# Getting time each time power squelch is on **URL:** \ **Category:** GNU Radio\ **Created:** [January 2, 2015, 11:47pm UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676 "2015-01-02T23:47:35Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![addis\_a](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/c4cdca/32.png) [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Post date:** [January 2, 2015, 11:47pm UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/1 "2015-01-02T23:47:35Z")
Hello, I have a Python handcoded block in which I want every time that power squelch is triggered, grab the actual time and then use that filename to write a wav file with a decoded stream. What would be a good approach? I tried using variables but I see they don’t update at runtime and I am not sure if you are able to change the wav sink name on runtime and just expect it to work or if it neccesary to do something else there. Thanks. ---
**Author:** ![luis21\_futur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/87869e/32.png) [@luis21\_futur](https://www.ruby-forum.com/u/luis21_futur)\ **Post date:** [January 3, 2015, 12:13am UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/2 "2015-01-03T00:13:36Z")
Hi Luis, I am pretty certain there is a block in mainline GR to do this with tagging. Burst tagger maybe? The tags define the burst boundaries and a timestamp is recorded as well. ---
**Author:** ![luis21\_futur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/87869e/32.png) [@luis21\_futur](https://www.ruby-forum.com/u/luis21_futur)\ **Post date:** [January 3, 2015, 8:40pm UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/3 "2015-01-03T20:40:52Z")
Hi Dan, Thanks for the response, but it seems like burst tagger would not work in this case because I am working with audio. What I want is when power squelch is triggered demod a NFM signal and then save it to a wav file with the time power squelch was triggered. Thanks 2015-01-02 16:12 GMT-07:00 Dan CaJacob [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![luis21\_futur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/87869e/32.png) [@luis21\_futur](https://www.ruby-forum.com/u/luis21_futur)\ **Post date:** [January 4, 2015, 12:44pm UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/4 "2015-01-04T12:44:53Z")
On Sat, Jan 3, 2015 at 8:39 PM, Luis C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Hi Dan, > > Thanks for the response, but it seems like burst tagger would not work > in this case because I am working with audio. What I want is when > power squelch is triggered demod a NFM signal and then save it to a > wav file with the time power squelch was triggered. You can try keeping power squelch’s gate to false (so that you will get zero samples) and then use it as a trigger for “burst\_tagger” after doing some math manipulations. This along with a “tagged\_file\_sink” should work. Please look into “gnuradio/examples/tags” for examples. Sreeraj ---
**Author:** ![luis21\_futur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/87869e/32.png) [@luis21\_futur](https://www.ruby-forum.com/u/luis21_futur)\ **Post date:** [January 5, 2015, 12:04am UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/5 "2015-01-05T00:04:48Z")
Hello sreeraj, I am checking those examples, thanks. Can you elaborate with what you mean with math manipulations?? Even if I am using tagged\_file\_sink can I interpret what is generated as if they were audio wav files? Thank you. 2015-01-04 4:43 GMT-07:00 sreeraj r [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid): ---
**Author:** ![luis21\_futur](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/l/87869e/32.png) [@luis21\_futur](https://www.ruby-forum.com/u/luis21_futur)\ **Post date:** [January 5, 2015, 2:29am UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676/6 "2015-01-05T02:29:57Z")
Hi, sreeraj, I figured out what you meant by the math manipulations. Thanks I based on the example of the uhd energy detector.py for modifying the output of the power squelch to use it as a trigger on burst tagger. I see that if I put on audacity 32bit float it’s going to interpret the file created by the tagged file sink right. Thanks all of you 🙂 2015-01-04 16:03 GMT-07:00 Luis C. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid):