Test Report

FCC ID: 2ACTZNXTVE19

Test Report

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Test Report Prepared for: ACSS an L-3 Company Description: Aviation Transponder Model: NXT-800, NXT-700, NXT-600 Serial Number: NXE10990, NXE11035, NXE11055 FCC ID: 2ACTZNXTVE19 To FCC Part 87 Date of Issue: September 6, 2019 On the behalf of the applicant: Aviation Communication and Surveillance Systems 19810 N. 7th Ave. Phoenix, AZ 85027 Attention of: Mark D. Smith 623-445-6643 Mark.D.Smith@L3Harris.com Prepared by Compliance Testing, LLC 1724 S. Nevada Way Mesa, AZ 85204 (480) 926-3100 phone / (480) 926-3598 fax www.compliancetesting.com Project No: p1980010 Poona Saber Project Test Engineer This report may not be reproduced, except in full, without written permission from Compliance Testing. All results contained herein relate only to the sample tested. p1980010_FCC Part 87_Rev 6.0 Page 1 of 18

Test Report Revision History Revision Date Revised By Reason for Revision 1.0 August 30, 2019 Poona Saber Original Document -revisions after Clients remarks - Annex B revised 2.0 September 11, 2019 Poona Saber - Annex D revised - Annex E revised - Annex F revised 3.0 September 19, 2019 Poona Saber Revision made on page 5 serial numbers 4.0 September 19, 2019 Trisha Aguilar Corrected FCC ID Revised Annex F Added radiated spurious table on page 10 Added duty Cycle on page 15 and revised on page 5.0 October 25, 2019 Poona Saber 5 Added environmental conditions on page 5 Added statement of calibration extension to table of test equipment 6.0 October 29, 2019 Poona Saber Changed appendix to annex p1980010_FCC Part 87_Rev 6.0 Page 2 of 18

Table of Contents Description Page Standard Test Conditions Engineering Practices ................................................................................................................... 5 Test Results Summary ............................................................................................................................................................ 7 Carrier Output Power (Conducted) ......................................................................................................................................... 8 Conducted Spurious Emissions .............................................................................................................................................. 9 Radiated Spurious Radiation .................................................................................................................................................. 10 Occupied Bandwidth ............................................................................................................................................................. 11 Emission Masks (Occupied Bandwidth) ................................................................................................................................ 12 Frequency Stability (Temperature Variation) ........................................................................................................................ 13 Frequency Stability (Voltage Variation) ................................................................................................................................. 14 Modulation Characteristics .................................................................................................................................................... 15 Modulation Details ................................................................................................................................................................. 16 Test Equipment Utilized ........................................................................................................................................................ 18 p1980010_FCC Part 87_Rev 6.0 Page 3 of 18

ILAC / A2LA Compliance Testing, LLC, has been accredited in accordance with the recognized International Standard ISO/IEC 17025:2005. This accreditation demonstrates technical competence for a defined scope and the operation of a laboratory quality management system (refer joint ISO-ILAC-IAF Communiqué dated January 2009). The tests results contained within this test report all fall within our scope of accreditation, unless noted in the table below Please refer to http://www.compliancetesting.com/labscope.html for current scope of accreditation. Testing Certificate Number: 2152.01 FCC Site Reg. #349717 IC Site Reg. #2044A-2 Non-accredited tests contained in this report: N/A p1980010_FCC Part 87_Rev 6.0 Page 4 of 18

