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N ILEC'i.S TD-O'204.00, "

NOVEMBE,R 1977

LAW ENFORCEPJlENT STANDARDS PROGRAM

FIXED AND BASE STATION ANTENNAS

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u.s. DEPARTMENT OF JUSTICE law £nforcement Assistance Administration

National Institute of law Enforcement and Criminiil Justice

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If you have issues viewing or accessing this file contact us at NCJRS.gov.

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'LAW ENFORCEMENT STANDARDS PROGRAM

NILECJ STANDARD FOR

FIXED AND ' BASE STATION ANTENNAS.

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A Voluntary National S,tandard Promulg~lte!l.~IY the National Institute of Law Enforcement and Crimi~arJustice.,

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NOVEMBER.1977

u.s. DEPARTMENT OF JUSTICE Law Enforcement Assistance Administration

National Institute of Law Enforcement and Criminal Justice

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NATIONAL 8NSTilUTE OF lAW ENFOR,CEMENT AND CRIMINAL JUSTICE

Blair G. Ewing, Acting Direct!or :r­.1;

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LAW ENFORCEMENT ASSIST~~CE ADMINISTRATION

James M.H. Gregg, Acting Administrator

ACKNOWLEDGMENTS

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This standard was formulated by the Law Enforcement Standards Laboratory of the National Bureau of Standards under the direction of Marshall '1 Treado. PrQgram Manager for CommunicatiolJs 'Systems. and Jacob J. Diamo~d. Chief of LESL. NBS Electromagnetics Division staff members responsible for the preparation of the standard were Harold E. Taggart. proj¢ct manager. Robert E. Nelson. and John L. Workman. Acknowledgment is given to previous work in this field by the Associated Public-Safety Communications Officers, Inc.; the Institute of Electrical and Electronics Engineers, Inc.; and the Electronics Industries Association,

For sale by the Superintendent of Documents. -J.S. Government Printing Office Washington. D.C. ,,'0,102

Stock Number 027-O()():..()()S67-S

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NII.ECJ STANDARD FOR

fiXED AND BASE STATION ANTENNAS

CONTENTS -....

Page Foreword .. c •••••••••••••••••••••••••••• '-:'-. • • • • • • • • • • ••• • • • • • • • • • • • • • • • • • • •• v I. Purpose and Scope ............................. '. . . . . . . . . . . . . . . . . . . . . . . . .. 1 2. Classification .............................................................. 1 3. Definitions .. ' .................................................... ; . . . . . .. 1 4. Requirements ... ,........................ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 2

4.1· Performance Requirements. . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . .. 2 4.2 User Information ............. : .......... " .............. : ....•......... 2 4.3 Rated Power Operation ........ , .............. : .......... , .... , .......... 3 4.4 Relative Antenna Gain .............. '.. . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 4.5 Radiation Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 3 4.6 Standing Wave Ratio ....... " ............................. ,«' • • • • • • • • • •• 3 4.7 Wind Velocity Rating .......... " ..... '" ............................. 3 4.8 Materials ................................................... :'. . . . . . .. 3

5. Test Methods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 4 5.1 Standard Test Conditions .............. , ............... , ............... 4 5.2 Test Equipment ...................................•................... 5 5.3 Scale Model Measurements ............................................ 5 5.4 Rated Power Operation Test ........................... , ............... 5 5.5 Relative Antenna Gain Test. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 6 5.6 Radiation Pattern Tests ..................... ~ .......................... 6 5.7 Standing Wave Ratio Test ..................... , ....................... 6

Appendix A-Bibliography ......... : ....... : ..................... ; . . . .. . . . . .. 9

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FOREWORD "

Following a Congressional mandate' to develop neW and improved techniques, , systems, and equipment to strengthen law enforcement and' criminal justice, the National Institute of Law E~forcement and Criminal Justice (NILEC.J) has established.the Law Enforcement Standards Laboratory (LESL) at the National Bllreau of Standards. LESL's fllnction is to conduct research that will assist law enforcl!ment and crirninal justice agen~ies in the selection and procurement of quality equipment:

In response to priorities established by NILECJ, LESL is (I) subjecting existing equipment to laboratory testing and evaluation and (2) conducting research leading to the development of several series of documents, including national voluntary, equipment standards, user guidelines, state-of-the art surveys and other reports.

This document, NILECJ-STD-0204.00, Fixed and Base Station Antennas, is a law enforcement equipment standard developed by LESL and approved and issued by NILECJ. Additional standards. as well as other documents are being issued 'under the LESL program in the areas of protective equipment, communications equipment, security systems, weapons, emergency equipment, investigative aids, vehicles and clothing.

