AN-PRC-64_report_AD464299_1965.pdf

《AN-PRC-64_report_AD464299_1965.pdf》由会员分享，可在线阅读，更多相关《AN-PRC-64_report_AD464299_1965.pdf（59页珍藏版）》请在收音机爱好者资料库上搜索。

1、UNCLASSIFIED AD. 46 4 299 DEFENSE DOCUMENTATION CENTER FOR SCIENTIFIC AND TECHNICAL INFORMATION CAMERON STATION ALEXANDRIA. VIRGINIA UNCLASSIFIED NOTICE: When government or other drawings, speci- fications or other data are used for any purpose other than in connection with a definitely related gove

2、rnment procurement operation, the U. S. Government thereby incurs no responsibility, nor any obligation whatsoever; and the fact that the Govern- ment may have fonmlated, furnished, or in any way supplied the said drawings, specifications, or other data is not to be regarded by implication or other-

3、 wise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to ,nuature, um. or sell any patented invention that my in an wy be related thereto. FOR OFFICIAL USE ONLY ILI -J ?MY P07RODUMM mODWC10N WILL BE MADE IF UL3)BY UnwIfZ (11 DC. DDC JUN

4、 10 1965 ARMY CONCEPT TEAM, IN APO SAN FRANCISCO 96245$ f -r , .FOR OFFICIAL USE ONLY, AN= COIT nRAM Nvmu1 AFO S ,Unoo 96.,A. AVfAL3 mia ArOT pEE MnY LG-.v REPRO u C p 0 PI .USE: ONLY I. PREFACE A. ABSTRACT The purpose of this, evaluatidn was to. assessthe.u.ability o.the AN/PRC-6 rao set for use in

5、 the. tghi: atmaoh. .ic isq level exiting in the Republic of Vietnm (RVN) a .for ,u 4 USSpecia .L.ForCes patrole in the counterpisurgency envi= .ent.of. theR.VN . Two geographically different areas were chosen for the. evaluitio. Phase I was conducted in the Mekong Delta and phase 11 in the.Central.

6、 Hig lands. The radios were used by US Special Fozces-.4, detacbmems. during patrol operations and at forward operational base-.(FB) stations in. liu of radio set AN/GRC-109. Data. were collected from personal observations, discussions with Special Forces advisors and signal officers, and oper- ator

7、s logs. The principal result of this evaluation was the 4determination. thatz the AN/PW-64 radio set provides reliable continuous wave .(CV): ionnicstion at distances between 60 and. 500 kilometers, It provides. reliable v.ice comunication only at distances betwen Q 4d :20 kilometers. and .thenm onl

8、y. - in the Mekong Delta. The whisper capaW4.it of the. radio. set is reliable and just as effective as a normal voico t s sion. User reaction to the AN/PRC-64 was excellent and the reo*end its adoption for counter- insurgency operations. Although the AN/PRc-64 does Mt pr*vide reliable voice. colnup

9、ication at all distances and locations, it 4$ concluded that its performance on CW and weight, size, and ease of operation maim it suitable for use by US Special Forces teams in the RVN a* a replacement for the AN/GRC-109. B. OBJECTIVES AND METHODS 1. Objective 1 -Continuous Wave (CW) Reliabilita De

10、termine whether radio set AN/PRC-64 provides reliable CW comuni- cations at selected distances and locations. Radio logs were maintained to meet this objective. 2. ObJective 2 -Voice Reliability Determine whether radio set AN/FRC-64 provides reliable voice com- munications at selected distances and

11、locations. The method used in meeting this objective was the same as for objective 1. v FOR OFF ICIA L JUSE O NLY FOR OFFICIAL USE, ONLY 3. Objective 3 -Whiser Caability Determine whether radio set AN/PRGC., provides reliable voice cor- munications at selected distances and locations when using the

12、whisper capability. The methods employed in meeting this objective were analysis of radio logs and professional opinions. 4,. Oblective 4 -.User Reaction Assess user reaction to the radio. The methods used to meet this objective were anaysis of mainte- nance logs and professional opinions. C. SUMMAR

13、Y OF CONCLUSIONS AND RKCMMEDATIONS It is concluded that the AN/PRC-64 is suitable for uxe by US Special Forces teams in the RVN and it is recomuended that it be .procured:an-in the high atmospheric noise level existing in the RVN and.ita.suita whereas, during the more favorable propagation period fr

14、om 0800 to 2000 hours, 65 percent of the attempted transmissions were successfully completed. The second factor that had an adverse effect on communication reliability was interference from higher powered stations. Frequency control and assignment in the RVN and neighboring countries is not rigidly

15、enforced. Frequency control and assignment among military users and government, agencies in the RVN is 8 FOR OFFICIAL USE. ONLY ,i. *:,.-o. * .- FOR OFFICIAL USE ONLY. 0 to r -t t c)-r 0 0.rR 0 0 0% HA t 1 00 00 0 -0 0H e 0 H It H 0 0 Hf 0f 43 4O 0 H 0o C-) 0 0? 1 0 - - T II - 0) -r4- N 0) 43 0 4z-

