 Parkend - Clock Pulse Reception from Norchard
This arrangement transmits a battery pulse from Norchard to Parkend on one wire of the alarm extension pair each time the Norchard clocks are energised. The outgoing pulse is monitored by the line pulse lamp. Relay NCP at Parkend responds to these pulses and causes relays A and B to operate relay PCP for a period equal to the release lag of relay B. This provides a standard length pulse to any Parkend clock. At present the only clock driven by this arrangement is one in the exchange room. Two lamps on the relay set monitor the incoming pulse from Norchard and the outgoing pulse to the clocks. Show diagram as a PDF (146Kb 1 Page)
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