Re: [Discuss-gnuradio] Large Sample Spikes after Each Packet in tx_bursts Example

[Josh Blum]

On 06/18/2012 10:51 AM, Jason Tran wrote:
> Hi All,
> 
> "If you are seeing transients at the beginning of a burst, thats
> probablythe half band filters. They are implemented in block ram and
> dont clear between bursts."
> 
> I'm actually sending one burst of a very long length so I can emulate
> an always-on signal (i.e. I'm not letting tx_bursts actually send an
> EOB packet). However, I still get the large samples with suppressed
> samples around.  The number of samples between every large sample
> (363) is directly equal to the samples per buffer size. i.e. the size
> of buffs used when invoking tx_stream->send(buffs, samps_to_send, md,
> timeout);
> 

Sounds like you made some modifications to the example: Maybe you are
seeing the result of an underflow, or the buffer isnt filled for all
nsamps, or something during the checking for burst ack code...?

Perhaps the tx_waveforms example will be a better demonstration of
continuous streaming for you.

Also, this is the gnuradio mailing list, so I am going to recommend the
gnuradio companion as a great way to get started w/ the hardware and get
a good feeling for its operation:
http://gnuradio.org/redmine/projects/gnuradio/wiki/GNURadioCompanion

-josh