Standard Test Conditions Engineering Practices Except as noted herein, the following conditions and procedures were observed during the testing: All tests and measurement data shown were performed in accordance with FCC Rules and Regulations, Volume II; Part 2, Sub-part J, Sections 2.947, 2.1033(c), 2.1041, 2.1046, 2.1047, 2.1051, 2.1053, 2.1055, 2.1057 and the following individual Parts: FCC Part 87. Measurement results, unless otherwise noted, are worst-case measurements. Environmental Conditions Temperature Humidity Pressure (ºC) (%) (mbar) 24-25.5 24 -32 956-962 EUT Description Model: NXT-800, NXT-700, NXT-600 Description: NXT Mode-S transponder Serial Number: NXE10990, NXE11035, NXE11055 9008000-10000 (AC/DC power), 9007000-55001 (DC power) and 9006000-55000 (DC power) Additional Information: The NXT Mode-S transponder is a diversity Mode-S transponder which contains data link capabilities in addition to Mode- S specific services. The NXT units will meet the following TSO documents: • TSO-C112d, ATCRBS/mode S airborne Equipment • TSO-C166b, 1090 MHz ADS-B (transmit only) The NXT-800 Transponder consists of two versions, one using a 115 VAC, 400 Hz or +28 VDC power supply and another which supports only a +28VDC power supply. For testing purposes both AC and DC radiated emissions were investigated, and both were almost the same. The Higher one is reported NXT-600 Transponder is designed for a +28 VDC power supply. NXT-700 Transponder is designed for a +28 VDC power supply. NXT-600 and NXT-700 share a common circuit card set for the processor, power supply and transceiver. NXT-700 uses the same cards with only a few minor changes to support its mechanical design. The three units have different form factors, rear connectors and rear interconnect circuit card assemblies hence, radiated testing has been performed on all units and conducted testing only on NXT-800 unit. Following is declared as type of emission for NXT system: • Transponder (Compliant with FAA TSO C112d with deviations): 18M0M1D • Frequency range: 1090 ± 1 MHz • There are two sub-modes operation for 1090 MHz called: ATCRBS reply and Mode S and can be transmitted from both top and bottom antennas. • Transponder system (1090 MHz) uses pulse position modulation combined with pulse width modulation (M1D) • In transponder mode the transmitter transmits to two antenna ports, top and bottom. The top and bottom antennas do not transmit simultaneously. • The maximum duty cycle for transponder ATCRBS transmission is 0.338% and mode S transmission is 0.586% p1980010_FCC Part 87_Rev 6.0 Page 5 of 18

EUT Support Equipment Qty Description Manufacturer Model No. Part No. 1 XPDR RF Simulation Module ACSS - ACSS-001985 1 Mode S generic test Fixture ACSS - ACSS-001969 1 ATC Test Set IFR ATC 1400A 1 Transponder test set IFR SI-1404 1 DC Power Supply Agilent N5746A 1 AC Power Supply Elgar CW1251 1 Oscilloscope Tektronix TDS 3054B 0175 1 Directional Coupler Narda 3003-20 11210 1 Directional coupler Narda 27002SC-40 1 Directional Coupler Werlatone C3910-10 1 10 dB 50 Watts attenuator pasternack NA PE7392-10 2 Dell Computers Dell NA .XPDR RF Simulation Module is comprised of RF generators and attenuators that are controlled by an FPGA card in the test computer. We use this to send interrogations and receive replies from the UUT. .Mode-S Generic Test Fixture is used to control the power applied to the UUT (via DC power supply) as well as providing the UUT with the necessary discrete inputs to facilitate normal operation and test operations. Test Setup with Directional coupler and Support Equipment Directional Unit Under XPDR in Coupler out test fwd Spectrum Analyzer p1980010_FCC Part 87_Rev 6.0 Page 6 of 18

Test Results Summary Pass, Specification Test Name Comments Fail, N/A 2.1046, 87.131 Carrier Output Power (Conducted) Pass 2.1051, Unwanted Emissions (Transmitter Pass 87.139(i)(1) Conducted) 2.1053 Field Strength of Spurious Radiation Pass 2.1049, Emission Masks (Occupied Bandwidth) Pass 87.139(i)(3) The EUT does not contain an 2.1047 Audio Low Pass Filter (Voice Input) N/A audio input The EUT does not contain an 2.1047 Audio Frequency Response N/A audio input The EUT does not contain an 2.1047 Modulation Limiting N/A audio input 2.1047 Modulation Characteristic Pass 2.1055, Frequency Stability (Temperature Pass 87.133(a) Variation) 2.1055, Frequency Stability (Voltage Variation) Pass 87.133(a) p1980010_FCC Part 87_Rev 6.0 Page 7 of 18

