HELP! Old Motorola transmitter

[hotwaterwizard2]

Help me find out more about this Transmitter I have had for years.
Motorola
Model # C1541AA/SP21
Trans. Type CC3083
SR#MP011H

117vac

RF Transmitter inside. CTD1480AC
Motorola Schematic Diagram # 63E81054A41

CTD1480AC

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[hotwaterwizard2]

Here are More Pictures

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[hotwaterwizard2]

Looks like I am out of luck here.