On the topic of minimum hardware to use a TBolt, I am interested in observing clock pendulums. WWV is a long way from Australia and only available with good propagation. A GPS receiver will give accurate seconds signals, even if there is some jitter, however it is not easy to identify which second. In the course of a year it is quite believable that a counter may gain or lose one count, what with lightning strikes etc. Minute markers would be sufficient, any clock that can not tell you which minute in the year it is, is not worth observing. The GPS may drop out, so a disciplined oscillator is in order, but how can you get the GPS signals parsed to identify say minute markers without running a computer? All I need is black box which gives seconds pulses and a beep every minute. With a small 4 channel data logger I can then record a clock for a year and its relationship to UTC, temperature and barometric pressure. I would only need a battery backup power supply for the TBolt. cheers, Neville Michie
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