Carrier Output Power (Conducted) Engineer: Poona Saber Test Date: 8/23/19 Test Procedure The Equipment Under Test (EUT) was connected through a directional coupler directly to a spectrum analyzer with the RBW > OBW and the VBW set to 3 X RBW which set the RBW greater than the transmit signal ensuring there was no signal suppression while measuring a modulated signal. The peak and Average readings were taken for Transponder system for both ATCRBS(C) and S modes and the result was then compared to the limit. Section 87.131, for Radio navigation equipment Note 7 specifies “Frequency, emission and maximum power will be determined by appropriate standards during the certification process. The Transponder output power is controlled by the requirements of FAA TSO C112d. Test Setup EUT Directional Spectrum Coupler Analyzer Output Power for Transponder System Measured Measured Average Average Frequency Antenna Mode Power Peak Power Peak power power (dBm) (W) (dBm) (W) 1090 MHz Top ATCRBS 58.06 639.73 29.52 0.89 1090 MHz Bottom ATCRBS 58.42 695.02 30.27 1.06 1090 MHz Top S 58.04 636.07 31.73 1.48 1090 MHz Bottom S 58.34 682.33 32.42 1.74 See Annex A for test plots p1980010_FCC Part 87_Rev 6.0 Page 8 of 18

Conducted Spurious Emissions Engineer: Poona Saber Test Date: 8/23/19 Test Procedure The EUT was connected through 3 different directional couplers covering the range from 30MHz- 10GHz with attenuators in line if necessary, to spectrum analyzer to verify that the EUT met the requirements for spurious emissions based on the requirement of FCC part 87.139 (a)(3): When the frequency is removed from the assigned frequency by more than 250 percent of the authorized bandwidth the attenuation for aircraft station transmitters must be at least 40 dB. Test Setup Spectrum EUT Directional Analyzer Coupler Average Spurious Average Frequency Limit Mode Antenna Power Fundamental Power dBc Result (MHz) (dBc) (dBm) (dBm) 1090 MHz Top 4360.36 -27.83 29.52 57.35 ≥40 PASS ATCRBS 1090 MHz Bottom 4360.05 -25.84 30.27 56.11 ≥40 PASS ATCRBS 1090 MHz Top 4359.94 -24.8 31.73 56.53 ≥40 PASS Mode S 1090 MHz Bottom 4359.96 -22.17 32.42 54.59 ≥40 PASS Mode S See Annex B for test results p1980010_FCC Part 87_Rev 6.0 Page 9 of 18

Radiated Spurious Emissions Engineer: Poona Saber Test Date: 8/21/19 Test Procedure The EUT was setup and tested in accordance with ANSI C63.26 2015. Both top and bottom antenna ports are connected into the simulator with matched load. The EUT is placed on non-conductive platform at a height of 0.8 meters above the ground plane of the semi-anechoic chambers for emissions below 1 GHz and at a height of 1.5 meter for emissions above 1 GHz. The test distance from measurement antenna is 3 meters and EUT was rotated 360 degrees and the receive antenna raised and lowered to find the maximum emissions from 30MHz to the 10th harmonic of the fundamental. The EUT was set to the maximum power level allowed and RBW is set to 100 KHz for measurements below 1Ghz and 1Mhz for measurements above 1GHz. A high pass filter was used to notch down the fundamental and radiated measurements are done on NXT-600, NXT-700 and NXT-800 models. The highest emission of both ATCRB and mode S is presented on the plots. Test Setup EUT High pass Antenna Spectrum Filter Analyzer Average Spurious Average Frequency Limit Mode Power Fundamental Power dBc Result (MHz) (dBc) (dBm) (dBm) NXT 600 6540.12 -31.84 29.52 61.36 ≥40 PASS NXT 700 6539.94 -34.88 30.27 65.15 ≥40 PASS NXT 800 6540.14 -21.45 31.73 53.18 ≥40 PASS See Annex C for test results p1980010_FCC Part 87_Rev 6.0 Page 10 of 18

