Synchronous data transmission systems are designed to indicate the position of a component or control surface that cannot be directly observed. The systems fall into one of two categories; d.c. systems called 'Desynn Systems'
There are a variety of different types of Desynn systems available:
The Basic Desynn is generally operated by a rotary motion, however linear versions are also found. The conversion from linear to rotary motion being achieved by a push rod and gear wheel.
The Micro Desynn was designed to magnify the small movement obtained by such items as pressure measuring devices. They are operated by linear motion.
The Slab Desynn was designed to overcome signally errors inherent in the basic Desynn system. In the vast majority of instances the errors in the basic Desynn
Basic Desynn
In the basic Desynn system the transmitter comprises an endless resistance wound on a circular former, this arrangement being referred to as a 'Toroidal Resistance'. Equally spaced at 120° intervals around the resistor are 3 tappings, it is to these that the signal wires are connected. Running on the resistor are two wiper arm type contacts that are spaced apart by 180° and insulated from one another, it is to these that system power is applied.
The indicator comprises a two pole permanent magnet rotor, pivoted to rotate inside a soft iron stator, the pointer being attached to the spindle. The stator carries three star connected windings that are connected to the three wires coming from the tappings of the transmitter.
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