The LC‑XO Plus is a low‑cost desktop GPSDO module kit that delivers ±50 ns RMS 1 PPS accuracy when GPS‑locked and holdover stability better than ±50 µs over three hours at 25°C without motion. It outputs 1 PPS via 3.3 V CMOS and provides USB serial control with SCPI‑99 and NMEA support. Operating on the GPS L1 C/A 1574 MHz band, it works with active or passive antennas powered at 5 V. Its 50‑channel receiver supports SBAS systems such as WAAS, EGNOS, and MSAS, with acquisition sensitivity of −142 dBm and tracking sensitivity of −158 dBm. ADEV reaches below 5E‑12 at 10,000 seconds, and the unit stabilizes within five minutes at 25°C to 1E‑08 accuracy, powered through USB or an auxiliary 4–5.25 V input.

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