# Send zero-fill data when there's no input dato to process

**URL:** <https://www.ruby-forum.com/t/send-zero-fill-data-when-theres-no-input-dato-to-process/212430>\
**Category:** GNU Radio\
**Created:** [October 2, 2011, 7:00pm UTC](https://www.ruby-forum.com/t/send-zero-fill-data-when-theres-no-input-dato-to-process/212430 "2011-10-02T19:00:53Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![luislavena](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/0ea827/32.png) [@luislavena](https://www.ruby-forum.com/u/luislavena)\
**Post date:** [October 2, 2011, 7:00pm UTC](https://www.ruby-forum.com/t/send-zero-fill-data-when-theres-no-input-dato-to-process/212430/1 "2011-10-02T19:00:53Z")

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Hello,  
i have a message queue and some blocks that generate waveforms from the  
message input. The output of these blocks go to the USRP.  
I need a block that when there’s no data to process (0 message in queue)  
generates zero-filled samples, to keep USRP busy.  
I cannot find a similar block inside gnu radio sources. It’s possible?  
Thanks

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**Author:** ![Mattia\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/e68b1a/32.png) [@Mattia\_R](https://www.ruby-forum.com/u/Mattia_R)\
**Post date:** [October 2, 2011, 8:28pm UTC](https://www.ruby-forum.com/t/send-zero-fill-data-when-theres-no-input-dato-to-process/212430/2 "2011-10-02T20:28:34Z")

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> Discuss-gnuradio mailing list  
> [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid)  
> [Discuss-gnuradio Info Page](https://lists.gnu.org/mailman/listinfo/discuss-gnuradio)  
> Just put a multiplier in there that under normal circumstances is ‘1’,  
> and when you want to zero-stuff, set the multiplier to ‘0’.