[GE] GE MDX?

[Glenn Little WB4UIV]

I have a board that I picked up at a recent hamfest.
This is 19D901958G5 with a board number of 188D5062G4.
LBI 39017E covers through group 3.
Board 188D5062G4 covers 585-505 MHz.
The helical filters cover 470-492 MHz (group 3).
The VCO is 19D901958G5 covering 470-512 MHz.
What would be different between G3 and G5?
Is this board good for anything but parts?
Is the VCO coverage of 470-512 the actual output frequency or is it 
offset by receiver IF?

Thanks for any help.
73
Glenn
WB4UIV