| Rusty Bolt Effect |
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When radio waves from clean transmitters interact with dirty connections or corroded parts (which would then act as a s and other unwanted signals; a television might then receive and attempt to interpret these signals. If one experiences this problem, one should check both the transmitter and the television for dirty connections or corroded parts. One should also check for signs of Corrosion in the cables which link the equipment to the aerials and for badly made joints. Beyond this, one might check any metal objects near the antenna for Rust or corrosion. Any of these could be the source of the problem. It is possible to cure this problem in several ways:
MATHS ASSOCIATED WITH THE ''RUSTY BOLT'' The Transfer Characteristic of an object can be described by the following two equations. E = Eo K1 + (Eo)2 K2 + (Eo)3 K3 + (Eo)4 K4 ..... etc For an ideal perfect linear object K2, K3, K4, K5 etc are all zero. For a 'rusty bolt' or a Frequency Mixer stage K2, K3, K4 and/or K5 etc are not zero. ''Harmonic generation'' If the incomming signal is a sine wave {Eo sin(ωt)} then the output will be E = Eo K1 sin(ωt) + (Eo)2 K2 sin(2ωt) + (Eo)3 K3 sin(3ωt) + (Eo)4 K4 sin(4ωt) ..... etc Hence by lowering the size of E the harmonics will be greatly reduced. ''Mixing product generation'' Second order Ef1+f2 = k Ef1 x Ef2 Ef1-f2 = k Ef1 x Ef2 Third order Ef1+f2+f3 = k Ef1 x Ef2 x Ef3 Ef1-f2+f3 = k Ef1 x Ef2 x Ef3 Ef1+f2-f3 = k Ef1 x Ef2 x Ef3 Ef1-f2-f3 = k Ef1 x Ef2 x Ef3 Hence the second order, thrid order and higher order mixing products can be greatly reduced by lowing the intensity of the original signals (f1, f2, f3, f4 ...... fn) |
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