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[aprssig] MURS

KCøRNP Richard kc0rnp at kc0rnp.net
Thu Jan 11 02:10:45 UTC 2007

The FCC rules governing the Multi Use Radio Service (MURS) have
changed recently (November 12, 2002). The information below reflects
the new (current) rules.

The citations below in brackets [] are from the MURS Rules, Part 95 of
Title 47 of the Code of Federal Regulations, especially Subpart J.
Click here to go to the MURS Rules themselves.

In general:

    * MURS permits the use of a variety of emission modes, but the
most common is analog voice using FM modulation. Data communications
are permitted, but the FCC prohibits image transmissions. [95.401]

    * Very narrow bandwidth transmissions (maximum 11.25 KHz channel
bandwidth, with +/- 2.5 KHz deviation) are permissible on all five
MURS channels. The older +/- 5 KHz deviation signals (with a maximum
20 KHz channel bandwidth) are also permitted (but not required) on the
two upper channels (in the 154 MHz band). [95.631]

    * The FCC prohibits continuous transmissions in any mode except by
"grandfathered" (former Part 90) business-type licensees. [95.631(j)]

    * The maximum permissible Transmitter Power Output (TPO) is 2
Watts. There is no limit on antenna gain. [95.639(h)]

    * MURS is intended for short-range local communications. Antenna
height is limited to 20 feet above structure or 60 feet above ground,
whichever is the greater. [95.1315]

    * Repeaters (stations that retransmit simultaneously) and
store-and-forward packet stations are not allowed. [95.1311]

    * No license is needed. MURS is available for unlicensed business
or personal use as described in this discussion. [95.1301]

    * Radios suitable for use on the MURS channels are now available
from dozens of different manufacturers, and are sold by several online
companies and by consumers electronics store chains.

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