Where is the Official Time generator?, answer to this question is not so easy: along the World there are many Time Generators that use an Atomic Watch to transmit its pattern signal to many devices able to receive an electromagnetic longwave carrier.

There are several clock signal transmitters in different countries such as:

DCF77-77.5kHz (Germany), HBG-75kHz (Switzerland), MSF-60kHz (United Kingdom), TDF-162kHz (France), JJY-40&60kHz (Japan), WWVB-60kHz (USA), DCF49 (Germany): 129,1 kHz (using to remote control electric power distribution grids throughout Germany).

Premo group has developed the first radio clock receiver antenna in SMD technology (RCA-SMD series), in the market for applications (automotive, outdoor lamp switch-on-off control, etc)

Standard SMD version of this new radio clock antenna (at 40, 60 and 77.5 kHz) will be available in the market by Q3-2009. Others through-hole and flying-lead versions including others resonance frequencies are under development by Q4-2009.

Next figure show a typical resistance at resonance of RCA-SMD receiver clock antenna.

 

These kind of antennas are configured as L-C resonant parallel tank (RCA-SMD-77A: 1.3mH // 3.3nF for 77.5 kHz and RCA-SMD-60A: 2.1mH // 3.3nF for 60 kHz) which offer a higher resistance (more than 75 kOhms) at resonance frequency (+/- 0.2 kHz).
 

More info about dimmensions and pad lay-out, visit the next link:

RCA-SMD-77A