Re: [Discuss-gnuradio] USRP2-FLEX2400 Transmit and Receive problems

[Marcus D. Leech]

On 09/01/2010 12:51 PM, Jason Abele wrote:
> > I'll need to do some re-soldering and burn-db-eeprom with USRP1 and hopefully 
> > this
> > should fix the problem:
> > http://gnuradio.org/redmine/wiki/1/USRPClockingNotes
> >      
> Also, since you use UHD, you can change the daughterboard ID of a
> daughterboard on a USRP2 from your host PC using:
>
> <prefix>/share/uhd/utils/uhd_burn_db_eeprom
>
> An example of changing the DBID for a DBSRX is show here:
> http://www.ettus.com/uhd_docs/manual/html/dboards.html#id1
>
>
> Jason
>
>
>    
So, Jason, is this because the older FLEX-series boards used an on-board 
clock that is
  *different* than the one supplied by the USRP2, and the driver code 
(either Classic or
  UHD) assumes a different clock rate than the one that was previously 
on-board, and thus
  is mis-programming the PLL?

If the two clocks are the same frequency, then I don't understand why 
changing from
  "clock supplied on-board" to "clock supplied by USRP2" would "fix" 
the problem.
  Inquiring minds want to know...



--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org