This equipment standard is a technical document consisting of performance and other requirements together with a description of test methods. Equipment which can meet these requirements is of superior quality and is suited to the needs of law enforcement agencies. Purchasing agents can use the test methods described' in this standard to determine firsthand whether a particular equipment item meets the requirements of the standard, or they may have the tests conducted on their behalf by a qualified testing laboratory. Law enforcement personnel may alsotreferencethis standard in pur<;hase documents and require that any equipment offered for purchase meet its requirements and that th,s compliance be either guaranteed by the vendor or attested to by an independent testing laboratory.

The necessarily technical nature of this NILECJ standard, and its special focus as a procurement aid, make it of limited use to those who seek general guidance concerning fixed and base station antennas. The NILECJ Guideline Series 'fills that need. We plan to issue guidelines to this as well as other law enforcement equipment as soon as possible, within the constraints of available funding and the overaIlNILECJ program.

The guideline documents being issued are highly readable and tutorial in nature in contrast to the standt1rds, which are highly technical and intended for laboratory use by technical personnel. The guideHnes provide, in nOll-technical language, .information for purchasing agents and other interested persons concerning the capabilities of equipment currently available. They may then sel~ct equipment appropriate to the performance required by their agency. Recommendations for the development· of particular guidelines should be sent to us.

NILECJ standards are subjected to continuing review. Technical comments and recommended revisions are invited from all interested parties. Suggestions should be addressed to the Program Manager for Standards. NatiorialInstitute of Law Enforcement and Criminal Justice, Law Enforcement Assistance Administration. U.S. Department of Justice. Washington,D.C~2053r.· , ,._.

Lester D. Shubin "Program Manager for Standards National Institute of Law

Enforcement and Criminal Justice

, " ·Section 402(b) of the Omnibus Crime Control and Safe Streets Act of 1968. as amended.

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NILECJ STANDARD for

NILECJ-STD-0204.00

FIXED AND BASE STATION ANTEN~JAS . • ~ ----""-:'-& ~

1_ PURPOSE AND SCqPE

The purpose of this document is to establish minimum performance requirements and methods of test for antennas that are used at base stations or other fixed sites by law enforcement agencies~

2. CLASSIFICATION

For the purposes of this standard, fixed and base station antennas are classified ~Y their operating frequency and their directional pattern. 2.1 Operating Frequency 2.1.1 Type I

Antennas for use in the 400-512 MHz band. 2.1.2 Type II'

Antennas for use in the 150-174 MHz band. 2.1.3 Type III

Antennas for use in the 25-50 MHz band. 2.2 Directional Pattern 2.2.1 Omnidirectional Ante~l"Ia 2.2.2 Directional Antenna

3. DEFINITIONS

The principal terms used in this docume'rit are defined in this section. Additional definitions relating to. iaw enforcement communication are given in LESP-RPT-0203.00 [7]. 3.1 Antenna Power Reding .~ !., The maximum continuous-wave power ..that can be applied to an antenna without degrading its performance. 3.2 Dipole Antenna, Resonal1t .t~I!:-Wavelength--'~··, _. ,"" ....

A straight radiator (usually energized at the center) whose diameter is.smallcompared to its length and whose electrical length is equal to approximately one-halfthe wavelength of the energizing signal. The radiator supports a line current distribution such that a Current node (zero net current) exists at each of the ends, producing maximum radiation in the plane at the center of the antenna and normal to its longitudinal· axis. 3.3 Directional Pattern·{Raciiatior. Pattern) .

The transmitting or receiving properties of an antenna as a function of direction. Direc~orial patterns are frequently given in vertical and horizontal plal1es. 3.4 Effective Antenna Volume

The vo.lume occupied by an antenna plus one-half wavelength in all directions wben it is rotated thr\ough 3600 as required by a particular test.

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3.5 Isotropic Radiator J A hyp6th~tical antenna radiating or receiving equally in all directions.

3.6 Pattern Recorder A device that· records the amplitude of the output signal from ~m antenna and receiver

combination as a function of the antenna orientation. '

3.7 Polarization .. The orientation of the electric~field vector of the wave radiated by an antenna. "

Alternatively, the orientation of the electric~field' vector of an incident wave which results in maximum avaiiable'J,ower at the antenna terminals. 3.S·Relative Antenna Gain

The ratio of the radiation intensity of an antenna in a given direction to the radiation intensity of a reference antenna in the same direction;. with the SJ,l.me power input to both antennas. If the reference antenna is a loss-less half-wave" dipole' antenna, the gain is expressed in decibels relative to the dipole antenna,. dBd. 3.9 Scale Ratio

The ratio of the operating frequency of a scale model. antenna to the operating frequency of the full size antenna.

