47 C.F.R. Subpart N—FCC Procedure for Testing Class A, B and S Emergency Position Indicating Radiobeacons (EPIRBs)
Title 47 - Telecommunication
Source: 56 FR 11683, Mar. 20, 1991, unless otherwise noted.
The procedure described herein sets forth uniform methods for testing Class A, B and S Emergency Position Indicating Radiobeacons (EPIRBs) for compliance with the applicable portions of the FCC Rules and Regulations. Other methods and test results may be used provided they are fully documented and deemed by the Commission to yield results equivalent to the procedures set forth in this section.
Title 47: Telecommunication
PART 2—FREQUENCY ALLOCATIONS AND RADIO TREATY MATTERS; GENERAL RULES AND REGULATIONS
Subpart N—FCC Procedure for Testing Class A, B and S Emergency Position Indicating Radiobeacons (EPIRBs)
General
§ 2.1501 Introduction.
§ 2.1503 Test environment.
(a) Measurement sites. Radiated emission tests for peak effective radiated power (PERP), spurious emissions and power in the test mode are to be performed on an open field test site as shown in Figure 1. The site is to be located on level ground with an obstruction-free, 60 m by 52 m, elliptical area. The site is to be equipped with an antenna mast capable of adjustment from 1 to 4 m. The center of a metal ground plane at least one wavelength in diameter at 121.5 MHz (2.47 m) is to be located 30 m from the receiving antenna. The ground plane is to have provisions for mounting removable quarter-wave verticle elements to produce a monopole antenna at both 121.5 and 243 MHz with the VSWR of less than 1.5.
Note: It is desirable that the level of radiated ambient EME at the test site be at least 6 dB below the FCC limits applicable to the EPIRB. It is, of course, not always possible to meet this condition. If the ambient field strength at some frequencies within the specified measurement ranges is too high, it is recommended that one or more of the following corrective steps be employed:
(1) Perform measurements in critical frequency bands during hours when broadcast and other radio stations are off-the-air and ambients from industrial equipment are lower.
(2) Insofar as is possible, orient the axis of an open area test site to discriminate against strong ambient signals.
(3) Vary the bandwidth of the measuring instrument to separate ambient EME from emissions from the EPIRB.
(b) Temperature. Except as otherwise noted, the ambient temperature during testing is to be within the range of 4 to 35 °C (40 to 95 °F).
§ 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
§ 2.1507 Test frequencies.
Testing of an EPIRB for compliance outside a shielded room on a distress frequency is prohibited, since this may interfere with emergency communications. Therefore, all compliance testing outside a shielded room should be conducted on one of the pairs of alternate frequencies specified below:
121.600/243.200 MHz 121.650/243.300 MHz 121.700/243.400 MHz 121.750/243.500 MHz 121.800/243.600 MHz 121.850/243.700 MHz 121.900/243.800 MHz
The above frequencies are to be used for limited testing of EPIRBs for compliance with FCC Rules, subject to the following conditions:
(a) The testing shall not cause harmful interference to authorized communications on these frequencies.
(b) The testing shall be coordinated with the nearest FCC district office.
For simplicity, 121.5 MHz and 243 MHz will be used throughout this test procedure to indicate the alternate test frequency.
§ 2.1509 Environmental and duration tests.
The environmental and operational tests in §2.1509 (a) through (e) are to be conducted on a single test unit in the order given below. This sequence of tests also includes the electrical tests in §§2.1511, 2.1513 and 2.1515 of this part. The test unit is not to be adjusted, nor is the battery to be replaced during these tests, and a log of battery on-time should be maintained. The above tests are to be performed on the same test unit. The tests in §2.1509 (f) through (i) may be run in any sequence or may be performed on separate test units.
(a) Vibration test.
