DD Form 1494 Prep Guide 07-06.doc

DD FORM 1494

PREPARATION GUIDE

19 July 2006

RF Spectrum Management Branch

AFMC/A6O

4225 Logistics Avenue, Room S-132

Wright-Patterson AFB, OH 45433-5714

PREFACE

This handbook is intended to provide the necessary information to prepare a DD Form 1494, “Application for Equipment Frequency Allocation.” This information is provided to AFMC program offices, customers, and their associated contract representatives. Improvements to this handbook are welcome and should be brought to the attention of the RF Spectrum Management Branch, AFMC/A6O, Wright-Patterson AFB, OH, (937) 656-0782.

TABLE OF CONTENTS

11 Introduction 1- 2 Spectrum Certification Process 2-1

3 DD FORM 1494

3-1

3.1 GENERAL INFORMATION

3-1

3.1.1 CLASSIFICATION

3-1

3.1.2 APPLICATION PURPOSE

3-1

3.1.3 DATA REQUIREMENT

3-1

3.1.4 STANDARDS

3-1

3.1.5 REMARKS ITEMS

3-1

3.1.6 ABBREVIATIONS

3-1

3.2 DOD GENERAL INFORMATION PAGE INSTRUCTIONS

3-1

3.3 TRANSMITTER EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

3-1

3.3 RECEIVER EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

3-1

3.5 ANTENNA EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

3-1

3.6 GENERAL CONTINUATION PAGE INSTRUCTIONS

3-1

3.7 NTIA GENERAL INFORMATION PAGE INSTRUCTIONS

3-1

3.8 FOREIGN COORDINATION GENERAL INFORMATION PAGE INSTRUCTIONS

3-1

APPENDIX A - TERMS AND DEFINITIONS

A-1

APPENDIX B – TABLE OF SERVICES, STATION CLASSES AND STATIONS

B-1 appendix c – station class definitions C-1

APPENDIX D – EMISSION DESIGNATORS

D-1

APPENDIX E – JOINT ELECTRONICS TYPE DESIGNATION SYSTEM

E-1

APPENDIX F – BLANK DD FORM 1494

F-1

APPENDIX G – SPECTRUM CERTIFICATION CLASSIFICATION WORKSHEET

G-1

APPENDIX H – SPACE SYSTEM DATA

H-1

1 Introduction

1.1 Spectrum certification, also referred to as spectrum allocation, is the process of examining equipment for use by or for the Department of Defense (DoD), to ensure spectrum support and adherence to national and military technical standards. Spectrum Certification is required on most RF radiating and/or receiving equipment purchased or developed by the DoD. The end result of this effort is certification of the system, which includes the Military Communications Electronics Board (MCEB) guidance which outlines any considerations, provisions, and restrictions that apply to a particular system. This process assists program offices and contractors in fielding an electromagnetic radiating and/or receiving device that can be based or deployed to the intended area of operation without significant impasse. DoD Directive 4650.1 states:

“DoD components shall obtain radio frequency guidance prior to assuming contractual obligations with respect to either the development or procurement of telecommunications equipment designed purposely to radiate or receive electromagnetic energy. Radio frequency guidance will also be obtained prior to assuming obligations for the selection, procurement, or development of earth or terrestrial station sites and facilities which will be used to support telecommunications equipment. This guidance will be obtained from the MCEB or the Office of Telecommunications Policy, executive Office of the President, in accordance with procedures issued by the MCEB.“

AFI 33-118 implements DoD directive 4650.1 through the DD Form 1494 process. Within CENTER, a Defense Federal Acquisition Regulation (DFAR) clause 252-235.7004 is added to all CENTER contracts. It states that contractors shall provide all necessary information for submittal of spectrum certification or frequency assignment to the CENTER RF Spectrum Management Branch.

1.2 Commercial off-the-shelf (COTS), government-furnished equipment (GFE) and non-developmental item (NDI) equipment are not exempt from the requirements for spectrum certification. GFE should not be assumed to be certified because it has a military nomenclature.

1.3 The following devices do not require certification as specified above:

a.

Electronic Fuses that remotely activate detonation devices.

b.

Bench testing of electronic components where items such as signal generators are used for low-powered modulation of a radio wave.

c.

Laser devices.

d.

Leased 800 MHz airborne radio telephone systems.

e.

Items owned and operated by contractors

1.4 Built-in-test equipment (BITE), and antenna testing equipment (typically spectrum analyzers and equivalent test equipment), used within the continental United States (CONUS), may not require spectrum certification; however the rules and regulatory guidance must be carefully checked prior to making an exclusion. All these devices must have their technical parameters registered with this office, and a frequency assignment issued prior to approval to radiate these devices.

1.5 The DD Form 1494 must be submitted early in the programming effort to ensure that spectrum guidance is received. Refer to Chapter 2, pages 2.2 and 2.3 for the time constraints when submitting the different stages of the DD Form 1494. The following chart show the basic process the certification application follows. Our office will provide you regular updates to let you know where your proposal is during its various phases.

