The ULN 1100 is a high‑stability GPS‑locked oscillator providing ±30 ns RMS 1 PPS accuracy and frequency accuracy better than ±3E‑10 after one hour of GPS lock. Holdover stability remains within ±7 µs over 24 hours at 25°C with no motion. Its ADEV ranges from 5E‑12 to 9E‑12 between 1 and 1000 seconds under GPS lock. The module outputs three GPS‑disciplined 1 PPS signals (CMOS, LVDS, RS‑232) and nine frequency outputs: seven at 100 MHz (LVDS and +7 dBm) and two at 10 MHz (CMOS and sine). It supports SCPI‑99 and NMEA control, uses the GPS L1 C/A band, works with passive or active antennas, and includes a 50‑channel receiver with SBAS and Galileo readiness.

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