ML19308C191

Field Incident Radio Sys. Draft Specs

ML19308C191
Person / Time
Site:	Crane
Issue date:	07/20/1978
From:	MITRE CORP.
To:
Shared Package
ML19308C183	List: ML19308C182 ML19308C186 ML19308C189 ML19308C191 ML19308C194 ML19308C198 ML19308C202 ML19308C205 ML19308C208 ML19308C210 ML19308C213 ML19308C215
References
TASK-TF, TASK-TMR NUDOCS 8001210526
Download: ML19308C191 (35)

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20.luly 197.i t

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{!?! D INCIT:::,'T "APIG S'lTEM Y

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Thin specific.atica sets forth requirements for a Field Incidenc i

Radi o Syr. tem (FIRS). The F'RS is intended for use by field

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invest.iration and inspection teams of the Naclear Regulatory i

Commission (.sRC) to provide clear voice radio communication 1

among team members and leaders, and between team leaders and

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NRC cffices via a radio / telephone company inter-connection.

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j addition to a system description this section of the specification contains a concept of operations to help vendors to understand the manner in which the systera as a whole will be used.

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1.1 System Description

Following a serious incident involving one of its licensees l

l the NRC must obtain' various measurements and other highly technical information about the effects of the incident, 9

j information which may be best obtained by dispatching a i

special team from one of five regional offices throughout the country.

Once at the site of the incident the team must communicate continually with its home office and occasionally i

with NRC !!cadquarters. The FIRS is intended to extend the f

communications link from a telephone interconnect (as near

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as possible to the incident site) to all team members for as i

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long as necessary.

In the most demanding situations a more i

. capable system will be ficwn in within 8 to 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> to i

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v relieve the FIRS.

If, on the other hand, che situation improves until only occasional communication with the field team is necessary, the FIRS could be used for several days while the team nonttors the residual effects of the incident.

1.1.1 Ifsers The system will be used by NRC specialists who have not been trained as communicators. All pctential users will receive some familiari:ation during regular drills.

1.1.2

!!a_ior Components A field team nay require the following major system components:

Up to six handheld transceivers (! HIT)

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Dnc transceiver at a field operations center (FOT)

One transceiver at the telephone line interconnect (P LT)

One repeater (RPT) between a PCT and *FOT not in the line of sight of each other, or berknen Hilts.

1.1.3 Ancillary Components Ancillary components such as antennas; interconnecting cables and couplers; power supplies and chargers; speakers, microphones and headsets; and carrying packages shall also be part of the system.

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iV 1.2 Concept of Onorations Field teams may respond to incid:ents at fixed sites (such as a nuclear fuel manufacturing plant) as well as to rail, truck, 1

h or aircraft accident sitos.

They may operate at distances i

I of up to 15 miles frca a telephene line interconnection in l

nearly any kind of terrain, but most operations will not i

cxtend that far. Before they leave their office the field team members will nearly always know the si:e of the arca and kind of terrain over which they must operate. The field team must also. carry instruments and other equipment, so it is very important that the FIPS equipment be designed i

i and packaged in such a manner that the field team can

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quickly select only the necessary componer.ts and carry no 9

unneeded weight to the site.

(See Section 1.3)

Typically, the field team of two to six members will take a private car or cab from the regional office to an airport, i

charter a plane to an airport as close to the site of the 1

0 incident as possibic, and rent a car to reach the site. The j

team must carry all equipment.

At the site, the telephone interconnection will be made (through arrangements with the local telephone company, if necessary) and FIRS components a

will be deployed with the team members. Sections 1.2.1 through 1.2.3 describo the three deployment situations envisioned for FIRS.

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1.2.1 Situation 1: Fleid Operstions Center located at t

telephone line interconnection (Figure 1).

In this situation the fic1d Team I,cador (TL) *<ill communicate via handheld transceiver (!!!!T) with team members and by telephone directly into the local l

telephone conpany system. Team members will be no more than 5 miles from the TL, who will voice-relay information between the team and all others outside the Field Operations Center.

The telephone interconnect may be an existing telephone or may be a temporary drop installed by the local telephone company upon emergency request from the NRC. The TL will be able to place or receive calls. When faced with Situation 1 the field team should be able to select and carry only one package containing three !!!!Ts. Six liHTs l

may be carried in two packages or as a singic combined package made up.of the three-unit todules. If the terrnin and distance nake it necessary, the team may also carry a separate repeater unit which will roccive on a frequency (F1 = 163.6625 Milt) which the !!!!Ts can transmit but not receive. Note that only persons at the field operations center can communicate directly into the telephone system.

