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Re: [Discuss-gnuradio] UHD Source Block and N210/SBX Synchronisation

From: Nigel Steed
Subject: Re: [Discuss-gnuradio] UHD Source Block and N210/SBX Synchronisation
Date: Wed, 2 Mar 2016 13:41:20 +0000

Hi Marcus,


I have now tried exactly that and it works. Thanks. One thing I am trying now is to implement the command times over the message ports but if you say time commands are not supported in gr-uhd I maybe stuck. I see the functions are in a ifdef.






From: discuss-gnuradio-bounces+address@hidden [mailto:discuss-gnuradio-bounces+address@hidden On Behalf Of Marcus D. Leech
Sent: 02 March 2016 02:08
To: address@hidden
Subject: Re: [Discuss-gnuradio] UHD Source Block and N210/SBX Synchronisation


On 03/01/2016 10:43 AM, Marcus D. Leech wrote:

The only thing really missing in gr-uhd is the ability to do timed commands.   You can force integer-N mode by constructing your own
  tune_request that includes the integer-N option.  You'd use a feature from the latest Gnu Radio to help you with this, because it involves
  getting into the internal structure of a tune_request blob.   So, use the "Python module" block, and in that Python do something like:

def integer_N_tune_me(freq):
    r = uhd.tune_request(freq)
    r.args = {"mode_n" : "integer"}
    return r

Then, in your UHD source/sink block, instead of using your target frequency directly, use:


Martin could probably comment on the feasibility of adding timed commands to gr-uhd.

What I actually meant wasn't that gr-uhd doesn't have timed-command support, but rather, the GRC scaffolding for this doesn't really
  exist.  If you write your own Python, you can of course use timed-commands with gr-uhd, and in fact if you're willing to edit the
  output of GRC (generated Python) you can wire-in timed-commands fairly easily, it's just that there's no way to set this up with
  the existing UHD blocks for GRC (yet).

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