Attachment 1 Mode S IF Monopulse Receiver LRU Replacement Requirements.pdf

Mode Select Beacon System (Mode S) Intermediate Frequency (IF)

Monopulse Receiver

Lowest Replaceable Unit (LRU) Replacement

Requirements

Federal Aviation

Administration

Revision: 1.0 Date Last Updated: 29-September-2019

Mode S/Digitizers, AJW-145 National Airways Systems Engineering

FAA William J. Hughes Technical Center Atlantic City International Airport, NJ 08405

IF Monopulse Receiver LRU Replacement Requirements ii

RECORD OF CHANGES

*A - ADDED M - MODIFIED D - DELETED

REVSION

NUMBER

DATE

NUMBER OF

FIGURE, TABLE

OR PARAGRAPH

A* M D

TITLE OR BRIEF DESCRIPTION

0.1 4/1/2018 A Original draft revision

0.2 4/26/2018 M Updated based on comments

0.3 5/7/2018 M Updated based on comments

0.4 6/27/2018 M Updated based on comments

0.5 5/16/2019 M Updated based on comments

0.6 6/24/2019 M Tracy’s editorial review.

0.7 8/27/2019 M Updated based on comments

0.8 9/3/2019 M Updated based on comments

1.0 10/29/2019 M Released version iii

Table of Contents 1 Introduction

1.1 Receiver Functional Overview

1.2 Antenna Pattern Characteristics

1.3 Receiver Characteristics

2 Requirements

2.1 System Interfaces

2.1.1 RF Receiver Interface

2.1.2 RFTTG Interface

2.1.3 VP/M Interface

2.1.4 Signal Monitor Panel and CTD Interface Board Interface

2.2 IF Monopulse Receiver General Processing Requirements

2.3 IF Monopulse Receiver Functions

2.3.1 IF Filter Combiner Function

2.3.2 Test Points

2.3.3 Monopulse Detector Function

2.3.3.1 Monopulse Accuracy

2.3.3.2 Pulse Response

2.3.4 Logarithmic Video Drivers Function

2.3.4.1 ER/LOGSIGM Video Driver

2.3.4.2 ER/LOGDELT Video Driver

2.3.4.3 ER/AUXLGSG Video Driver

2.3.4.4 ER/AUXLOG Video Driver

2.3.4.5 ER/LOGOMEG Video Driver

2.4 Input/Output Signals

2.5 Temperature Control

2.6 Power and Ground

2.7 Cabling

2.7.1 Heater and Temperature Sensor Cable

2.7.2 Power and Ground Cable

2.8 Mechanical

2.9 Environmental

iv

3 References

4 Reference Schematics and Diagrams

5 Definitions and Acronyms

Table of Figures

FIGURE 1 - ANTENNA RECEIVE PATTERNS

FIGURE 2 – SIMPLIFIED INTERROGATOR BLOCK DIAGRAM AND CTD MODIFICATION KIT

FIGURE 3 - SIGMA AND DELTA ANTENNA GAIN VS. ANGLE CURVES

FIGURE 4 – SIGMA AND OMEGA ANTENNA GAIN VS. ANGLE CURVES

FIGURE 5 – ER/A1IF ER/B1IF PHASE DIFFERENCE VS. DELTA/SIGMA RATIO

FIGURE 6 – RF RECEIVER DIAGRAM

FIGURE 7 – RFTTG DIAGRAM

FIGURE 8 – VP/M DIAGRAM

FIGURE 9 – SIGNAL MONITOR PANEL AND CTD INTERFACE BOARD DIAGRAM

FIGURE 10 – CURRENT IF MONOPULSE RECEIVER BLOCK DIAGRAM

FIGURE 11 – CURRENT IF FILTER COMBINER BLOCK DIAGRAM

FIGURE 12 – CURRENT MONOPULSE DETECTOR SUBASSEMBLY BLOCK DIAGRAM

FIGURE 13 – NOMINAL ER/MPLSVID VS. ER/A1IF AND ER/B1IF PHASE DIFFERENCE

FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM

FIGURE 15 – NOMINAL SIGMA VIDEO SIGNAL VS. SIGMA ER/A1IF AND ER/B1IF INPUT POWER

FIGURE 16 – NOMINAL ER/LOGDELT VS. DELTA ER/A1IF AND ER/B1IF INPUT POWER

FIGURE 17 – NOMINAL ER/LOGOMEG VS. ER/OMEGAIF INPUT POWER

FIGURE 18 - DC POWER SUPPLY AND GROUND PATH

FIGURE 19 – IF MONOPULSE RECEIVER CABLING DIAGRAM

FIGURE 20 - CURRENT IF MONOPULSE RECEIVER TOP CONNECTORS

FIGURE 21 - CURRENT IF MONOPULSE RECEIVER TEST POINT CONNECTORS

FIGURE 22 - CURRENT IF MONOPULSE RECEIVER BOTTOM CONNECTORS

FIGURE 23 - MODE S INTERROGATOR CABLES

FIGURE 24 - MODE S INTERROGATOR CABINET

FIGURE 25 - CURRENT IF MONOPULSE RECEIVER MECHANICAL LAYOUT

FIGURE 26 - INTERROGATOR CABINET HORIZONTAL CLEARANCE

FIGURE 27 – IF MONOPULSE RECEIVER PLATE BOTTOM

FIGURE 28 – IF MONOPULSE RECEIVER COVER

FIGURE 29 – CURRENT IF MONOPULSE RECEIVER SIGNAL FLOW

v

Table of Tables

TABLE 1 – DELTA TO SIGMA ANTENNA POWER RATIO VS. ER/A1IF AND ER/A1IF PHASE DIFFERENCE

TABLE 2 – RF RECEIVER CHARACTERISTICS

TABLE 3 – MONOPULSE VIDEO SIGNAL

TABLE 4 – MONOPULSE VIDEO SIGNAL PULSE RESPONSE

TABLE 5 – SIGMA LOG DETECTOR VIDEO SIGNALS

TABLE 6 – ER/LOGDELT VIDEO SIGNAL

TABLE 7 – ER/LOGOMEG VIDEO SIGNAL

TABLE 8 - IF INPUT SIGNALS

TABLE 9 – OUTPUT VIDEO SIGNAL DESCRIPTIONS

TABLE 10 – HEATER CONTROL SIGNAL DESCRIPTIONS

TABLE 11 – HEATER AND TEMPERATURE CABLE PINOUT

TABLE 12 - DC POWER CABLE PINPUT

1 Introduction

This document specifies the requirements for a fit and functional replacement of the Intermediate Frequency (IF) Monopulse Receiver within the Mode Select Beacon System (Mode S) Sensor.

The Mode S sensor is a ground-based secondary radar system capable of selective and general interrogation of transponder-equipped aircraft. There are approximately 143 operational Mode S radar systems in the National Airspace System (NAS). The Mode S sensor is comprised of the Interrogator, Data Processing System (DPS), Calibration Performance Monitoring Equipment (CPME), and power distribution equipment.

The Mode S uses monopulse detection, which has the benefits of reduced interrogation rates, improved reply degarbling, and false target identification compared to sliding window detection techniques. To perform monopulse detection, the Mode S inputs Sigma and Delta antenna channels for monopulse angle detection and an Omega channel for side lobe suppression (SLS).

As the antenna rotates, interrogation replies are received from aircraft that are at an angle (left or right) to the antenna boresight (pointed direction). The antenna gains for the Sigma and Delta channels vary with the off-boresight angle, allowing an aircraft’s off-boresight angle to be determined. An aircraft’s azimuth from the Mode S sensor can then be determined with the knowledge of the direction the antenna is pointing and the off-boresight angle. See FIGURE 1 - ANTENNA RECEIVE PATTERNS.

