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| From: | Brian Padalino |
| Subject: | Re: [Discuss-gnuradio] Frequency error in USRP. |
| Date: | Tue, 10 Apr 2007 17:40:19 -0400 |
On 4/10/07, Tarun Tiwari <address@hidden> wrote:
Hi Matt, Eric, and my dear friends, I received third set of USRP for my research work, but the third USRP is not able to lock/demodulate the desired frequency. When i transmit a signal on 2.4GHz from one of the old USRPs I need to lock the new USRP at 2.39989 GHz else it does not demodulate the signal.
The 64MHz oscillator on the board has a maximum 50PPM error. This gives an error of up to 3200Hz. To get to 2.4GHz, that's 37.5x the 64MHz local oscillator. 3200Hz * 37.5 = 120kHz. 2.4e9 - 120e3 = 2.399880e9 So it is pretty possible that your oscillators are just that far off? Brian
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