3.10 Standing Wave Ratio (SWR) The ratio of the maximum to the minimum voltage or current appearing alon~. a

"'i! transmission line. , . I • ~ , ~t:.

3.11 Wind Velocity Rating The maximum wind velocity that an antenna assembly can withstand without physical

damage. . \':.- '

4. REQUIREMENTS

4.1 Performance Requirements The antenna shall meet or exceed all the requirements of this standard as given below

and summarized in table I.

4.2 User Information The information supplied to t)1e purchaser by the antenna manufacturer or di~tributor

shall include the following: a. Operating frequency range b. Antenna power rating c. Relative antenna gain vs. operating frequency d. Polarization e. Vertical radiation pattern f. Horizontal radiation p,attern g. Nominal impedance

Table I. Minimum Performance Requirements for Fixed and Base Station Antennas

Antenna Characteristic

Rated Power Operation

Relative Antenrla Gain

Radiation Pattern

Standing Wave Ratio

Wind Velocity Rating

Minimum Requirement

No physical damage

± 1.0 dB of max relative gain

± 1.0 dB or 10% of max relative gain, whichever is greater

1.5 or less

See table 2

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h. SWR vs. operating frequency i. Connector tyPe j. Wind. vel~city rating k. Physical dimensions I. Weight m. Antenna material composition n. Operating. installation and service instructions. o.Certification of compliance with this standard.

4.3 Rated Power Operafion , The antenna shall meet the requirements of paragraphs 4.4. 4.5. and 4.6 immediately

after being subjected to the test described in paragraph 5.4. In addition, tne antenna shall not be physically damaged by the" test. 4.4 Relative Antenna,Gain .

Thle relativ~ antenna gain. 'measured in accordance with paragraph 5.5, shall be within 1.0 decib~1 of the maximum relative gain specified by tl~e manufacturer in accordance with paragraph 4.2.c.. i'

4.5 Rac.uation'¢~ttern 4.5.1 Vefllical PaHem

The vertical radiation pattern, measured in accordance with paragraph 5.6.1, shall be , within 1.0 deCibel (or 10 percent of the maximum relative gain in deCibels, whichever is

greater) of the radiation pattern speCified by the. manufacturer in accordance With paragraph 4.2.e. 4.5.2 Horizontal Pattem . '

The horizontal radiation pattern shall be measured in accordance with paragraph 5.6.2. For omnidirectional antennas, the horizontal.radiation. pattern variation shall be within 1.0 deCibel throughout a 3600 vaiiation in azirnuthalangle. For directional antenqas, the horizontal radiation pattern shall be within 1.0 decibel (or 10 percent of the maximum, relative gain in decibels. whichever is greater) of the pattern specified by the manufacturer

',', in accordance with paragraph 4.2.f. '

4.6 Standing Wave Ratio TheSWR of the antenna. measured in accordance with paragraph;)5.7. shall be 1.5 or

less referenced to a 50-ohm system. 4.7 Wind Velocity Rating ?j

The antenna shall be capable of withstajlding wind velocities of 114 kil()meters per hour (71 miles per hour). without ice loadings. If mounted mOre than 90 meters (295 feet) above the ground or if located in zones Bor C (see figure 1). the antenna shall be capable. of withstanding the appropriate wind velocity. as listed in table 2. . ,y .'

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4.8 MOiterials .... ,'/; The materials used in ,·the antenna and in auxiliary items such as support"rle~bers.

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feed harnesses. connectors and mounting hardware sha!lprovide a high strength-to~Weight\~:;);;,.::~:.::::.._; .. ~~.<~.,.:.,~~,. ,I'

ratio and good resistance to corrosion;' "<,1,,~ "~~

Table 2. Wind Velocity Rating [2]

Antenna Base Height Above Ground

~ss than 90 m (295 ft)

90-200 m (295-656 ft)

More than 200 m (656 ft)

Wind Loading Zone

A B C

Wind Velocity.kmlhr (milhr)

114 (71) 132 (82)·· 145 (9Q)

123 (76.5) . 144 (89.5) 161 (100)

145 (90) 168 (104) 193 (120)

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5. TeST METHODS,: . . . ." . !i· , ' ,.'

