[MRCA] Backpack GPS receiver

[Scott Pastor]

Ray,

     It should have an NSN on it somewhere. If you send locate that you can
look up its nomenclature, and then start searching for TMs

-Scott
kc8kbk

On Tue, Sep 30, 2025 at 10:22 AM Ray Fantini via MRCA <mrca at mailman.qth.net>
wrote:

> 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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