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Leif Asbrink leif at sm5bsz.comOn Thu, 2 Jan 2014 20:09:56 +0800 Jiao Xianjun <putaoshu at gmail.com> wrote: > Because we always want the rtl-sdr work in the band we are interested, but > unfortunatelly in that band there maybe no any pre-known reference signal > for us to do synchronization. So a possible solution maybe make a beacon, > which can generate ultra-narrow-band or ultra-low-power signal in the > target band to help us do the on-line calibration. Any better ideas to > avoid this dedicate beacon? To add a beacon is a very good idea. It can be placed near the band edge where S/N is not so good due to aliasing so it would not disturb signals of interest. By having very good frequency accuracy on the beacon one can synchronize all the dongles to get very high stability and accuracy:-) - leif -