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steve at steve-m.de steve at steve-m.deHi, On 2014-01-14 15:23, Jiao Xianjun wrote: > Is there any information or hint on the settling time after new > frequency set to dongle? That depends a bit on the tuner and the sample FIFO of the RTL2832, but you need to drop a few buffers, as the PLL of the tuner takes some time to lock and stabilize. > Can I immediately read samples after new frequency is set by > rtlsdr_set_center_freq? If so, will the samples quality be degraded? Kyle Keen did some experiments for his scanning application (rtl_power), and he settled for waiting a few milliseconds and flushing the buffer to get optimal results. See here: http://cgit.osmocom.org/rtl-sdr/tree/src/rtl_power.c#n626 Regards, Steve