Hi
I am not familiar with those solutions. Could you please give a little more
detail?
How can I use msg ports/ stream tags? Are they available in python
flow-graph or do I have to look into C++ block programming?
Where can I see rx_time, rx_rate and rx_freq tags ?
Regards,
Jorge
On 5 February 2015 at 11:57, sreeraj r wrote:
>
> On Thu, Feb 5, 2015 at 11:30 AM, Jorge Gallo wrote:
>
>> Hi,
>>
>> I have a python flowgraph with several blocks.
>>
>> One of them is a "filter.single_pole_iir_filter_ff" which does a moving
>> average. The last block is a Sink to file block.
>>
>> I scan several bands, 10MHz each, in order to get the power of the
>> signals in those bands. I use moving average to get an average of 5
>> readings in each band.
>>
>> In order to change the center frequency, I stop the flow-grahp,
>> reconfigure the USRP center freq and then start the flow-graph again.
>>
>
> You can use the message port[1] in uhd source/sink or stream tags [2] to
> change the center frequency
>
>
>>
>> I guess samples from the previous scans remain in internal block buffers
>> since I get power in samples of BAND2 (BAND1+10MHz) which are only present
>> in BAND1. That is, the moving average is effective between bands and I only
>> want to be effective in the same band.
>>
>> I thought that stop() and start() signals would reset the entire graph
>> but I am afraid it doesn't.
>>
>> Is there a way to flush those samples so that everytime I run the
>> frequency changed flow-graph I don't get the samples from the previous band?
>>
>
> UHD source will give rx_time, rx_rate and rx_freq tags whenever there is a
> tune request to a new frequency. You can use these tags to get rid of
> unwanted samples.
>
>
>>
>> Many thanks in advance.
>> Jorge
>>
>
> [1] http://gnuradio.org/doc/doxygen/page_uhd.html
> [2]
> https://github.com/gnuradio/gnuradio/blob/master/gr-uhd/examples/python/freq_hopping.py
>
>
>>
>>
>>
>>
>>
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>>
>
>
> --
> Regards
> Sreeraj Rajendran
> http://radioninja.in/
>
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