In an past thread here (almost 20 years ago) incited by and in response to rumors that Keith Hamilton (of Rangemaster) was the designer behind the once popular LPB AM-2000 transmitter, was debunked by the late Ermi Roos who at the same time also provided some interesting info about the LPB AM-2000, the designers and company owners. Also of note is the LPB never had a schematic associated with it and that the owner of LPB at the time said "the Rangemaster is superior to the AM-2000, particularly because it has better modulation characteristics."
https://www.part15.org/rangemaster-review-in-radio-world/
Ermi Roos says
February 12, 2008 at 3:03 pm
AM-2000 loading coil
Looking at the picture of the LPB AM-2000 in the Radio World article, on the right side of the box containing the milliammeter, there is a small loading coil wound on a ferrite rod. The picture, unfortunately, does not show the loading coil very clearly.
When I asked John Devecka why LPB located the loading coil inside the box instead of using a larger, higher Q, air-wound coil on the outside, he cited compliance with the Part 15.219 regulations. He thought that the FCC may not approve of a loading coil outside of the box. The Rangemaster’s loading coil is the secondary of the RF transformer that couples the final stage of the transmitter to the antenna, which is wound on an iron powder toroid.
The resemblance between the Rangemaster and the AM-2000 is striking. Both are boxes with CB antennas attached to the top. It’s no wonder that some people thought that both transmitters were designed by the same person. ....
... Incidentally, when I talked to John Devecka, I mentioned that I was not able to get a schematic diagram for the AM-2000 from LPB. LPB provides schematics for several of their products on their web site, but not for the AM-2000. The service department wouldn’t help, either. John told me that there is no schematic for the AM-2000. Dale Head had his own private notes, but there never was any schematic in the company’s drawing files."