Anyone who knows me understands that I don’t only work in obsolete military radios but also dabble in computers and other arcane devices. Picked up a couple things at the Gilbert Red Ball show. One is a ADSID III seismic sensor and that’s an entire story on to itself but also picked up a old backpack portable first generation GPS system. I think this is the military version of the Magnavox MX5400 or maybe a MX6102 but have no real idea beyond that. Unlike the older MX4102 terrestrial Navistar system I suspect this is a GPS system being it has the 1575 MHz patch antenna. Its also powered by a 5590 battery and comes all mounted up to a Allice frame. Anyone have any ideas about this? Suspect that the old GPS systems had some form of issue with date and year display but don’t know if that will keep it from displaying something.

Attached are some pictures.

 

Ray F/KA3EKH

 

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