[time-nuts] Can a quartz crystal go off by 2% ?

[Peter Vince]

Hi Rob,

     Actually they are controlled from a low bit-rate signal
phase-modulated onto Radio-4 long-wave (198KHz).  If you have an SSB
or CW receiver that tunes down to that frequency, switch on the BFO
and look at the output on something like Spectrum Lab, and the phase
modulation is readily seen!

     TTFN,  Peter


2009/12/29 Rob Kimberley <rk at timing-consultants.com>:
> AFIK a lot of the clocks were radio controlled from MSF Rugby (now Anthorn,
> Cumbria). You would need to have some sort of automated system to
> accommodate daylight savings switchovers in Spring and Autumn. That said, I
> would have thought once synchronised, they would "tick" off the 50 Hz
> supply.
>
> Rob Kimberley