Re: [Discuss-gnuradio] Help on gnuradio

[Julian Arnold]

Hey,

I had the same problem a few weeks back in a two channel scenario.
I ended up writing a simple python 'gate' block that passes a 
configurable amount of samples for every pulse on the trigger input.

It is super inflexible and hacky but should be fairly easy to modify.

I quickly moved the block to it's own OOT module. You can find it here:
https://github.com/jarn0ld/gr-gate

Let me know if you need any help modifying it.

Cheers,
Julian

On 20.06.2018 20:02, Marcus D. Leech wrote:
> On 06/20/2018 01:05 PM, address@hidden wrote:
> > Hi, I am new to the gnuradio environment..so please forgive me... I 
> > have an USRP B200 and I am looking to save to a file I & Q samples of 
> > bursty, random (ALOHA) messages sampled at high rate, for furter 
> > processing (in a repeatable fashion). Of course it is not possible to 
> > save 15--20 mminutes of data at 50MSPS, but using something like a 
> > "valve" (deprecated in GRC) it vould be possible:
> > 1) to detect in real time the burst data transmission
> > 2) to open the valve towards a file sink
> > A separate file could be used to record timestamp and/or length of 
> > data blocks recorded
> >
> > Looking at  GRC I haven't found any useable block to build a valve 
> > used at run time based on a threshold (e.g. output of a filter to 
> > detect the TX random signal) . Could anybody help?
> > Thanks a lot
> Here's a "trick".
>
> Have your threshold detector switch the output of the file sink between 
> /dev/null and an actual file.
>
> There's also power squelch, which can either insert zeros, or act as a 
> "gate".
>
>
>
>
>
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