Hi,
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I have scanned and uploaded my collection of (historical?) Wellbrook price lists and data sheets from 1999, 2004 and 2007. Hopefully that may help people trying to date the various products and the development.
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/g/loopantennas/files/wellbrook_datasheets
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Also worth mentioning that the polarity of the antenna interface connector changed from +ve to -ve inner at some point, and maybe changed back again on later models? I have some from 2007 that are -ve inner that came with LFL1010 loops and the instruction manuals reflect this.
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73
Nick
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Nick B.