Re: [Discuss-gnuradio] gr-radar-mono TX at 64 MHz - and I/Q vector replace RF pulse

[Johnathan Corgan]

On Sat, May 1, 2010 at 05:13, sam <address@hidden> wrote:

> I want use USRP as Active Radar. In first time my aim is to emit a RF
> pulse at 64 MHz, and receive echo. For this i have read the comment in
> "gnuradio/gr-radar-mono/src/fpga/top/config.vh", the two last lines is:
>
> // Uncomment to enable 64 MHz Tx clock, otherwise 32 MHz
> //`define TX_RATE_MAX
>
> but if i uncomment the last line, the bitstream for fpga can be
> compiled, but the result is the RF-Pulse don't exist. It is a bug which
> be not reported? One people have use this without problem?

This functionality was never successfully debugged.  The DAC on the
USRP must be configured to allow being driven at 64 Msps, and if I
recall correctly, doesn't have the right clock pins in use to do so.

Johnathan