Sec. 15.204  External radio frequency power amplifiers and antenna 
          modifications.

    (a) Except as otherwise described in paragraph (b) of this section, 
no person shall use, manufacture, sell or lease, offer for sale or lease 
(including advertising for sale or lease), or import, ship, or 
distribute for the purpose of selling or leasing, any external radio 
frequency power amplifier or amplifier kit intended for use with a Part 
15 intentional radiator.
    (b) A transmission system consisting of an intentional radiator, an 
external radio frequency power amplifier, and an antenna, may be 
authorized, marketed and used under this part. However, when a 
transmission system is authorized as a system, it must always be 
marketed as a complete system and must always be used in the 
configuration in which it was authorized. An external radio frequency 
power amplifier shall be marketed only in the system configuration with 
which the amplifier is authorized and shall not be marketed as a 
separate product.
    (c) Only the antenna with which an intentional radiator is 
authorized may be used with the intentional radiator.
[ 62 FR 26242 , May 13, 1997]