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To alleviate RF on the outside of a coaxial cable shield a simple three loop air choke can be introduced. The coaxial cable can be wrapped three times around a piece of PVC that is 2.5" to 3". Basically, not so tight as to damage the cable, but no large a loop as to nullify the effective choking of the unwanted RF.== RF Balun Examples ===== Coiled-Coax Balun ===To alleviate RF on the outside of a coaxial cable shield a simple three loop air choke can be introduced. You can make a simple current balun by coiling coaxial feedline in a particular way. The coil inductance and distributed capacitance resonate as a parallel trap whose high impedance inhibits unwanted shield current. The coaxial cable can be wrapped three times around a piece of PVC that is 2.5" to 3". Basically, not so tight as to damage the cable, but no large a loop as to nullify the effective choking of the unwanted RF.=== Ferrite Chokes ===Rather than constructing an air coil you can place a ferrite choke on the coaxial cable. The ferrite will increase the cable common-mode impedance without affecting its differential impedance.