Purchase Description Rev B.pdf

TEMOD-23-02

Revision: B

7 August 2024

PURCHASE DESCRIPTION

FOR THE

TEST SET, RADIO:

AN/PRM-37

Prepared by:

Product Director, Test, Measurement, and Diagnostic Equipment Bldg 3651, Army TACMS Drive

Redstone Arsenal, Alabama 35898-5000

Distribution Statement A: Approved for public release; distribution is unlimited.

Distribution Statement A

1.0 GENERAL INFORMATION.

The Radio Test Set (RTS) and its accessories are used to provide diagnostic capability to accurately test Frequency Modulated (FM) radio communication system parameters of receiver sensitivity, receiver squelch, forward and reverse power and frequency measurements over a range of 30 Megahertz (MHz) to 512 MHz of Single Channel Ground and Airborne Radio System family of radios, ARC-186, ARC-201, GRC-245, PRC-148, PRC-150, and PSC-5 radios. It will be primarily a battery operated, portable, lightweight tester for operation in unprotected and uncontrolled weather conditions.

1.1 Acquisition Process.

Product Director Test, Measurement, and Diagnostic Equipment will be utilizing a Best Value with Bid Samples acquisition process. This procurement will result in a firm-fixed-price, multiple year, indefinite delivery – indefinite quantity contract.

NOTE: This is not a solicitation and does not obligate the Government to issue a solicitation.

1.2 Order of Precedence.

In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence, unless otherwise indicated. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

2.0 OPERATIONAL REQUIREMENTS.

The specifications provided below are the minimum requirements and accuracies that will meet the Government’s need. The RTS shall at least meet these requirements and accuracies and may provide better performance.

2.1 Measurement Characteristics.

2.1.1 Frequency Range: 30 MHz through 512 MHz

2.1.1.1 Accuracy: ± 2 kilohertz (kHz) across the entire frequency range

2.1.2 Forward Power: 1 Watt (W) to 50 W

2.1.2.1 Accuracy: ± 20%

2.1.3 Reverse Power: 1 W to 20 W

2.1.3.1 Accuracy: ± 20%

2.1.3.2 Reverse Power Protection: maximum power being measured (i.e. 60 W)

2.1.3.3 Warning: display, via the electronic display, a warning message to the user that reverse power protection has been enabled

NOTE: This is to provide protection to the RTS itself in case the antenna port is left open or the antenna is shorted causing a full reflection of power back into the RTS.

2.1.4 Sensitivity/Squelch: shall check the receiver and squelch sensitivity of a radio under test in accordance with (IAW) the following subparagraphs:

2.1.4.1 Receiver Tests: output FM radio carrier frequencies from 30 MHz to 512 MHz spaced 5 MHz apart and shall interconnect with the radio receiver under test via a cable from the RTS to the antenna connector of the radio under test

2.1.4.1.1 Output Frequency Accuracy: each radio frequency (RF) output shall be ± 2 kHz

2.1.4.1.2 Output Level: RF output at a level of -97 power ratio in decibels (dBm) to test the receiver sensitivity, while being frequency modulated with both 900 Hertz (Hz) and 150 Hz tones

2.1.4.1.3 Output Level Accuracy: ± 3 dBm over the frequency range of 30 MHz through 512 MHz

2.1.4.2 Modulating Tones

2.1.4.2.1 900 Hz Tone: 900 Hz frequency modulating tone to test the receiver sensitivity of the radio under test

2.1.4.2.2 150 Hz Tone: 150 Hz frequency modulating tone to test the receiver squelch circuits of the radio under test

2.1.4.2.3 Accuracy: ± 2 Hz with a minimum composite FM deviation of ±1.75 kHz and a maximum composite FM deviation of ±3.5 kHz for each carrier frequency

2.1.5 Voltage Standing Wave Ratio (VSWR): measure, calculate, and visually display VSWR

2.1.5.1 Coupler Directivity: 20 dB

2.2 Physical Characteristics.

2.2.1 Connectors: Two (2) Bayonet Neill-Concelman (BNC) female (F) connectors

2.2.1.1 BNC One: connect the RTS to the RF output of the receiver-transmitter of the unit under test

2.2.1.2 BNC Two: connecting the RTS to a vehicular antenna, a 50-ohm flexible antenna, and a 50-ohm load

2.2.1.3 Protection: protected so that a drop in any orientation from a height of 36 inches (91.4 centimeter [cm]) shall not damage the connectors