FIGURE 1 - ANTENNA RECEIVE PATTERNS

1.1 Receiver Functional Overview

This section describes the functionality of the existing Mode S receiver.

The RF (Radio Frequency) Receiver, IF Monopulse Receiver, and Video Processor/Monitor (VP/M) are Lowest Replaceable Units (LRU) comprising the receiver section of the Mode S Interrogator. The RF Receiver receives the Sigma, Delta, and Omega 1090 MHz RF signals from the antenna. A 90º hybrid coupler within the RF Receiver combines the Sigma (∑) and Delta (∆) RF signals to form RF signals A1RF and B1RF signals, defined as follows:

A1RF = (∑ + j ∆)/√2 B1RF = j(∑ - j ∆)/√2

Mixing the Sigma and Delta signals in a 90° hybrid coupler converts the Sigma and Delta amplitude ratio into a function of the A1RF and B1RF phases. The A1RF and B1RF phase difference is proportional to the Delta over Sigma amplitude ratio, making the phase difference proportional to the antenna off-boresight angle. The purpose of converting the Sigma and Delta to be a function of phase rather than amplitude is to prevent gain changes in the RF Receiver from significantly affecting off-boresight azimuth accuracy.

The RF Receiver then mixes the A1RF, B1RF, and Omega 1090 MHz signals with a 1030 MHz local oscillator signal to convert them to ER/A1IF, ER/B1IF, and ER/OMEGA 60 MHz IF signals, respectively. The phase difference between the A1RF and B1RF is maintained with the ER/A1IF and ER/B1IF signals when the RF Receiver mixes the signals.

Independent phase adjustment of the ER/A1IF and ER/B1IF signals is provided in the RF Receiver using 40° phase shifters. In addition, phase-matched cables are also used between the RF Receiver and the IF Monopulse Receiver. Note that no 60 MHz bandpass filter is applied to the A1IF, B1IF, and ER/Omega signals in the RF Receiver.

The IF Monopulse Receiver also receives IF test target signals from a RF Test Target Generator (RFTTG) via a 3-way power divider and couplers that inject the RFTTG signal into the A1IF, B1IF, and Omega IF signal paths.

The current IF Monopulse Receiver uses a 90º hybrid coupler to produce Sigma and Delta signals from the A1IF and B1IF signals. It also produces a monopulse video signal that corresponds to the relative phase between the A1IF and B1IF signals.

The recovered Sigma, Delta, and Omega IF signals are input to separate matched logarithmic amplifier/detectors to produce Sigma (ER/LOGSIM), Delta (ER/LOGDELT), and Omega (ER/LOGOMEG) log video output signals sent to the VP/M. The monopulse video signal is also sent to the VP/M.

In addition, the IF Monopulse Receiver also produces two auxiliary Sigma log video outputs, ER/AUXLGSG and ER/AUXLOG. The ER/AUXLGSG log video signal is sent to the VP/M for use in a backup mode. The ER/AUXLOG log video signal is sent to the Signal Monitor Panel A17 as a test point, and at ASR-8/Mode S sites to the Common Terminal Digitizer (CTD) Interface Board. See FIGURE 2 – SIMPLIFIED INTERROGATOR

BLOCK DIAGRAM AND CTD MODIFICATION KIT.

FIGURE 2 – SIMPLIFIED INTERROGATOR BLOCK DIAGRAM AND CTD MODIFICATION KIT

1.2 Antenna Pattern Characteristics

The antenna gains for the Sigma and Delta channels vary with the off-boresight angle. At antenna boresight, the Sigma gain is at a maximum, whereas the Delta gain is at a minimum. See FIGURE 3 - SIGMA AND DELTA ANTENNA GAIN VS. ANGLE CURVES and FIGURE 4 – SIGMA AND OMEGA ANTENNA GAIN VS. ANGLE CURVES. Crossover is the off-boresight angle where the Sigma and Delta gains are equal. There are two crossover angles, one to the left and the other to the right of antenna boresight.

The Sigma and Delta RF signals are aligned to be in phase on one side of antenna boresight and 180º out of phase on the other side of antenna boresight.

The Mode S sensor is required to process aircraft replies when the aircraft is within the antenna beam from a Delta to Sigma voltage ratio of 2:1 (6 dB). The combined Sum and Delta antenna input power is maximum at antenna boresight. Although dependent on the specific antenna, the combined Sigma and Delta antenna power when the Delta to Sigma voltage ratio is 2:1 has a combined power approximately

1.8 dB less than the Sigma antenna power at boresight.

FIGURE 3 - SIGMA AND DELTA ANTENNA GAIN VS. ANGLE CURVES

FIGURE 4 – SIGMA AND OMEGA ANTENNA GAIN VS. ANGLE CURVES

1.3 Receiver Characteristics

The calculated phase differences between ER/A1IF and ER/B1IF vs. the Delta to Sigma Ratio is shown in FIGURE 5 – ER/A1IF ER/B1IF PHASE DIFFERENCE VS. DELTA/SIGMA RATIO. The nominal phase differences between ER/A1IF and ER/B1IF for key Delta/Sigma amplitude ratios are shown in TABLE 1 –

DELTA TO SIGMA ANTENNA POWER RATIO VS. ER/A1IF AND ER/A1IF PHASE DIFFERENCE.

FIGURE 5 – ER/A1IF ER/B1IF PHASE DIFFERENCE VS. DELTA/SIGMA RATIO

TABLE 1 – DELTA TO SIGMA ANTENNA POWER RATIO VS. ER/A1IF AND ER/A1IF PHASE DIFFERENCE

Delta/Sigma Power Ratio (dB) ER/A1IF and ER/A1IF Phase Difference (º)

6 dB, Left of Boresight -37

0 dB, Left Side Crossover 0

-∞ dB, Boresight 90

0 dB, Right Side Crossover 180

6 dB, Right of Boresight 217

The Mode S sensor is installed at terminal (airport) and en route (long range) sites. The Mode S is required to process aircraft replies at the RF Receiver from -20 dBm to -82 dBm at terminal sites and from -20 dBm to -85 dBm at en route sites; the replies are from 1087.0 MHz to 1093.0 MHz in frequency. The RF Receiver has gains of 41 dB ±2 dB for the ER/A1IF and ER/B1IF channels and 44 dB ±2 dB for the ER/OMEGAIF channel.

2 Requirements

2.1 System Interfaces

This section describes the interface between the IF Monopulse Receiver replacement and other sections of the Mode S system.

[IF-RCVR-SPEC-0001] The IF Monopulse Receiver replacement must accept the same set of input signals and produce the same set of output signals as the existing IF Monopulse Receiver.

2.1.1 RF Receiver Interface

The RF Receiver provides three 60 MHz IF signals, ER/A1IF, ER/B1IF, and ER/OMEGAIF, to the IF Monopulse Receiver. The ER/A1IF and ER/B1IF are ideally the same magnitude but contain a phase difference that represents the amplitude difference between the Sigma and Delta antenna signals. The mixing of the 1090 MHz RF signals with a 1030 MHz local oscillator signal generates the 60 MHz signals. The RF Receiver does not contain a bandpass filter to remove harmonic components. See TABLE 2 – RF RECEIVER

CHARACTERISTICS.

