[Discuss-gnuradio] Acceptable sampling rate and LO frequency for USRP LFRX
Hi, I have been using GRC and N210 to test my data acquisition scheme. My previous scheme worked well with probably standard sampling rate (10Msps) and LO at DC. When I switched to a non-standard sampling rate (1.2 Msps) and non-standard LO (1.105 MHz), all hell seems to break loose. One message appears to be helpful, says: Hardware does not support requested sampling rate, request 1.200.. Msps, actual 1.2048. Msps. I suspect my requested LO of 1.105 MHz also may not be met, but there is no message saying that. My question is: how do my find out the LFRX supported sampling rate and LO frequency? Thanks, LD ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Acceptable sampling rate and LO frequency for USRP LFRX
On 07/29/2013 02:47 PM, LD Zhang wrote: Hi, I have been using GRC and N210 to test my data acquisition scheme. My previous scheme worked well with probably standard sampling rate (10Msps) and LO at DC. When I switched to a non-standard sampling rate (1.2 Msps) and non-standard LO (1.105 MHz), all hell seems to break loose. One message appears to be helpful, says: Hardware does not support requested sampling rate, request 1.200.. Msps, actual 1.2048... Msps. I suspect my requested LO of 1.105 MHz also may not be met, but there is no message saying that. My question is: how do my find out the LFRX supported sampling rate and LO frequency? Thanks, LD The daughtercards don't know anything about sample rate. The available sample rates are determined by the motherboard hardware. In the case of the N210, the selected sample rate must be a proper integer fraction of the fixed ADC sample rate, which is 100Msps. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Acceptable sampling rate and LO frequency for USRP LFRX
Thanks. Does the LO frequency also have to integer fraction of 100 MHz? From: discuss-gnuradio-bounces+ldz10565=gmail@gnu.org [mailto:discuss-gnuradio-bounces+ldz10565=gmail@gnu.org] On Behalf Of Marcus D. Leech Sent: Monday, July 29, 2013 11:52 AM To: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Acceptable sampling rate and LO frequency for USRP LFRX On 07/29/2013 02:47 PM, LD Zhang wrote: Hi, I have been using GRC and N210 to test my data acquisition scheme. My previous scheme worked well with probably standard sampling rate (10Msps) and LO at DC. When I switched to a non-standard sampling rate (1.2 Msps) and non-standard LO (1.105 MHz), all hell seems to break loose. One message appears to be helpful, says: Hardware does not support requested sampling rate, request 1.200.. Msps, actual 1.2048. Msps. I suspect my requested LO of 1.105 MHz also may not be met, but there is no message saying that. My question is: how do my find out the LFRX supported sampling rate and LO frequency? Thanks, LD The daughtercards don't know anything about sample rate. The available sample rates are determined by the motherboard hardware. In the case of the N210, the selected sample rate must be a proper integer fraction of the fixed ADC sample rate, which is 100Msps. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