Figure 1.1 Spectrum Certification Process

2 Spectrum Certification Process

2.1 As stated in paragraph 1.1, AFI 33-118 implements DoD Directive 4650.1 through the DD Form 1494 process. If the effort is one of developing a new device that transmits or receives electromagnetic energy, a completed DD Form 1494 (xxx) should be accomplished at each of the four milestones of equipment development -- conceptual, experimental, developmental, and operational. However, if the equipment is being acquired as fully capable (GFE, COTS, or NDI), or if it is a next-generation version (i.e., AN/APQ-XXX(V)7) of an equipment that was previously approved for operational deployment, the equipment shall be submitted as an operational stage (stage 4) application.

The process begins with the supplier (contractor), who fills out the equipment, waveform, airframe, and testing needs information and forwards it to the program office. The program office improves/adds information as necessary and sends it to the Center spectrum office. The Center spectrum office reviews the certification application and forwards it to Air Force Materiel Command (AFMC) for command validation, and then forwarded to the USAF Frequency Management Agency (AFFMA) for evaluating and processing with applicable members of the MCEB and the National Telecommunications Information Administration’s (NTIA) Interdepartmental Radio Advisory Committee (IRAC) Spectrum Planning Subcommittee (SPS). Processing through the SPS is done on select systems determined by the FMA and the MCEB.

2.2 The DD Form 1494 consists of a DoD General Information page, Transmitter Equipment Characteristics page(s), Receiver Equipment Characteristics page(s), Antenna Equipment Characteristics page(s), an NTIA General Information page, a Foreign Coordination page, and a continuation page(s) which provide more detailed explanations of the other pages or a Line Diagram. The Foreign coordination page is only completed when the equipment is to be deployed outside US&P. All other pages must be completed for each piece of equipment. Instructions for completing each page are included in Chapter 3.

2.3 The following tables indicate the stage of development, type of equipment, location of use and required time for submission:

SPECTRUM CERTIFICATION

WHEN CONSIDERING DEVELOPMENT OF OR MODIFICATION TO A DEVICE WHICH RADIATES ELECTROMAGNETIC ENERGY

conceptual

(stage 1)

SPECTRUM CERTIFICATION

WHEN CONSIDERING DEVELOPMENT OF OR MODIFICATION TO A DEVICE WHICH RADIATES ELECTROMAGNETIC ENERGY

experimental

(stage 2)

satellite required not less than six months prior to procuring equipment for experimentation

(see Note 1) an additional 60 days are required for processing by CENTER and HQ AFMC

an additional 60 days are required for processing by CENTER and HQ AFMC

an additional 45 days are required for processing by CENTER and HQ AFMC.

an additional 60 days are required for processing by CENTER and HQ AFMC

NOTE 1: Six months is based on having an approved previous paper. If this is the first application, one year is required.

SPECTRUM CERTIFICATION

WHEN CONSIDERING DEVELOPMENT OF OR MODIFICATION TO A DEVICE WHICH RADIATES ELECTROMAGNETIC ENERGY

NOTE 1: Six months is based on having an approved previous paper. If this is the first application, one year is required.

SPECTRUM CERTIFICATION

WHEN CONSIDERING DEVELOPMENT OF OR MODIFICATION TO A DEVICE WHICH RADIATES ELECTROMAGNETIC ENERGY

NOTE 1: Six months is based on having an approved previous paper. If this is the first application, one year is required.

3 DD FORM 1494

3.1 GENERAL INFORMATION

3.1.1 CLASSIFICATION

The DD Form 1494 must be classified in accordance with appropriate agency security directions. Downgrading instructions must be indicated. The highest classification for each item or sub-item as required must be indicated by a (U), (C), or (S) alongside the item or sub-item title, for classified applications. All classified proposals must be accompanied by a completed Spectrum Certification Classification Worksheet (Appendix G).

3.1.2 APPLICATION PURPOSE

This is an application for development or procurement of equipment with RF emitters. Funds must not be obligated prior to the approval of an application for frequency allocation. NOTE: The DD form 1494 process only provides frequencies guidance for the development or procurement. It does not provide frequencies for operation of the system. Frequency support must be submitted IAW AFI 33-118 and AFM 33-120.

3.1.3 DATA REQUIREMENT

All applicable data items shall be submitted for all stages. Estimated values or ranges of values may be submitted for stage 1 and 2 in the absence of calculated or measured values and be annotated (EST). Values for stage 3 must be either calculated or measured and stage 4 should be measured.

3.1.4 STANDARDS

Technical parameters of the application will be evaluated against the appropriate DoD, National and International EMC standards.

3.1.5 REMARKS ITEMS

Use the remarks item located at the bottom of each page of the form to amplify or clarify the entries. Add continuation pages as required.

