Ramsey Electronics FM10A - Manual (Page 20)

held responsible for any violation thereof.
1. In the past, no "two-way communications" use of the 88-108 MHz FM
broadcast band was permitted. This prohibition does not appear in the
current edition of Part 15. Previous editions of Part 15 discussed "wireless
microphones" (such as Ramsey FM-1, FM-4, etc.), while the June 23, 1989,
revision eliminates this discussion in favor of more detail regarding computer
and TV peripherals and other modern electronic conveniences. However, it
is not immediately clear that the 1989 revision of the FCC Rules Part 15
necessarily "cancels" previous regulations. Laws and rules tend to remain
in force unless they are specifically repealed. Also, FCC Rule 15.37
discusses "Transitional Provisions for Compliance with the Rules," and
states in item (c): "There are no restrictions on the operation or marketing of
equipment complying with the regulations in effect prior to June 23, 1989."
2. It is the sole responsibility of the builder-user of any FM broadcast-band
device to research and fully avoid any and all interference to licensed FM
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 88-108
MHz are very different, primarily concerned with band width and RF field
strength.
4. FCC Rules do not differ for "stereo" or "monaural" transmissions.
5. Broadcasting on the grounds of a school (AM emissions only) is
specifically permitted and encouraged between 525 and 1705 KHz under
Part 15.221. Use our AM-1 AM radio broadcast kit for this use.
6. FCC Rule No. 15.239 specifically addresses operation in the 88-108
MHz FM broadcast band for which your FM10A transmitter kit is designed.
However, this Rule does not, by itself, tell you everything you need to know
about using a device of this kind. Therefore, we are noting a series of Part
15 regulations which should be observed:
•
a. The transmitter must NEVER be tuned to a frequency above 108
MHz, specifically the band 108-121.94 MHz, FCC Rule 15.205 lists this
band as restricted, due to potential interference with aircraft navigation
equipment.
•
b. The "bandwidth" of your transmission is limited to 200 KHz, centered
on the actual operating frequency. Since 200 KHz is enough spectrum