2.2.2 Accessories

2.2.2.1 Adapters: two (2) L-shaped BNC male (M) to BNC F adapters

2.2.2.2 Load: a BNC F 50-ohm coaxial load with a power rating of 50 W with a 20% duty cycle per hour

2.2.2.3 Cables: two (2) 48-inch RG-58C/U coaxial cables each with BNC M connectors on both ends

2.2.2.4 Stowage: all accessories shall be stored in the hard transit case

2.2.3 Buttons: minimum a power button

2.3 Display Characteristics.

2.3.1 Test Results: numerically display test results by means of an electronic display to the operator

2.3.1.1 Resolution

2.3.1.1.1 Frequency: minimum of 6 digits of resolution

2.3.1.1.2 Power: minimum of 3 digits of resolution with at least one digit in the tenths position

2.3.1.2 Units

2.3.1.2.1 Frequency: MHz

2.3.1.2.2 Power: W

2.3.2 Visibility: display and all keys, buttons, and switches that are used to operate the RTS shall be visible for use in both dark and direct sunlight, outside environments

2.3.2.1 Adjustability: RTS’ display shall have a manually adjustable range from the brightest setting to off

2.3.3 Low Battery Warning: display an indication of a low battery status

2.4 Operational Characteristics.

2.4.1 Cold Weather Operation: Operators and maintainers wearing Army issue cold weather equipment, as defined in Field Manual (FM) 31-70, can use the controls and perform the functions required to operate the RTS.

2.4.2 Nuclear, Biological, and Chemical (NBC) Operation: Operators and maintainers wearing Army issue NBC Mission Oriented Protective Posture (MOPP), Level 2 equipment, as defined in FM 3-11.4, Table IV-6 “MOPP Level 2”, can use the controls and perform the functions required to operate the RTS.

2.4.3 NBC Storage: An operator and maintainer can properly shutdown and store the RTS while wearing their field duty uniform and Army issue NBC MOPP, Level 4 equipment, as defined in FM 3-11.4, Table IV-6 “MOPP Level 4.”

3.0 GENERAL REQUIREMENTS.

The RTS shall meet the requirements of the Military Performance Specification (MIL- PRF) 28800G titled, “Test Equipment For Use With Electrical and Electronic Equipment, General Specification For”, dated 17 November 2021, paragraphs 3 “REQURIEMENTS” and 4 “VERIFICATION” unless otherwise tailored by this Purchase Description.

3.1 Equipment Sample Requirements: All paragraphs of 3.1 “Equipment sample requirements” are applicable as written. The particulars of the requirements are in the

Test Set, Radio: AN/PRM-37/U Request for Proposal and Table 1 of this Purchase Description.

3.2 Equipment Components: All paragraphs of 3.2 “Equipment components” are applicable as written, except for paragraph 3.2.4.1 “Material restricted for Navy use”.

3.3 Design and Construction: All paragraphs of 3.3 “Design and Construction” are applicable as written.

3.4 Cybersecurity: All paragraphs of 3.4 “Cybersecurity” are applicable as written.

The particulars of the requirement are in the Test Set, Radio: AN/PRM-37/U Request for Proposal and as follows:

3.4.1 Operating System (OS): The OS shall have non-essential capabilities disabled or be configurable only by privileged users to enable/disable non-essential capabilities

3.4.1.1 OS Version: The RTS shall use a current operating system with all applicable security updates applied. Systems shall be maintained at a supported servicing level or release.

3.4.1.2 Protocols and Services: All unnecessary or unused protocol/service ports shall be disabled; wherever possible, File Transfer Protocol and Telnet shall be disabled

3.4.1.3 Wireless Access: Wireless access services (Wi-Fi, Bluetooth) shall not be enabled

3.4.1.4 Software Version: The software version delivered shall be the latest version of software installed at the time of delivery

3.4.1.5 Software / Firmware Upgradeability: The software / firmware shall be upgradeable at any time post-delivery to the latest versions available

3.5 Digital Control Interface: paragraph 3.5 “Digital control interface” is not applicable.

3.6 Electrical Power Sources and Connections: All paragraphs of 3.6 “Electrical power sources and connections” are applicable as written for battery-powered equipment with the following tailoring:

3.6.1 Sole Power Source: battery(ies)

3.6.1.1 Battery Operating and Recharge Time: shall operate a minimum of 12 hours and take no longer than four (4) hours to recharge, if applicable.