3.1.6 ABBREVIATIONS

The following abbreviations are used in the development on the DD Form 1494:

Hertz Hz Microseconds usec kilohertz kHz Decibel dB

Megahertz MHz dB Isotropic dBi

Gigahertz GHz Pulses Per Second pps

Milliwatt mW Parts Per Million ppm

Watt W Peak Envelope Power

PEP

Nanoseconds nsec Not Applicable

NA

Not Available NAvail Occupied Bandwidth

OC-BW

National Telecommunications & Information Administration

NTIA

3.2 DOD GENERAL INFORMATION PAGE INSTRUCTIONS

OMB No. 0704-0188

FREQUENCY ALLOCATION

Page 1 of ____ Pages

DOD GENERAL INFORMATION

1. APPLICATION TITLE

2. SYSTEM NOMENCLATURE

3. STAGE OF ALLOCATION (x one)

a. STAGE 1 b. STAGE 2 c. STAGE 3 d. STAGE 4

CONCEPTUAL EXPERIMENTAL DEVELOPMENTAL OPERATIONAL

4. FREQUENCY REQUIREMENTS

a. FREQUENCY(IES)

b. EMISSION DESIGNATOR(S)

5. TARGET STARTING DATE FOR SUBSEQUENT STAGES

6. EXTENT OF USE

7. GEOGRAPHICAL AREA FOR

a. STAGE 2

b. STAGE 3

c. STAGE 4

8. NUMBER OF UNITS

9. NUMBER OF UNITS OPERATING SIMULTANEOUSLY IN THE SAME ENVIRONMENT

10. OTHER J/F 12 APPLICATIONS NUMBER(S) TO BE

a. SUPERSEDED J/F 12/

b. RELATED J/F 12/

11. IS THERE ANY OPERATIONAL REQUIREMENT AS DESCRIBED IN INSTRUCTIONS FOR PARAGRAPH 11?

a. YES b. NO c. NAvail

12. NAMES AND TELEPHONE NUMBERS

13. REMARKS

DD Form 1494, MAY 91

DOD PAGE INSTRUCTIONS

CLASSIFICATION: Enter the highest classification of all the pages contained in this DD Form 1494 package, and include any special instructions, restrictions, or limitations.

DATE: Enter the date the application is completed and ready for transfer to AFMC.

PAGE 1 OF__ PAGES:

Enter the total number of pages contained in the application.

TO: Enter the following address:

Air Force Frequency Management Agency

AFFMA/DON

2461 Eisenhower Avenue, Hoffman 1 Building

Alexandria, VA 22331-1500

FROM: Enter the following address:

AF Materiel Command

AFMC/A6OS

4225 Logistics Avenue, Room S-132

Wright-Patterson AFB, OH 45433-5714

ITEM 1. Application Title. Enter the government nomenclature of the equipment, i.e., AN/APX-100(V) Identification Friend or Foe (IFF) Set with Mode S Data Link or the manufacturer’s name, model number, and a short descriptive title (i.e., Wilcox 914A Air Traffic Control Radar Beacon System (ATCRBS) Transponder The Joint Electronics Type Designation System (JTEDS) should be used when available (See Appendix E). Also, an official program name should be included if possible. The application title must be unclassified, and the application title on the DoD General Information page, the NTIA General Information page, and Foreign Coordination pages must be identical.

ITEM 2. System Nomenclature. Enter the name or nomenclature of the system for which the specified device identified in the application title is a subsystem, capability, or upgrade, i.e., Global Air Traffic Management (GATM) System or

C-130/C-141/C-5 Avionics Modernization Program

The system nomenclature must be unclassified, and the system nomenclature on the DoD General Information page, the NTIA General Information page, and Foreign Coordination pages must be identical.

ITEM 3. Stage of Allocation. Mark the appropriate block using the following definitions.

Stage 1-Conceptual. The initial planning effort has been completed, including proposed frequency bands and other available characteristics. A conceptual certification is required prior to releasing funds for studies or assembling “proof-of-concept” testbeds. All planned or estimated characteristics should be entered on the DD Form 1494. Where information has not been determined enter “NAvail”. Conceptual stage equipment normally does not radiate.

Stage 2-Experimental. The preliminary design has been completed, and radiation, using test equipment or preliminary models, may be required. An experimental certification is required prior to the release of funds for building a radiating test model or assignment of a radio frequency for experimental use. Estimated and calculated data can be used for nearly all items on the DD Form 1494.

Stage 3-Developmental. The major design has been completed, and radiation may be required during testing. Measured data should be provided as much as possible. Information on the form should be available. Entries indicating that the information is “not available” should be an absolute minimum.

Stage 4-Operational. Development has been essentially completed and final operating constraints or restrictions needed to ensure compatibility need to be identified. Approval of an operational application is mandatory prior to release of funds for production units. Measured data should be provided for all technical characteristics. All pure COTS equipment (those whose RF characteristics have not been modified nor expanded) fit this stage of certification.

ITEM 4. Frequency Requirements.

· Enter the frequency range of operation. This should be the center frequency of the lowest channel to the center frequency of the highest channel over which the transmitter and receiver can be tuned. For equipment designed to operate only at a single frequency, enter the frequency of operation.