Step (1) Secure the EPIRB to the vibration table. The EPIRB is not to be operated and should not activate while being vibrated. Step (2) Subject the EPIRB to sinusoidal motion parallel to one of the three major orthogonal axes under the following conditions: B. The frequency is to be changed either linearly or logarithmically with time between 4 Hz and 33 Hz such that a complete cycle (4 Hz to 33 Hz to 4 Hz) takes approximately 5 minutes. C. The EPIRB is to be vibrated for at least 30 minutes or six complete cycles. Step (3) Remount the EPIRB, if necessary, and repeat step 2 for each of the other two major orthogonal axes. Step (4) Upon completion of the test, perform an exterior mechanical inspection and verify operation by turning the unit on and observing the RF power indicator on the unit or monitoring the transmission with a receiver. Record test results. (b) Thermal shock tests. These tests are to be performed on EPIRBs which are required or intended to float. (1) Low temperature thermal shock test.
Step (1) Place the EPIRB in a temperature chamber for at least 3 hours at −20 °C or colder. The EPIRB is not to be operated while being cooled. Step (2) Immediately place the EPIRB in water that has been maintained at +10 °C or warmer. Step (3) After 15 minutes, perform as exterior mechanical inspection and verify operation by turning the unit on and observing the RF power indicator on the unit or monitoring the transmission with a receiver. Record test results. (2) High temperature thermal shock test.
Step (1) Place the EPIRB in a temperature chamber for at least 3 hours at +55 degrees C or warmer. The EPIRB is not to be operated while being heated. Step (2) Immediately float the EPIRB in water that is maintained at +25 degrees C or colder. Step (3) After 15 minutes, perform an exterior mechanical inspection and verify operation by turning the unit on and observing the RF power indicator on the unit or monitoring the transmission with a receiver. Record test results. (c) Salt fog test.
Step (1) Place the EPIRB in a salt fog chamber for a period of at least 2 hours at a temperature of 35 °C (±2 °C) before exposing it to salt fog. The EPIRB is to be turned off during this test. Step (2) With the chamber temperature maintained at 35 °C, introduce salt fog at the saturation point for 48 hours. The salt fog is to be prepared from a 5% (±1%) salt (sodium chloride solution. For detailed guidance on the preparation of the solution and the apparatus for generating salt fog, refer to MIL-STD-810D (19 July 1983), method 509.2. Step (3) Upon completion of the salt fog exposure, the EPIRB is to be airdried at room temperature for 12 hours and operation verified by turning the unit on and observing the RF power indicator on the unit or monitoring the transmission with a receiver. Record observations. (d) Drop test. This test is to be performed on EPIRB which are required or intended to float.
Step (1) Turn the EPIRB on, log the time and drop it three times into water from a height of 20 meters. The water is to be deep enough so that the EPIRB does not touch bottom when dropped. Each drop should be initiated from a different orientation as follows: antenna vertical up; antenna vertical down; antenna horizontal. Step (2) Upon completion of the drop test, an exterior mechanical inspection is to be performed and operation verified by observing the RF power indicator on the unit or monitoring the transmission with a receiver. Record observations. Turn the test unit off and log the total on-time. (e) Forty-eight hour operational test. This test includes the battery life test and all the electrical tests given in §§2.1511, 2.1513 and 2.1515 of this part, at various temperatures. The tests are to be performed on the same EPIRB in the sequence specified herein. Be sure to record the on-time of the unit during each test. No more than 8 hours of total on-time is permitted before commencing step 4. When operating the EPIRB in the environmental chamber, a non-radiating load may be substituted for the antenna provided it is electrically equivalent to the standard antenna and does not reduce the battery current drain.
Step (1) Perform the radiated emissions test in §2.1511 of this part. Step (2) Perform the modulation characteristic tests in §2.1513 of this part. Step (3) Perform the spectral tests in §2.1515 of this part. Step (4) With the EPIRB off, place unit in an environmental chamber at a temperature of −20 °C for at least 2 hours. Step (5) With the EPIRB in the chamber, repeat the carrier frequency test in §2.1515(d) of this part. (Leave the EPIRB turned on.) Step (6) Near the end of 48 hours of total on-time for the EPIRB, repeat the carrier frequency test in §2.1515(d) of this part. Step (7) At the end of 48 hours of total on-time, remove EPIRB from the chamber and immediately repeat the PERP test for the fundamental emissions in §2.1511(c) of this part. The unit should be maintained at −20 °C to the extent possible for this test. (f) Float free and activation test. This test is required only for Class A EPIRBs.