5.1 Standard Test Conditions' !) ,

Unless otherwise specified,' perform all measurements 'at the Jltandard test· freque~cies under standard test conditions. Allow all measurement equipmerJt to warm up until {ile system has achieved sufficient stability to perform accurate measurements. 5.1,1 Standard Test Freq!Jendes "

'The standard test frequencies shall be three, frequencies, one''oeach at the low end,' middle and high end of the. operating frequency range (4.2:a). 5.1.2 Standard Radiation Test Site .

The standard radiation test site shall be located 011 level ground which has uniform electrical characteristics (Le., gmund constants). Reflecting objects (especially large metal objects), trees, buildings, and other objects which would perturb the electromagnetic fields

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to be measured should be no closer than 90 meters (295 ft) to any-measuring instrumentoL ___ ~~,~~~,L .. , the equipment under test. All utility lines and any cOrttr'01_9jr.C!!its-within- thetest: site,.

should be buried underground to a depth of 0.3 ,weter (approximately 1.0 ft). The. ambient electrical noise level shall be carefully -moititored to insure that it does, not interfere with the test being performed. The ambient noise level should be 14.dB or more below the·. signal levels being measured.

'. 5.1.3 Standard Test Range , Either a slant range, a ground level range or an elevated range may be used to me~asure relative antenna gain and/or vertical and horizontal radiation patterns. In each, the distance between 'the two antennas, R, shall be ten wavelengths or 2 d2/X (wheredis the , '-largest dimension, in meters, of th~antenna under test, and A is the free space wavelengtii:

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where R is the scale ratio, Ls iwany significanllin~ar dimension of the scal~niodel; and L is the <:orresponding liI'Jear, fjfmension of ,the, full-size antenna. The scale ratio shall" not exceed 6. The partsor-thc,'scale mocel'sha!lbe'constructed of the;~ameniateria!sasthe' corresponding parts,df/the fulJ~sjze antenna. If'the supporting t()y.fer or mast ,is an

"electrically essenti,~r part, of, the ante,nna or ;affects the electrical performance' of ,the antenna, it also"snaJI be constructed to scale.

5.4 Rat~d"Po~"er ()peration Test ',' f;' I(;e;iuthorizedby' the Federal Communications Commission to 'do so, mounf the

al}t:;:r;na on an outsk'ie range at a temperature of atJeast 20°(: (68°F)~and apply rated ,power (paragraph 4.2.b) for four hours at on~! of the standard test frequencies. If not

,:~ , .. authorizeli~to transmit i:t rated power into free space, place the antenna in a chamber that ;j/;:fP wm>rovide 60 decib,els or more of shielding and perform the same test? qJ _"" _ '

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5.5' Relative? Antenna GainT~st '·,tf~,,<_. . '.' .... " . ' Mount the sourceyaiHenna. .and· the, ante~na under lest in accorda~ce With 'paragrapll

5 .. 1;3,. so t~at their maximum transmi!tin!yreceiving lob~s' ~ positiOned f~r!torizontall)1 polanzed st~n~JJ,~ndcon~e~t.the e~U1pl,Pen! a~ sho.wn}n'~ure ~. Tuneth~ slgn~ s?ur~e \ to one oftfiestanaard test fr~.quencles, and. adjust Itso,~put until "b c~n\fenIent readmg IS obtained on the pattern recorder. Position and l;iligvlbothantennas for the max,.imum!f ,,' indic~tion on the pattern rec~rgerand ~ecord' thi.s;;/ading, P A, in decibels. Do nqt' adjust , !he ~!gnaf souree for the r.emamder/~f thiS te.st..I$~m!?ve the antenna und. er t. est and r.~Place, ,-" 'I It with the reference antenna. Position andabgn the reference antenna for the maximum received signal and record the reading, 'P~>I~ decibels. The relative antenna gain in tn~!'~>~~-"t~ direction of maximum radiation is PA-P~/'j~decibels relative to _a~lp~I¢.dnd"cRepeat~~r<7·· ", ~ach of the other two standard t~st frequencIes. !: ".,>/'~"'C' " .'. , ". l ' '. 5.6 Raaidtion Pattern Tests.;»')';""'" . /' 5.6.1 Vertical Pattern Test " .. ",. _./.1 .' :" . y,' .. /., .