· Enter the emission designator(s) for each mode of operation, as described in Appendix D. If the system uses frequency agility, provide both the instantaneous bandwidth and the hopping bandwidth of each mode.

· Enter in item 13, “Remarks,” any information pertinent to frequency requirements, such as minimum frequency separation or special relationships involving multiple discrete frequencies.

ITEM 5. Target Starting Date for Subsequent Stages. Enter the proposed date of application submission for each subsequent stage. The target starting date for the stage of submission and previous stages must be listed as “NA.” The target starting date for stages subsequent to the stage of submission must allow time for processing prior to the anticipated contract award dates. Occasionally, equipment is developed that is never intended to be introduced into the operational inventory. It may be a proof-of-concept test bed or a one-of-kind piece of laboratory equipment. This is indicated on the DD Form 1494 by entering an “NA” for the Stage 4 date and an explanation in item 13. Required processing times are listed in the frequency allocation tables listed in paragraph 2-3.

ITEM 6. Extent of Use. Describe the extent of use that will apply to Stage 4 (operational use), e.g., continuous or intermittent. If intermittent, provide information including the expected number of hours of operation per day or other appropriate time period; scheduling capability; and any conditions governing the times of intermittent use, e.g., used only as required for calibration of test range equipment.

ITEM 7. Geographical Area. Enter the geographical location(s) or area(s) of use for this and subsequent stage(s),e.g., Gilfillan Plant, Los Angeles, California, and White Sands Missile Range, New Mexico (Stage 2); US&P (Stage 3); US&P, NATO Countries and Korea (Stage 4). Enter “NA” for the previous stages. All geographical locations in which the system will operate during the stage of the application being submitted and subsequent stages must be listed in detail. If insufficient room in the item block, provide the remaining locations in item 13 or on general continuation pages.

ITEM 8. Number of Units. Enter the total number of units planned for current stage requested and the subsequent stages. If the number of transmitters differs from the number of receivers, each should be identified and listed separately. Enter “NA” for the previous stages.

ITEM 9. Number of Units Operating Simultaneously in the Same Environment. Enter the maximum number of these units planned to be operating simultaneously in the same environment when operational (Stage 4). The environment is defined to be the physical area over which the equipment signal can communicate or interfere. For a fixed microwave radio, it will usually be two units: the transmitting station and the receiving station. In the case of a base police radio net, there may be dozens of land mobile radios within reception range of each other. A radar may have only one unit in its operating area.

ITEM 10. Other J/F 12 Application Number(s). Mark the appropriate block(s) and enter J/F 12 number(s) for superseded (previous applications for the same equipment) and/or related application(s) (equipment that this equipment works with).

ITEM 11. Operational Requirement. Mark the appropriate block if this equipment will operate with the same or similar equipment used by other US military services, DoD components, US government agencies or allied nations. Specify in item 13 (Remarks) other types of equipment with which this equipment will operate, if appropriate.

ITEM 12. Names and Telephone Numbers. Enter the name, office symbol and telephone number (both commercial and DSN) of the government program manager and the project engineer. The project engineer should be someone familiar with the RF parameters on the submitted DD Form 1494.

ITEM 13. Remarks. Enter any information that needs to be continued from an item listed above. When entering information, list the item number for which the information pertains. Realize that the readers of the application have a wide range of technical knowledge – make sure that the information provided is easy to understand. There is no limit to the number of continuation pages included. The security classification of any information contained in the “Remarks” block must be explicitly marked.

DOWNGRADING: Use the Spectrum Certification Classification Worksheet (Appendix G) to determine the correct downgrading instructions. Classification, reason, and review or downgrade instructions must be in accordance with Executive Order (EO) 12958.

3.3 TRANSMITTER EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

TRANSMITTER EQUIPMENT CHARACTERISTICS

9. FREQUENCY TOLERANCE

10. FILTER EMPLOYED (x one)

a. YES b. NO

11. SPREAD SPECTRUM (x one)

12. EMISSION BANDWIDTH (x and complete as applicable)

CALCULATED MEASURED

b. -20 dB

d. -60 dB

e. OC-BW

15. MAXIMUM MODULATION FREQUENCY

16. PRE-EMPHASIS (x one)

17. DEVIATION RATIO

18. PULSE CHARACTERISTICS

e. COMP RATIO

21. HARMONIC LEVEL

b. 3rd

23. FCC TYPE ACCEPTANCE

c. OTHER

24. REMARKS

CLASSIFICATION

TRANSMITTER EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

CLASSIFICATION: Enter the highest classification of all items on this page.

PAGE: Enter the page number.

ITEM 1. Nomenclature, Manufacturer’s Model No. Enter the Joint Electronics Type Designation System (JETDS) designator, followed by “Transmitter.” If there is no JETDS designator assigned enter the manufacturer’s model number, e.g., MIT 502 followed by “Transmitter.” If neither of the above options is available, enter a short descriptive title, e.g., Airborne UHF Transmitter. The JETDS designator should be used when available (See Appendix E).

ITEM 2. Manufacturer’s Name. Enter the manufacturer’s name. Enter any subcontractors in the remarks.