16、0 - -a 04 FORCS4 OFICA US OL FOR OFFICIAL USE ONL , c Ai U clii0 CN, oc04 0) 0 H c 0 - 0 0 TI -d 010 00 Q_1 0 C1 0 1 . 0 *9 0. 1CU - - -0 0 0H lcd cii c I - - J o 41 04- 4-) 0r- 0C 0 100 0- CU, 4 -toa 0 0O gH 0 Q.t-t0 0 0 r-: whereas, the reliability factor for this same period was 65 percent in the

17、 CW mode as shown in figire 4. In summary, it was found the AN/PRC-64 did not provide reliable voice communication. Although it was 100 percent reliable in the Mekong Delta because of the favorable terrain in that area for ground wave propagation, the overall performance of the AN/PRO-64 when operat

18、ed in the voice mode was unreliable. C. OBJECTIVE 3 -WHISPER CAPABILITY When a successful voice tranamission was achieved the operators switched to the whisper mode and continued the voice contact at a whisper. In each case reliable voice commnnication was maintained and no loss in signal strength o

19、r readabiLity was noted. In summary, it was found that the whisper capability of the AN/PRC-64 was reliable and was just as effective as normal voice transmission. D. OBJECTIVE 4 -USER REACTION Users found the physical chracteristics of the AN/PRC-64 to be excel- lent for couxterinsurgency u-se. It

20、is small, compact, and can be easily carried by one man It was operated under both wet and dry conditions and on several occasions inadvertently submerged during river crossings. At no time did the radio become inoperative because of weather or environ- mental conditions. The users found the AN/PRC

21、64 easy to operate. It took approximately 30 minutes to familiarize qualified radio operators with tuning and oper- ational procedures. During combat patrol operations the radio was placed 13 FOR OFFICIAL USE ONLY FOR OFFICIAL USE ONLY cd co (0 0 0r4 0 0. H 4 0 0 o 0 0 H0J0 ol t E- Hf 0f 0 r r t I-

22、Hd 0 0 1 40) H *rq 0 0 0 t 0 d 0 0.I I 0 ON 0) FOR OFFCIA US 0NL FOR OFFICIAL USE ONLY in operation by one man in approximately ten minutes. It was taken out of operation, packed in the fabric bag, and made ready for movement within 5 minutes. In comparison the AN/GRC-109, which consists of three pa

23、ckages (transmitter 9 ibs, receiver 10 lbs, and hand generator 22 lbs), takes two men to transport, approximately 20 minutes to place in operation and another 10 minutes to prepare it for movement. In addition, the long wire antenna used with the AN/GRC-109 is dumbersome and time consuming to instal

24、l and recover in Jungle and mountainous terrai The AN/PRC-64 required no maintenance. During the evaluation one microphone and one ear plug headset became defective and were replaced. No other spare parts were consumed. Battery life was excellent and ex- ceeded 14 days under normal operations. Users

25、 recomended that a more rugged CW key with less lateral movement be developed. In summary, it was found that the weight, compact packaging, zminte- nance, and waterproof characteristics of the AN/PRC-64 make it suited for counterinsurgency operations in the RVN. The simplicity of operation and ease

26、of familiarization of radio operators with the equipment (30 minutes), and the ease of transport and installation (10 minutes) by one man make it superior to the AN/GRC-109 for counterinsurgency operations. The po- tential users of the radio set in the RVN reconmended that it be procured and issued

27、on the basis of 3 sets for each US Special Forces *A detachment and 15 sets for the Special Forces Group signal company as a replacement for radio set AN/GRC-I09. 15 FOR OFFICIAL USE ONLY FOR OFFICIAL USE ONLY, JZ.CONCLUSIONS AND RECOMMENDATIONS A. CONCLUSIONS It is concluded thatg 1. The AN/PRC-64

28、radio set provides reliable CW comunication during favorable propagation periods at distances from 60 to 500 km. 2. The AN/PRC-64 radio set provides reliable voice communication at distances only from 0 to 20 km and then only in the flat, marshy terrain of the Mekong Delta. It does not provide relia

29、ble voice communication in the mountainous jungle terrain of the Central Highlands at any distance. 3. The whisper capability of the AN/PRC-64 is reliable and is just as effective as a normal voice transmission. 4. The weight, ease of installation and operation, compact packaging, maintenance, and w

30、aterproof characteristics of the AN/PRC-64 make it suited for counterinsurgency use in the RVN. 5. The AN/PRO-64 radio set is suitable for use in patrol operations by US Special Forces teams in the high noise level environment of the RVN. 6. The CW key is too fragile and has too much lateral movemen

31、t. B. RECOMMENDATIONS It is recommended thatt 1. The AN/PRC-64 be adopted for use by US Special Forces *A* de- tachments in the BVN as a replacement for the AN/GRC-I09. 2. The AN/PRC-64 be procured and issued to the 5th Special Forces Group (Abn) on the basis of 3 sets for each US Special Forces *A

32、de- tachment and 15 sets for the Special Forces group signal company. 3. The CW key should be redesigned to make it more durable and to eliminate lateral movement. 17 FOR OFFICIAL USE ONLY ANNEX A EQUIPMENT 1. CONCEPT OF EMPLOYMENT The AN/PRC-64 is a lightweight HF radio designed for use by long ran