Occupied Bandwidth Engineer: Poona Saber Test Date: 8/22/19 Requirement Based on rule part 2.1049 the occupied Bandwidth is the frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers are each equal to 0.5 % of the total mean power of the given emission. Based on section 87.137 Authorized Bandwidth for Emission designator M1D is 18 MHz. Similarly, operation of the transponder (1090 MHz) system is administered by FAA in accordance with FAA TSO C-112d. Transponder MOPS are provided in RTCA document DO-181E. The allowable -20dB bandwidth is specified in section 2.2.4.2.3 of DO-181E to be less than 46 MHz. Test Procedure The following procedure shall be used for measuring (99 %) power bandwidth The spectrum analyzer center frequency is set to the nominal EUT channel center frequency. The frequency span for the spectrum analyzer shall be set wide enough to capture all modulation products including the emission skirts. The RBW shall be in the range of 1 % to 5 % of the anticipated OBW, and the VBW shall be set ≥ 3 × RBW. Set the detection mode to peak, and the trace mode to max-hold. Test Setup EUT Directional Spectrum Coupler Analyzer See Annex D for Test Results p1980010_FCC Part 87_Rev 6.0 Page 11 of 18

Emission Masks (Occupied Bandwidth) Engineer: Poona Saber Test Date: 8/22/19 Test Procedure The EUT was connected with a directional coupler to a spectrum analyzer to verify that the EUT meets the required emissions mask requirements of part 87.139 (a) (1) & (2) as below. The RBW was set as close as possible to 1%-5% of the occupied bandwidth to ensure accurate readings. a) Except for ELTs and when using single sideband (R3E, H3E, J3E), or frequency modulation (F9) or digital modulation (F9Y) for telemetry or telecommand in the 1435-1525 MHz, 2345-2395 MHz, or 5091-5150 MHz band or digital modulation (G7D) for differential GPS, the mean power of any emissions must be attenuated below the mean power of the transmitter (pY) as follows: (1) When the frequency is removed from the assigned frequency by more than 50 percent up to and including 100 percent of the authorized bandwidth the attenuation must be at least 25 dB; 2) When the frequency is removed from the assigned frequency by more than 100 percent up to and including 250 percent of the authorized bandwidth the attenuation must be at least 35 dB. Test Setup EUT Directional Spectrum Coupler Analyzer See Annex E for Test Results p1980010_FCC Part 87_Rev 6.0 Page 12 of 18

Frequency Stability (Temperature Variation) Engineer: Poona Saber Test Date: 8/26/19 Test Procedure The EUT was placed in an environmental test chamber and the RF output was connected directly to a frequency counter. The temperature was varied from -30ºC to 50ºC in 10ºC increments. After a sufficient time for temperature stabilization the RF output frequency was measured. The frequency tolerance Limit that is used is based on rule part 87.133 (@) band (7) 960 to 1215 MHz which is 20 PPM Test Setup EUT Attenuator Spectrum Analyzer Measurement Results Tuned Frequency Frequency Upper Limit Lower Limit Temperature Measured Upper Lower (Hz) Tolerance (Hz) (Hz) centigrade Frequency Margin Margin ppm (Hz) (Hz) (Hz) 1089975190 20.0 1089996990 1089953390 -30 1089971617 25372.503800 18226.503800 1089996990 1089953390 -20 1089971650 25339.503800 18259.503800 1089996990 1089953390 -10 1089971567 25422.503800 18176.503800 1089996990 1089953390 0 1089971184 25805.503800 17793.503800 1089996990 1089953390 10 1089971534 25455.503800 18143.503800 1089996990 1089953390 20 1089971200 25789.503800 17809.503800 1089996990 1089953390 30 1089971284 25705.503800 17893.503800 1089996990 1089953390 40 1089971634 25355.503800 18243.503800 1089996990 1089953390 50 1089971067 25922.503800 17676.503800 p1980010_FCC Part 87_Rev 6.0 Page 13 of 18

