REF ·rn:A65611 

EXTRA.CT PROI • Arm,y Ground Force • !QUIRmNT 'REVIEW BOARD - Part II 

PKOPCBEJ1 Mn.lTARY CIWlACTERISTICS POR PORTABLE LIGHTWEIGHT SPEECH 

SECURITY EQUIPMEN'l' /#J/6'5Q. .-'1 

1. Purpoae. Purpose ot this speech 119curit7 aquipnent is to provide aecurit7 

to voice commanicat1cn over wire and radio circuit• in regimental, battalion, 

and compa1'l7 nets. 

2. Operational Characteristics • 

. a. The equipment shall ertectival.7 conceal trom an ane1117 the sense or a 

message transmitted through the equipment. 

b. Concealment ot the aensa ot meaaage transmitted shall be effected 

through a changeable key or setting which is capable of being so varied that 

capture ot the equipnent will not lead to reduction or the aecurit7 or voice 

tranam1ss1ona. Design ot the equipment aball provide securit7 for a m1n1mmn 

period of ten hours subsequent to each ke7 change. 

c. Equipment shall be: 

( 1) Operable as terminal equipment and require no mod if'ication of the 

radio sets or telephone equipment with which it worka. 

(2) So designed that pre11m1nal"J' adjustment can be performed by 

trained wire or radio operators. 

(J} So designed that the setting o~ the key' and operation ot equipment after installation and preliminary adjustment will be 

possible b,r an untrained operator. 

(4) So designed, it pl"acticabla, that it can be connected bf plugs 

into the microphone and headset cords or a radio set or into the 

handset cord or a field telephone. 

~. The ~qu1Pf!l8nt &hall pl"OVide a clear unmistakeable, uncomfortable warning to the uaer if tranamisaion :Sn the clear la ocurring. 

a. Equipaent ahall operate aatiatactorily at ambient temperatures from 

·40oto ,J 12ooP. 

t. Power consumption ahall be aa low as is feasible. Power supply shall, 

1t practicable, 'be from the batterr ot the radio set with which the equipment 

is being used. Operation tram a 11eparate battery- llhall be possible. 

-- · Declassified and approved for release by NSA on 04~21-2014 pursuantto E.O. 1352a 
REE\?l~65 611 J~":., t..il 

2. I• Equipaent ahall be capable• with the addition ot a suitable vibrator 

t)"pe power auppl)" e.nd ahock proot mounting, ot being operated in a vehicle from 

atandard l2•volt and 24-wlt vehicle batteries. 

3. fhyaical Ch&racter1et1cs. 

a.· The equipment shall be or 811ch size and shape as to be readily carried 

on a standard quartermaster pack-board. 

b. Equipment will not we.fdt more than 15 pounds exclusive of prin1ar7 aource 

ot power. 

c. Equipment shall be waterproof' and capable of' operating under all condi• 

t1ona encountered 'b1' tactical radio equiplll!lnt. 

PROPOSED Mn.l'l'ARY CHARACTERISTICS Fat PROI'ABLI SPEECH SECURl'll 

EQUIPMENT A.?J/GSQ '"S 

1. Purnose. Pur:s>ose of this speech security eq,uipment is to provide 

security to TOice colll!ll1U11cation over wire and radio circuits in Army', Corps, 

and 'ivision nets. 

2. Operational Characteristics. 

a. The equipment shall effectiYely conceal from an enemy the sense of 

a message transmitted throught the equipment. 

b. Concealment ot the sense of meaaage transmitted shall be effected 

through a changeable kq or setting which is capable ot being so varied that 

capture or the equipnent will not lead to reduction of the securit7 of voice 

transmissions. :'ea1gn or the equipment shall provide securit7 for a minimum 

period or ?'2 hours subsequent to each k8)" change. 

c. :r.guiwnt ahall be 1 

(1) Operable as teminal equipment and re(luire no moditicatlon 

ot the radio 88ts or telephone equipment with which it works. 

(2) So designed that preliminary' adJustment can be performed "1' trained wire or radio operators. 

(J) So designed, 1t practicable, that it can be conmcted bf 

pluga into the microphone and headset cords ot a radio set 

or into the handset cord ot a f'ield telephone. 

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REF' ID-:¥5611 

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2. c. (4) So designed that the Mtting of the key and operation ot equipment after installation and pre11mirlar7 adjustment will be 

possible by an untrained operator. 

d. The equipment shall provide a clear 11D111istakaable, uncomfortable warning to tha user if transmission in the clear is occurring. 

e. Equipnant shall operate satisf'actor!l7 at ambient temperatU1"9s f'rca 

·400 r. to ~uo0 r. 

t. Power conslJlllption shall be as low aa is feasible. Power supply ahall, 

11' practicable, be f'rom the battery or the radio set with which the equipment 

1s being used. Operation trom a separate battery aball be possible. 

3. Phraical Characteristics. 

a. The equipment shall be of such size, shape, and weight aa to be readily 

transported and operated in a "J/4 ton weapon carrier. 

b. Equipment shall be waterproof and capable of operating under all con• 

d itions encountered by tactical radio equipment.