Goto Section: 78.107 | 78.109 | Table of Contents
FCC 78.108
Revised as of October 2, 2015
Goto Year:2014 |
2016
§ 78.108 Minimum path lengths for fixed links.
(a) The distance between end points of a fixed link must equal or exceed the
value set forth in the table below or the EIRP must be reduced in accordance
with the equation set forth below.
Frequency band (MHz) Minimum path length (km)
12,200 to 13,250 5
Above 17,700 N/A
(b) For paths shorter than those specified in the Table, the EIRP shall not
exceed the value derived from the following equation.
EIRP = MAXEIRP − 40 log(A/B) dBW
Where:
EIRP = The new maximum EIRP (equivalent isotropically radiated power) in
dBW.
MAXEIRP = Maximum EIRP as set forth in the Table in § 74.636 of this part.
A = Minimum path length from the Table above for the frequency band in
kilometers.
B = The actual path length in kilometers.
Note to paragraph (b): For transmitters using Automatic Transmitter Power
Control, EIRP corresponds to the maximum transmitter power available, not
the coordinated transmit power or the nominal transmit power.
(c) Upon an appropriate technical showing, applicants and licensees unable
to meet the minimum path length requirement may be granted an exception to
these requirements.
Note: Links authorized prior to April 1, 1987, are excluded from this
requirement, except that, effective April 1, 1992, the Commission will
require compliance with the criteria where an existing link would otherwise
preclude establishment of a new link.
[ 52 FR 7145 , Mar. 9, 1987, as amended at 68 FR 12776 , Mar. 17, 2003]
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Goto Section: 78.107 | 78.109
Goto Year: 2014 |
2016
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