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An RF choke can be used in place of a balun. If a coil is made using coaxial cable near to the feed point of a balanced antenna, then the RF current that flows on the outer surface of the coaxial cable can be attenuated. One way of doing this would be to pass the cable through a ferrite toroid.
Homemade 1:1 balun using a ring of ferrite around which the coaxial cable is wrapped. This simple RF choke impedes signals passing on the outside of the braid, which helps to cure television interference. A braid-breaker is a filter that prevents television interference (TVI).
A coax balun is a cost-effective method of eliminating feeder radiation but is limited to a narrow set of operating frequencies. One easy way to make a balun is to use a length of coaxial cable equal to half a wavelength. The inner core of the cable is linked at each end to one of the balanced connections for a feeder or dipole.
The name "choke" is used because the equal and opposite (anti-parallel, balanced) currents in the coax or paired wires cancel each others' magnetic fields, allowing them to pass through unhindered, but magnetic field of the unbalanced flow inhibits the unbalanced current, "choking" it off. Similar reasoning applies to the name "line isolator".
With no matching unit, Varney specified 75 Ω cable be used at the junction of the ladder line and coax (not 50 Ω); the higher 75 Ω impedance makes a closer match the end of the ladder line. An earth-grounded 4:1 voltage balun may be used to connect the coax to the ladder line, and 1:1 current balun should be used between the coax and the ...
The transmission line choke balun depicted is not any sort of transformer. A transformer transforms. The common mode choke with coaxial windings around the ferrite works fine as a balun but isn't a transformer. Think about it for a second. The inner conductor of the coax only has a magnetic effect on the inner surface of the shield and vice versa.