Basic Interference Mechanisms Understanding and ...
5 Golden Rules to Avoid RFI • Loudspeaker Cables –Always use TWISTED PAIR –Shielding is not important –Exotic cable is a waste of money • Mic and Line level Cables –Avoid drain wires in shields –Use braid shielded cable –Use twisted pair (tighter twist helps too) Golden Rules to Avoid RFI • Maximize audio levels on cables –Run output stages near their maximum
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Understanding How Ferrites Can Prevent and …
audiosystemsgroup.comUnderstanding How Ferrites Can Prevent and Eliminate RF Interference to Audio Systems Page 3 Fig 6 – Small cores of different lengths cross …
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audiosystemsgroup.com12 Some Common Mode Chokes • A coil of coax at the antenna • A string of ferrite beads around coax (Walt Maxwell, W2DU) • Multiple turns of transmission line through a toroid (Joe Reisert, W1JR) or stack of toroids (W1HIS, K9YC) • Most 1:1 “baluns” are common mode chokes
Working 160M From a Small Lot (and Larger Ones Too)
audiosystemsgroup.comUsing Bottom Loading • Bottom loading at the base works, but burns some power • Using bigger wire helps (#10 good) • In the recent Stew Perry, N6NUL worked JA with 100 watts using an inverted L only about 35 ft tall designed for 80M, adding just enough
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