Frequency Stability (Voltage Variation) Engineer: Poona Saber Test Date: 8/26/19 Test Procedure The EUT was placed in a temperature chamber at 20±5°C and connected directly to a spectrum analyzer. The power supply voltage to the EUT was varied from 85% to 115% of the nominal value and the RF output was measured. This was measured with a variable DC voltage source at 14 and 28 Vdc. The frequency tolerance Limit that is used is based on rule part 87.133 (@) band (7) 950 to 1215 MHz which is 20 PPM Test Setup Power EUT Spectrum Supply Analyzer Test Results Tuned Frequency Upper Limit Lower Limit Nominal Voltage Measured Upper Lower Frequency Tolerance (Hz) (Hz) Voltatge Frequency Margin Margin (Hz) ppm (Hz) (Hz) (Hz) 1089975190 20.0 1089996990 1089953390 115.00 97.75 1089975349 21641 21959 1089996990 1089953390 115.00 1089975190 21800 21800 1089996990 1089953390 132.25 1089976602 20388 23212 Tuned Frequency Upper Limit Lower Limit Nominal Voltage Measured Upper Lower Frequency Tolerance (Hz) (Hz) Voltatge Frequency Margin Margin (Hz) ppm (Hz) (Hz) (Hz) 1089975248 20.0 1089996990 1089953390 28.00 23.80 1089975273 21717 21883 1089996990 1089953390 28.00 1089975248 21742 21858 1089996990 1089953390 32.20 1089976476 20514 23086 p1980010_FCC Part 87_Rev 6.0 Page 14 of 18

Modulation Characteristics Section 2.1047 (d) states: “A curve or equivalent data which shows that the equipment will meet the modulation requirements of the rules under which the equipment is to be licensed “ Duty Cycle calculations: ATCRBS Reply Rate Capability The ATCRBS duty cycle comes from the requirement to transmit a minimum of 500 ATCRBS transmissions per second. These are nominally 450ns wide pulses with a maximum of 15 possible pulses per transmission. Duty Cycle = (500 transmissions)*(15 pulses/transmission)*(450ns/pulse)*(100%) = 0.338% Mode S Reply Rate Capability The Mode S duty cycle comes from the capability of the unit to transmit the following: • 34 short Mode S and 16 long Mode S replies per second – • 60 additional long Mode S replies per second for TCAS compatible transponders – • 7 additional long squitters and 1 short squitter per second – • Long Mode S reply/squitter transmits 116 pulses at 500ns each while a short Mode S reply/squitter transmits 60 pulses at 500 ns each. So the total required transmissions is 35 short Mode S transmissions and 83 long Mode S transmissions per second Duty cycle = (35 transmissions)*(60 pulses/transmission)*(500ns/pulse)*(100%) + (83 transmissions)*(116 pulses/transmission)*(500ns/pulse)*(100%) = 0.586% See Annex F for Modulation characteristics screen captures p1980010_FCC Part 87_Rev 6.0 Page 15 of 18

Modulation Details 2 ATCRBS Replies ATCRBS replies are pulse amplitude modulated signals (PAM), and are formed in response to Mode A or Mode C interrogations. Mode A replies consist of a 4096 code which is an identifier and an optional SPI pulse. The Transmitter CCA transmits ATCRBS reply pulse waveforms as shown in Figure 1. F C A C A C A X B D B D B D F 1 1 1 2 2 4 4 1 1 2 2 4 4 2 SPI 4.35 0 1.45 2.9 4.35 5.8 7.25 8.7 10.15 11.6 13.05 14.5 15.95 17.4 18.85 20.3 TIME (µs) Figure 1: ATCRBS Reply The designator of the information pulses and their positions from the first framing pulse are as follows: Table 3: ATCRBS Reply Pulse Characteristics/Position Pulse Position (µsec) FIRST FRAMING PULSE 0.0 C1 1.45 A1 2.90 C2 4.35 A2 5.80 C4 7.25 A4 8.70 X1 10.15 B1 11.60 D1 13.05 B2 14.50 D2 15.95 B4 17.40 D4 18.85 LAST FRAMING PULSE 20.30 SPI 24.65 Note 1: The X pulse is referenced here for possible future use. The ATCRBS Reply Pulse Spacing Tolerance is as follows: • First framing pulse to information/last framing pulse ± 0.1 µsec • Last framing pulse to SPI pulse ± 0.1 µsec • Any 2 pulses in pulse group (except First framing pulse) ± 0.15 µsec The ATCRBS pulse characteristics are as specified in the table below. p1980010_FCC Part 87_Rev 6.0 Page 16 of 18

Table 4: ATCRBS Reply Pulses (in microseconds) Rise Time Decay Time Pulse Designator Pulse Duration Duration Tolerance Min. Max. Min. Max ATCRBS Reply Pulses 0.45 ± 0.10 0.05 0.1 0.05 0.2 3 Mode S Replies Mode S (Short & Long) replies, including preamble, data pulse, pulse shape, pulse spacing tolerance, and delay and jitter characteristics will be as follows. The Transmitter CCA transmits Mode S reply pulse waveforms as shown in Figure 2. PREAMBLE DATA BLOCK 8.0 µs 56 OR 112 µs BIT BIT 1 BIT 2 BIT 3 BIT 4 N-1 BIT N P P P P 1 2 3 4 1 0 1 0 1 0 1 0 1 0 1 0 0.0 0.5 1.0 3.5 4.5 8.0 9.0 TIME (µs) DATA BLOCK EXAMPLE: 0 0 1 0 0 0 1 Figure 2: Mode S Reply 1. Mode S Reply a. The Mode S preamble consists of four 0.5 ± 0.05 microsecond pulses. b. The second, third and fourth pulses are spaced 1.0, 3.5, and 4.5 microseconds respectively from the first transmitted pulse. c. The block of reply data pulses begins 8.0 microseconds after the first transmitted pulse and is either 56 or 112 one microsecond intervals depending on the type of Mode S Reply. d. A pulse with a width of 0.5 ± 0.05 microseconds is transmitted either in the first (data bit “1”) or in the second half (data bit “0”) of each interval. Also, if a pulse transmitted in the second half of one interval is followed by a pulse transmitted in the first half of the next interval, the two pulses merge. Once the merging occurs, a 1.0 ± 0.05 microsecond pulse is transmitted 2. Mode S Reply Pulse Shape a. The pulse rise and decay time are as specified in the table below. Table 5: Mode S Reply Pulses (in microseconds) Rise Time Decay Time Pulse Designator Min. Max. Min. Max Mode S Reply Pulses 0.05 0.1 0.05 0.2 3. Mode S Reply Pulse Spacing Tolerance a. Mode S Reply pulses start at a defined multiple of 0.5 microseconds from the first transmitted pulse. b. The pulse position tolerance must be ± 0.05 microseconds, measured from the first pulse of the reply. p1980010_FCC Part 87_Rev 6.0 Page 17 of 18

Test Equipment Utilized Last Cal Cal Due Description Manufacturer Model # CT Asset # Date Date Horn Antenna ARA DRG-118/A i00271 6/16/18 6/16/20 Bi-Log Antenna Chase CBL6111C i00267 3/8/18 3/8/20 EMI Analyzer Agilent E7405A i00379 1/16/19 1/16/20 3 Meter Semi-Anechoic 3 Meter Semi-Anechoic Panashield i00428 8/15/16 8/15/19 * Chamber Chamber PSA Spectrum Analyzer Agilent E4445A i00471 10/16/18 10/16/19 Rohde & Spectrum Analyzer FSU26 i00501 4/2/19 4/2/20 Schwarz Preamplifier for 1-18GHz AFS44 00101 400 23-10P- Miteq i00509 N/A N/A horn antenna 44 Temperature Test Functional Functional Thermotron SE-1000-3-3 i00557 Chamber Verification Verification Hydra Data Bucket Fluke 2635A I00343 5/15/19 5/15/20 Network Analyzer HP 8722D I00521 7/24/19 7/24/20 • Calibration extension by lab’s manager In addition to the above listed equipment standard RF connectors and cables were utilized in the testing of the described equipment. Prior to testing these components were tested to verify proper operation. END OF TEST REPORT p1980010_FCC Part 87_Rev 6.0 Page 18 of 18


Document Created: 2019-10-29 11:23:55
Document Modified: 2019-10-29 11:23:55
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