TABLE 2 – RF RECEIVER CHARACTERISTICS

Outputs on the ER/A1IF, ER/B1IF, and ER/OMEGAIF Channels Center Frequency: 60 MHz Maximum Output Power 23 dBm Receiver Gain: 41 dB ±2 dB for ER/AIF and ER/B1IF, 44 dB ±2 dB for ER/OMEGAIF

Maximum ±0.5 dB gain difference between the ER/A1IF and ER/B1IF channels

Bandwidth: 8.5 MHz 1 dB Compression Point: 24.5 dBm Image Reject Mixers: RF Receiver does not provide image rejection

The RF Receiver also provides modulated Alternating Current (AC) power to a heater located in the current IF Monopulse Receiver. The current IF Monopulse Receiver contains a temperature sensor to provide a feedback signal to the RF Receiver to control whether AC power is supplied to the heater. The heater maintains a relatively constant temperature to minimize the temperature dependence of its components.

See FIGURE 6 – RF RECEIVER DIAGRAM.

FIGURE 6 – RF RECEIVER DIAGRAM

2.1.2 RFTTG Interface

The RFTTG provides a single 60 MHz IF signal, ER/IFTEST, which passes through a 3:1 power divider in the current IF Monopulse Receiver. The ER/IFTEST signal is used as an alternative 60 MHz IF A1, B1, and Omega input signal to the IF Monopulse Receiver for test purposes. The ER/IFTEST signal is generated by a RF Switch and the output impedance of the RFTTG is 50 Ω. See FIGURE 7 – RFTTG DIAGRAM.

FIGURE 7 – RFTTG DIAGRAM

2.1.3 VP/M Interface

The IF Monopulse Receiver provides five output signals to the VP/M board. These signals include the four detected log video signals, ER/LOGSIGM, ER/LOGDELT, ER/LOGOMEG, and ER/AUXLGSG, along with the monopulse video signal ER/MPLSVID. See FIGURE 8 – VP/M DIAGRAM.

FIGURE 8 – VP/M DIAGRAM

2.1.4 Signal Monitor Panel and CTD Interface Board Interface

The IF Monopulse Receiver provides the ER/AUXLOG to the interrogator signal monitor panel. In addition, the signal is also routed to the CTD Interface Board within the Mode S Junction Box (MSJB) at ASR-8 sites.

See FIGURE 9 – SIGNAL MONITOR PANEL AND CTD INTERFACE BOARD DIAGRAM.

FIGURE 9 – SIGNAL MONITOR PANEL AND CTD INTERFACE BOARD DIAGRAM

2.2 IF Monopulse Receiver General Processing Requirements

The IF Monopulse Receiver has general processing requirements listed below.

[IF-RCVR-SPEC-0002] The IF Monopulse Receiver must operate on IF signals from Mode S replies as described in Chapter 3 of the ICAO Annex 10 Volume IV.

[IF-RCVR-SPEC-0003] The IF Monopulse Receiver must operate on IF signals for ATCRBS replies as described in Chapter 3 of the ICAO Annex 10 Volume IV.

[IF-RCVR-SPEC-0004] The IF Monopulse Receiver must be repairable when components fail.

[IF-RCVR-SPEC-0005] The IF Monopulse Receiver outputs must be able to be adjusted when installed within the Mode S.

2.3 IF Monopulse Receiver Functions

The current IF Monopulse Receiver contains four major subassemblies: Monopulse Detector (A1), IF Filter Combiner (A2), Log Detector (A3), and Auxiliary Video (A4). See FIGURE 10 – CURRENT IF MONOPULSE RECEIVER BLOCK DIAGRAM and FIGURE 29 – CURRENT IF MONOPULSE RECEIVER SIGNAL

FLOW.

FIGURE 10 – CURRENT IF MONOPULSE RECEIVER BLOCK DIAGRAM

2.3.1 IF Filter Combiner Function

The function of the current IF Filter Combiner is to receive and couple the 60 MHz IF inputs and perform bandpass filtering centered at 60 MHz on the coupled inputs before being used by the rest of the subassemblies. See FIGURE 11 – CURRENT IF FILTER COMBINER BLOCK DIAGRAM.

FIGURE 11 – CURRENT IF FILTER COMBINER BLOCK DIAGRAM

[IF-RCVR-SPEC-0006] The IF Monopulse Receiver must receive the ER/IFTEST signal from the RFTTG via SMA port J2.

[IF-RCVR-SPEC-0007] The IF Monopulse Receiver must receive the ER/A1IF signal from the RF Receiver via SMA port J1.

[IF-RCVR-SPEC-0008] The IF Monopulse Receiver must receive the ER/B1IF signal from the RF Receiver via SMA port J3.

[IF-RCVR-SPEC-0009] The IF Monopulse Receiver must receive the ER/OMEGAIF signal from the RF Receiver via SMA port J4.

[IF-RCVR-SPEC-0010] The IF Monopulse Receiver must split the ER/IFTEST input into three 60 MHz signals that are equal in power and phase as if received on the ER/A1IF, ER/B1IF, and ER/OMEGAIF inputs.

2.3.2 Test Points

The current IF Monopulse Receiver test point signals are used for testing during the receiver alignment procedure. The front of the IF Monopulse Receiver is considered from the perspective of the IF Monopulse Receiver mounting plate along its length and height. See FIGURE 24 - MODE S INTERROGATOR CABINET and FIGURE 25 - CURRENT IF MONOPULSE RECEIVER MECHANICAL LAYOUT.

[IF-RCVR-SPEC-0011] The IF Monopulse Receiver must provide three 60 MHz IF signal outputs: ER/A1TP, ER/B1TP, and ER/OMEGATP.

[IF-RCVR-SPEC-0012] The vendor must provide the phase difference between ER/A1TP and ER/B1TP when an antenna boresight test signal is input into the RF Receiver. For a boresight test signal, the Delta RF signal has no energy, and the phase difference between ER/A1IF and ER/B1IF is 90º.

[IF-RCVR-SPEC-0013] The ER/A1TP signal must be derived from the ER/A1IF signal.

[IF-RCVR-SPEC-0014] The ER/B1TP signal must be derived from the ER/B1IF signal.

[IF-RCVR-SPEC-0015] The ER/OMEGATP signal must be derived from the ER/OMEGA1IF signal.

[IF-RCVR-SPEC-0016] The ER/A1TP signal must be routed to the IF Monopulse Receiver SMA port J18.

[IF-RCVR-SPEC-0017] The ER/B1TP signal must be routed to IF Monopulse Receiver SMA port J17.

[IF-RCVR-SPEC-0018] The ER/OMEGATP signal must be routed to IF Monopulse Receiver SMA port J16.

[IF-RCVR-SPEC-0019] The SMA port J18 test point must be accessible from the front of the IF Monopulse Receiver.

[IF-RCVR-SPEC-0020] The SMA port J17 test point must be accessible from the front of the IF Monopulse Receiver.

[IF-RCVR-SPEC-0021] The SMA port J16 test point must be accessible from the front of the IF Monopulse Receiver.

2.3.3 Monopulse Detector Function

The function of the current Monopulse Detector (A1) is to generate a linear output from 0 V to -3.42 V that corresponds to the phase difference between the ER/A1IF and ER/B1IF inputs from -37º to 217º.

See FIGURE 12 – CURRENT MONOPULSE DETECTOR SUBASSEMBLY BLOCK DIAGRAM and FIGURE 13 –

NOMINAL ER/MPLSVID VS. ER/A1IF AND ER/B1IF PHASE DIFFERENCE.

