FIELD: electric engineering, possible use in 220V lines for creating communication channel, which is part of protective television signaling of objects such as cottages, garages, trade posts, and similar objects with no phone or radio connection to police.
SUBSTANCE: invention uses passive-active type generator, which generates current at one frequency, making it possible to reduce the frequency spectrum occupied by communication channel.
EFFECT: increased reliability.
1 dwg
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|---|---|---|---|
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