Step (1) The EPIRB is to be installed in the automatic release mechanism and the assembly is to be mounted on a fixture simulating a deck or bulkhead as per manufacturer' installation instructions. Step (2) Submerge the fixture in water in its normal mounted orientation. The EPIRB must float free before reaching a depth of 4 meters and should automatically activate. Activation is to be verified by observing the RF power indicator on the unit or monitoring the transmission with a receiver. If the EPIRB is equipped with an automatically deployable antenna, the antenna must properly deploy during each immersion. Record observations. (g) Stability and buoyancy test. This test is to be performed on EPIRBs which are required or intended to float. This test is to be conducted in fresh water.
Step (1) With the antenna deployed in its normal operating position, submerge the EPIRB in a horizontal position just below the surface of the water. Step (2) Release the EPIRB and observe the amount of time required for it to come to an upright position. It must reach its upright position within one second from each position. The EPIRB must have a reserve buoyancy of at least 5% of its gross weight. It must also float upright in calm water with the base of the antenna a minimum of 5 cm above the water. Record the time required for the test unit to right itself. (h) Temperature/frequency test. The frequency stability shall be measured over an ambient temperature from −20° to +55 °C at intervals of not more than 10 °C. A period of time sufficient to stabilize all of the components of the oscillator circuit at each temperture level shall be allowed prior to frequency measurement.
Step (1) Place the EPIRB in the environmental test chamber. Step (2) Adjust the temperature in the chamber to +20 °C and allow sufficient time for the oscillator to stabilize at that temperature. Step (3) Measure the carrier frequency in accordance with the procedure in §2.1515(d) of this part. Record the carrier frequency in Hertz. The carrier frequency at +20 °C is the reference for determining the frequency tolerance. Step (4) Increase the temperature in the chamber to +55 °C and allow sufficient time for the oscillator to stabilize at that temperature. Measure the carrier frequency using the procedure in §2.1515(d) of this part. Step (5) Reduce the temperature in the chamber in 10 °C maximum increments until −20 °C is reached. At each new temperature, allow sufficient time for the oscillator to stabilize at that temperature. Measure the temperature and frequency in each case and plot the frequency vs temperature from −20° to +55 °C. (i) Leakage and immersion test.
Step (1) Completely submerge the EPIRB in water for 48 hours. The EPIRB is to be turned off during this test. Step (2) Remove the EPIRB from the water and wipe dry. Step (3) Verify operation by briefly turning the EPIRB on and observing the RF power indicator on the unit or monitoring the transmission with a receiver. Step (4) Open the EPIRB for examination. There is to be no water inside the unit. Record observations. The Commission's Rules require that the peak efficetive radiated power (PERP) of a Class A, B or S EPIRB not be less than 75 mW under certain specified conditions. The PERP of an EPIRB transmitter is determined by comparing its level to a reference PERP generated by a standard quarter-wave monopole antenna located on a one wavelength minimum diameter metal ground plane. The Rules also require that all spurious and harmonic emissions be attenuated by a specified amount with respect to the reference PERP. In addition, there is a limit on the PERP of radiated emissions with the switch in the test mode. These measurements are to be made in accordance with the following procedure. (a) General set-up instructions. Measurements of radiated electromagnetic emissions (EME) are to be performed on the 30 meter open field test site described in §2.1503(a) of this part and on one of the pair of frequencies listed in §2.1507 of this part. A receiver, tuned dipole antennas and a calibrated signal generator as described in §2.1505 of this part are required. The EPIRB should be powered by its own internal battery with its standard antenna attached and deployed. (b) Set-up for radiated EME tests.
Step (1) Place a 121.5 MHz quarter-wave vertical antenna element at the center of the ground plane and connect the output of the calibrated signal generator to the antenna. Step (2) Mount the tuned dipole antenna on the antenna mast, tune the elements to 121.5 MHz and connect the antenna to the receiver. Step (3) After an appropriate warm up, turn the receiver to the frequency of the test unit, set the detector to peak mode and the bandwidth to 100 kHz. (Note: It is sometimes helpful to monitor the receiver audio output with a speaker. The EPIRB signal may be identified by its distinctive modulation.) (c) Radiated EME tests.
