tag:blogger.com,1999:blog-6245413346375218188.post2913295559543881653..comments2024-03-15T05:42:04.481-07:00Comments on Nerd Ralph: Testing 433Mhz RF antennas with RTL-SDRRalph Doncasterhttp://www.blogger.com/profile/00037504544742962130noreply@blogger.comBlogger4125tag:blogger.com,1999:blog-6245413346375218188.post-81660553141735939842016-01-14T13:35:49.218-08:002016-01-14T13:35:49.218-08:00The gauge and # of strands should make no differen...The gauge and # of strands should make no difference for a low-power 433Mhz device.<br />I have some receivers with the coil at the antenna base, and I have a few superhet receivers (no tuning required) that don't. Interesting question as to whether the coil impacts the antenna length. Maybe worth doing some more testing with different lengths (starting long and snipping off a few mm at a time).Ralph Doncasterhttps://www.blogger.com/profile/00037504544742962130noreply@blogger.comtag:blogger.com,1999:blog-6245413346375218188.post-81409225229403545872016-01-14T11:32:29.078-08:002016-01-14T11:32:29.078-08:00Ralph
Brilliant experiment. Thankyou for posting...Ralph<br /><br />Brilliant experiment. Thankyou for posting. <br />Do you think that the gauge and number of strands of the wire have much effect? <br />Did the board have an inductive coil at the base of the antenna, i.e. 3 turns of copper of 5mm diameter?<br />The length of this coil presumably should be taken into account.<br /><br />HopeRF has a helpful primer on RF antennas<br />http://www.hoperf.com/upload/rf/ANTENNAS_MODULE.pdf<br /><br />RobRob Wilkinsonhttps://www.blogger.com/profile/09463818052320197809noreply@blogger.comtag:blogger.com,1999:blog-6245413346375218188.post-80150370931352290162015-12-08T23:36:30.901-08:002015-12-08T23:36:30.901-08:00This comment has been removed by a blog administrator.Anonymoushttps://www.blogger.com/profile/04748293294555322958noreply@blogger.comtag:blogger.com,1999:blog-6245413346375218188.post-72353300500365539972014-07-22T04:10:27.595-07:002014-07-22T04:10:27.595-07:00Try to build a yagi:
http://boingboing.net/2003/06...Try to build a yagi:<br />http://boingboing.net/2003/06/07/floppy-disk-wifi-ant.htmlzoobabhttps://www.blogger.com/profile/16896135106354266238noreply@blogger.com