3.6.1.2 Battery Conservation: The RTS shall power down after an inactive period, not to exceed ten (10) minutes.

3.6.1.3 Battery Life Expectancy: Each RTS rechargeable battery shall have a battery life expectancy of no less than 500 charge and discharge cycles, if applicable.

3.6.1.4 Battery Charger: paragraph 3.6.2.8 “Battery charger” is applicable, if rechargeable battery(ies) are used

3.6.1.5 Battery Compartment: paragraph 3.6.2.9 “Battery compartment” is applicable.

3.6.1.6 Battery Quantity: The RTS shall be provided with a minimum of two (2) battery sets that are overpacked in the hard transit case.

3.6.1.7 Shelf Life: stored for up to 12 months with no deterioration of performance.

3.6.2 Internal DC Power Source: If batteries are provided for memory retention of constants, they shall have a useful life of at least 12 months under normal operating conditions within the operating and non-operating temperature range.

3.6.3 Excessive Current Drain Protection: If fuses are used as the safety mechanism the following will apply:

3.6.3.1 Holders: Common or separate fuse holders may be provided. If only one fuse holder is used (common), the equipment shall be provided with the 115 Volts Alternate Current (VAC) fuse installed and the 230 VAC fuse shall be stowed with the accessories.

3.6.3.2 Availability: The fuses shall be standard fuses available through commercial sources.

3.6.3.3 Rating Marking: The fuse rating shall be indicated near or on the fuse holder.

3.6.3.4 Quantity: Two (2) of each fuse that is required for complete operation, besides that installed in the equipment fuse holder, will be over-packed with the unit when delivered.

3.7 Enclosure Physical Characteristics: All paragraphs of 3.7 “Enclosure physical characteristics” are applicable as written with the following tailoring:

3.7.1 Dimensions: less than or equal to 3.5 inches in height, less than or equal to

4.5 inches in width, and less than or equal to 8.5 inches in depth (≤ 3.5” H x ≤ 4.5” W x ≤ 8.5” D)

3.7.2 Weight: The RTS shall weigh a maximum of four (4) pounds. The loaded transit case and accessories shall weigh a maximum of 12 pounds.

3.7.3 Stacking Provisions: paragraph 3.7.4.3 “Stacking provisions” is not applicable to the RTS.

3.7.4 Handles: paragraph 3.7.4.5 “Handles” is not applicable to the RTS.

3.8 Transit Case: All paragraphs of 3.8 “Transit case” are applicable as written with the following tailoring:

3.8.1 Transit Case Type: shall be hard and watertight/airtight.

3.8.2 Transit Case Stacking Provisions: minimum stacking height of 6 transit cases.

3.8.3 Color: Neutral in color (e.g. desert tan, olive green, black), excluding white.

3.8.4 Shelf Life: The RTS shall be able to be stored for up to 12 months with no deterioration of performance.

3.9 Environmental Requirements: All paragraphs of 3.9 “Environmental requirements” are applicable as written for Class 2 equipment per Table II “Environmental requirements by class” with the following tailoring:

3.9.1 Temperature and Humidity: paragraph 3.9.2 “Temperature and humidity” is applicable with the following modifications:

3.9.1.1 Not Operating Temperature: paragraph 3.9.2.1 “Temperature, not operating” temperature range is –55 degrees Celsius (°C) to +85°C

3.9.1.2 Operating Temperature: paragraph 3.9.2.2 “Temperature operating” temperature range is -20°C to +50°C

3.9.1.3 Humidity: paragraph 3.9.2.3 “Humidity” is applicable.

3.9.2 Altitude: paragraph 3.9.3 “Altitude” is applicable for both operating and non-operating altitude.

3.9.3 Vibration: paragraph 3.9.4 “Vibration” is applicable except for loose cargo bounce.

3.9.4 Mechanical Shock: paragraph 3.9.5 “Mechanical shock” is applicable except for high-impact shock.

3.9.5 Water Resistance: paragraph 3.9.6 “Water resistance” is not applicable except for paragraph 3.9.6.3 “Drip-proof” for the RTS and the transit case.

NOTE: Drip-proof testing shall be conducted on both the RTS and the transit case.