FIGURE 12 – CURRENT MONOPULSE DETECTOR SUBASSEMBLY BLOCK DIAGRAM

FIGURE 13 – NOMINAL ER/MPLSVID VS. ER/A1IF AND ER/B1IF PHASE DIFFERENCE

[IF-RCVR-SPEC-0022] The IF Monopulse Receiver must output the ER/MPLSVID video signal on IF Monopulse Receiver SMA port J11.

[IF-RCVR-SPEC-0023] The IF Monopulse Receiver must have ER/MPLSVID Gain Adjustors to adjust the slope of the ER/MPLSVID video signal.

[IF-RCVR-SPEC-0024] The ER/MPLSVID Gain Adjustors must affect only the ER/MPLSVID video signal.

[IF-RCVR-SPEC-0025] The IF Monopulse Receiver must have an ER/MPLSVID DC Offset Adjustor to adjust the ER/MPLSVID video signal DC offset voltage.

[IF-RCVR-SPEC-0026] The ER/MPLSVID DC Offset Adjustor must affect only the ER/MPLSVID video signal.

2.3.3.1 Monopulse Accuracy

[IF-RCVR-SPEC-0027] The ER/MPLSVID video signal must have the characteristics shown in TABLE 3 – MONOPULSE VIDEO SIGNAL corresponding to the relative phase of inputs ER/A1IF and ER/B1IF. The specification must be met when the ER/MPLSVID video signal is terminated to a 75 ±1 Ω load.

TABLE 3 – MONOPULSE VIDEO SIGNAL

Output Range: Nominal 0 V to -3.42 V when terminated into 75 ±1 Ω.

Minimum 0.5 V to -3.92 V for full adjustment range when terminated into 75 ±1 Ω.

Nominal Function: ER/MPLSVID = (((A1IF and B1IF Phase Difference)º + 37º)/254º) * (-3.42) V.

Accuracy: The ER/MPLSVID video signal accuracy must indicate the relative phase of inputs ER/A1IF and ER/B1IF to within ±3° for all frequencies within ±3 MHz of the 60 MHz IF nominal center frequency for coherent CW inputs.

Gain Adjustors Range ±5.0 mV/º from nominal function.

Offset Adjustor Range ±0.50 V from nominal function.

Noise with CW: The ER/MPLSVID video signal noise must not exceed 5 mV RMS when 60 MHz CW signals are input into the ER/A1IF and ER/B1IF inputs. The RMS value exceeds six standard deviations of measured noise.

Noise with Standard Test Pulse:

The ER/MPLSVID video signal noise must not exceed 18 mV RMS when standard test pulses are input into the ER/A1IF and ER/B1IF inputs. The RMS value exceeds six standard deviations of measured noise.

The standard test pulse is an IF pulse with a trapezoidal envelope, 450 nS wide at a level of 6 dB below peak amplitude, and with rise and fall times of 100 nS from 1 dB below peak amplitude to 40 dB below peak.

2.3.3.2 Pulse Response

[IF-RCVR-SPEC-0028] The ER/MPLSVID video signal pulse response must have the characteristics shown in TABLE 4 – MONOPULSE VIDEO SIGNAL PULSE RESPONSE for all pulse amplitudes and frequencies within the receiver normal operating range.

TABLE 4 – MONOPULSE VIDEO SIGNAL PULSE RESPONSE

Rise and Fall Time: The ER/MPLSVID video signal must reach the nominal steady state value within 0.2 µS and maintain that value to within ±1.5° for 0.2 µS.

Peak to Peak Variation: The ER/MPLSVID video signal during the 0.2 µS interval must yield an estimate of Delta/Sigma with a peak-to-peak variation not exceeding 0.10 (1 + | ∆ / ∑ | 2), 0.025 (1 +| ∆ / ∑| 2) RMS, for ∆ / ∑ within the receiver normal operating range.

Maximum Variation: The ER/MPLSVID video signal maximum variation from the calibration point (1090 MHz and -52 dBm) measurement must not exceed 0.062 (1 + | ∆ / ∑ |2) within the receiver normal operating range.

2.3.4 Logarithmic Video Drivers Function

The function of the current Logarithmic Video Drivers is to receive the IF signals from the Filter Combiner (A2) and create Sigma, Delta, and Omega logarithmic video signals. See FIGURE 14 –CURRENT

LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM.

FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM

2.3.4.1 ER/LOGSIGM Video Driver

The function of the current ER/LOGSIGM Video Driver is to output a logarithmic amplification of the Sigma signal that is embedded within the ER/A1IF and ER/B1IF inputs. The Sigma signal can be obtained from the ER/A1IF and ER/B1IF signals using a 90º hybrid coupler. See FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM and FIGURE 15 – NOMINAL SIGMA VIDEO SIGNAL VS.

SIGMA ER/A1IF AND ER/B1IF INPUT POWER.

FIGURE 15 – NOMINAL SIGMA VIDEO SIGNAL VS. SIGMA ER/A1IF AND ER/B1IF INPUT POWER

[IF-RCVR-SPEC-0029] The IF Monopulse Receiver must generate the ER/LOGSIGM video signal derived from the Sigma signal in the ER/A1IF and ER/B1IF input signals.

[IF-RCVR-SPEC-0030] The IF Monopulse Receiver must output the ER/LOGSIGM video signal.

[IF-RCVR-SPEC-0031] The IF Monopulse Receiver must have ER/LOGSIGM Gain Adjustors to adjust the slope of the ER/LOGSIGM video signal.

[IF-RCVR-SPEC-0032] The ER/LOGSIGM Gain Adjustors must affect only the ER/LOGSIGM video signal.

[IF-RCVR-SPEC-0033] The IF Monopulse Receiver must have an ER/LOGSIGM DC Offset Adjustor to adjust the ER/LOGSIGM video signal DC offset voltage.

[IF-RCVR-SPEC-0034] The ER/LOGSIGM DC Offset Adjustor must affect only the ER/LOGSIGM video signal.

[IF-RCVR-SPEC-0035] The ER/LOGSIGM video signal must have the characteristics shown in TABLE 5 – SIGMA LOG DETECTOR VIDEO SIGNALS. The specification must be met when the ER/LOGSIGM video signal is terminated to a 75 ±1 Ω load.

TABLE 5 – SIGMA LOG DETECTOR VIDEO SIGNALS

Input Dynamic Range: The Sigma dynamic range is 80 dB as derived from the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Maximum Input Power The Sigma maximum input power is 23 dBm as derived from the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Output Range: Nominal 0 V – 2.0 V when terminated into 75 ±1 Ω.

Nominal Function: Logarithmic Video Signal = (0.025 * (NdB + 9) + 1.250 V) where NdB = Sigma Power at ER/A1IF and ER/B1IF in dBm .

The logarithmic video output signal must have a nominal value of 1250 mV when a total Sigma antenna channel power received at the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs is -9 dBm.

The logarithmic video output signal must have a nominal slope of 25 mV/dB for the total corresponding Sigma antenna channel power over the full range of the ER/A1IF and ER/B1IF input signals.

Linearity: < ±0.5 dB.

Gain Adjustors Range: 25 ±7.5 mV/dB over the full range of the total corresponding Sigma antenna channel power in the IF Monopulse Receiver ER/A1IF and ER/B1IF input signals.

Offset Adjustor Range: ±0.35 V DC offset from nominal function.

Total Adjustors Range: The logarithmic video output signal Gain and DC Offset Adjustors must be sufficient to produce an output video signal of 1250 ±50 mV when -9 dBm ±3dB 60 MHz phase matched CW signals are inserted to the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Stability: Transfer characteristic of voltage vs. RF dBm input level must be stable to within the equivalent of ±1 dB for a period in excess of 1000 hours.