Fundamental emissions-peak effective radiated power Step (1) Turn on the signal generator and adjust the output to 75 mW at 121.5 MHz. Step (2) Vary the antenna height from one to four meters in both vertical and horizontal polarization. Record the highest receiver reading in dBm as the reference level. Step (3) Disconnect the signal generator and replace the quarter-wave vertical element on the ground plane with the EPIRB under test. The EPIRB is to be positioned directly on the surface of and in the center of the metal ground plane. Step (4) Activate the EPIRB. Step (5) Vary the receive antenna height from one to four meters in both vertical and horizontal polarization. Record the highest receiver reading in dBm and the instrument settings, antenna height and direction for maximum radiation, antenna polarization and conversion factors, if any, associated with that reading. Step (6) Repeat Step 5 with the EPIRB switch in the test position. Return the switch to the normal operation position. Step (7) Rotate the EPIRB 30 degrees and repeat Steps 5 and 6. Repeat this step for all successive 30 degrees segments of a full, 360 degree rotation of the EPIRB. Step (8) Repeat §2.1511(b) and Steps 1 through 7 for 243 MHz. Step (9) Compute the peak effective radiated power for the maximum level of each measured emission using the following formula: where: dBmmeas is the measured receiver reading in dBm, and dBmref is the reference receiver reading found in step 2 of §2.1511(c). Step (10) Record the PERP in mW. The FCC limit for minimum power in the normal operation mode (i.e., with the EPIRB switch in the normal operating position) is 75 mW. The FCC limit for maximum power in the test mode is 0.0001 mW. Spurious emissions Step (11) Reset the signal generator to operate at 121.5 MHz. Step (12) For each spurious and harmonic emission to be measured, retune the receive antenna to the appropriate frequency and repeat Steps 5 and 7. Step (13) Determine the FCC limit on power for spurious emissions on the frequency of each measured emission as follows: The rules require that spurious emissions be attenuated at least 30 decibels below the transmit power level. Therefore, the maximum received power limit for a spurious emission can be calculated from the formula: dBmspur = dBmmeas+AF121.5−AFspurfreq−30 where: dBmmeas = measured receiver reading (Section 2.1511(c), step 5). AF121.5 = tuned dipole antenna factor at 121.5 MHz. AFspurfreq = tuned dipole antenna factor at spurious freq. Step (14) Record in dB below the fundamental emissions the level of all spurious and harmonic emissions within 10 dB of the FCC limits. (a) Set-up. Test of modulation characteristics are to be performed in an RF shielded room.
Step (1) Place the EPIRB directly on a metal ground plane, such as the shielded room floor. Step (2) Place a suitable receiving antenna at a convenient distance from the EPIRB and connect it to the input of the spectrum analyzer or receiver to observe the radiated signal from the EPIRB. Step (3) Set the spectrum analyzer or receiver controls as follows: I.F. bandwidth: 300 kHz minimum Video filter: OFF or as wide as possible Amplitude scale: Linear Frequency: 121.5 MHz Scan width: 0 Hz Step (4) Connect the detected output of the spectrum analyzer or receiver to the input of the storage oscilloscope. Step (5) Set the oscilloscope controls as necessary to allow the demodulated waveform to be viewed. The input signal is to be DC coupled. (b) Measurement of Audio Frequencies.
Step (1) Activate the EPIRB. Step (2) Trigger the oscilloscope and store at least one complete cycle of the audio waveform. Step (3) Measure the period (T) of the waveform. The period is the time difference between the half voltage points at the beginning and end of one complete cycle of the waveform. See Figure 2. Step (4) Calculate the frequency (F), where: F=1/T. Step (5) Repeat Steps 2 through 4 until the highest and lowest audio frequencies are found. Note: The lowest and highest frequencies may occur several cycles before or after the transition from low to high frequency.)
Step (6) Determine the audio frequency range (Frange), where: Frange=Fhigh−Flow Step (7) Record instrument settings and the lowest and highest audio frequencies. Record the audio frequency range in Hertz. Step (8) Repeat Steps 1–7, above, for 243 MHz. (c) Modulation factor.
