NEWSfrom All Quarters of the "World - ericssonhistory.com
NEWSfrom All Quarters of the "World - ericssonhistory.com
NEWSfrom All Quarters of the "World - ericssonhistory.com
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Fig. 3Channel demodulator ZHP 10103/2left, <strong>com</strong>pletely assembledright, case and back plate removedtranslating bay (type ZDG 801), whose dimensions are as given above, isshown in fig. 2.Unit ConstructionDespite <strong>the</strong> desire to have <strong>com</strong>ponents for universal use, units <strong>of</strong> very differentnature electrically must <strong>of</strong>ten unavoidably have different mechanicalcharacter. For this reason two different types <strong>of</strong> unit construction can bedistinguished in <strong>the</strong> first place:1) for units mainly with printed wiring2) for power supply and alarm equipmentUnits Mainly with Printed WiringThis type <strong>of</strong> units is illustrated in figs. 3 and 5. The electrical <strong>com</strong>ponents in<strong>the</strong>se units are to a great extent mounted on a printed wiring card, type TV A201-209. This card has dual functions as a chassis for mechanical assemblyand as <strong>the</strong> wiring between <strong>com</strong>ponents, in <strong>the</strong> form <strong>of</strong> connexions etched out<strong>of</strong> a layer <strong>of</strong> copper foil on one side. To connect <strong>the</strong> <strong>com</strong>ponents to <strong>the</strong> foilFig. 4 X 8232Units occupying a single width module(less cases and back plates).Left, signalling receiver and relaycentre, channel amplifierright, channel demodulator (printed wiring side)118