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--- radioamateur_et_wifi [2019/08/15 21:57]
julien
+++ radioamateur_et_wifi [2021/04/12 13:26]
julien
@@ Line 107: / Line 107: @@
 schéma récepteur Gyrator II VLF : http://www.qsl.net/SARA/graphics/vlfrx1_2.jpg
+http://www.transkommunikation.ch/dateien/schaltungen/diverse_schaltungen/radio_circuits/A%20simple%20LF%20receiver.pdf
-un trés simple VLF receiver : http://www.longwave.de/lfregen.html
 un réducteur de bruit en ville : http://www.radiosky.com/cancelit.html
@@ Line 279: / Line 278: @@
 more tuning radio/dab ans stuff - https://www.rtl-sdr.com/transmitting-fm-am-ssb-sstv-and-fsq-with-just-a-raspberry-pi/
+====== Geophone & seismographe ======
+part of ULF - https://ulf.ham.gr/proj4_en.php
+Seismic activities (antenna test) - http://www.vlf.it/seismicradio/seismicradio.htm
+Built a seismograph (not expensive) - http://www.infiltec.com/seismo/
+simple geophone - http://micromachine.stanford.edu/projects/geophones/GeophoneResearch.html#FIGURE1
+théorie/pratique géophone - https://www.scienceinschool.org/2012/issue23/earthquakes
+le bigAss géophone diy - https://medium.com/@seistech05/telling-the-future-with-science-the-geophone-b84b63f1f08

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