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F1 = 165.6625 bilz i

F2 = 169.1000 b,11z l

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FIELD INCIDENT RADIO SYSTEM

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SITUATION 1 I

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>s 1.2.2 Situation 2:

Field Operations Center located within 5 miles and in line of sight of the telephone line I

i interconnect (Figure 2).

As in Situntion 1, the team members will be within 5 4

l miles of each other and the field operations center, where the TL will be located.

And, again, a repeater i

j may be needed for communications between lillTs. A transceiver (PLT) must be left with a voice-operated i

l switch and an accustic coupler at the telephone line interconnect point when the,tcam deploys to the area of the field operr.tions center.

(PLT,like the repeater, may be unattended between battery changes.)

The TL HHT, like the other Hilts, can receive only F2 and must use F1 to transmit to PLT.

The repeater, if it is within i

line of sight, will repeat the F1 transmissions to all J

UllTs on F2.

Coded squelch on some other means of reducing this confusion is necessary.

For example, if PLT employs squelch code A to recogni:e appropriate transmissions, then all lillTs shall employ a different squelch code B.

The TL llHT and one other litiT (for a spare) must be able to select either code A or code B depending on whether the TL wishes to communicate i

through the telephone system or with team members.

. Communications discipline and some care in positioning the repeater can be employed to reduce further the o

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j po t.ibility of unint"nticaal transmissiona into the l

l telephe:ic.<ystem, but procedures r.ust be suited to j

the users.

As i:t Situation 1, i t i:t preferred thet 1

the r? be no di rect communications from the tea n i

i cembern into the telephone system.

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1.2.3 Situation 3:

Field Operations Center located more i

j than 5 miles from, or out cf line of sight of, the telephone company interconnection (Figure 3).

I Another transceiver (FOT) must be deployed at the field operations center to communicate with PLT, and a j

repeater will be necessary also if F0T and PLT are not l

in,line of sight of each other.

If a repeater is not f

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used then FOT and PLT transmit and receive on mirror 1

frequencies; if a repeater is necessary they both transmit on one frequency and roccive on the other.

Two squelch codes (or other means of discrimination)

I and discipline will allow the repeater to be used between IDITs as well if the geography permits.

In some terrain conditions '(for examplo, if the repeater i

cannot be placed on the exact crest of a ridge), a

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special antenna may be necessary to enhance the system j

perfomance.

(See Section 3.7) i.

1.3 Proposal Options and Limitations 1

j Proposals may address any of the following:

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FIGURE 3 FIELD INCIDENT RADIO SYSTEM j

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l g f_ig n 1 - Co:.g.b t e FI P.S, less upti on,1 ontennas and pac'.cging.

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Six gnmy, of equipment will be procurnt, each g om consisting of i

4 i!!!Ts wi th cr.c sque".ch coJo or equivalent j

2 !!f!Ts with tuo aquelch codes or equivalent l

One FOT

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We PLT i

j One repeater i

All necessary ancillary equipment Option 2 - Optional rntennes (Section 3.7).

Six such antennas i

may be procured.

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f.m e Option 3 - Optionet fills, including speci:11 antennas and packaging.

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1.3.1 Technical Limitatie t t

l The following general limitations apply in addition to l

the specific equipment requirements listed elsewhere in this specification':

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Only frequencies F1 (165.662S MI:) and F2 (169.1000 M!i:)

1 will be used. They will be considered to be clear channels for the purposes of this specification.

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Equipment shall employ all solid-state electronics.

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System components (summari:cd in Sections 1.1.2 and t

1.1.3) should be availabic for delivery within three i

months of contract award and should be readil'y repairabic at several locations in the United States.

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i As an alternative to qt'ick repair the r.upplier m.ny furnish locn equipment at no cost to the Government I

while components are being repaired.

Proposals should include proposed provisiere. for maintenance and repair.

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Components may be packaged in modular carrying cases or in any other form which will allcw the fic1d team to select quickly the equipment needed to =cet any of the three situations described in Section 1.2.

l However packaged, the team should be abic to carry I

all necessary equipment in no more than fn tr units

, eighing no more than 35 pounds each.

w 1.3.2 Basis for Evaluation l

Proposals will be evaluated using the following criteria which are intended to encourage innovative system designs and flexibility in meeting the needs of each operational j

situation:

a.

Proposed specifications meet all stated technical requirements and limitations.

b.

System design minimizes the total packaged weight and operational complexity for each operational situation described in Section 1.2.

