I'm not very familiar with your application, but you may also have to do sub-sample time offset estimation and compensation. Even though all of the dongles are running at exactly the same sampling *rate*, their sampling * instants* will likely be different. This is despite the fact that you used the same length of cable to feed the clock to all the dongles. For example, if you want a 2.88MHz sampling rate, this will involve dividing the 28.8MHz input by a factor of 10. One dongle might use edge numbers 0, 10, 20, 30, ... of the source clock to produce the 2.88 MHz clock and another might used edge numbers 3, 13, 23, 33, .... Their sampling frequencies will be exactly the same, but the sampling instant will be different. I can confirm that you can do this since this is what I did in my LTE cell scanner to improve search speed. I configured the A/D rate once, and then I just kept changing the LO frequency. The thing is that once you change the LO frequency, the phase rotation of the received signal will change randomly for all the dongles. So, during the calibration phase, you might find that dongle 1 needs a time correction of t1 and phase correction of p1 to get its signal to align with the signal from dongle 2. After you change the LO, dongle 1 will still need the same time correction (t1), but you wont know what phase to use. Perhaps phase alignment isn't necessary for your application? BR, James -- *Integrity is a binary state - **either you have it or you don’t.* - John Doerr