... level Frequency stability: better than ± 5E-10 (0 ~ 50 °C) 1PPS pulse output 1 channel, BNC Interface, TTL level impedance ... GPS receiver 12 parallel channel GPS receiver Receiver L1, C / A code signal-1575.42MHz Physical and environmental parameters ... supply: -40 ~-60V DC Operating temperature: -10 °C ~ 55 °C Storage temperature: -25 °C ~ 85 °C Humidity: 95% non-condensing Power consumption: <20W ...