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What is this card?

With those guys, I'm pretty sure "tested" means "looked at it and judged that it probably wouldn't catch fire if it were powered on".
 
Can't be a tuner, not enough stuff on it. The shielded box looks like an RF modulator.
 
DEI is/was big into the security business. Judging from all of the RF inductors on the board, I suspect it was a special-purpose receiver of some sort.
 
Hi
I am guessing it is a composite video to RF converter. Feed in the composite video and the RF modulator converts it for a local closed circuit TV system.

Andrew Lynch
 
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