3.9.6 Fungus Resistance: paragraph 3.8.7 “Fungus resistance” is applicable.

The test items are the RTS, the transit case (interior and exterior), all accessories, labels, and adhesives.

3.9.7 Salt Atmosphere: paragraph 3.9.8 “Salt atmosphere” is applicable, except for structural exposure.

3.9.8 Explosive Atmosphere: paragraph 3.9.9 “Explosive atmosphere for class 1 equipment” is not applicable.

3.9.9 Dust Exposure: paragraph 3.9.10 “Dust exposure for class 1 equipment and hard transit cases” is applicable for the transit case.

3.9.10 Magnetic Environment: paragraph 3.9.11 “DC field (Navy) magnetic environment,” is not applicable.

3.9.11 Acoustic Noise: paragraph 3.9.12 “Acoustic noise” is applicable.

3.9.12 Solar Radiation: paragraph 3.9.13 “Solar radiation” is applicable.

3.10 Electromagnetic Compatibility: paragraph 3.10 “Electromagnetic compatibility (EMC)” is applicable.

3.11 Safety: paragraph 3.11 “Safety” is applicable.

3.12 Marking and Identification: All paragraphs of 3.12 “Marking and identification” are applicable as written with tailoring found in the Test Set, Radio:

AN/PRM-37/U Request for Proposal and Statement of Work.

3.13 Calibration: The following shall be used instead of MIL-PRF-28800G, paragraph 3.13 “Calibration interval”.

3.13.1 Ease of Access, Adjustment, and Removal: The RTS shall have easy access to the interior parts, terminals, and wiring for adjustments, and required circuit checking. Adjustments must not require the removal of any component, printed circuit card, or subassembly excluding installing extender boards. Printed circuit cards must be removable without the need to unsolder cables and interconnecting wiring. Printed circuit cards (mother boards) designed primarily to distribute power and signals to other printed cards (daughter boards) are excluded from this requirement. When such motherboards are used, they shall be accessible from both sides. Unsoldering of wires, wire harnesses, parts or subassemblies shall not be required to gain access to terminals, soldered connections, mounting screws and the like for calibration purposes. The use of extender cards or cables is permitted.

3.13.2 Variable Value Adjustments: Calibration shall be provided for by variable value components adjustable by means of means of tools contained in the SC 5180-91- R63 tool kit, by variable parameters stored in non-volatile memory, or by other simple means.

3.13.3 Calibration by Substitution: The calibration of a unit by substitution of selected components or parts is unacceptable.

3.13.4 Calibration Interval: shall maintain tolerance specifications for no less than 360 days.

3.13.5 Calibration Time: Calibration shall have a Mean Time To Calibrate that does not exceed nine (9) hours for a manual calibration and five (5) hours for an automated calibration. Calibration time does not include the time to repair and re-adjust the equipment because of malfunction.

3.14 Reliability: paragraph 3.14 “Reliability” is applicable with 2,700 hours of Mean Time Between Essential Function Failure. The Median Time to Repair for all Unscheduled Maintenance Demands (UMDs) at the field level shall not exceed 1.5 hours. The Maximum Time to Repair shall not exceed two (2) hours for 90% of all UMDs at field level.

3.15 Maintainability: all paragraphs of 3.15 “Maintainability” are applicable with the following tailoring:

3.15.1 Fault Isolation: paragraph 3.15.1 “Fault isolation” is applicable except permit isolation of faults and repair down to the board level.

3.15.2 Washability: paragraph 3.15.4 “Washability” is not applicable.

3.16 Environment Stress Screening: paragraph 3.16 “Environmental stress screening (applicable to class 1 only)” is not applicable.

3.17 Manuals: paragraph 3.17 “Use and installation manual and maintenance and service manual” are IAW the Test Set, Radio: AN/PRM-37 Request for Proposal and Statement of Work.

4.0 REQUIREMENT VERIFICATION MATRIX.

4.1 Definitions

4.1.1 Methods of Verification

4.1.1.1 Analysis: An element of verification that utilizes established technical or mathematical models or simulations, algorithms, charts, graphs, circuit diagrams, or other scientific principles and procedures to provide evidence that state requirements were met. The notation “X” in “Verification Method” column labeled “1” of Table 1 indicates requirement verification by analysis.

