§ 74.735   Power limitations.

   (a) The maximum peak effective radiated power (ERP) of an analog low power
   TV, TV translator, or TV booster station shall not exceed:

   (1) 3 kW for VHF channels 2-13; and

   (2) 150 kW for UHF channels 14-69.

   (b) The maximum ERP of a digital low power TV, TV translator, or TV booster
   station (average power) shall not exceed:

   (1) 3 kW for VHF channels 2-13; and

   (2) 15 kW for UHF channels 14-69.

   (c) The limits in paragraphs (a) and (b) apply separately to the effective
   radiated  powers  that  may  be obtained by the use of horizontally or
   vertically  polarized  transmitting antennas, providing the applicable
   provisions  of § § 74.705, 74.706, 74.707 and 74.709 are met. For either
   omnidirectional  or  directional antennas, where the ERP values of the
   vertically and horizontally polarized components are not of equal strength,
   the  ERP  limits  shall apply to the polarization with the larger ERP.
   Applications  proposing the use of directional antenna systems must be
   accompanied by the following:

   (1) Complete description of the proposed antenna system, including the
   manufacturer and model number of the proposed directional antenna. It is not
   acceptable to label the antenna with only a generic term such as “Yagi” or
   “Dipole”.  A  specific  model  number must be provided. In the case of
   individually designed antennas with no model number, or in the case of a
   composite antenna composed of two or more individual antennas, the antenna
   should be described as a “custom” or “composite” antenna, as appropriate. A
   full description of the design of the antenna should also be submitted.

   (2) Relative field horizontal plane pattern (horizontal polarization only)
   of the proposed directional antenna. A value of 1.0 should be used for the
   maximum radiation. The plot of the pattern should be oriented so that 0�°
   corresponds  to  the  maximum radiation of the directional antenna or,
   alternatively in the case of a symmetrical pattern, to the line of symmetry.
   The 0�° on the plot should be referenced to the actual azimuth with respect
   to true North.

   (3) A tabulation of the relative field pattern required in paragraph (c)(2),
   of this section. The tabulation should use the same zero degree reference as
   the plotted pattern, and be tabulated at least every 10�°. In addition,
   tabulated  values of all maximas and minimas, with their corresponding
   azimuths, should be submitted.

   (4) All horizontal plane patterns must be plotted to the largest scale
   possible on unglazed letter-size polar coordinate paper (main engraving
   approximately  18  cm × 25 cm (7 inches × 10 inches)) using only scale
   divisions and subdivisions of 1, 2, 2.5 or 5 times 10-nth. Values of field
   strength on any pattern less than 10% of the maximum field strength plotted
   on that pattern must be shown on an enlarged scale.

   (5) The horizontal plane patterns that are required are the patterns for the
   complete directional antenna system. In the case of a composite antenna
   composed of two or more individual antennas, this means that the patterns
   for the composite antenna composed of two or more individual antennas, not
   the patterns for each of the individual antennas, must be submitted.

   [ 30 FR 8847 , July 14, 1965, as amended at  41 FR 28267 , July 9, 1976;  47 FR 21500 , May 18, 1982;  48 FR 21487 , May 12, 1983;  52 FR 7423 , Mar. 11, 1987;
    52 FR 31404 , Aug. 20, 1987;  58 FR 44951 , Aug. 25, 1993;  62 FR 26722 , May 14,
   1997;  76 FR 44828 , July 27, 2011]

   return arrow Back to Top