Sec.  15.229   Operation within the band 40.66–40.70 MHz.

   (a)  Unless operating pursuant to the provisions in  Sec. 15.231, the field
   strength  of  any  emissions  within  this band shall not exceed 1,000
   microvolts/meter at 3 meters.

   (b)  As  an alternative to the limit in paragraph (a) of this section,
   perimeter protection systems may demonstrate compliance with the following:
   the field strength of any emissions within this band shall not exceed 500
   microvolts/meter   at   3  meters,  as  determined  using  measurement
   instrumentations employing an average detector. The provisions in  Sec. 15.35 for
   limiting  peak  emissions  apply  where compliance of these devices is
   demonstrated under this alternative emission limit.

   (c) The field strength of any emissions appearing outside of this band shall
   not exceed the general radiated emission limits in  Sec. 15.209.

   (d) The frequency tolerance of the carrier signal shall be maintained within
    ±0.01%  of the operating frequency over a temperature variation of −20
   degrees to +50 degrees C at normal supply voltage, and for a variation in
   the primary supply voltage from 85% to 115% of the rated supply voltage at a
   temperature of 20 degrees C. For battery operated equipment, the equipment
   tests shall be performed using a new battery.

   [ 54 FR 17714 , Apr. 25, 1989, as amended at  55 FR 33910 , Aug. 20, 1990]