(Functional components described in Section 1.2 may be combined or configured in any way to minimize total weight or reduce system compicxity, provided that the resultant 9

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hybrid co"ponent meets all pe rformance requirements stated in this specification fer the separate 9

components.)

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Minimum cost.

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Ease of maintainability and repair.

Less important criteria which will also be applied are:

The degree of cocconality among major systen e.

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components and such ancillary equipment as batteries 4

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and chargers.

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Operational flexibility or capabilities which exceed i

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requirements.

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2.

APPLTCALT.I' DOCI' :ENTS 2.1 Elect *onte Induntries Association (EIA) Dacuments 4

2.1.1 RS-152-B Land "nhile Commu ication, Dt or PM Transmitters, 2 5-4 70M!I:.

2.1.2 RS-204-A Minimum Standards for Land-Mobile Conmunication Di or PM Receivers 25-470MHz.

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2.1.3 125-220 Continuous Tone-Controlled Squelch Systems (CTCSS).

i 2.1.4 RS-316-A Minimum Standards for Portable / Personal Land Mobile i

Communications.

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2.1.5 RS-329-A Minimum Standards for Land-Mobile Communication j

j Antennas Part I - Base or Fixed Station Antennas.

2.1.6 RS-329-1 Minimum Standards for Land-Mobile Communication i

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Antennas Part II - Vehicular Antennas.

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2.1.7 RS-388 Minimum Standard for Test Conditions Common to FM or PM Land-Mobile Communications Equipment, 25-470MHz.

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This section defines the requirements for the Field Incident Radio l

l System which consists nominally of the four major functional subsystems listed below together with their ancillary equipment.

!!andheld Tranceivers (!!!!T)

Field Operations Center tranceiver (FOT) f Repeater (RPT)

Phone Line Transceiver (PLT) 1 i

j 3.1 General l

The subsystems shall operate in narrow band frequency modulation (FM) using a maximum deviation of + 5 K!!: on the frequencies of j.

165.6625 (F1) and 169.1000 MI: (F2). Section 1.2 describes the operational situations in which the FIRS will be employed.

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3.2 Flexibility i.

l The emphasis in this specification is on the total system.

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Although major subsystems are discussed as different items in l

Section 1.2, another system design.may provide'for fewer discrete i

. subsystems combined in some way to yield the necessary operational capabilities with less total weight and complexity. Such designs I

are encouraged as long as any hybrid subsystem meets all

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performance requirements of the. item or items which it replaces I

i functionally.

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3.3 Handhald Transcuiver nequirenents j

j This scetion specifics the requirement for the llandheld Tran:ccivern.

I 3.3.1 ceneral The Handheld Transceiver (HHT) shall be a compact, lightucight single l

unit two-way FM radio transmitter / receiver, employing self-contained batteries, built-in microphone and speaker, and attached antenna. The i

HHT shall be capable of operation in either simplex (single frequency transmit / receive) or half duplex (transmit and receive on different frequencies) by personnel with minimum technical ' communications skills.

3.3.2 Electrical Performance

3. 3. 2.1 Frequency. General Characteristics l

The llHT shall cuerate in two channel modes: Normal and Repeater.

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Changing modes shall be accomplished by a single switch action, with no retuning of RF and/or antenna components.

3.3.2.1.1 Normal Mode

.In the I!ormal Mode (commercially referred to as " Talk-around"),

both transmit and receive frequencies shall be 169.1000 MHz (F2).

I 3.3.2.1.2 Repeater Mode In the Repeater Mode (wherein two-way communication between HHTs I

is via a repeater) the transmit frequency shall be 165.6625 M112 (F1) and the receive frequency shall be 169.1000 MHz (F2).

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3.3.2.1.3 rreguency Senhtlity

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The stability of both the trancy.itter and rocciver shall be 40.001%

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over a temperature rcnge of -30*C to +60*C.

l 3.3.2.1.4 nF Impedance I

The transmitter RF load impedance and the receiver RF input Unpadancos shall ba 50 ohms.

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i 3.3.2.2 Transmitter Characteristics j

3.3.2.2.1 RF Power Outnut

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The transmitted RF power output shall not be less than 5.0 watts at 1

169.1000 MH, and not less than 3.75 watts at 165.6625 MHz.

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3.3.2.2.2 Spurious and Harmonic. Emission i

I Spurious and harmonic emissions shall be at least 50 dB below the i

l transmitted power output at both 169.1000 and 165.6625 MHz.

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3.3.2.2.3 Modulation l

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The transmitter shall employ Frequency Modulation (FM) with a deviation 0 to +5 KHz (16F3).

