Stranded microcable widely used in modern equipment, in particular for the connection of input devices of a type well-known joysticks and other peripherals to computers. With all the variety of requirements such microcables, even desirable, to be thin and flexible, does not cause inconvenience and noise during the work, was not torn and did not break from repeated bending. The latter is especially characteristic of cable lines with a miniature push-button joysticks that are holding.
To get such a cable to the radio Amateur from the rural hinterland — it is quite troublesome and expensive. To make a little bit more affordable ersatz is also no easy task. The thin winding wires, even if they are enclosed in rubber or cumbriabuy insulating sheath, mikrokabel no substitute: when to pull harder for a bundle, the shell a little stretched, all the force will be applied to one (the shortest) “gilet” which, of course, will not stand and will break.
I have also developed a special technology on which the core mikrokabel will be able to make it at home even a novice homebrew. On the strength and reliability of the resulting products can be judged by the fact that the resistance to tearing of the effort here is shifted onto insulation — polyflor-vinyl tube which is much stronger than thin wire, even though its stretching.
The secret lies in the features of the PVC. This material, in addition to the plastic (residual) deformation, changing the length and diameter of the tube after removal of the tensile stress, and elastic (which disappears with the termination of mechanical stresses) is an intermediate elastic deformation. Characteristically, the latter disappears immediately with the removal of the stretch, but gradually.