I did a rather extensive round of tests on this transmitter, which I stumbled upon for sale on ebay.
Please note this is in NO WAY connected to the Hamilton Rangemaster folks. But thats how I stumbled upon this transmitter.
This transmitter claims to be FCC Part 15 certified, but that's clearly not possible as my report will show. This is an excellent example of how a complete neophyte to Part 15 broadcasting can get sucked into buying a very illegal transmitter. Pour a cup of coffee and have a look:
http://www.ironrangecountry.com/failsafetransmitter.pdf
TIB