So the first generation watches had low frequencies of a few kilohertz, limiting their accuracy.
The vibration frequency is chosen to be the resonant frequency of the block, typically in the 100 kilohertz to 1 megahertz range.
However, losses through stray capacitance increase with increasing clock frequency and a practical limit is around a few hundred kilohertz.
It is heard over the amplitude modulation band occupying the frequency of 648 kilohertz.
The station then moved to 580 kilohertz in 1928, and to 1030 kilohertz in 1931.
The station operated at 1240 kc. (as kilohertz was known then).
The station operated at 1410 kilohertz for much of its existence.
Absence of output transformer and global negative feedback extends full power frequency response into hundreds of kilohertz.
