Ramsey Electronics TV6 Manual page 17

Here are the primary "dos and don'ts" picked from the current FCC Rules, as
of May, 1990. This is only a brief look at the rules and should not be construed
to be the absolute complete legal interpretation! It is up to you to operate within
the proper FCC rules and Ramsey Electronics, Inc. cannot be held responsible
for any violation thereof.
1. Part 15 discusses various transmitters such as "wireless microphones" (for
example, the Ramsey FM-1, FM-4, etc.), cordless telephones and the like. In
general, the FCC permits various unlicensed transmitters provided that they DO
NOT cause ANY interference to authorized users. The FCC appears to
recognize the "wireless" ways of the world and allows such transmitters as long
as interference is not caused. Specific rules and electrical limits have been
written to assure this.
2. It is the sole responsibility of the builder-user of any TV or FM broadcast-
band device to research and fully avoid any and all interference to licensed
broadcast transmission and reception. This instruction manual gives you
practical advice on how to do a good job of finding a clear frequency, if one is
available.
3. For some frequency bands, the FCC sets 100 milliwatts (0.1 watt) as the
maximum permitted power output for unlicensed, home-built transmitting
devices, and that the combined length of your antenna and feedline (coaxial
cable or other) must not exceed 10 feet. The technical standards for the VHF
and UHF frequency bands are very different, primarily concerned with band
width and RF field strength.
4. 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."
5. The most specific FCC regulation of unlicensed operation is that the "field
strength" of the signal must not exceed 100 microvolts/meter at a distance of 3
meters from the transmitter (FCC rule 15.209). 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.
TV6 • 17