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Master Clocks and
Time Distribution

Mitchell Janoff
Telechron Master B


Telechron Master A Restore Project
Telechron Master Type B
Telechron Master Program Clock 131A Type 1664AR
Telechron Documents
Master Clock Collection
SWCC Clock Collection
HP 3816A GPS Disciplined Frequency Standard and Time Display
HP Time and Frequency Rack
Self Winding Clocks and Synchronizing
GPS Clock Status(Z3801A)
GPS Clock Status (Z3816A)
GPS 3810 Installation
GPS Clock Status (Lucent-A 24361)
GPS Clock Status (Lucent-B 24361)
Poole Clock
Meter Clock (with NTP Interface)
60Hz Frequency Standard
Crouse Hinds Time Clock
Silvertone AM-SW Restoration Project
janoff law website

Mitchell Janoff has been collecting and restoring master clocks, slave clocks, and precision frequency standards for the past ten years. His interests are primarily in time keeping and time distribution with a focus on clocks made by the Self Winding Clock Company of New York (SWCC). He has over twenty SWCC clocks, all of which receive hourly synchronization signals from a computer based "master clock" every hour on the hour. or more information on synchronizing self winding clock see the 1995 article from the NAWCC Bulletin "Self Winding Clock Synchronization".