What's the settling time after new frequency set to dongle?

[steve at steve-m.de]

Hi,

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