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
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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 …
Computer to Rig Interfacing You Don’t Need to …
audiosystemsgroup.com1 Computer to Rig Interfacing – You Don’t Need to Buy an Interface! Jim Brown K9YC Santa Cruz, CA http://audiosystemsgroup.com Interconnections Needed
Transmission Lines at Audio Frequencies, and a Bit …
audiosystemsgroup.comCable, Transmission Lines, and Shielding for Audio and Video Systems Page 3 0.08 dB/mile at 300 Hz, 0.102 dB/mile at 1 kHz, and 0.107 dB/mile at 3 kHz.
Jim Brown K9YC Santa Cruz, CA http://k9yc
audiosystemsgroup.comCoaxial Transmitting Chokes Jim Brown K9YC Santa Cruz, CA http://k9yc.com
Coaxial Transmitting Chokes - Audio Systems Group
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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