... reliability and availability.The average frequency accuracy better than 1E-12 (continuous tracking GPS signals 24 hours later); meet the ... output 1 channel, BNC, square wave, 75Ω Frequency Accuracy: <1E-12 (GPS lock, 24-hour average) Drifting: ITU-T recommendation G ... : year, month, day, hour and working conditions GPS GPS receiver 12 parallel channel GPS receiver Receiver L1, C / A code signal-1575 ...