one used Microsemi Symmetricom SyncServer S100 NTP server, GPS discplined Rubidium standard, Furuno GT-8736D inside, no any GPS problem; 799 USD;
S100 use the same design as S3xx (power supply is 125W, many components on the motherboard have been omitted, also all the BNC port), the original Rubidium module use Symmetricom SA.22C, but the SA.22C only one 10MHz output port, all the external port already cut from the motherboard already, so will NO external 10MHz output port, I just changed it to X72, it has 2 10MHz port, one port (FACMOS) used for the motherboad, another port (Sine wave) directly to the added BNC port.
the inside X72 Rubidium module already calibrated by me (1/22/2026), if no GPS, the 10MHz still accurate;
the IP address is 192.168.1.100;
the GPS module already upgraded to Furuno GT-8736D (with high sensitivity);
the GPS antenna port is BNC (+12V), if you need, just check my shop;
ship to US 48 states in free.
https://www.ebay.com/itm/187978891746https://www.ebay.com/itm/187978890976