looking, in the VHDL or the USRP2 firmware to modify
> to allow full bypass?
>
> and
>
> 2) I am still trying to understand how to receive on time. Any examples to
> refer to?
>
>
> Cheaw Wen Guey
> Research Officer
>
> --
~Jeffrey Lambert, K1VZX

--
~Jeffrey Lambert, K1VZX