3.3.2.2.4 FM Noise FM noise shall be at least 50 d3 below rated power.

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3.3.2.2-5 Audio Renponse l

The audio response shall be within +1 to -3 dB of 6d3/ octave pre-4 l

enphasis,300 to 3000 Hz.

1 3.3.2.2.6 Audio Distortion The audio distortion shall be not greater than 87. at 1000 Hz.

1 3.3.2.3 Receiver Characteristics I

1 3.3.2.3.1 Sensitivity The receiver's sensitivity shall not be less than 0.35 on(EIA 12 dB

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SINAD), 0.5 uv for 20 dB quieting, and 0.25 v for noise squelch.

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3.3.2.3.2 Selectivity l

The receiver selectivity (based on 30 kHz..annel spacing) shall be not less than -70 dB (EIA SINAD).

j 3.3.2.3.3 Intermodulation Intermodulation products shall be smaller than -60 dB.

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3.3.2.3.4 Spurious Response and Image Rejection 1

Spurious response and image rejection each shall be smaller than

-60 dB.

l 3.3.2.3.5 Audio Response i

j Audio response shall be within +2 dB to -10 dB of 6 dB/ octave i

de-emphasis,300 to 3000 Hz.

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1 3.3.2.3.6 Audio Outrut Audio output shall be not less than 500 m!' at not more thna S*.

distortion.

3.3.2.3.7

.tn tenna The !!nndheld Transceiver shall enploy a built-in nntenna tuned to cover the 165.6625 and 169.1000 MI: band.

The antenna may be of the flexibic stub type or other suitable device that occupies a minimum space. Means for connecting an external antenna via additional coax shall be provided.

3.3.2.3.8 Coded Sauelch Each transceiver shall be equipped with a tone-coded squelch circuit or other suitable means of minimi:ing reception of messages not intended for the handheld unit.

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Two of every six units shall have a second selectable tone-code or the equivalent.

3.3.2.3.9 Remote Operations ne !!andheld Transceiver shall incorporate provision for remote operation (i.e., hands off operation) whereby the push-to-talk, microphone, and speaker functions are separated from the unit.

l These provisions shall be accomplished by plugging in the desired function; a microphone / headset provision may be combined in one plug.

3.3.3 Physical Specifications 3.3.3.1 Size and Weight 1he !!andheld transceiver shall be a single unit device with outside dimensions of not mere than 7" high, 2-7/8" wide, and 1-5/8" deep 16

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k (including battery but not including antenna). Weight, including built in antenna and batteries shall not exceed 28 oz.

The battery ccction shall be connected to the loacr parc of the unit to provide i

a lowered center of gravity.

3.3.3.2 controls All operating controls shall be located on the top of the unit, with the exception of the push-to-talk switch which shall be en the upper left side. All controls shall be operable with a gloved hand, and shall employ detent-type stops for frequency change and on-off switches.

3.3.3.3 ' Enclosure The unit shall'be constructed of a high impact material and shall meet or exceed the vibration and shock tests in EI A Specification

1. RS 316A. The enclosure shall be moisture resistant and be capable of operation in rainfall of 4-12 mm/hr.

The unit shall be equipped with a belt clip with swivel mount, a shoulder strap, or the i

j functional equivalent.

i 3.3.4 Battery

.i The battery shall be readily and quickly replaceabic as a unit without i

j the use of twist wires, screws, soldering, or application of hand tools.

3.3.4.1 Battery Life, I

Battery life, measured at 25*C, with a duty cycle of 5-5-90%

(5% transmit, 5" receive, 90% standby) shall be a minimum of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> 17 s,

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uhen usin;', rechargeable batterica such as MiCad or other similar I

types having a 1:.ah watt-hour to weight ratio.

Battery life shall j

be a minious of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> when using dispocabic batteries of the mercury, alkaline, or similar types.

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3.3.4.2 Recharging i

Chargers shall fully recharge a discharged battery in four hours or less when operating from 120V AC.

Connection of the battery to the charger shall be simple and positive, without the use of twist wires, I

screus, soldering, or application of hand tools.

Circuits shall be l

provided to protect against excessive charging currents and/or i

over-chatging.

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3.3.4.3 Battery /Charcer Options l

The battery type, charger rate, and number of spare batteries may be varied in any way to provide for continual operation of the HHT on a i

5-5-90 duty cycle while reducing system weight or incrensing i

commonality.

A low-battery indicator and provisions for charging l'

from a 12 VDC automotive battery are desirable options.