Rise Time: < 100 nS from -40 dB referred to peak to -3.0 dB referred to peak for a 60 MHz IF pulse input with a rise time of less than 20 nS.

Fall Time: < 100 ns from -3.0 dB referred to peak to -40 dB referred to peak for a 60 MHz IF pulse input with a fall time less than 20 nS.

Noise with Standard Test Pulse:

The video signal noise must not exceed 6 mV RMS when standard test pulses are input into the ER/A1IF and ER/B1IF inputs. The RMS value exceeds six standard deviations of measured noise.

The standard test pulse is a 60 MHz IF pulse with a trapezoidal envelope, 450 nS wide at a level of 6 dB below peak amplitude, and with rise and fall times of 100 nS from 1 dB below peak amplitude to 40 dB below peak.

Noise Floor The noise floor must be between 0 and 75 mV.

2.3.4.2 ER/LOGDELT Video Driver

The function of the current ER/LOGDELT Video Driver is to output a logarithmic amplification of the Delta signal that is embedded within the ER/A1IF and ER/B1IF inputs. The Delta signal can be obtained from the ER/A1IF and ER/B1IF signals using a 90º hybrid coupler. See FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM and FIGURE 16 – NOMINAL ER/LOGDELT VS. DELTA

ER/A1IF AND ER/B1IF INPUT POWER.

FIGURE 16 – NOMINAL ER/LOGDELT VS. DELTA ER/A1IF AND ER/B1IF INPUT POWER

[IF-RCVR-SPEC-0036] The IF Monopulse Receiver must generate the ER/LOGDELT video signal derived from the Delta signal in the ER/A1IF and ER/B1IF input signals.

[IF-RCVR-SPEC-0037] The IF Monopulse Receiver must output the ER/LOGDELT video signal.

[IF-RCVR-SPEC-0038] The IF Monopulse Receiver must have ER/LOGDELT Gain Adjustors to adjust the slope of the ER/LOGDELT video signal.

[IF-RCVR-SPEC-0039] The ER/LOGDELT Gain Adjustors must affect only the ER/LOGDELT video signal.

[IF-RCVR-SPEC-0040] The IF Monopulse Receiver must have an ER/LOGDELT DC Offset Adjustor to adjust the ER/LOGDELT video signal DC offset voltage.

[IF-RCVR-SPEC-0041] The ER/LOGDELT DC Offset Adjustor must affect only the ER/LOGDELT video signal.

[IF-RCVR-SPEC-0042] The ER/LOGDELT video signal must have the characteristics shown in TABLE 6 – ER/LOGDELT VIDEO SIGNAL. The specification must be met when the ER/LOGDELT video signal is terminated to a 75 ±1 Ω load.

TABLE 6 – ER/LOGDELT VIDEO SIGNAL

Input Dynamic Range: The Delta dynamic range is 80 dB as derived from the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Maximum Input Power The Delta maximum input power is 23 dBm as derived from the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Output Range: Nominal 0 V – 2.0 V when terminated into 75 ±1 Ω.

Nominal Function: Logarithmic Video Signal = (0.025 * (NdB + 9) + 1.250 V) where NdB = Delta

Power at ER/A1IF and ER/B1IF in dBm.

The logarithmic video output signal must have a nominal value of 1250 mV when a total Delta antenna channel power received at the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs is -9 dBm.

The logarithmic video output signal must have a nominal slope of 25 mV/dB for the total corresponding Delta antenna channel power over the full range of the ER/A1IF and ER/B1IF input signals.

Linearity: < ±0.5 dB.

Gain Adjustors Range: 25 mV/dB ±7.5 mV/dB over the full range of the total corresponding Delta antenna channel power in the IF Monopulse Receiver ER/A1IF and ER/B1IF input signals.

Offset Adjustor Range: ±0.35 V DC offset from nominal function.

Adjustor Range: The logarithmic video output signal Gain and DC Offset Adjustors must be sufficient to produce an output video signal of 1250 ±50 mV when -9 dBm ±3dB 60 MHz phase matched CW signals are inserted to the IF Monopulse Receiver ER/A1IF and ER/B1IF inputs.

Stability: Transfer characteristic of voltage vs. RF dBm input level must be stable to within the equivalent of ±1 dB for period in excess of 1000 hours.

Rise Time: < 100 nS from -40 dB referred to peak to -3.0 dB referred to peak for an IF pulse input with a rise time of less than 20 nS.

Fall Time: < 100 ns from -3.0 dB referred to peak to -40 dB referred to peak for an IF pulse input with a fall time less than 20 nS.

Noise with Standard Test Pulse:

The video signal noise must not exceed 6 mV RMS when standard test pulses are input into the ER/A1IF and ER/B1IF inputs. The RMS value exceeds six standard deviations of measured noise.

The standard test pulse is an RF pulse with a trapezoidal envelope, 450 nS wide at a level of 6 dB below peak amplitude, and with rise and fall times

2.3.4.3 ER/AUXLGSG Video Driver

The function of the current ER/AUXLGSG Video Driver is to output a logarithmic amplification of the Sigma signal that is embedded within the ER/A1IF and ER/B1IF inputs. The Sigma signal can be obtained from the ER/A1IF and ER/B1IF signals using a 90º hybrid coupler. See FIGURE 14 –CURRENT LOGARITHMIC

VIDEO DRIVERS BLOCK DIAGRAM and FIGURE 15 – NOMINAL SIGMA VIDEO SIGNAL VS. SIGMA ER/A1IF

AND ER/B1IF INPUT POWER.

[IF-RCVR-SPEC-0043] The IF Monopulse Receiver must generate the ER/AUXLGSG video signal derived from the Sigma signal in the ER/A1IF and ER/B1IF input signals.

[IF-RCVR-SPEC-0044] The IF Monopulse Receiver must output the ER/AUXLGSG video signal.

[IF-RCVR-SPEC-0045] The IF Monopulse Receiver must have ER/AUXLGSG Gain Adjustors to adjust the slope of the ER/AUXLGSG video signal.

[IF-RCVR-SPEC-0046] The ER/AUXLGSG Gain Adjustors must affect only the ER/AUXLGSG video signal.

[IF-RCVR-SPEC-0047] The IF Monopulse Receiver must have an ER/AUXLGSG DC Offset Adjustor to adjust the ER/AUXLGSG video signal DC offset voltage.

[IF-RCVR-SPEC-0048] The ER/AUXLGSG DC Offset Adjustor must affect only the ER/AUXLGSG video signal.

[IF-RCVR-SPEC-0049] The ER/AUXLGSG video signal must have the characteristics shown in TABLE 5 – SIGMA LOG DETECTOR VIDEO SIGNALS. The specification must be met when the ER/AUXLGSG video signal is terminated to a 75 ±1 Ω load.

2.3.4.4 ER/AUXLOG Video Driver

The function of the current ER/AUXLOG Video Driver is to output a logarithmic amplification of the Sigma signal that is embedded in the ER/A1IF and ER/B1IF inputs. The Sigma signal can be obtained from the ER/A1IF and ER/B1IF signals using a 90º hybrid coupler. See FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM and FIGURE 15 – NOMINAL SIGMA VIDEO SIGNAL VS. SIGMA ER/A1IF AND

ER/B1IF INPUT POWER.

[IF-RCVR-SPEC-0050] The IF Monopulse Receiver must generate the ER/AUXLOG video signal derived from the Sigma signal in the ER/A1IF and ER/B1IF input signals.

[IF-RCVR-SPEC-0051] The IF Monopulse Receiver must output the ER/AUXLOG video signal.

