Summary - Ramsey Electronics FM10C Manual

cular area of about 114 acres. A quick glance at stereo FM receiver
specifications shows typical sensitivity of 1.7 µV before considering
high-gain antennas or preamplifiers. Your non-licensed signal can
provide serious competition to a public broadcast station fifty miles
away, a station which someone in your neighborhood may have set up
a special antenna to enjoy.
Calibrated "field strength meters" such as described in the ARRL Radio
Amateur's Handbook can detect signals down to about 100 microvolts. To
measure RF field strength below such a level, professional or laboratory
equipment and sensitive receivers are required. A "sensitive" receiver re-
sponds to a signal of 1 or even .5 microvolt "delivered" to the receiver input
by antenna. If the antenna is not good, the receiver cannot respond to the
presence of fractions of a microvolt of RF energy.

SUMMARY

The present edition of Part 15 of the FCC rules does not provide detailed
guidance on ALL aspects of using a low-power transmitter such as the
FM10C. The main point is that you may not cause any interference whatso-
ever to licensed broadcast services and that you must be willing to put up
with any interference that you may experience.
In addition to operations not requiring authorization, you also have the option
of writing a clear and polite letter to the FCC Engineer-in-Charge of your lo-
cal district, describing your intended operation. Mention the operating fre-
quency and planned hours of operation. This could be a good step to take if
your project is on behalf of a school, Scout or community group.
If you become further fascinated with the service rendered by low-power
broadcasting, other FCC regulations explain how to apply for a license or
other authorization which may permit you to upgrade your FM10C or other
equipment to accomplish any objective which the FCC sees to be in the pub-
lic interest and not interfering with other authorized uses of the radio spec-
trum.
Lawful use suggestions for the FM10C
1. Build and adjust this kit strictly according to the published instruc-
tions.
2. Use the whip antenna supplied with the Ramsey case set, CFM.
3. Do not modify your kit in any way.
FM10A 30