Hi,
According to the manual, USRP Source generates tags whenever settings change
(e.g. center frequency). I would like to use this for my frequency hopping
system: A python code regularly changes the center frequency of the USRP Source
(and Sink) block and then I use "rx_freq" tags to detect whenever a switch
happened and patch together a packet.
I need to convert the sequential data due to hopping to a "parallel" data: For
example, I hop between three frequencies than after the last frequency, I need
to process the data for all three frequencies. Hence I need to know when the
different switch occured.
However, using the "Tag Debug" block I see that for each tune request 6 tags
are created. For example:
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 14537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 14537796 Source: file_meta_source0 Key: rx_time Value:
{1576453289 0.0988063}
Offset: 14537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 15537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 15537796 Source: file_meta_source0 Key: rx_time Value:
{1576453289 0.298806}
Offset: 15537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 16537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 16537796 Source: file_meta_source0 Key: rx_time Value:
{1576453289 0.498806}
Offset: 16537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 17537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 17537796 Source: file_meta_source0 Key: rx_time Value:
{1576453289 0.698806}
Offset: 17537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 18537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 18537796 Source: file_meta_source0 Key: rx_time Value:
{1576453289 0.898806}
Offset: 18537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
----------------------------------------------------------------------
Tag Debug:
Input Stream: 00
Offset: 19537796 Source: file_meta_source0 Key: rx_freq Value: 1.85e+09
Offset: 19537796 Source: file_meta_source0 Key: rx_time Value:
{1576453290 0.0988063}
Offset: 19537796 Source: file_meta_source0 Key: rx_rate Value: 5e+06
----------------------------------------------------------------------
I expected only one. Why are there six of them?
Thanks,
Luke
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