ITEM 3. Transmitter Installation. Identify the platform or object where the transmitter(s) will be installed, such as: “Aircraft,” “Missile,” “Ship,” “Spacecraft,” or “Fixed Site.”

ITEM 4.

Transmitter Type. Enter a two- or three-word descriptive generic class of transmitter, e.g., “Pulsed Doppler,” “Frequency Hopping Radar,” “IFF Transponder,” “AM Communications,” FM/BPSK Communications.”

ITEM 5. Tuning Range. Enter the frequency range that the transmitter is capable of being tuned, e.g., 225.000-399.975 MHz. This should be the lowest-tunable center radio frequency through the highest-tunable center-radio frequency of each frequency range that the system operates on. For equipment designed to operate only at a single frequency, enter the frequency of operation. Indicate units, e.g., kHz, MHz or GHz.

ITEM 6.

Method of Tuning. Enter the method of tuning by indicating the method of effecting change and device insuring frequency stability, e.g., “Fixed Crystal,” “Phase Locked Loop (PLL)”, “Crystal Synthesizer,” “Software Selectable,” or “Factory Tunable Magnetron.” If the equipment is not readily tunable in the field, indicate in item 24, “Remarks,” the complexity of tuning.

ITEM 7.

RF Channeling Capability. Describe the RF channeling capability. If the channels are uniformly spaced, enter the center frequency of the first channel and channel spacing i.e., “406.000 MHz, 100 kHz Increments.” If the tuning is of a continuous nature (in 1 kHz steps or less) enter the lowest frequency and the word “Continuous.” For others, such as HF Single Side Band or cases where channel selection is under software control, enter a detailed description in item 24. Any constraints on using any of these channels must be described in item 24 -- like degraded channels, internal hardwiring limitations, or lockout capability for frequency hopping systems. RF channeling does not include the net channels created by “Distributed Time Division Multiple Access (DTDMA),” but does include the actual RF band(s) occupied by those nets.

ITEM 8. Emission Designator(s). Enter the emission designator(s) for each mode of operation, as described in Appendix D. If the system uses frequency agility identify each mode as hopping or non-hopping (e.g. 64M0F3E (Hopping)). The necessary bandwidth part of the emission designator(s) must be reproducible. If the K (overall numerical factor which varies according to the emission and which depends upon the allowable signal distortion) varies from NTIA manual Annex J indicate the value and reason for variance.

ITEM 9. Frequency Tolerance. Enter the frequency tolerance, i.e., the maximum departure of a transmitter from its assigned frequency after normal warm-up time has been allowed. Indicate the units in parts per million (ppm) for all emission types except single sideband which shall be indicated in Hertz (Hz).

The equation above can be used to convert frequency drift in Hz to frequency tolerance in ppm. The center frequency must be specified in the same units as the frequency drift.

ITEM 10. Filter Employed. Mark the appropriate block to indicate whether a filter has been installed between the final RF stage and the antenna. If a filter is being used provide the characteristics to include: the filter type, insertion loss, and attenuation characteristics in item 24 For example: “A 3-pole LP Butterworth filter with 1.5 dB in-band insertion loss and a minimum of 85 dB attenuation at 25 MHz removed from the tuned radio frequency.”

ITEM 11. Spread Spectrum. This block indicates whether the transmitter can operate in a spread spectrum mode. Spread spectrum is defined by the Institute of Electrical and Electronics Engineers (IEEE) as “a modulation technique for multiple accesses, or for increasing immunity to noise and interference.” Spread spectrum systems make use of sequential noise link signal structures, for example, pseudonoise (PN) codes, to spread the normally narrowband information signal over a relatively wide band of radio frequencies. The principal spread spectrum methods are direct sequence, radio frequency hopping, and a hybrid of the two. Mark the appropriate block. If “Yes,” an explanation of the signal characteristics must be provided in item 24. Examples of amplifying information are: “Direct sequence pseudorandom noise is used to spread the bandwidth of the telecommand signal. Signal information rate = 14.6 kbits/sec and chip rate = 18.5 Mbits/sec” or “Frequency hopping is employed used 21 discrete software selected channels within the tuning range. The hop rate is 20 khops per second.”

ITEM 12. Emission Bandwidth. Enter the emission bandwidths for which the transmitter is designed at the -3, -20, -40, and -60 dB levels and the occupied bandwidth. The emission bandwidth is defined as that appearing at the antenna terminals and includes any significant attenuation contributed by filtering in the output circuit or transmission lines. Values of emission bandwidth specified should be indicated as calculated or measured by marking the appropriate block. Indicate units used, e.g., Hz, kHz, MHz. Note that the occupied bandwidth (item 12(e)) is defined as the frequency bandwidth such that, below its lower and above its upper frequency limits, the mean powers radiated are each equal to 0.5% of the total mean power radiated. Under no circumstances can the occupied bandwidth be less than the necessary bandwidth listed in item 8, “Emission Designator(s).” A complete set of bandwidths must be listed for each set of pulse characteristics (item 18). In addition, a complete set of emission bandwidths must be included for each different emission designator listed in item 8. For instance, a transmitter may be capable of transmitting both pulse Doppler and chirped FM emissions. In this case, two emission designators would be indicated in item 8, and two emission bandwidths must be listed in item 12 (no matter how many different emissions). Calculated values are acceptable for stages one through three; however, you must submit the method of calculation. Measured values must be submitted for stage 4 unless permission has been granted from AFFMA previously.