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i 3.4 Fleid Operations Center Transceiver his sect!on specifies the requirencnts for the Field Operations C.mter (FOT).

3.4.1 Gene ral

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The FOT shall be a fixed portable VIIF FM voice communications l

transceiver. no station shall consist of transceiver, antenna and

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transmission line, microphone, speaker, and power source.

The F0T shall be capabic of operation by personnel with minimum technical communications skills.

Each unit shall be capable of operating from a battery pack, a 12 VDC automotive. system, or 120 VAC as the

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operator may choose.

j 3.4.2 Electrical Performance

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i 3.4.2.1 Frequency i

The FOT transmitter shall operate on the frequency of 165.6625 MII:

and the receiver on 109.1000 M11z.

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L 3.4.2.1.1 Frcquency Stability 1

i The stability of both the transmitter and the rocciver shall be 1,

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+0.001% over a temperature range of -30*C to +60*C.

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l 3.4.2.2 RF Impedance 1

4 The transmitter load impedance and the receiver RF input impedance shall be 50 ohms.

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3.4.2.3 Transmitter Characteristics 1

i 3.4.2.3.1 RF Powr Output l

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Tlie transmitter RF power output shall not be less than 20 watts I

j at t frequency of 165.6625 M!!z.

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3.4.2.3.2 Spurious and Harmonic Emisnion Spurious and harmonic emission shall be at least 55 dB below the l

transmitted output at 165.6625 M'dz.

i 3.4.2.3.3 Modulation I

l The transmitter shall employ frequency modulation with a deviation of 0 to i 5 KHz (16F3).

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3.4.2.3.4 FM Noise I

I FM noise shall be at least 55 dB below rav> eco:put.

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t 3.4.2.3.5 Audio Response The audi6 response shall be within +1 and -3 dB of 6 dB/ octave i

t pre-emphasis, 300 to 3000 Hz.

3.4.2.3.6 Audio Distortion L

l The audio distortion shall be less than 87. at 1000 Hz.

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I 3.4.2.4

_Pece i vo r _ Cha rac te ri r ti c_a 3.4.2.4.1 Sensitivity

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1he receivet's sensitivity shall be not less than 0.35 v (CIA 12 r

dB SINAD ), 0.5 v (20 du Quieting), and 0.25 v for noisu squelch.

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i 3.4.2.4.2 Selectivity The rocciver selectivity (based on 30 Kilz channel spacing) shall I

be not less than -70 dB (EIA SINAD).

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l 3.4.2.4.3 Intermodulation Intermodulation products shall be - 75 du or less.

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3.4.2.4.4 Spurious Response and Image Rejection Spurious response and image rejection cach shall be - 80 dB or i

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i 3.4.2.4.5 Audio Response i

l Audio response shall be within + 2 and -10 dB of 6 dB/ octave de-I emphasis characteristic from 300 to 3000 Hz.

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3.4.2.4.6 Audio Output Audio output shall be not less than SW (into speaker load at 1000 H:)

at not more than 10% distortion.

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i 3.4.2.1.7 Coded Sauelch 4

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lhe reccher shall be equipped t.ith a tone coded-squelch circuic, using 2 selectabic tone codes, or equivalent means of rainimizing F

reception of messages not intended for the FOT.

3.4.2.5 Antenna i

j The FOT shall have means for connecting nn external antenna (see 1

i Secti on 3. 7). The external antenna shall be lightweight quarter-j wave ground plane radiator, tuned to approximately 167. 4 11:, and exhibiting an impedance of 50 ohms. The traasmission line shall be 20' of P.G-8/U (or equivalent), terminating in UIIF connectors.

Antenna gain shall be a minimum of 3 dB over isotrcpic.

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l 3.4.2.6 Microphone L

l The FOT shall employ a transistorized microphone having 0.09VRMS 1

l output at 600 ohms. The microphone shall also inco porate a push-to-talk switch.

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i 3.4.2.7 Speaker 4

j The FOT shall incorporate a speaker (preferably internal) capable of handling SW audio power continuously. The impedance of the t

speaker shall match that of the receiver.

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l 3.4.3 F5yri t cal 1

I 3.4.3.1 Size and Weight j

The FOT shall be a single unit devi,ce uith a total volume (not including microphona and antenna) not to exceed 0.25 cubic feet, and a weight l

(including batteries) not to exceed 20 pounds.

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i 3.4.3.2 Controls 4

All operating controls shall be functionally grouped and placed so as to I

be operated by gloved hand.

