tag:blogger.com,1999:blog-9071048343455395511.post2148976637792197392..comments2024-03-24T22:03:31.205+00:00Comments on Roger G3XBM's (Mainly) Amateur Radio Blog: Good results with new VLF earth-mode RX systemRoger G3XBMhttp://www.blogger.com/profile/13673890140751539870noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-9071048343455395511.post-15317449192200448802013-06-08T13:36:03.034+01:002013-06-08T13:36:03.034+01:00TX: TDA2003 audio IC (5W).
TX antenna: 20m spaced...TX: TDA2003 audio IC (5W). <br />TX antenna: 20m spaced earth electrodes (1 rod at bottom of garden, second is connection to house copper pipes. TX matched to earth electrodes with 3C90 toroid transformer. <br />RX loop: 30t wire on 80cm sided square loop. Wire about 1.2mm diam PVC insulated. Parallel tuned with switched capacitance decade box. Fed into gate of FET source follower. Roger G3XBMhttps://www.blogger.com/profile/13673890140751539870noreply@blogger.comtag:blogger.com,1999:blog-9071048343455395511.post-57346874390479258522013-06-08T10:21:15.261+01:002013-06-08T10:21:15.261+01:00Nice results, thanks for info. Do you have some ad...Nice results, thanks for info. Do you have some additional info abt. the TX antenna and the design of the RX loop ?Earthquakedetector Appingedamhttps://www.blogger.com/profile/16659514698717241843noreply@blogger.com