Sec.  2.1505   Test instrumentation and equipment.

   (a) Receiver (field intensity meter). A calibrated field intensity meter
   (FIM) with a frequency range of 30 to 1000 MHz is required for measuring
   radiated emission levels. This instrument should be capable of making peak
   measurements with a bandwidth of 100 kHz.

   (b) Spectrum analyzer. Spectral measurements are to be made with a spectrum
   analyzer with a minimum resolution bandwidth no greater than 10 Hz. The
   video filter, if used, should have a bandwidth wide enough so as to not
   affect peak readings. A linear video output is desirable for performing
   measurements of modulation characteristics.

   (c) Storage oscilloscope. Measurements of modulation characteristics are to
   be made using a calibrated storage oscilloscope. This instrument is to be DC
   coupled and capable of manually triggered single sweeps.

   (d) Frequency counter. A frequency counter with an accuracy of at least 5
   parts per million is required for measuring the carrier frequency.

   (e) Signal generator. A calibrated signal generator with an output of at
   least 75 mW at 121.5 and 243 MHz is required for generating a reference
   signal for site calibration.

   (f) Antenna. Radiated emissions are to be measured with calibrated, tuned,
   half-wave dipole antennas covering the frequency range of 30 to 1000 MHz.

   (g)  Temperature chamber. Tests which call for subjecting the EPIRB to
   temperature levels other than the ambient temperature are to be performed in
   a temperature test chamber which can be adjusted to stable temperatures from
   −20 to +55  °C. This chamber is to be of sufficient size to accommodate the
   EPIRB under test.

   (h) Vibration table. A vibration table capable of vibrating the EPIRB with a
   sinusoidal motion is required. The table must be capable of varying the
   frequency of vibration either linearly or logarithmically over a range of 4
   to 33 Hz with maximum peak amplitudes of up to 2.5 mm.

   (i)  Salt  fog  chamber.  A chamber capable of producing salt fog at a
   temperature of 35  °C for 48 hours is required. This chamber is to be of
   sufficient size to accommodate the EPIRB under test.

   (j) Drop test facility. A facility which will permit dropping an EPIRB from
   a height of 20 m into water is required. The water must be deep enough so
   that the EPIRB will not touch bottom when dropped.

Environmental and Operational Test Procedures