All controls for frequency change and on-off f

functions shall employ detent stops.

The push-to-talk function shall be i

incorporated with the FOT microphone.

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3.4.3.3 Enclosure l

The FOT shall employ such design and construction practices to meet or exceed the vibration and shock tests in EIA Specification RS-316A.

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enclosure shall be moisture resistant and be capable of operation in i

rainfall of 4-Emm/ hour.

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3.4.4 Battery i

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The battery shall be placed in such a location as to insure positive l

mechanical stability of the FOT when in operating position.

The battery shall be readily and quickly replaceable without the use of twist wires, screws, soldering, or the application of hand tools..

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i 3.4.4.1 Enttrar? Life Battery life, measured at 25 C, with a duty cycle of 3-5-90% (52 transmit, 0

5% receive, 90% standby) shall be a minimum of 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> when using rechargeable batteries.

Battery life shall be a minimum of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> l

when using disposable batteries.

3.4.4.2 Recharging i

Battery chargers, operating from 120V AC, shall recharge the FOT battery l

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in not more than 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br />.

Chargers shall incorporate circuitry to protect batteries against excessive charging currents and overcharging.

1 3.4.4.~3 Battery / Charging Options J

The battery type, _ charger rate, and number of spare batteries may be varied in any way to provide for continuni operation of the FOT on a 5-5-90 duty cycle while reducing system weight or increasing commonality. A low-battery indicator and provisions for charging l

from a 12 VDC automative battery are desirabic options.

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3.4.4.4 Operation from Automobiles Two cables shall be provided for operation from a 12 VDC automotive one terminating in a standard automobile-type cigar-lighter system:

plug, the other terminating in battery-type spring connectors, suitably marked for polarity. Both cables shal1~ be 10' in length, and sited for the FOT electrical load.

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3.5 trepeat er Nani ra tents l

Eis section specifies the requirenents tor the repeater.

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3.5.1 Ge:tersi i

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The Repeater (RPT) shall be a fixed portable VIIF FM voice i

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communications receiver / transmitter. %c RPT rocciver output j

shall be directly connected to tha transmitter modulator input f

in such a manner to pomit simultaneous re-trensmission of the received message. no RPT shall consist of receiver / transmitter, antenna (including support and transmission line), and power source.

The RPT shall be capable of being setup for operation by personnel l

with minimum technical communications skills, and shall operate unattended for the life of its batteries. The duplexer (Section 3.5.6) 1 may also be part of the repeater, or it may be separate.

3.5.2 Electrical Perfomance j

3.5.2.1 Frequency The RPT receiver shall be fixed-tuned to 165.6625 MI: and the transmitter shall operate at 169.1000 Mil:.

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3. S. 2.1.1 Prequrn,cv Stabillt'-

I The stability of both t.he transmitter and receiver shall be 10.0013 over a I

j temperature range of -300C to +600C.

3.5.2.2 RF In.pedanc_e The transmitter load impedance and the receiver RF input impedance shall i

j bc 50 ohms..

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1 3.5.2.3 Transmitter Characteristics

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l 3.5.2.3.1 RF Power Output i

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The transmitter RF power output shall be not less than 20 watts at 169.1000MI!z.

3.5.2.3.2 Harr.onic Output Total harmonic output shall be at least 40 dB below rated power output.

j 3.5.2.3.3 Spuriou$ Output I

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All spurious outputs shall be at least 50 dB below rated power outpet.

4 3.5.2.3.4 Modulation d

The transmitter shall employ frequency modulation with a deviation of j

0 to i 5 KIls (16F3).

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3.5.2.3.5 FM Noise FM noise shall be at least 50 dB below rated output.

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3.5.2.3.6 Audio' Response -

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The audio response shall be within+ 1 and -3 dB of 6 dB/ octave i

j pre-emphasis, 300 to 3000 Hz.

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3.5.2.3.7 Audio D.. Portion xJ The audio diutartion chall be less than 37. at 1000 I!:.

3.S.2.3.8 Au::iliary Microphone Input The transmitter chall have a jack to accommodate a standard dynamic microphone (section 3.4.2.6) and PTT switch to provide a local voice input for testing cnd/or maintenance.

3.5.2.4 Receiver Characteristics 3.5.2.4.1 Sensitivity The receiver's sensitivity shall be not less than 0.3 v for 20 dB quieting, and 0.25 v for noise squelch threshold.

