[Code of Federal Regulations]

[Title 47, Volume 5]

[Revised as of October 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR101.143]



[Page 655]

 

                       TITLE 47--TELECOMMUNICATION

 

        CHAPTER I--FEDERAL COMMUNICATIONS COMMISSION (CONTINUED)

 

PART 101_FIXED MICROWAVE SERVICES--Table of Contents

 

                      Subpart C_Technical Standards

 

Sec.  101.143  Minimum path length requirements.



    (a) The distance between end points of a fixed link in the private 

operational fixed point-to-point and the common carrier fixed point-to-

point microwave services 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:



------------------------------------------------------------------------

                                                               Minimum

                    Frequency band (MHz)                     path length

                                                                 (km)

------------------------------------------------------------------------

Below 1,850................................................          N/A

1,850 to 7,125.............................................           17

10,550 to 13,250...........................................            5

Above 17,700...............................................          N/A

------------------------------------------------------------------------



    (b) For paths shorter than those specified in the table in paragraph 

(a) of this section, 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 

Section 101.113(a).

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 to paragraph (c): Links authorized prior to April 1, 1987, need 

not comply with this requirement.



[61 FR 26677, May 28, 1996, as amended at 65 FR 38330, June 20, 2000]