[IF-RCVR-SPEC-0052] The IF Monopulse Receiver must have ER/AUXLOG Gain Adjustors to adjust the slope of the ER/AUXLOG video signal.

[IF-RCVR-SPEC-0053] The ER/AUXLOG Gain Adjustors must affect only the ER/AUXLOG video signal.

[IF-RCVR-SPEC-0054] The IF Monopulse Receiver must have an ER/AUXLOG DC Offset Adjustor to adjust the ER/AUXLOG video signal DC offset voltage.

[IF-RCVR-SPEC-0055] The ER/AUXLOG DC Offset Adjustor must affect only the ER/AUXLOG video signal.

[IF-RCVR-SPEC-0056] The ER/AUXLOG video signal must have the characteristics shown in TABLE 5 – SIGMA LOG DETECTOR VIDEO SIGNALS. The specification must be met when the ER/AUXLOG is terminated to a 75 ±1 Ω load.

2.3.4.5 ER/LOGOMEG Video Driver

The function of the current ER/LOGOMEG Video Driver is to output a logarithmic amplification of the ER/OMEGAIF signal. See FIGURE 14 –CURRENT LOGARITHMIC VIDEO DRIVERS BLOCK DIAGRAM and

FIGURE 17 – NOMINAL ER/LOGOMEG VS. ER/OMEGAIF INPUT POWER.

FIGURE 17 – NOMINAL ER/LOGOMEG VS. ER/OMEGAIF INPUT POWER

[IF-RCVR-SPEC-0057] The IF Monopulse Receiver must generate the ER/LOGOMEG video signal derived from the ER/OMEGAIF input signal.

[IF-RCVR-SPEC-0058] The IF Monopulse Receiver must output the ER/LOGOMEG video signal.

[IF-RCVR-SPEC-0059] The IF Monopulse Receiver must have ER/LOGOMEG Gain Adjustors to adjust the slope of the ER/LOGOMEG video signal.

[IF-RCVR-SPEC-0060] The ER/LOGOMEG Gain Adjustors must affect only the ER/LOGOMEG video signal.

[IF-RCVR-SPEC-0061] The IF Monopulse Receiver must have an ER/LOGOMEG DC Offset Adjustor to adjust the ER/LOGOMEG video signal DC offset voltage.

[IF-RCVR-SPEC-0062] The ER/LOGOMEG DC Offset Adjustor must affect only the ER/LOGOMEG video signal.

[IF-RCVR-SPEC-0063] The ER/LOGOMEG video signal must have the characteristics shown in TABLE 7 – ER/LOGOMEG VIDEO SIGNAL. The specification must be met when the ER/LOGOMEG video signal is terminated to a 75 ±1 Ω load.

TABLE 7 – ER/LOGOMEG VIDEO SIGNAL

Input Dynamic Range: The Omega dynamic range is 80 dB as derived from the IF Monopulse Receiver ER/OMEGAIF input.

Maximum Input Power The Omega maximum input power is 23 dBm as derived from the IF Monopulse Receiver ER/OMEGAIF input.

Output Range: Nominal 0 V – 2.0 V when terminated into 75 ±1 Ω.

Nominal Function: ER/LOGOMEG = (0.025 * (NdB + 9) + 1.250) V where NdB = Power at

ER/OMEGAIF in dBm.

The logarithmic video output signal must have a nominal value of 1250 mV when -9 dBm is received at the IF Monopulse Receiver ER/OMEGAIF input.

The logarithmic video output signal must have a nominal slope of 25 mV/dB for the IF Monopulse Receiver ER/OMEGAIF input.

Linearity: < ±0.5 dB.

Gain Adjustors Range: 25 mV/dB ±7.5 mV/dB over the full range of the ER/OMEGAIF input signal.

Offset Adjustor Range: ±0.35 V DC offset from nominal function.

Adjustor Range: The logarithmic video output signal Gain and DC Offset Adjustors must be sufficient to produce an output video signal of 1250 mV ±50 mV when -9 dBm ±3dB is received at the ER/OMEGAIF input.

Stability: Transfer characteristic of voltage vs. RF dBm input level must be stable to within the equivalent of ±1 dB for period in excess of 1000 hours.

Rise Time: < 100 nS from -40 dB referred to peak to -3.0 dB referred to peak for an IF pulse input with a rise time of less than 20 nS.

Fall Time: < 100 ns from -3.0 dB referred to peak to -40 dB referred to peak for an IF pulse input with a fall time less than 20 nS.

Noise with Standard Test Pulse:

The video signal noise must not exceed 6 mV RMS when standard test pulses are input into the ER/OMEGAIF input. The RMS value exceeds six standard deviations of measured noise.

The standard test pulse is an RF pulse with a trapezoidal envelope, 450 nS wide at a level of 6 dB below peak amplitude, and with rise and fall times

2.4 Input/Output Signals

See TABLE 8 - IF INPUT SIGNALS for the characteristics of the 60 MHz IF input signals from the RF Receiver to the IF Monopulse Receiver.

TABLE 8 - IF INPUT SIGNALS

Input Signal IF Frequency Max Input Power Max VSWR ER/A1IF 60 ±3 MHz 19 dBm 1.5:1 at IF ER/B1IF 60 ±3 MHz 19 dBm 1.5:1 at IF

ER/OMEGA 60 ±3 MHz 19 dBm 1.5:1 at IF ER/IFTEST 60 ±3 MHz 5 dBm 1.5:1 at IF

[IF-RCVR-SPEC-0064] The IF Monopulse Receiver video output signals must contain output impedances to match the VP/M input circuitry to limit signal reflections.

[IF-RCVR-SPEC-0065] The ER/AUXLOG video output signal must contain output impedances to match the CTD Interface Board.

[IF-RCVR-SPEC-0066] The IF Monopulse Receiver video outputs must be designed so that a short or failure in one output shall not affect the other outputs.

[IF-RCVR-SPEC-0067] The IF Monopulse Receiver video outputs must be able to drive an open circuit without damage to the IF Monopulse Receiver circuitry.

[IF-RCVR-SPEC-0068] The IF Monopulse Receiver video outputs must be able to drive a short circuit without damage to IF Monopulse Receiver circuitry.

[IF-RCVR-SPEC-0069] The IF Monopulse Receiver video outputs must have the characteristics shown in

TABLE 9 – OUTPUT VIDEO SIGNAL DESCRIPTIONS.

TABLE 9 – OUTPUT VIDEO SIGNAL DESCRIPTIONS

Signal Name Description I/O Destination ER/MPLSVID Output Range: Nominal 0 V to -2 V, Maximum 0.25 V to -2.25

V. 75 ±1 Ω Termination.

O VP/M

ER/LOGSIGM Output Range: Nominal 0 V to 2 V, Maximum -0.35 V to 2.35 V. 75 ±1 Ω Termination.

O VP/M

ER/LOGDELT Output Range: Nominal 0 V to 2 V, Maximum -0.35 V to 2.35 V. 75 ±1 Ω Termination.

O VP/M

ER/LOGOMEG Output Range: Nominal 0 V to 2 V, Maximum -0.35 V to 2.35 V. 75 ±1 Ω Termination.

O VP/M

ER/AUXLGSG Output Range: Nominal 0 V to 2 V, Maximum -0.35 V to 2.35 V. 75 ±1 Ω Termination.

O VP/M

ER/AUXLOG Output Range: Nominal 0 V to 2 V, Maximum -0.35 V to 2.35 V when connected to the CTD Interface Board. 75 ±1 Ω Termination when connected to the CTD Interface Board.

