Re: [Discuss-gnuradio] how to trigger dynamic reconfiguration with lock/disconnect

[Josh Blum]

On 06/04/2011 09:35 AM, Marcus D. Leech wrote:
>>
>>   
>>
>> Yea, you cannot send samples when you dont want to transmit. There isnt
>> really such a concept of that in GRC itself, but you certainly can
>> implement the blocks and control logic and connect them in grc. Someone
>> should make interesting use of those tagging features as well. :-)
>>
>> -Josh
>> \
> So, a "hack" that could be put into UHD (or perhaps gr-uhd) is that if
> we've sent N
>   consecutive blocks of zeros, we cancel the "burst", and resume only
> when we see
>   non-zeros.  This is conceptually similar to the way analog T/R relays
> that rely on
>   power-sensing work.
> 
> But yes, a cleaner mechanism would be if one could insert a "don't
> transmit this, I'm just keeping
>   the stream alive" tag in the TX datastream.
> 
> 
> 

You could make a block to do this, a kind of shutoff block that forwards
the stream until it sees too many zeros. It could also generate an end
of burst stream tag do the uhd sink could properly end the burst.

-josh