The TrueTime XL-DC-602 is a GPS receiver that provides NTP over Ethernet and outputs a highly stable 10 MHz reference.
I'm not certain if this is just an issue with the specific model I have but setting the year properly via function 68 ends up showing the incorrect day. Setting it to 2006 doesn't affect NTP and allows the unit to properly display/output the time. Controlling the device via RS232 serial is well documented, though one thing that tripped me up is that by default it boots with function 08 enabled. Press Ctrl-C to exit and enter command mode.
These devices came configured with a large variety of options and it can be difficult to tell exactly what you're going to receive based on just the seller's listing in most cases. My unit outputs 1, 5, and 10 MHz square waves and is not equipped with the sine output option. I'm using a Mini-Circuits band pass filter to AC couple the output and clean up the signal:
I also have two -6dB attenuators to bring the level down before it goes into the distribution amplifier and out to the test equipment. Input above 3 Vpp on the distribution amplifier results in distortion of the output and is way higher than I need to drive my equipment anyway.
The Marconi signal generator always complains about low reference level (regardless of the actual level) when first powered on but the error goes away after a few minutes.
For the moment I am using an Extron CVDA 6 MX Dual Composite Video Distribution Amplifier to get the 10 MHz signal out to my test equipment. This device uses an Intersil EL2099 op amp internally.
The termination resistors were replaced with 50Ω resistors to give a better match for my cables and test equipment. One drawback of this unit is lack of isolation between ports. At some point in the future I plan to design a distribution amplifier with port isolation.
Distribution Amplifier example projects:
Test equipment 10 MHz reference input levels