Thanks Matt I tried to change to get the external reference frequency to be 36 MHz, by setting B to 50 (i.e. 0x32) and R to 36 (i.e. 0x24). To do this, I modified lines 43 and 85 respectively to the following:
ad9510_write_reg(0x06, 0x32); ad9510_write_reg(0x0C, 0x24); However, when I rebuilt the firmware (txrx.bin) and wrote it to the SD card, I was no longer able to see an OFDM signal I had been transmitting from another SDR at 2.4 GHz. This occurred both when I had configured the receiving SDR to lock onto the 36 MHz reference (device->config_mimo(usrp2::MC_WE_LOCK_TO_SMA)) And when I configured the receiving SDR to use its internal reference (device->config_mimo(usrp2::MC_WE_DONT_LOCK)) Have I done something wrong in my modifications? If so, can you please suggest what I am doing wrong? According to the AD9510 datasheet I believe my changes should have been correct. Best Regards Ian. -----Original Message----- From: Matt Ettus [mailto:m...@ettus.com] Sent: Saturday, 14 August 2010 2:15 AM To: Ian Holland Cc: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Changing external reference frequency with USRP2... gnuradio/usrp2/firmware/lib/clocks.c, starting at line 40. You probably want to read the AD9510 datasheet to help with selecting values. Matt On 08/13/2010 12:34 AM, Ian Holland wrote: > Hi > > I have read on the FAQ that is possible to change the external reference > frequency for the USRP2 from 10 MHz to another value simply by changing > one line in the firmware. > > However, I have as yet been unable to locate the actual source file in > which I need to make this change, and what the name of this variable is. > Could someone please let me know? > > Many Thanks > > Ian. > > > ------------------------------------------------------------------------ > This message is intended only for the use of the intended recipient(s) > If you are not an intended recipient, you are hereby notified that any > use, dissemination, disclosure or copying of this communication is > strictly prohibited. If you have received this communication in error > please destroy all copies of this message and its attachments and notify > the sender immediately > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio This message is intended only for the use of the intended recipient(s) If you are not an intended recipient, you are hereby notified that any use, dissemination, disclosure or copying of this communication is strictly prohibited. If you have received this communication in error please destroy all copies of this message and its attachments and notify the sender immediately _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio