Exhibit L Operational Description

FCC ID: AJK6225132-001

Operational Description

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FCCID_554130

WRT-701X Exhibit L – Product Operational Description CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-1

WRT-701X Exhibit L – WRT-701X Product Operational Description TABLE OF CONTENTS L-1. System Overview ............................................................................................................................. 4 L-2. System Components........................................................................................................................ 5 L-3. Aircraft Installation............................................................................................................................ 7 L-4. Operation of Controls ....................................................................................................................... 8 L-5. Equipment Specifications............................................................................................................... 10 L-6. Receiver-Transmitter...................................................................................................................... 12 L-7. Source (A50) .................................................................................................................................. 14 L-8. RF Module (A51)............................................................................................................................ 18 L-9. Second IF Module (A8) .................................................................................................................. 18 L-10. Sampler Card (A31) ....................................................................................................................... 18 L-11. DSP Card (A32) ............................................................................................................................. 18 L-12. CPU Card (A34) ............................................................................................................................. 19 L-13. I/O Card (A33) ................................................................................................................................ 19 L-14. Low Voltage Power Supply (A2) .................................................................................................... 19 L-15. Rear Interconnect Module (A1) ...................................................................................................... 20 L-16. Front Panel..................................................................................................................................... 20 L-17. WRT-701X Oscillators and Critical Frequencies............................................................................ 20 L-18. Technical Report - Name and Address (Section 2.1033 (c) (1)) .................................................. 21 L-19. FCC Identifier (Section 2.1033 (c) (2))........................................................................................... 21 L-20. Installation and Operation Manuals (Section 2.1033 (c) (3)) ........................................................ 21 L-21. WRT-701X Emission Type is 12M5P0N ........................................................................................ 21 L-22. Frequency Range (Section 2.1033 (c) (5)) .................................................................................... 22 L-23. Range of Operating Power Values (Section 2.1033 (c) (6)) .......................................................... 23 L-24. Maximum Power Rating as Defined in Part 87 .............................................................................. 23 L-25. DC Voltages and Currents (Section 2.1033 (c) (8))....................................................................... 23 L-26. Tune Up Procedures (Section 2.1033 (c) (9))................................................................................ 23 L-27. Schematics and Circuit Diagrams (Section 2.1033 (c) (10)).......................................................... 23 L-28. Nameplate Label Drawings (Section 2.1033 (c) (11)).................................................................... 23 L-29. Equipment Photographs: External Views (Section 2.1033 (c) (12)) .............................................. 23 L-30. Equipment Photographs: Internal Views (Section 2.1033 (c) (12)) ............................................... 23 L-31. Digital Modulation System (Section 2.1033 (c) (13)) ..................................................................... 23 L-32. Required Measurements (Section 2.1033 (c) (14)) ....................................................................... 23 CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-2

WRT-701X LIST OF FIGURES Figure L-1. WRT-701X System Components ........................................................................................... L-6 Figure L-2. Typical WXR-701X Aircraft Installation................................................................................... L-7 Figure L-3. WCP-702 Dual Control Panel................................................................................................. L-8 Figure L-4. WRT-701X Receiver-Transmitter Simplified Block Diagram ................................................ L-12 Figure L-5. WRT-701X RF Section Block Diagram ................................................................................ L-13 Figure L-6. Source Module (A3A1) ......................................................................................................... L-14 LIST OF TABLES Table L-1. DDS Source Frequencies ............................................................................................ 16 Table L-2. WRT-701X Oscillators and Critical Frequencies ......................................................... 20 Table L-3. WRT-701X Channel Frequencies (Mhz)..................................................................... 22 CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-3

WRT-701X L-1. System Overview The WRT-701X Wiindshear Weather Radar Receiver/Transmitter with the RF module upgrade is an updated version of the Rockwell Collins WRT-701X Air Transport Weather Radar that has been in commercial service for over 10 years. The RF Upgrade to the WRT-701X is a complete redesign of the RF generation and amplification within the WRT. The WRT-701X Weather Radar System is an all solid-state, color radar system that operates in the X band frequency range. The WRT-701X is capable of Weather detection out to 320 nautical miles, Ground Mapping, Turbulence detection and Forward-Looking Windshear detection. The weather radar system scans a region ahead of the aircraft to detect weather targets that would pose a threat to the aircraft, or inconvenience to the passengers. The WRT-701X uses a radar beam to detect precipitation, and processes the return signal to determine variations in the velocity of detected precipitation to determine turbulence. Additionally, in landing and takeoff situations the information is processed to detect Windshear events. The Windshear Detection feature automatically activates during the takeoff and landing phases of flight to scan the region ahead of the aircraft for microburst windshear hazards. If a windshear event is detected, the radar provides both Aural and Visual warning alerts to the flight crew. This feature can provide up to 60 seconds of advanced warning of a windshear encounter enabling the flight crew to either reject a takeoff or execute a go-around on approach to avoid the windshear hazard. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-4

WRT-701X L-2. System Components The WXR-701X system consists of the following components: Equipment Part Number Description WRT-701X 622-5132-6x4 Receiver/Transmitter WMA-701X 622-5135-8xx (Single) Antenna Pedestal WMA-702X 622-5136-8xx (Dual) WFA-701 X 622-6137-601 Antenna Flatplate WCP-701 622-5129-8xx (Single) Control Panel WCP-702 622-5130-8xx (Dual) CPN 815-8720-001 Rev A Rockwell Collins - Proprietary Information Page L-5

WRT-701X WFA-701X Flatplate Antenna WRT-701X Receiver / Transmitter WMA-701X Antenna Pedestal WCP-701 Control Panel Figure L-1. WRT-701X System Components CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-6

WRT-701X L-3. Aircraft Installation The following figure illustrates a typical aircraft installation. The WRT-701X Receiver-Transmitter is the heart of the radar system. The Receiver/Transmitter produces transmitted output pulses which are radiated through the antenna, it receives and processes the resulting return signals from weather and ground targets and provides a serial digital bus output used to generate a cockpit display of weather and ground targets. The WRT-701X provides antenna elevation and scan commands to the antenna pedestal, receives and processes the control signals from the cockpit control panels and provides all interfaces to other aircraft systems. The WRT-701X utilizes multiple sources of aircraft data including Air Data, Aircraft Attitude, Radio Altitude, and numerous discrete inputs. The radar display for the flight crew is generally the Electronic Flight Instruments (EFIS) NAV display. A stand-alone radar indicator is utilized in some older installations. Range selection of the radar display is generally controlled from the EFIS NAV display control panel or radar indicator if installed. RADAR CONTROL UNITS WCP-701 429 429 453 DISPLAY CONTROL CONTROL BUS 453 DISPLAY BUS BUS BUS AUDIO INHIBIT INPUT AUDIO (FROM RWS) PROG PINS AUDIO INHIBIT OUTPUT (TO GPWS) RADOME ANTENNA PEDESTAL FLATPLATE AURAL ANTENNA ANNUNCIATOR SCAN-ELEV DRIVE SCAN-ELEV FEEDBK WRT-701X Tx-Rx RF FEED RECEIVER/ WARN ANNUNCIATOR TRANSMITTER UNIT CAUTION ANNUNCIATOR 115 VAC (SW) WINDSHEAR FAIL ANNUNCIATOR WFA-701X WMA-701X SIDE SIDESIDE SIDE SIDE SIDE #1 #2 #1 #2 #1 #2 RADIO QUALIFIER A GEAR AIR- 115 VAC ALTIMETER DISCRETES DOWN GRND 400 HZ POWER AUTO INPUT TURN-ON TAS QUALIFIER B AIRCRAFT ARINC 429 (FROM TAS DISCRETES ATTITUDE GROUND COMPUTER) SPEED DRIFT ANGLE Figure L-2. Typical WXR-701X Aircraft Installation CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-7

WRT-701X L-4. Operation of Controls The WRT-701X is a full function weather radar system intended for air transport category aircraft. The figure below illustrates a typical dual control panel. Figure L-3. WCP-702 Dual Control Panel The following paragraphs describe the various operating modes. S1/2 (Dual Control Only) This switch selects between System 1 and System 2 in a dual installation. The button is an alternate action latching design. The out position selects System 1, the depressed position selects System 2. (Note: Primary power is applied to the system through the EFIS “WXR” button on the EFIS control panel) TEST The TEST button is used to activate a Self TEST of the radar system. When TEST is selected, both sides are in test. During non-windshear operation, a full self test will be performed including a test pattern on the display, test of the aural and visual windshear alerts as well as the windshear fail indication. At the conclusion of the test sequence, the tilt value displayed will indicate any faults of external data sources required for windshear operation. A list of tilt codes representing external faults is provided in the equipment installation manual. Radar LRU faults are displayed in the normal locations on the display. If TEST is selected while the windshear qualifiers are active, the system will continue operating in windshear mode. The system will perform a “silent” self test with a test pattern being displayed but no aural or visual windshear annunciations. If the qualifiers become active during the test sequence, the system will enter windshear mode canceling the full test sequence and reverting to the “silent” test described above. MODE Selections Four mode selections are available for the both Captain’s and First Officers positions. These are TFR, WX, WX+T and MAP. These are latching buttons such that pressing one releases any other that had been selected. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-8

WRT-701X TFR (Transfer) The TFR button allows the Captain or First Officer to select all of the control settings from the opposite side. Therefore, if the First Officer presses the TFR button, the First Officer’s radar control settings and display will be slaved to the Captain’s settings. Conversely, if the Captain presses the TFR button, all control settings and display will be slaved to the First Officer’s side. This function works for both AUTO and Manual modes of operation. During Manual operation, the TFR includes slaving of the TILT value selected on the opposite side. WX Weather Mode enables display of weather targets without turbulence information. If GCS is enabled, the Weather display will be essentially free of ground clutter enabling rapid and accurate interpretation of weather hazards. Path Attenuation Compensation (PAC) and PAC Alert features are active to provide compensation for attenuation due to intervening rainfall and to alert the crew when the compensation limits have been exceeded. WX_T Weather Plus Turbulence Mode enables display of weather targets with turbulence information overlaid on the display. Turbulence will be displayed out to 40 nautical miles for all selected ranges. If GCS is enabled, the Weather plus Turbulence display will be essentially free of ground clutter enabling rapid and accurate interpretation of weather hazards. Path Attenuation Compensation (PAC) and PAC Alert features are active to provide compensation for attenuation due to intervening rainfall and to alert the crew when the compensation limits have been exceeded. MAP Map mode enables display of all radar echoes including terrain and weather information. The STC range correction is adjusted for terrain characteristics instead of weather. This mode enables identification of terrain features such as mountains, coastlines, bodies of water etc. No turbulence information is displayed. PAC and PAC Alert are not active in MAP mode. TILT The TILT control allows the flight crew to adjust the antenna tilt for the best display. Each side, the Captain and First Officer may independently adjust the tilt controls. GAIN The GAIN control allows manual adjustment of the radar sensitivity for more detailed assessment of weather conditions. The Calibrated (CAL) position, sets the radar sensitivity to the standard calibrated reflectivity levels and is the recommended position for normal operation. If desired, the radar GAIN may be adjusted to increase sensitivity by rotating clockwise from CAL or the sensitivity may be decreased by rotating counterclockwise from CAL. The GAIN control settings and the corresponding sensitivity changes are contained in the following table. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-9

WRT-701X L-5. Equipment Specifications Characteristic Specification FAA TSO -C63c Size 8MCU Weight Less than 30 lb. Power Requirement 115 V ac, 400 Hz Less than 5 amps Transmitted Output Power 150 Watts (+51.8dBm) nominal Frequency X-band, 9327.424 MHz - 9348.568 MHz ± 2 MHz Channels 64 Channels, 187.5KHz Spacing Pulse Length 2.5, 5.0, 10, 20.0 microseconds Pulse Repetition Rate 3000 pulses per second in Windshear mode. 1280 pulses per second in short range 360 pulses per second in medium range 240 pulses per second in long range Duty Factor 0.06 Receiver IF Bandwidths 10 MHz, 1MHz, First IF Center Frequency 166.765 MHz Second IF Center Frequency 13.9 MHz MDS: –124 dBm nominal STC (Dynamic) optimized for range and pulse width Environmental DO-160D Category Temperature/Altitude Cat A2 -15ºC to +70ºC Operating, 15,000 ft. Temperature Variation Cat B - Vary from -15ºC to +70ºC @5ºC rate Humidity Cat A – 48 Hours Non Operating Shock Cat B - Operational, Crash safety Vibration Cat S – Random Curve C, 1hr per axis, 4.12 grms Explosion N/A Waterproofness N/A Fluid Susceptability N/A Sand and Dust N/A Fungus Resistance N/A Salt Spray N/A Magnetic Effect Cat A– 0.3 to 1.0 meters for 1 degree deflection Power Input Cat E Voltage Spike Cat A – 600 Volt Peak Audio Frequency Susceptibility Cat E –AC input power Induced Susceptibility Cat C – Interference free operation Radio Frequency Susceptibility Cat R Electromagnetic Interference Cat M – Power Lines/Intct Cable-2MHz-6GHz, . Lightning Induced Transient Susceptibility Cat E3 CPN 815-8720-001 Rev A Rockwell Collins - Proprietary Information Page L-10

WRT-701X Characteristic Specification Lightning Direct Effects Boeing D6-16050-4C Multiple Burst, Single Stroke Icing N/A Electrostatic Discharge Cat A Cooling Forced Air per Arinc 600 or Fan in R/T Mount Antenna Flatplate Phased Array, 28 Inches Wide X 26.5 Inches, High Half-height waveguide broadside radiators, Milled / Beamwidth Brazed Construction Gain 3.85 º 34.5 dB Data Bus Format Display Data output ARINC 453 Control data input ARINC 429 External data inputs ARINC 429 Stabilization Digital High speed ARINC 429 Analog 3-wire synchro Selectable Modes TEST (test) MAP (ground mapping) WX (normal weather) WX+T (weather with turbulence detection) TURB (turbulence only) Special Features GCS (ground clutter suppression) TFR (Transfer control to opposite side) PAC (Path Attenuation Compensation) Gain Control Variable above and below CAL CAL – Calibrated, Above CAL +4, +8, +16 dB Below CAL -2,-4, -6, -8, -12, -14 dB Tilt Control -15 to +15 degrees. Selectable Ranges (nmi) 5 to 320 nmi in 5 nmi increments (Aircraft Configuration Dependent) CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-11

WRT-701X L-6. Receiver-Transmitter The WRT-701X Receiver/Transmitter design includes a RF module, a Source module, a Sampler and a Digital Signal Processor (DSP) to implement Windshear capability. The frequency source module is based on a Direct Digital Synthesis (DDS) design which enables the selection of 64 channels. The Sampler and DSP are to provide additional computational throughput needed for the advanced Windshear algorithms. Figure L-4 is a simplified block diagram showing the relationship of the various modules within the R/T unit. New modules for the WRT-701X RF upgrade are outlined in bold red. The remainder of the modules are identical to the standard WRT-701X which has been in airline service for over 10 years. The RF Section is outlined in blue. Figures L-4, L-5, and L-6 will be used for the following discussion of module functions. 1st IF OUTPUT SECOND IF RCVR - I New (A8) RCVR - Q Modules for SAMPLER DSP WRT-701X 2nd 3rd STC RF Upgrade LO LO A31 A32 AGC 1st LO TUNING RF Module Source COMMANDS 453 DISPLAY BUSES A51 Module TX TRIGGERS ANTENNA (A50) FEED TX ANTENNA INTERFACES CHANNEL CONTROL POWER MONITOR PROCESSOR DIGITAL ATTITUDE INPUTS (A34) CONTROL BUSES RF Section DIGITAL AIR DATA INPUTS HAZARD BUS W/S AUDIO OUTPUTS W/S WARN-CAUTION DIG ATTITUDE INPUT / OUTPUT W/S FAIL (INOP) CARD BITE P/S QUALIFIER INPUTS LOW VOLTAGE 115VAC KEEP-ALIVE (A33) POWER SUPPLY BITE P/S AUTO-ON AIRCRAFT DISCRETE INPUTS (A2) (A53) ANALOG PROG HAZARD BUS RADIO PINS 115VAC 115VAC 28VDC ON/ R/T ALTITUDE 400 HZ 400 HZ SWTCH OFF ENABLE SWTCH Figure L-4. WRT-701X Receiver-Transmitter Simplified Block Diagram CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-12

WRT-701X RF Block Diagram WRT-701X RF Upgrade R/T Driver A3 DDS Source A3A1 Rcvr 1st LO 90.425144 764+0.5 MHz Tx RF Drvr MHz Rcv 2nd LO +12Vdc Gnd -12Vdc Trig Bias Trig Ref Clock 153.0 MHz Prepulse trig Rcv 3rd LO Freq Cont A 13.91 MHz RF Upgrade R/T Freq Cont B Module Pw r Mon Osc Cont 499-509 mV @50 dBm 300-335 mV @47 dBm Driver Ref 777.9+0.5 MHz Filter Bd. Modulator 9327 - 9348 MHz Ckt Waveguide G= -0.35 dB max. Filter ? -1.5 dBm x12 Pulse Ckt P.A. ? 9340 + 20 MHz 120W,51.79 dBmmin. 200W,53.01 dBmmax. Noise_Trig Lim_Bias_Trig Noise LNA Limiter Diode G= -0.60 dB max. Mixer Rcvr Mixer 764 MHz x12 - + 2 3 +13 dBm AGC 1st. IF 2nd. IF A8 STC 167 MHz I + 2 - Q Rcv 2nd LO 152.8 MHz 10.5+1.0 dBm Rcv 3rd LO 13.89 MHz 5.0+2.0 dBm Figure L-5. WRT-701X RF Section Block Diagram CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-13

WRT-701X L-7. Source (A50) The Source Module (A50) is the primary frequency generating assembly within the Receiver/Transmitter unit. It provides the following outputs. Transmit Channel output to the Driver 777.28 MHz - 779.04 MHz, st RCVR 1 LO Drive 763.37 MHz - 765.13 MHz nd RCVR 2 LO Drive 153.02 MHz rd RCVR 3 LO Drive 13.9 MHz st The Transmit Channel output and Receiver 1 LO output are later multiplied by 12 for the on-channel transmit / receive functions. The Source module also contains a PIC 16F873 microcontroller to control the DDS frequency selections. OSC X2 X4 Rcvr 1st LO Drive 90.42 MHZ 180.85 MHZ 723.40 MHZ 763.37 MHZ 763 - 779.0 765.13 MHZ MHZ R/T CHANNEL Splitter Tx Drive R/T Switch 777.28 MHZ 779.04 MHZ DDS 2 41.35 MHZ RT 40.707 MHZ SWITCH - 41.691 MHZ 2ND L.O 153.02 MHZ DDS 1 DIVIDE BY 2 3RD L.O. 13.9 MHZ 27.8 MHZ 13.9 MHZ PIC Processor Serial Tuning 160 MHZ Commands from PIC 16F873 XTAL OSC A31 Sampler Decoding and frequency Determining Software Prepulse from Prepulse A31 Sampler Figure L-6. Source Module (A50) CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-14

WRT-701X The Source Module contains three elements that determine the frequency of operation. A 90.42. MHz crystal oscillator, a Direct Digital Synthesizer (DDS 1) tuned to a fixed 27.8 MHz and a second DDS 2 with variable output frequencies between 40.707 MHz and 41.691 MHz depending on the operating channel. The second DDS will be referred to as the ‘41 MHz DDS’ for ease of discussion recognizing that it’s frequency changes with channel. The 90.42 MHz oscillator is multiplied by two to get 180.85 MHz, which is used as a clock for the DDS ICs. One of the DDS IC outputs is 27.8 MHz and is mixed with the 180.85 MHz to produce 153.02 MHz nd rd for the 2 LO. The 27.8 MHz signal is divided by two to produce the 13.9 MHz 3 LO. The 180.85 MHz is multiplied by four to produce 723.40 MHz. When the R/T is in the receive mode the 723.40 MHz is mixed st with the output of the second DDS output at 41MHz to produce the 764Mhz, the 1 LO frequency. The 13.9 MHz is mixed with the 41MHz to produce 55MHz, which when the R/T is in transmit is mixed with the 723.40 MHz to produce the 777MHz transmit channel frequency. (Note: The 777 MHz transmit channel frequency is subsequently multiplied by twelve by the Multiplier module to achieve the 9.33GHz transmit output frequency.) The output frequency range is 763.37 MHz - 765.13 MHz in Receive mode and 777.28 MHz - 779.04 MHz in Transmit mode. The transmitter frequency is controlled by a tuning word sent serially from the A31 Sampler to the PIC processor located within the Source module. The PIC processor is a single chip micro-controller which receives tuning commands from the A31 Sampler, then sends the appropriate hexadecimal tuning commands to the DDS chips via the serial connection between the PIC and the DDSs. The PIC nd processor contains an on-chip 16MHz oscillator used for a clock. The 27MHz DDS output, the 2 LO, rd and 3 LO do not change frequency with channel number and are constant. The following table contains the DDS Frequencies and channel assignments. It should be noted that the Tx Drive output of the Source module is multiplied by 12 later in the transmit chain to produce the 9327.42 MHz - 9348.56 MHz transmitter output frequency. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-15

WRT-701X Table L-1. DDS Source Frequencies DDS Source Frequencies Crystal Oscillator 90425144 Crystal times 2 180850288 Crystal times 8 723401152 CHAN 26, 47, 55 & 63 CHANNEL 62 27MHz DDS 27824659.6923078 27823121.2307752 27821582.7692310 3rd LO 13912329.8461539 13911560.62 13910791.38462 2nd LO 153025628.3076920 153027166.77 153028705.23077 1st IF 166947958.1538470 166938727.38 166929496.61539 2nd IF 13922329.8461545 13911560.62 13900791.38462 DDS CH 42MHz Freq. 55MHZ Freq. REC Freq. (÷12) 1st LO TX Freq. (÷12) TX Freq (Hz) (Hz) (Hz) (Hz) (Hz) (Hz) 0 39971892 53884222 763373044 9160476528 777285374 9327424486 1 39987517 53899847 763388669 9160664028 777300999 9327611986 2 40003142 53915472 763404294 9160851528 777316624 9327799486 3 40018767 53931097 763419919 9161039028 777332249 9327986986 4 40034392 53946722 763435544 9161226528 777347874 9328174486 5 40050017 53962347 763451169 9161414028 777363499 9328361986 6 40065642 53977972 763466794 9161601528 777379124 9328549486 7 40081267 53993597 763482419 9161789028 777394749 9328736986 8 40096892 54009222 763498044 9161976528 777410374 9328924486 9 40112517 54024847 763513669 9162164028 777425999 9329111986 10 40128142 54040472 763529294 9162351528 777441624 9329299486 11 40143767 54056097 763544919 9162539028 777457249 9329486986 12 40159392 54071722 763560544 9162726528 777472874 9329674486 13 40175017 54087347 763576169 9162914028 777488499 9329861986 14 40190642 54102972 763591794 9163101528 777504124 9330049486 15 40206267 54118597 763607419 9163289028 777519749 9330236986 16 40221892 54134222 763623044 9163476528 777535374 9330424486 17 40237517 54149847 763638669 9163664028 777550999 9330611986 18 40253142 54165472 763654294 9163851528 777566624 9330799486 19 40268767 54181097 763669919 9164039028 777582249 9330986986 20 40284392 54196722 763685544 9164226528 777597874 9331174486 21 40300017 54212347 763701169 9164414028 777613499 9331361986 22 40315642 54227972 763716794 9164601528 777629124 9331549486 23 40331267 54243597 763732419 9164789028 777644749 9331736986 24 40346892 54259222 763748044 9164976528 777660374 9331924486 25 40362517 54274847 763763669 9165164028 777675999 9332111986 26 40378142 54289703 763779294 9165351528 777690855 9332290255 CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-16

WRT-701X (Hz) (Hz) (Hz) (Hz) (Hz) (Hz) 27 40393767 54306097 763794919 9165539028 777707249 9332486986 28 40409392 54321722 763810544 9165726528 777722874 9332674486 29 40425017 54337347 763826169 9165914028 777738499 9332861986 30 40440642 54352972 763841794 9166101528 777754124 9333049486 31 40456267 54368597 763857419 9166289028 777769749 9333236986 32 40471892 54384222 763873044 9166476528 777785374 9333424486 33 40487517 54399847 763888669 9166664028 777800999 9333611986 34 40503142 54415472 763904294 9166851528 777816624 9333799486 35 40518767 54431097 763919919 9167039028 777832249 9333986986 36 40534392 54446722 763935544 9167226528 777847874 9334174486 37 40550017 54462347 763951169 9167414028 777863499 9334361986 38 40565642 54477972 763966794 9167601528 777879124 9334549486 39 40581267 54493597 763982419 9167789028 777894749 9334736986 40 40596892 54509222 763998044 9167976528 777910374 9334924486 41 40612517 54524847 764013669 9168164028 777925999 9335111986 42 40628142 54540472 764029294 9168351528 777941624 9335299486 43 40643767 54556097 764044919 9168539028 777957249 9335486986 44 40659392 54571722 764060544 9168726528 777972874 9335674486 45 40675017 54587347 764076169 9168914028 777988499 9335861986 46 40690642 54602972 764091794 9169101528 778004124 9336049486 47 40707036 54618597 764108188 9169298256 778019749 9336236983 48 40721892 54634222 764123044 9169476528 778035374 9336424486 49 40737517 54649847 764138669 9169664028 778050999 9336611986 50 40753142 54665472 764154294 9169851528 778066624 9336799486 51 40768767 54681097 764169919 9170039028 778082249 9336986986 52 40784392 54696722 764185544 9170226528 778097874 9337174486 53 40800017 54712347 764201169 9170414028 778113499 9337361986 54 40815642 54727972 764216794 9170601528 778129124 9337549486 55 40832036 54743597 764233188 9170798256 778144749 9337736983 56 40846892 54759222 764248044 9170976528 778160374 9337924486 57 40862517 54774847 764263669 9171164028 778175999 9338111986 58 40878142 54790472 764279294 9171351528 778191624 9338299486 59 40893767 54806097 764294919 9171539028 778207249 9338486986 60 40909392 54821722 764310544 9171726528 778222874 9338674486 61 40925017 54837347 764326169 9171914028 778238499 9338861986 62 41743283.24 55654075 765144435.2 9181733223 779055227 9348662720 63 41734681.85 55646242 765135833.8 9181630006 779047394 9348568734 CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-17

WRT-701X L-8. RF Module (A51) The RF Module consist of a 130W Transmitter and a low noise receiver connected through a circulator duplexer to a common antenna port. The complete Transmitter is built from solid state components. The transmitter section is comprised of the Tx multiplier, the input microstrip splitter, the 4:1 combiner, the four 35W modules, the 40dB coupler with a power monitor section, a duplexer, termination and the WG output. The coaxial input of the Tx multiplier is the input for the transmitter section. The input splitter is a passive power divider constructed from microstrip elements. The interface between the splitter and the multiplier is coaxial connection. The interfaces among the splitter and the four 35W modules are GPO push-on connections. The upper two 35W modules are combined using a planar microstrip structure. By symmetry, the lower 35W modules are combined in a similar fashion. The top and bottom pairs are, in turn combined using a 2:1 waveguide combiner. The assembly that comprises the two planar and one waveguide combiners is called the 4:1 combiner. The waveguide output of the 4:1 combiner is fed through a waveguide section, upon which a 40dB coupler and power monitor circuit are attached to monitor the strength of the output signal. The receiver is built as a hybrid assembly with WR-90 waveguide input and coaxial cable output. It consists of WR-90 waveguide-to-coaxial transition with built- in noise diode assembly for BITE. This stage is realized in SMT using readily available packaged MMIC gain blocks and a PIN-diode attenuator. IF filtering is a critical element for signal processing. A PIN attenuator is used for temperature compensation in an open loop configuration with LM50 temperature sensor and OP-AMP circuitry for adjustment and offset. The IF mixer is a Surface Mount Device as well. The IF board is located in a separate housing and is attached to the LNA via GPO interface. L-9. Second IF Module (A8) The Second IF (A8) contains an amplifier, Mixer, 13.9MHz Gain Stages, AGC and STC gain control inputs and a Quadrature Detector. st The 166.8 MHz received signal from the 1 IF is filtered and applied to a mixer amplifier in the Second IF. nd This signal is mixed with the 152.87MH 2 LO signal from the Source Module (A3A1). The resulting 13.9MHz third IF signal is amplified and passed through AGC and STC controlled gain stages. The Automatic Gain Control (AGC) is controlled to set the noise floor of the receiver. The Sensitivity Time Control (STC) is a fast bin-to-bin gain control function to maintain the return signal at a normalized level 10 dB below saturation. The AGC and STC functions are controlled by the Sampler (A31). The amplified 13.9 MHz Second IF signal is power divided into two signals that are mixed with a third local oscillator (Third LO) signal, developed by Source (A3A1) to produce the I (In phase) and Q (Quadrature phase) RETURN signals. The I and Q signals are applied to the Sampler (A31). L-10. Sampler Card (A31) The sampler card A31 commands and controls the receive and transmit functions within the receiver- transmitter. A digital signal processor (DSP) is used to control transmitter timing, and receiver normalizer (bin-to-bin AGC). In addition the sampler circuit card contains the analog to digital converters that process the I and Q returns. L-11. DSP Card (A32) The function of the DSP A32 is to perform return processing, clutter identification, clutter filtering, velocity extraction and editing, hazard computation, and hazard recognition algorithms. To accomplish these functions, the DSP A32 uses three digital signal processors that are interfaces serially. The DSP card consists of DSP1 and associated memory, CPU dual port RAM interface, DSP0 dual port RAM interface, DSP2 and associated memory, DSP3 and associated memory, an ARINC 453 output interface, and a set of interface latches between DSP1 and DSP2 and DSP2 and DSP3. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-18

WRT-701X DSP1 interfaces with CPU A34 and DSP0 of sampler A31. DSP2 and DSP3 perform return data processing tasks. In addition DSP3 generates the ARINC 453 formatted word sent to CPU A34, and eventually the system indicator. A clock distribution device (U47) distributes the 32-MHz clock generated by U53 to the three digital signal processors. L-12. CPU Card (A34) The control Processor (CPU) manages virtually all of the radar system operation. The CPU receives and decodes all aircraft data inputs, receives control commands from the cockpit control panel, manages the processing modes of the Sampler and DSP modules. The CPU also performs the antenna scanning and attitude stabilization functions. The CPU manages the internal test and monitoring functions. The CPU is an Intel 80196 processor running at 16 MHz. The CPU communicates with DSP1 through a dual port memory. The interface to the I/O card is through a bi-directional latch. The CPU utilizes a 16 MHz crystal controlled clock oscillator. L-13. I/O Card (A33) The I/O Card (A33) contains interfaces to various aircraft data sources including synchro attitude, synchro airspeed and heading, along with several Arinc 429 data sources. The CPU communicates with the I/O card through a bi-directional latch. An Intel 8031 BITE processor is also located on the I/O card. This processor stores detected faults in non-volatile memory and interfaces with the aircraft on-board maintenance systems. The BITE processor utilizes a 12 MHz crystal oscillator for a clock. L-14. Low Voltage Power Supply (A2) The Low Voltage Power Supply operates from the 115VAC 400Hz aircraft power bus and provides the power to all of the internal cards and modules. The power supply also supplies power to the external control panel, waveguide switch (dual installation) and antenna pedestal. All of the power lines that come into or leave the WRT-701X have the appropriate filtering and isolation to meet EMI requirements. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-19

WRT-701X L-15. Rear Interconnect Module (A1) The rear interconnect module provides the interconnect wiring between the WRT-701X rear connector and the power supply, circuit cards and modules contained within the WRT-701X. L-16. Front Panel The front panel contains a 15 pin circular test connector which provides an interface to an RS-232 terminal such as a laptop PC. The RS-232 interface is used for test and diagnostic purposes and is not connected to the aircraft. Functions available through the RS-232 interface include Programming of the CPU and DSP code, internal fault diagnostics, monitoring of external aircraft inputs and parameters, control of specialized test modes, and downloading of internally stored windshear events captured in flash memory. The front panel also includes a BNC Reference Output for locking an RF signal generator to the transmit/receive frequency during bench test. L-17. WRT-701X Oscillators and Critical Frequencies The following table lists the oscillators contained within the R/T unit and critical frequencies. Table L-2. WRT-701X Oscillators and Critical Frequencies Function Frequency KHz/MHz (A33) Universal I/O ARINC 429 Bus High 100.0 kHz (A33) Universal I/O ARINC 453 Bus 1.0 MHz (A33) Universal I/O UART Clock 2.0 MHz (A33) Universal I/O Clock 12.0 MHz (A33) BITE Processor Clock 12.0 MHz (A34) Main CPU Clock 16.0 MHz (A34) Processor UART Clock 2.0 MHz (A32) DSP – DSP1,DSP2,DSP3 Clock 12.0 MHz (A32) DSP - ARIES ARINC 429 High Speed UART 20.0 MHz (A32) DSP – DSP1,DSP2,DSP3 Data Bus 30.0 MHz (A32) DSP – DSPM, DSPM2 Data Bus 60.0 MHz (A31) Sampler DSP00, DSP01,DSP02 Data Bus 20.0 MHz (A31) Sampler – DPS00,DSP01,DSP02 Clock 40.0 MHz (A50) Source - PIC 16F873 Microcontroller Clock 16.0 MHz (A50) Source XTAL Oscillator 90.425144 MHz (A50) Source – DDS1 27.824659 MHz (A50) Source – DDS2 39.971892 - MHz 41.734681 MHz rd (A50) Source - 3 LO Drive 13.912329 MHz nd (A50) Source - 2 LO Drive 153.025628 MHz st (A50) Source - 1 LO Drive 763.373044 MHz 765.135833 MHz (A50) Source - Tx Drive 777.285374 MHz 779.047394 MHz (A51) Multiplier Tx Output / Rx RCV Frequency 9327.4244 - MHz 9348.5687 MHz st (A51) 1 IF Frequency 166.947958 MHz nd (A8) 2 IF Frequency 13.922329 MHz CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-20

WRT-701X L-18. Technical Report - Name and Address (Section 2.1033 (c) (1)) The name and address of the manufacturer of the WRT-701X Windshear Weather Radar Receiver/Transmitter and applicant for certification is Rockwell Collins, Inc., 1300 Wilson Boulevard, Suite 200, Arlington, Virginia 22209. L-19. FCC Identifier (Section 2.1033 (c) (2)) FCC ID Description Collins P/N AJK6225132-001 Receiver/Transmitter Unit (WRT-701X) 622-5132-6X4 L-20. Installation and Operation Manuals (Section 2.1033 (c) (3)) See Exhibit H. L-21. WRT-701X Emission Type is 12M5P0N The transmitter output pulses are rectangular unmodulated pulses ranging from 2 to 20 microseconds in width. Pulse repetition frequencies are from 240 Hz to 3000 Hz depending on the operating mode and range selected. Four separate pulsewidths are utilized dependent on the operating condition, 2.5, 5, 10 and 20 microseconds. The Necessary Bandwidth and emission type for each of these three pulsewidths is calculated per the equation contained in Section 2.202 (g) “Table of Necessary Bandwidths” entry for “Unmodulated Pulse Emissions” : Bn = 2K ÷ t, where K=1.5, t = pulse duration Pulse Width Emission Type 2 uSec 1M50P0N 5uSec 600KP0N 10uSec 300KP0N 20 uSec 150KP0N During operation, the WRT-701X Receiver/Transmitter utilizes multiple frequencies over the frequency range 9327.424 MHz to 9348.568 MHz described in further detail in Exhibit F - Required Measurements: Section F-2-Modulation Characteristics. The Maximum Channel Span condition is when the system is utilizing frequencies including the highest and lowest extreme channels (i.e. Channels 0-63). The Occupied Bandwidth while operating in the Maximum Channel Span condition is 12.5 MHz. Data for this Maximum Channel condition is included in Exhibit F-Occupied Bandwidth. Therefore, the Emission Type for the Maximum Channel Span condition is 12M5P0N. CPN 815-8720-001 Rev A Rockwell Collins - Proprietary Information Page L-21

WRT-701X L-22. Frequency Range (Section 2.1033 (c) (5)) The WRT-701X frequency range is 9327.424 MHz to 9348.568 MHz. The system can operate on any of 64 channels spaced at 187.5KHz over the above frequency range. The WRT-701X transmits and receives on the same frequency. The following table lists the transmit frequencies for each channel. The Frequency Tolerance is +/- 1 MHz which equates to 0.0107%. Table 3. WRT-701X Channel Frequencies (Mhz) DDS CH X Band TX DDS CH X Band TX 0 9327.424486 32 9333.424486 1 9327.611986 33 9333.611986 2 9327.799486 34 9333.799486 3 9327.986986 35 9333.986986 4 9328.174486 36 9334.174486 5 9328.361986 37 9334.361986 6 9328.549486 38 9334.549486 7 9328.736986 39 9334.736986 8 9328.924486 40 9334.924486 9 9329.111986 41 9335.111986 10 9329.299486 42 9335.299486 11 9329.486986 43 9335.486986 12 9329.674486 44 9335.674486 13 9329.861986 45 9335.861986 14 9330.049486 46 9336.049486 15 9330.236986 47 9336.236983 16 9330.424486 48 9336.424486 17 9330.611986 49 9336.611986 18 9330.799486 50 9336.799486 19 9330.986986 51 9336.986986 20 9331.174486 52 9337.174486 21 9331.361986 53 9337.361986 22 9331.549486 54 9337.549486 23 9331.736986 55 9337.736983 24 9331.924486 56 9337.924486 25 9332.111986 57 9338.111986 26 9332.290255 58 9338.299486 27 9332.486986 59 9338.486986 28 9332.674486 60 9338.674486 29 9332.861986 61 9338.861986 30 9333.049486 62 9348.662720 31 9333.236986 63 9348.568734 CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-22

WRT-701X L-23. Range of Operating Power Values (Section 2.1033 (c) (6)) The nominal power output for the WRT-701X is 150 Watts Peak (21.8dBW). There are no means for varying the transmitter power other than in bench test conditions. There are no operator controls that affect power output. L-24. Maximum Power Rating as Defined in Part 87 According to Section 87.131, there is no maximum power specified for the P0N class of emission. Note 9 states; “To be specified on license” Due to production variations, the transmitter power can range up to 250 watts. Therefore, the maximum transmitter output power is 250 Watts Peak (23dBW). L-25. DC Voltages and Currents (Section 2.1033 (c) (8)) The DC Voltage and Current applied to the RF Module (A514) power stages is shown in the following table. DC Supply Maximum DC Current Average DC Supply Voltage During Transmit Pulse Current +12.0 VDC 16.0 Amps 7.0 Amps Typical L-26. Tune Up Procedures (Section 2.1033 (c) (9)) See Exhibit J - Part 2. L-27. Schematics and Circuit Diagrams (Section 2.1033 (c) (10)) See Exhibit E. L-28. Nameplate Label Drawings (Section 2.1033 (c) (11)) See Exhibit A. L-29. Equipment Photographs: External Views (Section 2.1033 (c) (12)) See Exhibit C. L-30. Equipment Photographs: Internal Views (Section 2.1033 (c) (12)) See Exhibit I. L-31. Digital Modulation System (Section 2.1033 (c) (13)) Not Applicable L-32. Required Measurements (Section 2.1033 (c) (14)) See Exhibit F. CPN 815-8720-001 Rev - Rockwell Collins - Proprietary Information Page L-23


Document Created: 2005-05-24 09:43:40
Document Modified: 2005-05-24 09:43:40
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