FN: using a many-turn tuning coil as an R.F. choke remember that its magnetic field must not extend to other apparatus, or unwanted coupling effects will arise that would not be troublesome if the spacing were O.K.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19291227.2.68
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Radio Record, Volume III, Issue 24, 27 December 1929, Page 31
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37Untitled Radio Record, Volume III, Issue 24, 27 December 1929, Page 31
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