33、ge infantry patrols engaged in jungle warfare or counterinsurgency operations. Its light weight, compactness, ruggedness, and ease of oper- ation make it suited for use by foot-mobile troops. Because of its low power output it should not be used as a net control or base station when a more powerful

34、radio set is available. It will give best results when communicating with a fixed base station which has a horizontal wire antenna arranged for high angle transmission into the reflecting layers of the ionosphere. It is also designed to provide reliable communication among patrol groups using the di

35、pole antenna, a component part of the set. The frequency of the AN/PRC-64 has been set to cover the 2.5 to 6.0 megacycle range in order to obtain maximum benefit from the iono- spheric layers which give the best reflective effects to vertical incidence signals. It will net with any HF-AM radio that

36、covers the 2.5 to 6.0 megacycle band. During the evaluation it was netted at various times with the AN/GRC-87, AN/GRC-109 and AN/GRC-26. (See annexes D and E for net diagrams.) Because of its role as a long range jungle patrol radio set, the AN/PRC-64 has some features not ordinarily found in tactic

37、al manpack radio sets. These special features include: a) Whisper Voice A switch on the control panel enables an operator to whisper into the microphone and obtain full modulation. b) Battery Condition Indicator When the battery test button on the control panel is depressed, a lamp will glow to indi

38、cate whether the internal battery is good. c) Burst Transmission The control panel has input keying terminals and a 12-volt output Jack for connecting a burst code keyer. The circuits have been designed to allow keying speeds of up to 300 words per minute. This feature was not evaluated because a bu

39、rst code keyer was not made available. A-1 ANNEX A 2. DESCRIPTION Radio set AN/PRC-64 is a transceiver contained in a metal case measuring 9 x 5 x 31 inches. (See figure A-i.) The minimum transmitter power output is 1.5 watts on voice and 5 watts on CW. A microphone and two earphones are supplied wi

40、th the set. (See figure A-2.) A telegraph key is mounted on the panel and a Jack is provided for connection of other keying means. An external wire antenna is used with the set. A receiver and transmitterg each covering the frequency range of 2.5 to 6.0 mc on four preset crystal controlled channels,

41、 are contained in the metal case. The receiver frequency will be identical with the transmitter frequency when both channel selectors are set on the same number. Preset frequencies may be obtained in the following ranges: Channel 1 -Range: 2.5 to 3.1 mc Channel 2 -Range: 3.1 to 3.9 mc Channel 3 -Ran

42、ge: 3.9 to 4.8 mc Channel 4 -Range: 4.8 to 6.0 mc The AN/PRC-64 relies on sky wave transmission to provide long distance communication. To achieve sky wave transmission, the dipole antenna is mounted horizontal to the ground and tuned to the operating frequency by changing its physical length. It co

43、nsists of two equal length wires laid out in a straight line with the radio set in the center. The total length of wire used is 168 feet. It is arranged so that the length is adjusted for the channel in use as follows: a) Channel 1 has all shorting straps connected and uses the full length of 168 fe

44、et. b) Channel 2 has the shorting straps open 17 feet from each end making the full length 134 feet. c) Channel 3 has the shorting straps open 31 feet from each end making the full length 106 feet. d) Channel 4 has the shorting straps open 41 feet from each end making the full length 86 feet. The we

45、ight of the set with mercury battery installed is approxi- mately 8 pounds. A spare battery weighs 2J pounds. The set, spare battery, and antenna kit are designed to be carried in a fabric case suitable for attachment to combat pack harness. (See figure A-3.) ANNEX A A-2 FIGURE A-1. AN/PRc-64 radio

46、set. ANTIENNA EARPU MICROPHONE ANTENNA HEADSET FIGURE, A-2. AN/PRC-64 radio set with case open. A,3 ANNEX A Ws FIG=R A-3. AN/PRC-64 radio set attached to combat Pack. ANNEX A A-4 ANNEX B SETTING OF THE EVALUATION The Republic of Vietnam (RVN)occupies a crescent-shaped area of about 67,000 square mil

47、es on the southeastern edge of the Indochina Pen- insula. Although only 45 miles wide at the 17th parallel, its demili- tarized northern border with the Democratic Republic of Vietnam (North Vietnam), it has a seacoast of 1,500 miles on the South China Sea and Gulf of Siam, and western borders with

48、Laos and Cambodia of about 900 miles. The land borders are poorly defined and drawn through difficult and inaccessible terrain. 1. TERRAIN There are four distinct geographical regions: The highlands located in the north and central portion, the plateaus of the central highlands, the coastal plain, a

49、nd the Mekong Delta in the south. See figure B-1. The northern two-thirds of the RVN is dominated by a chain of broken mountains and rugged hills extending in a northwest-southeast direction and terminating on the northern edge of the delta plain about 50 miles north of Saigon. the capital. The area is characterized by steep slopes, sharp crests, narrow valleys, and dense vegetation. It is sparsely populated, mainly by primitive and nomadic tribes, and it contains few roads or trails. The central highlands a