O Video Panel/ CTD Interface

Board

2.5 Temperature Control

The current IF Monopulse Receiver receives 120 V AC power from the RF Receiver heater circuit to maintain a constant temperature. The current IF Monopulse Receiver contains a negative coefficient thermistor that outputs a signal to the RF Receiver heater control circuit to turn on and off the AC power to the IF Monopulse Receiver heater. See TABLE 10 – HEATER CONTROL SIGNAL DESCRIPTIONS for the characteristics of the heater control signals to the IF Monopulse Receiver.

The RF Receiver heater control circuit will provide AC power to the IF Monopulse Receiver when the current thermistor resistance is above the nominal value of 746 Ω at 60º C. The current thermistor has a nominal value of 3000 Ω at 25º C. A 700 Ω resistance across the SENSE+ and SENSE- terminals will prevent AC power from being applied in a non-failure RF Receiver heater control circuit mode. The current IF Monopulse Receiver contains a 60 Ω heater element that is heated when AC power is applied.

The use of the 120 V Heater AC power by the IF Monopulse Receiver is not required if the design is able to meet requirements over the normal temperature operating range defined in section 2.9 Environmental.

[IF-RCVR-SPEC-0070] The IF Monopulse Receiver must receive the 120 V Heater AC power and Heater Neutral ground from the RF Receiver.

[IF-RCVR-SPEC-0071] The IF Monopulse Receiver must use the 120 V Heater AC power for temperature control purposes only.

[IF-RCVR-SPEC-0072] The IF Monpulse Receiver must use a maximum power of 120 watts RMS from the 120 V Heater AC power when AC power is required.

[IF-RCVR-SPEC-0073] The IF Monopulse Receiver must receive the SENSE+ and SENSE- signals from the RF Receiver.

[IF-RCVR-SPEC-0074] The IF Monopulse Receive must provide a resistive circuit between the SENSE+ and SENSE- signals to turn off the AC power when AC power is not required.

[IF-RCVR-SPEC-0075] The IF Monopulse Receiver must provide circuit protection when the 120 V Heater AC power is received when AC power is not required.

TABLE 10 – HEATER CONTROL SIGNAL DESCRIPTIONS

Signal Name Description I/O Destination Heater AC 120 V 60 Hz AC Power I RF Receiver Heater Neutral 120 V 60 Hz AC Neutral O RF Receiver SENSE+ Positive side input pin to the thermistor or resistive circuit I RF Receiver SENSE- Negative side output from the thermistor or resistive circuit O RF Receiver

2.6 Power and Ground

The IF Monopulse Receiver will be supplied power by two Lambda LYS-XV-15-40508-2 DC power supplies that are capable of driving 8 amps each. The two power and two ground return wires are connected to terminal boards TB2 and TB3. See FIGURE 18 - DC POWER SUPPLY AND GROUND PATH.

[IF-RCVR-SPEC-0076] The IF Monopulse Receiver must use a +15 V DC and a -15 V DC power supply for its source of power.

[IF-RCVR-SPEC-0077] The IF Monopulse Receiver must draw a maximum 2.4 amps from the +15 V DC power supply.

[IF-RCVR-SPEC-0078] The IF Monopulse Receiver must draw a maximum 2.0 amps from the -15 V DC power supply.

[IF-RCVR-SPEC-0079] The IF Monopulse Receiver’s power interface must filter emissions on the power cabling as to not exceed 60 dBuV to prevent emissions disturbing the rest of the system, per MIL-STD- 461F, subsection CE102. Verification can be performed by analysis and review of schematics.

FIGURE 18 - DC POWER SUPPLY AND GROUND PATH

2.7 Cabling

The current IF Monopulse Receiver connects to the Mode S Interrogator W38, W39, W40, W41, W42, W54, W59, and Power/Ground cables. The demarcation for the IF Monopulse Receiver cabling is at the current connector locations. Depending on the IF Monopulse Receiver footprint, additional cabling may be required to connect the IF Monopulse Receiver to the current cabling. See FIGURE 19 – IF MONOPULSE

RECEIVER CABLING DIAGRAM.

FIGURE 19 – IF MONOPULSE RECEIVER CABLING DIAGRAM

The current IF Monopulse Receiver contains seven J1 through J7 SMA connectors on its top. From these connectors, the 60 MHz IF input signals ER/A1IF, ERB1IF, ER/IFTEST, and ER/OMEGAIF are received and the log video output signals ER/AUXLGSG, ER/AUXLOG, and ER/LOGOMEG are provided. See FIGURE 20

- CURRENT IF MONOPULSE RECEIVER TOP CONNECTORS.

FIGURE 20 - CURRENT IF MONOPULSE RECEIVER TOP CONNECTORS

[IF-RCVR-SPEC-0080] The IF Monopulse Receiver solution must include any additional cabling to connect to the current W38, W39, W40, W41, W42, W54, W59, and Power/Ground cables.

[IF-RCVR-SPEC-0081] The IF Monopulse Receiver must have female SMA connectors J1 through J7 to receive or output the ER/A1IF, ER/IFTEST, ER/B1IF, ER/OMEGAIF, ER/LOGOMEG, ER/AUXLOG, and ER/AUXLGSG signals, respectively.

[IF-RCVR-SPEC-0082] The IF Monopulse Receiver ER/A1IF J1 port must connect to the W38 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0083] The IF Monopulse Receiver ER/IFTEST J2 port must connect to the W54 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0084] The IF Monopulse Receiver ER/B1IF J3 port must connect to the W39 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0085] The IF Monopulse Receiver ER/OMEGAIF J4 port must connect to the W40 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0086] The IF Monopulse Receiver ER/LOGOMEG J5 port must connect to the W41 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0087] The IF Monopulse Receiver ER/AUXLOG J6 port must connect to the W42 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0088] The IF Monopulse Receiver ER/AUXLGSG J7 port must connect to the W41 cable at its current location in the Mode S Interrogator.

The current IF Monopulse Receiver contains three J16 through J18 SMA connectors for use as test points that provide the ER/A1TP, ER/B1TP, and ER/OMEGATP 60 MHz signals. See FIGURE 21 - CURRENT IF

MONOPULSE RECEIVER TEST POINT CONNECTORS.

[IF-RCVR-SPEC-0089] The replacement IF Monopulse Receiver must have female SMA connectors J16 through J18 identified for the ER/OMEGATP, ER/B1TP, and ER/A1TP signals, respectively.

FIGURE 21 - CURRENT IF MONOPULSE RECEIVER TEST POINT CONNECTORS

The bottom of the current IF Monopulse Receiver contains three J8, J9, and J11 SMA connectors that provide the ER/LOGDELT and ER/LOGSIGM log video, and the ER/MPLSVID monopulse video signals. The J10 DB-9 connector provides the power and ground path. The J15 connector provides the heater power and temperature sensor signals. See FIGURE 22 - CURRENT IF MONOPULSE RECEIVER BOTTOM

CONNECTORS.

[IF-RCVR-SPEC-0090] The IF Monopulse Receiver must have female SMA connectors J8, J9, and J11 for the ER/LOGDELT, ER/LOGSIGM, and ER/MPLSVID signals, respectively.

[IF-RCVR-SPEC-0091] The IF Monopulse Receiver ER/LOGDELT J8 port must connect to the W41 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0092] The IF Monopulse Receiver ER/LOGSIGM J9 port must connect to the W41 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0093] The IF Monopulse Receiver ER/MPLSVID J11 port must connect to the W41 cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0094] The IF Monopulse Receiver must have a female DB-9 J10 connector for power and ground.