Step (1) Activate the EPIRB. Step (2) Trigger the oscilloscope and store at least one complete cycle of the audio waveform. The input signal is to be DC coupled or erroneous results will be obtained. Step (3) Measure the maximum voltage (Vmax), and the minimum voltage (Vmin) for the cycle. The modulation factor (M) is calculated from the following formula: See Figure 2. Step (4) Repeat Steps 2 and 3 until the lowest modulation factor is found. Step (5) Record instrument settings and the lowest modulation factor, expressed as a ratio between 0 and 1. Step (6) Repeat the above measurements for 243 MHz. (d) Modulation duty cycle.
Step (1) Activate the EPIRB. Step (2) Trigger the oscilloscope and store at least one complete cycle of the audio waveform. Step (3) Measure the period (T) of the waveform. The period is the time difference between the half voltage points at the beginning and end of one cycle of the waveform. See Figure 2. Step (4) Measure the pulse width (tp) of the waveform. The pulse width is the time difference between the half voltage points on the rising and falling portions of the waveform. See Figure 2. Step (5) Calculate the duty cycle (D) as follows: Step (6) Repeat Steps 2 through 5 a sufficient number of times to determine the highest and lowest duty cycles. Step (7) Record instrument settings and the highest and lowest duty cycles in percent. Step (8) Repeat Steps 1–7 for 243 MHz. (e) Sweep repetition rate.
Step (1) Connect a speaker to the detected output of the spectrum analyzer or receiver so the audio frequencies are audible. Alternatively, an FM radio tuned to 108 MHz placed in the vicinity of the EPIRB may be used. Step (2) Activate the EPIRB. Step (3) Time the number of audio sweeps (N) for a one minute interval. Step (4) Calculate the audio sweep rate (R) using R=N/60. Step (5) Record instrument settings and the sweep repetition rate in Hertz. (a) Set-up. Spectral measurements are to be performed in a shielded room.
Step (1) Place the EPIRB directly on a metal ground plane, such as the shielded room floor. The EPIRB should be powered by its own internal battery with its standard antenna attached and deployed. Step (2) Place a suitable receiving antenna at a convenient distance from the EPIRB and connect it to the input of the spectrum analyzer to observe the radiated signal from the EPIRB. A signal generator and frequency counter capable of operating at 121.5 and 243 MHz are also required for these tests. (b) Occupied bandwidth test.
Step (1) Activate the EPIRB and observe the fundamental frequency on a spectrum analyzer. Adjust location of receiving antenna and spectrum analyzer controls to obtain a suitable signal level (i.e., a level which will not overload the spectrum analyzer, but is far enough above the noise floor to allow determination of whether or not the sidebands are attenuated by at least the amount required in the rules). Step (2) Set spectrum analyzer controls as follows: I.F. bandwidth: 10 kHz Video filter: OFF or as wide as possible Scan time: 100 ms./div. Amplitude scale: 10 dB/div. Scan width: 20 Hz/div. Center frequency: 121.5 MHz Step (3) Record the signal level in dbm. Step (4) Calculate the mean power reference level by adding 10 log10 (D), where D is the modulation duty cycle determined in section 2.1513(d) of this part, to the recorded signal level. Step (5) Set spectrum analyzer controls as follows: I.F. bandwidth: 100 Hz Video filter: OFF or as wide as possible Scan time: 10 sec./div. Amplitude scale: 10 dB/div. Scan width: 20 kHz/div. Step (6) Check the modulation sidebands for compliance with the required attenuation below the mean power reference level specified in §80.211 of the rules. Step (7) Record how the test was performed, instrument settings and the occupied bandwidth in kHz and the 3 dB bandwidth of the carrier in Hz. (See §2.1517 of this part). Step (8) Repeat Steps 1 through 7 for the signal at 243 MHz. (c) Signal enhancement test. The setup specified in §2.1515(a) is to be used in this method of measuring signal enhancement. Other methods may be used if shown to give results equivalent to or more accurate than this method.
