[Discuss-gnuradio] Sample receive time in benchmark

[Harry Zhang]

Hi,
My last question
(http://lists.gnu.org/archive/html/discuss-gnuradio/2013-09/msg00196.html)
seems no answer.But I get another question.
I wanna know the actual receive time of a sample. If I get the rx
tag(sample count 100), I can calculate the any sample's receive time.
For example,sample 1600's receive time: (1600-100)*sample_rate.
Is it correct?
In my last question, the sender transmit data every 3 second and the
uhd_fft shows it's true.But the above formula give the result about 1
second.
I think the sample_rate is wrong. I'm using benchmark_rx(gmsk) in
narrowband and the UHD shows the sample_rate is 200ksample/s.
Sample_rate wrong or my formula,which is wrong?
Any suggestion is appreciated.