ITEM 13. Maximum Bit Rate. Enter the maximum information bit rate for digital equipment, in bits per second. If spread is used, enter the bit rate after encoding.

ITEM 14. Modulation Techniques and Coding. Enter the modulation techniques and coding. Describe in detail the modulation and/or coding techniques employed. For complex modulation schemes such as direct sequence spread spectrum, frequency hopping, frequency agile, etc., enter full details in item 24.

ITEM 15. Maximum Modulation Frequency. Enter the maximum modulation frequency for frequency or phase modulated transmitters. This frequency is assumed to be the frequency at -3 dB point on the high frequency side of the modulator response curve. In other words, it is the highest input frequency that can be successfully transmitted. In the case of a standard analog voice communications radio, the maximum modulation frequency is designed to be 3 kHz, the highest frequency the human voice normally produces in speech. In the case of a multi-channel, frequency-division multiplexed radio, the maximum modulation frequency is the highest frequency of the highest channel after being multiplexed. If the radio multiplexes 10 channels, and uses 3 kHz/channel, the highest modulation frequency is 10 x 3 kHz or 30 kHz. Indicate the units, e.g., Hz, kHz, or MHz.

ITEM 16. Pre-Emphasis. Enter the pre-emphasis. For frequency or phase modulated transmitters mark the appropriate block to indicate whether pre-emphasis is available. Pre-emphasis refers to preferential amplification of the higher modulating frequencies. Typically, the amplification is 6 dB per octave. Pre-emphasis is common in commercial-off-the-shelf equipment.

ITEM 17. Deviation Ratio. Enter the deviation ratio. For frequency or phase modulated transmitters, enter the deviation ratio. For FM systems, the deviation ratio is the ratio of the maximum amount of drift to either side emission deviates from the center radio frequency (frequency deviation), to the maximum frequency of the input modulating signal. This RF deviation is directly proportional to the amplitude of the modulating signal, since the amount of carrier RF “swing” is tied to the amplitude variance of the modulator. In phase modulated (PM) systems, the deviation ratio is tied to both the amplitude of the modulating signal and phase deviation constant of the modulator. The PM deviation ratio is not a function of the frequency of the input modulating signal. Example: For an FM system a deviation ratio of 1 indicates that a 3 kHz input frequency will cause a peak instantaneous radio frequency carrier deviation of 3 kHz. A deviation ratio of 3 would result in a 9 kHz deviation of the emission when modulated with a 3 kHz signal. The formula for the deviation ratio of FM systems is:

where: fc = carrier frequency

For frequency shift keying (FSK) digital FM systems, the deviation ratio is given as follows:

where:

f2 = mark frequency f1 = space frequency fb = bit rate ITEM 18. Pulse Characteristics. For pulse modulated transmitters:

Enter the pulse repetition rate in pulses per second (pps). While “pulse pairs” are commonly used in IFF system specifications, it is not correct to list the pulse-pairs repetition rate in this block. Rather, the number of individual pulses per second is the correct figure. If several different pulse rates are employed by the system, each rate should be listed, rather than just the maximum rate. If the different pulse widths are associated with different pulse rates, then the association should be indicated.

b. Enter the pulse width at the half voltage levels in microseconds (usec). The pulse width is that time period during which the voltage to the antenna exceeds 50% of the highest voltage that will be conducted to the antenna. This time period is measured in microseconds. The pulse width of a transmitter cannot exceed one divided by the pulse rate (1/pulse rate). To do so would yield a transmitter duty-cycle of greater than 100%. If several different pulse widths are employed by the system, each pulse width should be listed, rather than just the widest pulse. Note: For FM pulse radar, enter in the remarks area the bandwidth of the frequency deviation, which is the total frequency shift during the pulse duration.

c.

Enter the pulse rise time in microseconds (usec). This is the time duration for the leading edge of the voltage pulse to rise from 10% to 90% of its peak amplitude. There is an overlap between the rise time period and the pulse width period. The pulse rise time is the major contributing factor to the overall pulse width and the spectral power distribution. Different rise times will cause different RF emission Bandwidths. If pulse rise time is given as a range of values, the RF emission bandwidths should be calculated for the upper and lower limits of the range unless measured data is provided.

d.

Enter the pulse fall time in microseconds (usec). This is the time duration for the trailing edge of the voltage pulse to fall from 90% to 10% of its peak amplitude. The pulse fall time is the duration required for the trailing edge of the RF voltage envelope being supplied to the antenna to fall from 90% to 10% of its peak amplitude.

e.