Step (1) Activate the EPIRB and locate the carrier frequency at 121.5 MHz on the spectrum analyzer. Adjust location of receiving antenna and spectrum analyzer controls to obtain a suitable signal level (i.e., a level which will not overload the analyzer, but is far enough above the noise floor to allow sidebands at least 40 dB below the carrier to be viewed). Step (2) Set the spectrum analyzer controls as follows: I.F. bandwidth: 10 kHz Video filter: OFF or as wide as possible Scan time: 100 ms./div. Amplitude scale: 5 dB/div. Scan width: 10 kHz/div. Center frequency: 121.5 MHz Step (3) Record the amplitude in dBm. Step (4) Calculate the total power output by adding 10 log(D), where D is the modulation duty cycle determined in §2.1513(d) of this part, to the recorded signal level. Step (5) Set the spectrum analyzer controls as follows: I.F. bandwidth: 60 Hz or less Video filter: OFF or as wide as possible Scan time: 10 sec./div. Amplitude scale: 5 dB/div. Scan width: 20 Hz/div. Center frequency: 121.5 MHz Step (6) Measure and record the carrier power dBm as displayed on the spectrum analyzer. Step (7) Calculate the ratio of carrier power to total power from Steps 4 and 6 using the following formula: dBC = carrier power in step 6 dBT = total power in step 4 Step (8) Record instrument settings, sample calculation and the percent of power within ±30 Hz at 121.5 MHz or ±60 Hz at 243 MHz of the carrier frequency. Step (9) Repeat the above measurement Steps 1 through 8 for 243 MHz. For the higher frequency, the I.F. bandwidth in step 5 must be 120 Hz or less. (d) Carrier frequency test. The setup specified in §2.1515(a) is to be used in measuring the carrier frequency.
Step (1) Activate the EPIRB and locate the 121.5 MHz signal on the spectrum analyzer. Adjust location of receiving antenna and spectrum analyzer controls to obtain a suitable signal level. Step (2) Set the spectrum analyzer controls as follows: I.F. bandwidth: 100 Hz Video filter: OFF or as wide as possible Scan time: 10 sec./div. Amplitude scale: 10 dB/div. Scan width: 20 Hz/div. Center frequency: 121.5 MHz Step (3) Combine the output of the signal generator with the EPIRB signal at the input to the spectrum analyzer. Step (4) Adjust amplitude and frequency of signal generator output to determine center of carrier frequency component. Step (5) Measure signal generator frequency with frequency counter with accuracy of 5 PPM or better and record as carrier frequency. Step (6) If applicable, change the type of modulation of the EPIRB and record the shift in carrier frequency as observed on the spectrum analyzer display. Step (7) Repeat the above measurement Steps 1 through 6 for 243 MHz. [56 FR 11683, Mar. 20, 1991; 60 FR 47302, Sept. 12, 1995] The test report for an EPIRB shall contain the following information: (a) Specific identification, including the FCC ID, model and serial numbers, of the EPIRB under test. (b) The name and location of the test sites used for the measurements. (c) A description of the instrumentation and equipment, including antennas, used to perform the tests. For purchased equipment, the type, manufacturer and model number are generally sufficient as a description. (d) The test results and associated comparative information. (e) A description of any modifications made to the EUT or other system components during the testing. (f) A description and justification of all deviations from the procedures described herein. (g) The name and qualifications of the person responsible for the tests. (h) The date the tests were performed. (i) A statement signed by the individual responsible for the test that the EPIRB as tested complies or does not comply with the applicable FCC rules. (j) A statement signed by the individual responsible, either directly or indirectly, for production or marketing of the device tested that the unit tested is representative of the equipment that all be marketed. A. Frequency (Hz) Peak amplitude (mm) 4-10 2.5 10-15 0.8 15-25 0.4 25-33 0.2
§ 2.1511 Measurements of radiated emissions.
§ 2.1513 Measurements of modulation characteristics.
§ 2.1515 Spectral measurements.
Data Recording/Reporting Requirements
§ 2.1517 Data recording/reporting requirements.
Figure 1 to Subpart N of Part 2—Measurement Site
Figure 2 to Subpart N of Part 2—Typical Audio Wave
Figure 3 to Subpart N of Part 2—Example of Ideal EPIRB Spectrum
Figure 4 to Subpart N of Part 2—Example of EPIRB Carrier Component
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