4.1.1.2 Demonstration: An element of verification which generally denotes the actual operation, adjustment, or re-configuration of items to provide evidence that the designed functions were accomplished under specific scenarios. The items may be instrumented and quantitative limits of performance monitored. The notation “X” in “Verification method” column labeled “2” of Table 1 indicates requirement verification by demonstration.

4.1.1.3 Examination: An element of verification consisting of investigation, without the use of special laboratory appliances or procedures, of items to determine conformance to those specified requirements which can be determine by such investigations. Examination is generally nondestructive and typically includes the use of sight, hearing, smell, and touch; simple physical manipulation; mechanical and electrical gauging and measurement; and other forms of investigation. The notation “X” in “Verification method” column labeled “3” of Table 1 indicates requirement verification by examination.

4.1.1.4 Test: An element of verification that generally denotes the determination, by technical means of the properties or elements of items, including functional operation, and involves the application of established scientific principles and procedures. The notation “X” in “Verification method” column labeled “4” of Table 1 indicates requirement verification by test.

4.1.2 Classes of Inspection

4.1.2.1 Bid Sample: Bid sample inspection is performed by the Government before contract award. The equipment should be a production unit normally provided by the manufacturer. The Government will use the results of the bid sample inspection to determine if contract award is appropriate. The notation “X” in “Verification Class” column labeled “A” of Table 1 indicates the inspection will take place during Bid Sample Inspection.

4.1.2.2 First Article: First article inspection is performed by the manufacturer after contract award. The equipment should be first production units. First article inspection is typically witnessed by the Government or a Government representative.

The Government reserves the right to witness the tests and perform any of the tests set forth herein where such testing is deemed necessary to ensure compliance with first article inspection. The notation “X” in “Verification Class” column labeled “B” of Table 1 indicates the inspection will take place during First Article Inspection (i.e.: Product Verification Testing).