Enter the maximum pulse compression ratio, if applicable. The pulse compression ratio, applies only to non-linear or linear frequency modulated (LFM) pulse modulation systems. An LFM pulse modulation system is one in which the carrier radio frequency is changed linearly during the pulse period. The compression ratio is the pulse width (in seconds) times the carrier radio frequency displacement (in Hz). Thus, a 50 microseconds pulse width with a linear FM (or chirp) of 1 MHz has a pulse compression ratio of 50. A phase coded pulse modulating system divides a pulse into N subpulses and then phase modulates the carrier accordingly. The code used to describe the phase of each subpulse is generally a “Barker Code” or m-sequence code. The compression ratio is N, the number of subpulses. The rise and fall time of the subpulse should be entered in item 24. “NA” should be entered in this block for all amplitude and non-pulsed modulated systems.

ITEM 19. Power. Enter the mean and/or peak envelope power delivered to the antenna transmission line. If there are unique situations such as interrupted CW, provide details in item 24. Indicate the units, e.g., W or kW.

Enter the mean power. Mean power is defined as the power supplied to the antenna transmission line averaged over a time sufficiently long compared with the period of the lowest frequency encountered in the modulation. For a pulsed system, the mean power can be computed with the following formula:

MeanPower=PeakPower x DutyCycle(PulseWidth x PulseRate)

Mean Power and Peak Power in Watts

Pulse Width in seconds

Pulse Rate in Pulses per second.

b.

Enter the Peak Envelope Power (PEP). PEP must be provided for all amplitude modulated systems and pulse modulated systems. The PEP is defined as the average power supplied to the antenna transmission line by a transmitter during one radio frequency cycle at the highest crest of the modulation envelope.

ITEM 20. Output Device. Enter a description of the device used in the transmitter output stage, e.g., ceramic diode, reflex klystron, transistor or traveling wave tube.

ITEM 21. Harmonic level. Enter the harmonic level in dB relative to the fundamental (dBc) of the 2nd and 3rd harmonics. Enter in item c the relative level in dBc of the highest powered harmonic above the 3rd. A harmonic is an out-of-band spurious energy occurring at multiples of the center radio frequency. Whenever possible, the harmonic power level should be determined from the actual radiated spectrum of the transmitter. If it is not possible to conduct radiated spectrum measurements, the spectrum present at the antenna terminals should be measured.

ITEM 22. Spurious Level. Enter the maximum value of spurious emissions in dB relative to the fundamental (dBc) which occurs outside the -60 dB point on the transmitter fundamental emission spectrum (Item 12) and does not occur on a harmonic of the fundamental frequency. Whenever possible, the spurious power level should be determined from the actual radiated spectrum of the transmitter. If it is not possible to conduct radiated spectrum measurements, the spectrum present at the antenna terminals should be measured. The least desired but still acceptable method of measurement is measuring the spurious power levels present in the final RF stage of the transmitter.

ITEM 23. FCC Type Acceptance No. Enter the FCC type acceptance number if applicable. The FCC type acceptance number does not exempt the equipment from the DoD frequency equipment allocation process. A radio frequency certification is still required for all equipment developed, leased, modified, or procured by any DoD agency or contractor in support of a DoD contract.

ITEM 24. Remarks. Enter any information that needs to be continued from an item listed above. When entering information, list the item number for which the information pertains. Realize that the readers of the application have a wide range of technical knowledge – make sure that the information provided is easy to understand. There is no limit to the number of continuation pages included. The security classification of any information contained in the “Remarks” block must be explicitly marked.

CLASSIFICATION: Enter the overall classification of this page.

3.3 RECEIVER EQUIPMENT CHARACTERISTICS PAGE INSTRUCTIONS

RECEIVER EQUIPMENT CHARACTERISTICS

9. FREQUENCY TOLERANCE

a. -3 dB

CALCULATED MEASURED

b. -20 dB

a. -3 dB

b. -20 dB

c. -60 dB

c. -60 dB

d. Preselection Type

12. IF FREQUENCY

b. 2nd

14. MINIMUM POST DETECTION FREQUENCY

c. 3rd

a. ABOVE TUNED FREQUENCY

17. SELECTIVITY

b. BELOW TUNED FREQUENCY

a. SENSITIVITY

c. EITHER ABOVE OR BELOW

THE FREQUENCY

b. CRITERIA

d. NOISE TEMP

1. REMARKS

CLASSIFICATION

DD Form 1494, May 91

RECEIVER PAGE INSTRUCTIONS

CLASSIFICATION: Enter the overall classification of this page.

PAGE: Enter the page number.

ITEM 1. Nomenclature, Manufacturer’s Model No. Enter the Joint Electronics Type Designation System (JETDS) designator, followed by “Receiver.” If there is no JETDS designator assigned enter the manufacturer’s model number, e.g., MIT 502 followed by “Receiver.” If neither of the above options is available, enter a short descriptive title, e.g., Airborne UHF Receiver. The JETDS designator should be used when available (See Appendix E).

