Re: [Discuss-gnuradio] Run USRP at alternate clock frequency?

[Matt Ettus]

Clark Pope wrote:
> 
> I would like to run my USRP off a 44 MHz clock instead of the 64 MHz
> clock that is currently used. A couple reasons:
> 1. the 64MHz rate exceeds the USB bandwidth even with byte-wide samples
> (64*8 = 512 mbps)
> 2. 44 MHz works much better for the wlan signals I'm after
> 
> So the questions are:
> 1. can I generate a 44Mhz clock from the 64 MHz or do I have to change
> the crystal?

You need a new crystal or an external oscillator.

> 2. If I change over to 44 MHz will everything else still work?
> Especially the dbs and flex2400 boards?

You will need to change the 64e6 in line 108 of the db_dbs_rx.py file in
gr-usrp to give the correct reference frequency.  Everything else will
work fine.


Matt