# WWVB monitoring with GNU radio

**URL:** <https://www.ruby-forum.com/t/wwvb-monitoring-with-gnu-radio/239827>\
**Category:** GNU Radio\
**Created:** [March 16, 2014, 3:40am UTC](https://www.ruby-forum.com/t/wwvb-monitoring-with-gnu-radio/239827 "2014-03-16T03:40:39Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\
**Post date:** [March 16, 2014, 3:40am UTC](https://www.ruby-forum.com/t/wwvb-monitoring-with-gnu-radio/239827/1 "2014-03-16T03:40:39Z")

</div>

Here is an (almost) week long plot of WWVB signal strength taken with GR  
and N210 + LFRX + 500 kHz LPF + 100 foot wire. 25 Msps decimated down  
to 100 sps, then RMS to 1 sps. Very strong -60 dBm signal here 500  
miles from the TX, yet deep fades which are consistent after sunrise.  
Surprisingly consistent reception during the day time.

Plot:  
[https://dl.dropboxusercontent.com/u/49570443/wwvb\_rx.png](https://dl.dropboxusercontent.com/u/49570443/wwvb_rx.png)

GRC file:  
[https://dl.dropboxusercontent.com/u/49570443/wwvb.grc](https://dl.dropboxusercontent.com/u/49570443/wwvb.grc)

GRC image:  
[https://dl.dropboxusercontent.com/u/49570443/wwvb.grc.png](https://dl.dropboxusercontent.com/u/49570443/wwvb.grc.png)

Post processing:  
[https://dl.dropboxusercontent.com/u/49570443/wwvb2.py](https://dl.dropboxusercontent.com/u/49570443/wwvb2.py)