dcf77 receiver

This is a clock based on DCF77 radio signal (transmitter near frankfurt, Germany), I used a 77.5 khz receiver and I change ferrite loop to improve recepcion (I live in the nortwest of Spain where signal is weak). Ferrite antenna is a long rod (about 25 cm) tuned to 77.5 Khz (L 890 microH C 4.64 nanoF) increassing signal about 6 dB . I used a pic design show in: By other hand, I have improve clock design with a ds1380 chip to backup time and date in other to avoid electric cut. Not shown in this video