[IF-RCVR-SPEC-0095] The IF Monopulse Receiver DB-9 J10 connector must connect to the power and ground cable at its current location in the Mode S Interrogator.

[IF-RCVR-SPEC-0096] The IF Monopulse Receiver must accept the AC power and ground signals from the RF Receiver used for heating.

[IF-RCVR-SPEC-0097] The IF Monopulse Receiver must output the temperature signals to the RF Receiver.

[IF-RCVR-SPEC-0098] The IF Monopulse Receiver DB-9 J15 connector must connect to the W59 cable at its current location in the Mode S Interrogator.

FIGURE 22 - CURRENT IF MONOPULSE RECEIVER BOTTOM CONNECTORS

See FIGURE 23 - MODE S INTERROGATOR CABLES for length and connector information for cables connected to the current IF Monopulse Receiver.

FIGURE 23 - MODE S INTERROGATOR CABLES

2.7.1 Heater and Temperature Sensor Cable

The W59 cable provides the IF Monopulse Receiver 120 V AC Power and temperature sensing ports.

[IF-RCVR-SPEC-0099] The J15 connector must be a female ITT Cannon DE24567 or equivalent connector using the pinout defined in TABLE 11 – HEATER AND TEMPERATURE CABLE PINOUT.

TABLE 11 – HEATER AND TEMPERATURE CABLE PINOUT

D Subminiature Female Connector Pins to DE24567 Connector (A5J10)

D Subminiature Male Connector Pins to IF Coupler Module

Pin Number Signal Name Pin Number Signal Name 1 Open 1 Open 2 Open 2 Open 3 Open 3 Open 4 Open 4 Open 5 Open 5 Open 6 Heater AC 6 Heater AC 7 Heater Neutral 7 Heater Neutral 8 Sense+ 8 Sense+ 9 Sense- 9 Sense-

2.7.2 Power and Ground Cable

The A5J10 cable provides the IF Monopulse Receiver +15 V DC, -15 V DC power, and two ground returns.

[IF-RCVR-SPEC-0100] The IF Monopulse Receiver J10 connector must connect to the A5J10 cable to receive power and ground.

[IF-RCVR-SPEC-0101] The J10 connector must be a female ITT Cannon DE24567 or equivalent connector using the pinout defined in TABLE 12 - DC POWER CABLE PINPUT.

TABLE 12 - DC POWER CABLE PINPUT

D Subminiature Female Connector Pins to DE24567 Connector (A5J10)

D Subminiature Male Connector Pins to IF Coupler Module

Pin Number Signal Name Pin Number Signal Name

1 +15 V DC 1 +15 V DC

2 Ground 2 Ground

3 -15 V 3 -15 V DC

4 Ground 4 Ground 5 Open 5 Open 6 Open 6 Open 7 Open 7 Open 8 Open 8 Open 9 Open 9 Open

2.8 Mechanical

The current IF Monopulse Receiver is mounted on a metal plate on the left-hand side of the Mode S Interrogator Cabinet. See FIGURE 24 - MODE S INTERROGATOR CABINET.

FIGURE 24 - MODE S INTERROGATOR CABINET

The IF Monopulse Receiver mounting plate is 15.68” long and 20.81” high. The current IF Monopulse Receiver is 12.36” long, 2.14” wide, and 20.81” high. See FIGURE 25 - CURRENT IF MONOPULSE RECEIVER

MECHANICAL LAYOUT.

FIGURE 25 - CURRENT IF MONOPULSE RECEIVER MECHANICAL LAYOUT

When mounted, the width of the current IF Monopulse Receiver is projected in the horizontal direction.

There are components approximately 5 inches from the mounting plate in the horizontal direction. See

FIGURE 26 - INTERROGATOR CABINET HORIZONTAL CLEARANCE.

FIGURE 26 - INTERROGATOR CABINET HORIZONTAL CLEARANCE

[IF-RCVR-SPEC-0102] The replacement IF Monopulse Receiver must be a maximum 12.36” wide, 3” deep, and 20.81” high.

[IF-RCVR-SPEC-0103] The replacement IF Monopulse Receiver must contain and be mounted on a new mounting plate.

[IF-RCVR-SPEC-0104] The new mounting plate must have the same dimensions as the current mounting plate.

[IF-RCVR-SPEC-0105] The replacement IF Monopulse Receiver must have flanges so that it can be mounted on the mounting plate located in its current location in the Interrogator Cabinet.

See FIGURE 27 – IF MONOPULSE RECEIVER PLATE BOTTOM and FIGURE 28 – IF MONOPULSE RECEIVER

COVER.

FIGURE 27 – IF MONOPULSE RECEIVER PLATE BOTTOM

FIGURE 28 – IF MONOPULSE RECEIVER COVER

[IF-RCVR-SPEC-0106] This IF Monopulse Receiver Specification references the FAA-G-2100H, Electronic Equipment General Requirements, Paragraph 3.2.1.2 non-operating conditions. When delivered to the government, the IF Monopulse Receiver must be packaged for storage, shipping, or transporting (non-operating) to withstand the following environmental conditions:

a. Temperature -50°C to +56°C.

b. Relative humidity of 0% to 100% including condensation due to temperature changes.

c. Altitude 0 ft. to 50,000 ft. above sea level.

[IF-RCVR-SPEC-0107] The following gain and DC offset adjustors must be accessible from the front of the IF Monopulse Receiver to perform adjustments:

a. ER/MPLSVID Gain Adjustors

b. ER/MPLSVID DC Offset Adjustors

c. ER/LOGSIGM Gain Adjustors

d. ER/LOGSIGM DC Offset Adjustors

e. ER/LOGDELT Gain Adjustors

f. ER/LOGDELT DC Offset Adjustors

g. ER/AUXLGSG Gain Adjustors

h. ER/AUXLGSG DC Offset Adjustors

i. ER/AUXLOG Gain Adjustors

j. ER/AUXLOG DC Offset Adjustors

k. ER/LOGOMEG Gain Adjustors

l. ER/LOGOMEG DC Offset Adjustors

[IF-RCVR-SPEC-0108] The gain and DC offset adjustors must contain an adjustment knob that does not require tools.

[IF-RCVR-SPEC-0109] Descriptive markings must be provided to discern the function and path of each offset adjustment knob.

[IF-RCVR-SPEC-0110] The descriptive markings must be visible when the IF Monopulse Receiver is installed in the Mode S.

[IF-RCVR-SPEC-0111] The adjustor knobs must be able to be locked into position.

2.9 Environmental

[IF-RCVR-SPEC-0112] The replacement IF Monopulse Receiver must be installed in the Mode S Interrogator Cabinet, which is located in a stationary, indoor, temperature-controlled environment with minimal vibration. During normal operation, the inside of the Mode S Interrogator Cabinet is cooled by fans circulating air from the bottom to the top of the cabinet.

[IF-RCVR-SPEC-0113] This IF Monopulse Receiver Specification references the FAA-G-2100H, Electronic Equipment General Requirements, Paragraph 3.2.1.1.3 environmental conditions. The IF Monopulse Receiver must operate in an indoor environment in accordance with:

a. Elevation from sea level: -300 ft. to +10,000 ft.

b. Temperature and humidity of unmanned or unattended facility and storage or equipment areas of any facility: 0º F to +100 ºF, uncontrolled humidity.

c. Temperature and humidity of manned or attended facilities: +55º F to +85º F with relative humidity of 30% to 80% in the defined temperature range.

[IF-RCVR-SP…