ITEM 2. Manufacturer’s Name. Enter the manufacturer’s name.

ITEM 3. Receiver Installation. Choose from the following platform types where the receiver(s) will be installed: “Aircraft”, “Ground”, or “Ship.”

ITEM 4. Receiver Type. Enter the generic receiver type (“Superheterodyne”, “Homodyne,” “Tuned Radio Frequency (TRF),” or “Regenerative,” depending on the form of detection used), general modulation-type, and receiver purpose as a four- or five-word description. If the receiver is a superheterodyne enter the number the number of stages. If the receiver is not A homodyne receiver it mixes the incoming RF signal with a signal very close in radio frequency, thereby converting the RF to baseband without using an intermediate or IF stage. This form of detection is quite often used with Doppler radar. The incoming RF is mixed with a low level sample of the signal being output by the transmitter. The resulting baseband signal is the amount of Doppler-induced shift. A TRF or regenerative receiver uses the received signal in a positive feedback manner to generate oscillation within the detector itself. This technique is rarely used in modern communications and radar systems. Examples are: “Single Conversion FM Communications,” Homodyne Doppler Pulse Radar,”

ITEM 5. Tuning Range. Enter the frequency range that the receiver is capable of being tuned, e.g., 225-400 MHz. This should be the lowest-tunable center radio frequency through the highest-tunable center-radio frequency. For each frequency range that the system operates on. For equipment designed to operate only at a single frequency, enter the frequency of operation. Indicate units, e.g., kHz, MHz or GHz.

ITEM 6. Method of Tuning. Enter the method of tuning by indicating the method of effecting change and device insuring frequency stability, e.g., manually adjusted klystron cavity, fixed crystal, crystal synthesizer. If the equipment is not readily tunable in the field, indicate in item 21, “Remarks,” the complexity of tuning.

ITEM 7. RF Channeling Capability. Describe the RF channeling capability. For uniformly spaced channels, enter the center frequency of the first channel and channel spacing e.g., 406 MHz, 100 kHz increments; for continuous tuning, enter the lowest frequency and the word “continuous;” for others, such as HF Single Side Band or cases where channel selection is under software control, enter a detailed description in item 21. Any constraints on using any of these channels must be described in item 21, e.g., degraded channels, internal hardwiring limitations or lockout capability for frequency hopping systems. RF channeling does not include the net channels created by “Distributed Time Division Multiple Access (DTDMA),” but does include the actual RF band(s) occupied by those nets.

ITEM 8. Emission Designator(s). Enter the emission designator(s) for each mode of operation, as described in Appendix D. If the system uses frequency agility identify each mode as hopping or non-hopping (e.g. 64M0F3E (Hopping)).

ITEM 9. Frequency Tolerance. Enter the frequency tolerance, i.e., the maximum departure of a receiver from its assigned frequency after normal warm-up time has been allowed. Indicate the units in parts per million (ppm) for all emission types except single sideband which shall be indicated in Hertz (Hz).

The equation above can be used to convert frequency drift in Hz to frequency tolerance in ppm. The center frequency must be specified in the same units as the frequency drift.

ITEM 10. IF Selectivity. Enter the bandwidth for each IF stage at the -3, -20, and -60 dB levels. Indicate units, e.g., kHz or MHz. This applies to all superheterodyne receivers. The number of IF stages corresponds to the number of IF frequencies listed in item 12, and the number of stages of conversion indicated in item 4. A receiver described as a “triple conversion” receiver must have three sets of bandwidths listed in item 10 and three IF frequencies listed in item 12. Generally, IF bandwidths are smaller than the RF bandwidth, with each successive IF stage having a smaller or equal bandwidth than the previous one. Since the final IF filter must pass the modulated signal at the translated carrier frequency, its bandwidth should equal or exceed the necessary bandwidth listed in item 8. However, the final IF stage is also responsible for rejecting unwanted carriers in the immediate vicinity of the desired signal or “adjacent-channel selectivity.” Thus the final IF bandwidth should not be much larger than the necessary bandwidth(s). If the receiver is a homodyne or a TRF type receiver, the appropriate entry in this block is “NA.”

ITEM 11. RF Selectivity. Enter the bandwidth at the -3, -20 and -60 dB levels. The acceptance bandwidths of the RF circuits preceding the mixer or detector are required in this block. These bandwidths should reflect the attenuation of the received signal by the antenna, the antenna-transmission line, and RF pre-selection-filters, and any RF pre-amplifiers. The bandwidth curve of the mixer selectivity should be greater than or equal to the curve of the received signal. If this is not the case, information will be lost because of the inability of the receiver to accept the entire signal. To avoid the waste of spectrum, some form of pre-selection or filtering should be used to match, as closely as possible, the receiver selectivity curve of the transmitter signal’s bandwidth curve. The significant types of pre-selection employed must be entered in line (d). Some examples are: “waveguide cutoff,” “YIG filter,” and “6-pole Butterworth filter.” The primary purpose of the RF stage is to reject the “image” and other spurious signals before they get to the mixer.