RE: Proper use of stream, on a re-occuring event

[address@hidden]

Thanks for the reply, I’ll join the USRP-users mailing list.

 

From: Marcus D Leech <address@hidden>
Sent: Tuesday, May 19, 2020 12:36 PM
To: Begaye, Alvin A <address@hidden>
Cc: address@hidden
Subject: Re: Proper use of stream, on a re-occuring event

 

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 Your approach isn’t horrible. I’d stick with it. 

 

Give that the USRP is sampling at a rate much faster than the transition event you’re describing, I’m wondering if perhaps you don’t really understand how a high-speed sampled baseband signal “works”. Your “can the USRP handle this” comment suggests confusion. 

 

Also as a matter of housekeeping your question is more properly directed to the USRP-users mailing list, not discuss-gnuradio. 

 

 

Sent from my iPhone

On May 19, 2020, at 1:03 PM, "address@hidden" <address@hidden> wrote:



I need to be able to grab a couple of samples at  after some time after a recurring event (step 2e below).   The current method seems to work at the moment, but was wondering if there was a better way.  I tried to read the documentation and example of proper use for this scenario, but I still don’t understand L

 

Also,   the time we need to read the samples is less than a millisecond,   can the USRP handle a transition of  a signal that dropped 20dB that fast?  How long would we have to wait after the power drop?

 

Current method:

1.       stream_cmd.stream_now = true

 

2.       while FOREVER

 

a.       Wait for re-occurring Event

 

b.       Wait for X amount of time

 

c.       stream_cmd.stream_mode = UHD_STREAM_MODE_START_CONTINUOUS;

d.       uhd_rx_streamer_issue_stream_cmd(rx_streamer, &stream_cmd)

 

e.       uhd_rx_streamer_recv(....)

 

f.        stream_cmd.stream_mode = UHD_STREAM_MODE_STOP_CONTINUOUS;

g.       uhd_rx_streamer_issue_stream_cmd(rx_streamer, &stream_cmd);

 

h.       Process Samples

 

  endwhile