4.2 Matrix

Table 1: Requirement/Verification Cross-Reference Matrix

METHOD OF VERIFICATION CLASSES OF INSPECTION

NA – NOT APPLICABLE

1 – ANALYSIS

2 – DEMONSTRATION

3 – EXAMINATION

4 – TEST

A – BID SAMPLE

B – FIRST ARTICLE

REQUIREMENTS

VERIFICATION

METHOD

VERIFICATION

CLASS

NA 1 2 3 4 A B

2.0 Operational Requirements X X X X X

2.1 Measurement Characteristics X

2.1.1 Frequency Range X X

2.1.1.1 Accuracy X X

2.1.2 Forward Power X X

2.1.2.1 Accuracy X X

2.1.3 Reverse Power X X

2.1.3.1 Accuracy X X

2.1.3.2 Reverse Power Protection X X

NA – NOT APPLICABLE

1 – ANALYSIS

2 – DEMONSTRATION

3 – EXAMINATION

4 – TEST

A – BID SAMPLE

B – FIRST ARTICLE

REQUIREMENTS

VERIFICATION

METHOD

VERIFICATION

CLASS

NA 1 2 3 4 A B

2.1.3.3 Warning X X

2.1.4 Sensitivity/Squelch X X

2.1.4.1 Receiver Tests X X

2.1.4.1.1 Output Frequency Accuracy X X

2.1.4.1.2 Output Level X X

2.1.4.1.3 Output Level Accuracy X X

2.1.4.2 Modulating Tones X X

2.1.4.2.1 900 Hz Tone X X

2.1.4.2.2 150 Hz Tone X X

2.1.4.2.3 Accuracy X X

2.1.5 Voltage Standing Wave Ratio

(VSWR) X X

2.1.5.1 Coupler Directivity X X

2.2 Physical Characteristics X

2.2.1 Connectors X X

2.2.1.1 BNC One X X

2.2.1.2 BNC Two X X

2.2.1.3 Protection X X

2.2.2 Accessories X

2.2.2.1 Adapters X X

2.2.2.2 Load X X

2.2.2.3 Cables X X

2.2.2.4 Stowage X X

2.2.3 Buttons X X

2.3 Display Characteristics X

2.3.1 Test Results X X

2.3.1.1 Resolution X

2.3.1.1.1 Frequency X X

2.3.1.1.2 Power X X

2.3.1.2 Units X

2.3.1.2.1 Frequency X X

2.3.1.2.2 Power X X

2.3.2 Visibility X X

2.3.2.1 Adjustability X X

2.3.3 Low Battery Warning X X

2.4 Operational Characteristics X

2.4.1 Cold Weather Operation X X

2.4.2 NBC Operation X X

2.4.3 NBC Storage X X

3.0 General Requirements X X X X X

3.1 Equipment Sample Requirements X X X X

NA – NOT APPLICABLE

1 – ANALYSIS

2 – DEMONSTRATION

3 – EXAMINATION

4 – TEST

A – BID SAMPLE

B – FIRST ARTICLE

REQUIREMENTS

VERIFICATION

METHOD

VERIFICATION

CLASS

NA 1 2 3 4 A B

3.2 Equipment Components X X

3.3 Design and Construction X X

3.4 Cybersecurity X X

3.4.1 OS X X

3.4.1.1 OS Version X X

3.4.1.2 Protocols and Services X X

3.4.1.3 Wireless Access X X

3.4.1.4 Software Version X X

3.4.1.5 Software / Firmware

Upgradeability X X

3.5 Digital Control Interface X

3.6 Electrical Power Sources and

Connections X X

3.6.1 Sole Power Source X X

3.6.1.1 Battery Operating and

Recharge Time X X X X

3.6.1.2 Battery Conservation X X

3.6.1.3 Battery Life Expectancy X X

3.6.1.4 Battery Charger X X

3.6.1.5 Battery Compartment X X

3.6.1.6 Battery Quantity X X

3.6.1.7 Shelf Life X X

3.6.2 Internal DC Power Source X X

3.6.3 Excessive Current Drain Protection X X

3.6.3.1 Holders X X

3.6.3.2 Availability X X

3.6.3.3 Rating Marking X X

3.6.3.4 Quantity X X

3.7 Enclosure Physical Characteristics X X

3.7.1 Dimensions X X

3.7.2 Weight X X

3.7.3 Stacking Provisions X

3.7.4 Handles X

3.8 Transit Case X X X

3.8.1 Transit Case Type X X X

3.8.2 Transit Case Stacking Provisions X X

3.8.3 Color X X

3.8.4 Shelf Life X X

3.9 Environmental Requirements X X

3.9.1 Temperature and Humidity X X

3.9.1.1 Not Operating Temperature X X

NA – NOT APPLICABLE

1 – ANALYSIS

2 – DEMONSTRATION

3 – EXAMINATION

4 – TEST

A – BID SAMPLE

B – FIRST ARTICLE

REQUIREMENTS

VERIFICATION

METHOD

VERIFICATION

CLASS

NA 1 2 3 4 A B

3.9.1.2 Operating Temperature X X

3.9.1.3 Humidity X X

3.9.2 Altitude X X

3.9.3 Vibration X X

3.9.4 Mechanical Shock X X

3.9.5 Water Resistance X X

3.9.6 Fungus Resistance X X

3.9.7 Salt Atmosphere X X

3.9.8 Explosive Atmosphere X

3.9.9 Dust Exposure X X

3.9.10 Magnetic Environment X

3.9.11 Acoustic Noise X X

3.9.12 Solar Radiation X X

3.10 Electromagnetic Compatibility X X

3.11 Safety

3.12 Marking and Identification X X

3.13 Calibration X X

3.13.1 Ease of Access, Adjustment, and

Removal X X

3.13.2 Variable Value Adjustments X X

3.13.3 Calibration by Substitution X X

3.13.4 Calibration Interval X X

3.13.5 Calibration Time X X

3.14 Reliability X X X

3.15 Maintainability X X

3.15.1 Fault Isolation X X

3.15.2 Washability X

3.16 Environmental Stress Screening X

3.17 Manuals X X X

5.0 ACRONYMS.

Table 2: Acronyms Acronym Definition

BNC Bayonet Neill-Concelman dBm Power ratio in decibels F female FM Field Manual FM Frequency Modulation

Table 2: Acronyms Acronym Definition

Hz Hertz IAW In Accordance With i.e. id est, in other words kHz kilohertz M male MHz Megahertz MIL-PRF Military Performance Specification MOPP Mission Oriented Protective Posture NBC Nuclear, Biological, and Chemical OS Operating System RF Radio Frequency RTS Radio Test Set UMD Unscheduled Maintenance Demand VAC Volts Alternate Current W Watt(s) °C degrees Celsius ± plus or minus % percent

4.2 Matrix