I am in need of a circuit that will place minute mark ,second 59 or second zero of UTC, into my homebuilt circuit for calibration purposes. I have thought of possibly building a 32768Hz oscillator and using a looping binary counter that can be calibrated using WWV or WWVB but this all sounds silly to me since there must be calibration clocks already out there. I need either one with a TTL output or even better an FET switch or something like that with a mark I can feed directly into the back end of my circuit just before the signal hits the A/D converter. The stability of the oscillator would be most important not to deviate more than +/-0.03 Hz. My laptop has a RTC that looses one second of time every four point five hours so it is completely unsuitable for anything other than getting the time close enough to understand what the calibration mark means.
Could someone who is an engineer provide me with a schematic to do this ? The basic idea seems simple for those educated in the EE field. It is the stable oscillator that eludes me. Should it be a Colpitts/Heartly/Winbridge ??? What kind ?
Any help here is appreciated. Sincerely; snipped-for-privacy@yahoo.com