3.5.2.4.2 Selectivity The receiver seicetivity (based on 30 KHz channel spacing) shall be not less than -70,dB.

3.5.2.4.3 Modulation Acceptance The receiver modulation acceptance bandwidth shall be +7.5 KIIz.

3.5.2.4.4 Audio Resoonse The audio response curve (de-emphasis) shall be compatible with the transmitter curve (section 3.5.2.3.6).

3.5.2.4.5 Auxiliary Audio Output The receiver shall have either a speaker or jack to permit connection of earphones for local testiag and maintenance.

3.5.2.4.6 Automatic Time Out The receiver shall employ an automatic circuit to disable the transmitter in the case where an incoming signal does not cease within l

a specified time period (i.e., stuck PTT switch on transmitter entering RPT).

i The circuit shall be ' field adjustable (screwdriver or knob) over the range g

of 0.5 to ? minutes, with approximate time markings on the control.

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1 3.5.3 Physic:0 Sc.fe Micatiog.a, i

3.5.3.1 Str.c and Weight t

The Repeater may optionally be either a single unit device (self-4 i

I contained battery) or consist of separate electrcnics and battery mcdules.

i The single unit device shall not weigh more than 35 pounds and occupy not more than 2.0 ft3 The electronics module of the tuo unit device shall not weigh more than 20 pounds and occupy not more than 1.0 ft3; the battery module shall not weigh more than 15 pounds and occupy not nore l

than 1.0 ft3 4

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3.5.3.2 Controls All operating controls shall be clearly marked and operable with gloved.

j hand. Front panel controls shall include:

GN-OFF, Repeat Volume, 4

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Squelch and Receiver Volume. Optional controls: Repeat / Simplex suitch and Local Volume.

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l 3.5.3.3 Enclosure The RPT shall be enclosed in a transit case that is convertible into an operational shelter.

The enclosure shall be moisture resistant and be cepable of protecting the internal equipment in rainfall of 4-12 mm/hr.

i-3.5.4 Battery 4

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The battery (or. battery module) shall be readily and quickly replaceable without the use of twist wires, screws, soldering, or the application of hand tools.

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3. 5. /. 1 Satt.ry Life Batt;ery life, measured at 2 SOC, with a duty cycle of 10-902 (10 %

almultaneous reception and re-transe.ission, 90% standby) chall be a minimum of 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, using either rechargeanic or disposable batteries.

3.5.4.2 Recharging Battery chargers, operating from 12CV AC, shall recharge the RPT battery in not more than 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.

Chargers shall incorporate circuitry to protect batteries against excessive charging currents and overcharge.

i 3.5.4.3 Battery /Chargina Ontions The battery type, charger rate, and number of spare batteries may be I

varied in any way to provide for contin tal cperation of the RPT on a g

10-90 duty cycle while reducing system weight or increasing commonality.

An audible low-battery indicator and provisions for charging from a 12 VDC automotive battery are desirable options.

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3.5.5 Optional External Antenna 1hc Repeater shall have provisions to employ the antenna described in Sections 3.4.2.5 and 3.7.

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3.5.6 Antenna Duplexer To permit the RPT to simultaneously receive and transmit, a device shall

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be provided to protect the receiver from being blocked by the transmitter.

Such a device (duplexer),usually connected between the-common antenna and

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the receiver and transmitter antenna jacks, provides a sharp attenuation of the transmitter frequency while passing the received frequency

-relatively undiminished.

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3.5.6.1 Dupl.em e Incertion LO.c; 7

The insert ion los:! attributable to the duplexer shall ';e not more than 1.5 dB, eithcr in the receiver or transmitter catenna path.

l 3.5.6.2 Attenuation The duplexer chall provide the receiver uith a minimum of.65 dB i

attenuation of the transmitter power outp'ut.

3.5.6.3 VSUR and Impedance j

The duplexer shall enhibit a voltage standing wave ratio of not more than 1.5:1 at the frequencies of, 165.6625 to 169.1000 Mlle.

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Duplexer impedance shall be 50 ohms.

3.5.6.4 Duplexer Size and Ucight l

The duplexer shall occupy not more than 2.0 ft3 and weigh not more than 25 pounds.

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1 3.6 Phono 1.ine Tw.isceiver ge ruirem ate Thi s section apm.I fica the tcTri remen ts for the l' hone Line l

Transceiver.

1 3.6.I ft ncral Ec PLT requironents are the uma as the requirements for the FOT except as noted below.

Identical PLT and FOT units may be preposed if

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the requirements for both are satisfied.

i 3.6.1.1 Deletion from FOT Reauirements

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f he PLT need not enploy the FOT microphone or speaker.