,.' Use the same measurem~f1Lsetupas described in paragraph 5;5 aQP figure.,t,AHgn " and position ,both thes~!,lrce'llnd test antennas for maximum signal strength .. ~~(ijllst the' signal source focfui('scale indication. on the pattern recorder § )()., not adjust/'CitM~r' the pattern r~c;.Qfd~r~orJllt; sigflal sourcefoi' the remaind~r. of thi~ test.Obtain;Ahe vertic~( radiation 'patteff(~onhe anienna' under 'test by rotating .it through· 3600

' in the'plane' defined" .>bYits·nl~Qr axis and thd't. of the ~Qurce"ant~i1na. T,he starting' ana .... ·endfng points on the

pattern,record should.bi:Jhes~me. Ifti1~y "are not, repeat the .. measure'ment:·'Rep,eatfor' each of the other(wd st~ndard test frequencies. ,....;c.''''' 0:<, .Yj

5.6.2 P!'.r."t":;;! ~!:-:t!~~as as show. in figure 3. with their m<\iotaXes parllllel to' <'Oh "?~4 other 'in a 'vertical pl~ne and perpendictil~r to the imagInary lihethat 'iconnecis .tIJefr>,.>:iii:. midpoints. Adjust'the signal squrce and the'Rattern recorder contr:ols so that the~.patte'm,eF .• recorder indicates fun scale. Do riot' make~;:~ adjust.inents. fQr ,·the" rernain~er ~(. tb:'is .. ~test. -. '" .. -.-.O-~-:-~ Rotate the ante.rtna under test through 3600 about its rilajofaxis tQ: obtain ttie hqrizorlial " radiation pattetih of the antenna' under test. The startjng"and endingpointspn the:pac(ern record should; be the same. If they are not, repeat the measurement .,Repea( fo[;ea9h' of the other tW-Qstandard ,t,est frequencies. .' ..' . . " 1\ ." .;/ . ;s:i"Standing W~ve Rat.io Test ' "~~!;, .

. ' Although SWR is defined in terms of voltage or current, the meaimremenf proc::edure desc;,ribed herein uses a power measurement technique to'determinethe SWR, . ,<,

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ANTENNA: UNDER TEST

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Mount tIll! antenna under. test on ,a tower in the same m~riherin which, it, is ~6rma!lY' ,d

used with it~ base at least 3 meters (10 feet) above grOund, This is important for mou~tin,gs where the an.tennasupporting structurC! is in the field bfthe antenna. Connect ,the~" measuring instruments as sholNn in figure 4. Place ;the power meter very near the ante)~a';"<·\ inpUt terminals. If the ,line Joss ]n the rf 'transmission line connecti~g the' ppwern'lete,: to'­the antenna input terminals exceeds O.5ctB, correct jh~.meclsUi"ed SWR :.to"eliminate ,the ' t:ff'ect of the line loss, ; '::,. ~c •. ,.,,=,"<·~r"';"· ""."",', •

Use the power meter to, measuretfte,incident power delivered to the antenna and the reflected power from tHe antenna. Calculate the .SW.Rftom the following relationship,

' ~tiere"Pf',is the incident power in watf5~nd\~Prtherefiected power in watts. -:.' - > -'. . ";, .

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\ ~\ APPENDIX A. BmLIOGRAPHY "

\\.\\ I. Brown, J;S:; and McKee, K. E.,""Wind Loads' and Antenna Systems," Bulletin (~5, \ (September .1%4).' '. ..'

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:.:\ EIA StandardRS-222~B. "StruCtural Standards for Steel Antenna Towers and Antet)na ';\Supporting Structures," (December 1972). . 'j:

3. EIt\. Standard RS-329-A/ "Minimum Standards for Land-Mobile Communicati(\ns Antennas, Part I----Base or Fixe,d Station Antennas," (December 1975). '\

4.Green~"F. M., "NBS Field~Strength Standards and Measurements (30 'Hz to 1\)0 MHz)," Proceedings IEEE, 55, No: 6, 970-981, (JuneJ967). i\

5. Hollister, S. C., "The Engineering Interpretation of Weather BUfe/,iu Records for Wind Loading Structures,".NBS),Building Science Series 30,Win~ Lmids"oo Buildings and Structures, R. D. Marshall and H. C. S. Thorn, editors, (t970);' ,,",~'

6. IEEE Test Procedures for Antennas, Numb,erJ49-;(January 1965):;', 7. LESP-RPT-0203.00, "TechnicaLTt;:nTIs''aiuf Definitions Used with Law Enforcement

Communications Equipment, (Radio Antennas, Transmitters and Receivers)". Stock No. 270Q-002i4;if:s. Government Printing Office, Washington, D.C., (June 1973) .

