Ramsey Electronics FM10A - Manual (Page 21)

space for several different FM stations, this is a "generous" limitation
designed to accommodate cruder FM devices. Properly built and
adjusted, the FM10A kit operates well within this limit. In fact, its signal
should sound no "wider" than any other FM station when listening on an
ordinary FM radio.
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c. FCC Rule 15.215(a) says: "Unless otherwise stated, there are no
restrictions as to the types of operations permitted under these
sections." This general provision appears to leave you free to use your
FM stereo transmitter in a manner similar to operations of an FM
broadcasting station, or to use it for any other non-interfering, practical
application.
•
d. FCC Rule 15.5: General conditions of operation: "(b) Operation...is
subject to the conditions that no harmful interference is caused and that
interference must be accepted that may be caused by the operation of
an authorized radio station, by another intentional or unintentional
radiator, by industrial, scientific and medical equipment, or by an
incidental radiator. (c) The operator of a radio frequency device shall be
required to cease operating the device upon notification by a
Commission representative that the device is causing harmful
interference."
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e. The most specific FCC regulation of 88-108 MHz FM Broadcast band
unlicensed operation is that the "field strength" of the signal must not
exceed 250 microvolts/meter at a distance of 3 meters from the
transmitter (FCC rule 15.239). If you have any concern about this
emission limit, have your device checked by a technician with accurate
measuring equipment. Remember that the "field strength" of a signal is
determined as much by the antenna as by the RF output of the
transmitter itself.