3.6.1.2 Addi tiens to FOT r!cquirements 1

I Re T'.T must employ an automatic voice-operated transmit / receive l

switching circuit -(VOX) and shall employ an acoustic coupler to l

couple both audio input and output to and from a standard telephono

i instrument. The VOX need not be contained in the. PLT. The PLT i

shall operate in one of two modes selectabic by a switch on the PLT.

l When mode I is selected, the PLT shall transmit on F2 and receive on F1.

When mode 2 is selected, the PLT shall transmit on F1 and i

f receive on F2.

i 3.6.1.3 VOX Circuit nc VOX circuit shall enable the PLT to switch from transmit to receive and vice versa unattended when coupled to a telephone (Section 3.6.1.3. 2 below).

The PLT shall normally be in the receive 31

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node (111:en big yn F2 when a repeate r i ; used cr c:i F1 for a signal from the TOT when it is not used) with audio output coupled I

to the telephone transmitter.

Upon receptien of a voice signal from the telephone receiver coupled to the "LT the PLT receiver shall be dis-thled and the l'LT transmitter enabled on F1 (with repeater) or i

F2 (without). The node (via repeater or direct to the field i

operations center) shall be casily switchabic.

V0X settings, if necessary, shall be field adjustable (screwdriver or knob) without the use of external meters or test equipment.

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Since the PLT is to be identical with the FOT, the VOX circuitry may optionally be an additional small module external to the PLT.

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In such case, any interconnections shall be simple, requiring no i

hand tools.

1 3.6.1.3.2 Acoustic Coupler, General An acoustic coupler shall be provided to enable direct coupling of the PLT receiver output and the PLT transmitter input to a I

standard telephone instrument. The coupler shall be constructed to physically hold the device to the telephone instrument at the i

proper distance, and to maintain such distance under conditions of 1

instrument movement within the confines of the telephone instrument cord. The coupler shall connect to the PLT via a flexible coiled cord, ten feet in length, and terninating in plugs compatible with the PLT.

32

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3.6.1.3.2.1

.' cor: itic Couple.r Speder i

The aconcric coupler sp u ker component shall interface with the telephene instrut.'e..t mouthpiece (nicrophone) an<1 shall generate a sound level cuf ficient t.o drive the telephonc microphone. The r

speaker impedance shall be catched to the audio output impedance of the PLT.

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3.6.1.3.2.2 Acoustic Coupler ?fierophone The acoustic coupler microphone conponent shall interface with the telephone instrument carpiece and shall generate a level sufficient 1

to drive the PLT transmitter.

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l C 3.7 Ortional r,xternri Antenna

-l Le FOT, PLT, and !"'T shall have, in additi.ca to a self-contained i

antenna, provision for the connection of an external antenna via 4

coaxial cable transmission line. Ccnnection =cy be in place of the 1

built-in antenna, or at an auxillary connector.

If via the aux 111ary connector, means shall be provided to disabic the built-in antenna when the external antenna is in use.

3.7.1 Antenna. Electrical Characteristics then operating on the frequencies of 163.6625 and 169.1000 Mil, the antenna shall present a voltage standing wave ratio of 1.3 to 1 or l

1 css when connected to the transmitter. The antenna shall have a gain of not less than 3 dB over isotropic at the alove frequencies, and shall be omnidirectional in radiation pattern with vertical polari zati on.

3.7.2 Transmission Line and Connectors The antenna shall connect to FOT, PLT, or RPT via a coaxial cabic (RG-8/U or equivalent) 30 feet long, terminating in Pr.-259 UIIF plugs.

I

%c antenna proper shall have a S0-239 UHF jack as its RF connector.

He FOT, PLT, and RPT shall have a S0-239 UHF jack for connection.

3.7.3 Antenna Assembly The antenna shall be capable of being assembled by one person in 10 i

i minutes or less using simple hand tools such as screwdrivers and wrenches.

3.7.4 Antenna Support ne antenna shall be supported by a light weight mast or tower 20 feet O

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l h i;C. b: ;t:t:cture shall be enpable of being.isscabled and cre te:1 an the field by two p'rsonr. in 15 minutos or less, using only sir.ple hand tools such as scresdnvers and wrenches.

The structure may be guyed if necessary, and shall not require excavation and/or cenerete emplacenent.

3.7.5 Neight and Size ne antenna and its supporting structure shall ucigh not more than 35 potads, and shall be packaged for transportation is a reusabic container. He container shall be not more than 60 inches i

i in length, or 8 inches in width cr breadth and shall have a polume of 1.5 f t or less.

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