. 8. RoarK, R. J., "Formulas fOf'Stress and Strain," 4th e~ition, (McGraw-Hili, 1965). 9. "Specifications for Aluminum Structures," Aluminum Construction Manual, section 1 ,

(Aluminum Association, November 1972). , 10. Tag,gart, H. E., "Field-Strength Calibration Techniques at the National Bureau of

Standards," IEEE Trans. Electromagnetic Compatibility; EMC-7, No.2, (June .1965). II. Taggart; H. E., and Workman.J.L..., "Calibrationi>Jinciples and Protedure~ for Fleld

.. Strength Meters (30 Hz to I GHz),"·NBS Technical Note 370, (March 1969). 12. Thorn, H. C. S., "Distribution?f ,Extreme Winds in:Jhe United States," J. Structural

Div., ASCE, 86, No. ST4. Proc~'PaPer 2433, (April 19(0). ,.' ,

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PUBLICATIONS OF THE LAW ENFORCEMENT ' .. STANDARDS PROGRAM

The following publications of the Law Enforcement Standards Program issued by the National Institute of Law Enforcement and Criminal Justice are for sale by the U.S. Government PrintingOft1ce. For information concerning the availability and price of any of thepublkations write to: Superintendent of Documents, U.S. GovernmentPrinting Office, Washington, D.C. 20402.

NATIONAL INSTITUTE OF LAW ENFORCEMENT AND CRIMINAL JUSTICE STANDARDS (NILECJ-STD)

NILECJ~TD TITLE ,GPO STOCK NO.

0301.00

0302.00

0303.00

0103.00 0205.00 0601.00

0202.00 0104.00 0201.00

0602.00

0203.00 0307.00 0304.00

0211.00

0207.00 0603.00 0305.00 0105.00 0212.00

0206.00

0208.00 0106.00 0308.00

Hearing Protectors for Use on Firing Ranges, March 1973

Magnetic Switches for Burglar Alarm Systems, March 1974

Mechanically Actuated Switches for Burglar A1a.rm Systems, May 1974

Mercury Switches for Burglar Alarm Systems,May 1974 "

Portable Ballistic Shields, May 1974 Mobile Antennas, May 1974 Walk-Through Metal Detectors for Use in Weapons

Detection, June 1974 Mobile FM Transmitters, October 1974 Riot Helmets, October 1974" Fixed and Base Station FM Transmitters, September

1974 Hand-Held Metal Detector for, Use in Weapons

, Detection, October, 1974 PersonaVPortable FM Transmitters, October 1974 Metallic Handcuffs, October 1974 Passive, First Generation Night Vision· Devis;es,

June 1975 Batteries for PersonaVPortable Transceivers, June

1975 Mobile FM Receivers, June 1975 X-Ray Systems for Bomb Disarmament, June 1975 Active Night Vision Devices, June 1975 Crash Helmets, June 1975 RF Coaxial Cable Assemblies for Mobile transceiv­

ers, September 1975 Fixed and Base Station FM Receivers, September

1975 Personal/Portable FM Receivers, October 1975 Ballistic Helmets, September 1975 Sound Sensing Units for Intrusion Alarm Systems,

March 1977

10

027-000-00 182-3

027--OOO-OO23~2

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027--OOO-OO~54-4 027·~253-6 027--OOO-OO25~1

027--000-00256-1 027--000-00287-1 027-000-00286-2

. 027-OOO-OO35~3

027-000-00285-4 027-000-00293-5 027-000-00292-7

027-000--00325-7

027-OOO-OO34z...:1 027-000-00344-3 027--000-00343-5 027-000-00346-0 027-000-00347.;..8

027-000-00357-5

027-000-00358-3 027--000-00)66--4 027-OOO-OO37~2

027-000-00452-1

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NATIONAL· .INSTITUTE OF LAW ENFORCEMENf • AND CRIMINAL JUSTICE GUIDES (NILECJ-'G!.JID~) :)

NlLECJ-GUIDE TITLE GPO STOCK NO. 0301.00

0101.00

Selection and· Application Guide to Fixed Surveil­lance Cameras··

Selection Guide to Hearing Protectors for Use on Firing Ranges, April 1976

;

027-000-00281-1

027-000-00427-0

* u.s. GOVERNMENT PR'·NTING OFFICE. 1977 0-244--6t.4

12.

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