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I couldn't find any info on this thing. What is it? What are it's specs?

LPB manufactured several models of this transmitter. They are capable of 25-30 watts max. The boxes were "FCC type approved" for use on the AM band by licensed commercial or non-commercial campus stations in Part 73 service. Large churches also used them for traffic management, Christmas displays and special announcements by broadcasting through leaky coaxial cable to their parking lot(s).

These transmitters are not Part 15 compliant and are not stable at the lowest power output (approx. 1 watt - over 10-times too much power for Part 15).

I have operated a couple of these units with great success in licensed service as pre-sunrise and post-sunset transmitters for daytimer AM stations (usually in the 10-20 watt range). The LPB low power boxes absolutely require a matched 50 ohm load (a 3 meter antenna will NOT work). They also require NRSC compliant AM processing to work properly due to modulation over-shoot and bandwidth restrictions.

If you could find the diagrams for the AC RF coupling and matching unit, this transmitter would work for carrier current service as well. Once again this is not Part 15 compliant and its operation would be considered a "pirate radio" station by licensed broadcasters and the FCC.