AN-PRC25_serv_TM11-5820-398-35_1965.pdf

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1、TM 11-5820-398-35 DEPARTMENT OF THE ARMY TECHNICAL MANUAL F I E L D A N D D E P O T M A I N T E N A N C E M A N U A L RADIO SET AN/PRC-25 T h i s c o p y i s a r e p r i n t w h i c h i n c l u d e s c u r r e n t p a g e s f r o m C h a n g e s 1 a n d 2 . H E A D Q U A R T E R S , D E P A R T M E

2、N T O F T H E A R M Y 8 JANUARY 1963 WARNING DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT When Receiver-Transmitter, Radio RT-505/PRC-25 is in a transmit condition, 45 volts dc and 125 volts dc are generated in module Al and applied to trans- mitter power amplifier V1. The 45-volt potential is also ap

3、plied to modules A6 and A7. Take all necessary precautions. DONT TAKE CHANCES! CAUTION This equipment is transistorized. Before connecting test equipment within the modules, insulate test prods and clips with insulating tape or sleeving. Leave an absolute minimum of exposed metal, and be extremely c

4、areful to avoid short circuits; they may cause exten- sive damage. Do not make resistance measurements unless specifically directed to do so. 2 Figure 5.1. TM 5820-396-35-CI-9 5 Figure 7.1. TM5820-398-35-CI-4 7 TM5820-398-35-CI-2 Figure 22.1. CHANGE No. 2 Changes in force C 1 and C 2 TM 11-5820-398-

5、35 C 2 HEADQUARTERS DEPARTMENT OF THE ARMY WASHINGTON , D. C., 22 April 1965 Field and Depot Maintenance Manual RADIO SET TM 11-5820-398-35, 8 January 1963, is changed as follows: Note. The parenthetical reference to previous changes (example: page 1 of C 1) indicates that pertinent material wae pub

6、lished in that change. Page 3, paragraph 1.1 (page 1 of C 1). Change “AMSEL-MR-MP” to: AMSEL-MR-(NMP)- MA. Page 7, paragraph 6b(l), line 3. Change (fig. 1) to (fig. 88). Page 10, figure 2 (page 1 of C 1). After note 5, add note 6. 6. IN LATER EQUIPMENT BEARING ORDER NO. 64009-PP-63, CAPACITOR C2 HAS

7、 BEEN OMITTED. AN/PRC-25 Page 11, figure 3 (page 1 of C 1). After note 5, add note 6. 6. IN LATER EQUIPMENT BEARING ORDER NO. 64009-PP-63, R4 IS 68 0HM3 AND A MODULE GROUND STRAP HAS BEEN ADDED. Page 14, figure 5.1 (page 2 of C 1). Make the following changes: Near R12, add (NOTE 4). After note 3, ad

8、d note 4: 4. IN LATER EQUIPMENT BEARING ORDER NO. 64009-PP-63, THE VALUE OF R12 HAS BEEN FACTORY SELECTED AND MAY BE 37.4K, 38.3K, OR 39.2K 1%. TAGO 8344-A-April1 figure 10 figure 10.1 Page 20. TM5820-398-35-C2-1 Figure 10.1. 2 Page 43, paragraph 36a, (page 8 of C 1) chart. Delete the last line and

9、substitute: RF Millivolt- meter, Hewlett-Packard Model HP411A. Page 56, figure 31. Add the following note: Note. ON EQUIPMENT BEARING ORDER NO. 64009-PP-63, SWITCHES S2 AND S3 HAVE BEEN OMITTED. Page 60, paragraph 44, heading. After the head- ing, add the following note. Note. On equipment bearing O

10、rder No. 64009-PP-63, switches S2 and S3 are omitted. Removal of module Al 1, A17, A19, or A20 provides the same result as depressing switches S2 and S3. Page 71, paragraph 56c chart, Performance standard column. Make the following changes: Step No. 1: Change 2 watts to 1.6 watts. 2: Change 1,5 watt

11、s to 1.1 watts. Page 91, paragraph 63c, chart, Performance slandard column.Make the following changes: Step No. 1d: Change 300 kc to 250 kc. 1g: Delete and substitutel?requency should be at least 250 kc below 31.50 mc. The difference between the upper and lower frequency indications should be at lea

12、st 650 kc. Page 105, paragraph 67, chart, Performance standard column. Make the following changes: Item la, b, and c: Change 2 to 1.6. ld, e, and f: Change 1.5 to 1.1. 8a and b: Change 300 to 250. After Item 8, add the following note. Note. The difference between the two frequency indications should

13、 be at least 650 kc. TAGO 8344-A 3 Figure 61.1. Page 124, figure 61.Add figure 61.1 after figure 61: 4 TAGO 8344-A Page 151. Add chapter 6 after figure 79: CHAPTER 6 DEPOT INSPECTION STANDARDS 98. Applicability of Depot Inspection Stand-(2) ards The tests outlined in this chapter are designed (3) to

14、 measure the performance and capability of a repaired Radio Set AN/PRC2.5. Equipment that meets the minimum standards stated in the tests (4) will furnish satisfactory operation, equivalent to that of new equipment. 99. Applicable References a. Repair Standards. Applicable procedures of the U.S. Arm

15、y depot performing this test, and the depot standards for repaired signal equipment, form a part of the requirements for testing this equipment. b. Technical Publications. The following technical publications are applicable to Radio Set AN/PRC- 25: (1) TM 11-5820-398-10, Operators Manual. Equipment

16、TM 11-5820-398-20, Organizational Main- tenance Manual. TM 11-5820-398-35P, Field and Depot Maintenance Repair Parts and Special Tools List. TM 11-5820-497-35P, Field and Depot Maintenance Repair Parts and Special Tools List, Receiver-Transmitters, Radio RT-505/PRC-25 and RT-505A/PRC-25. c. Modifica

17、tion Work Orders. Perform all applica- ble Modification Work Orders pertaining to Radio Set AN/PRC-25 before making the tests specified. DA Pam 310-4 lists all available MWOs. 100. Test Facilities Required The following equipment, or suitable equivalents, will be employed in determining compliance w

18、ith the requirements of this Specific Standard. a. Test Equipment. Audio oscillator, Hewlett-Packard Model HP-200AB - Signal Generator, F. M., Marconi Model 1066A - Voltmeter, Meter ME-30A/U - Frequency Meter AN/USM-26- Spectrum Analyzer TS-723A/U - Oscilloscope AN/USM-50A - Modulation Meter ME-57/U

19、- Multimeter ME-26B/U - RF Wattmeter AN/URM-43A - Signal Generator AN/USM-44- RF Millivoltmeter Hewlett-Packard Model HP-411A - Power Supply, Trygon Model T20-2- b. Additional Equipment. Federal stock No. Technical manual. 6625-519-2384 - 6625-669-0742 6625692-6553 6625-668-9418 6625-668-4676 6625-6

20、47-3737 6625-542-6407 6625-635-9186 6625-669-4031 - - Enclosure, Electromagnetic, Shielding MX-1761/C - Tool Kit, Radar and Radio Repairman TK-87/U - Test Assembly, consisting of: (See fig. 79.6 for fabrication details.) Lamp, indicator, with push-to-test feature, 12 volts - Connector, Methode Type

21、No. SM-C-454687- Resistor, 150 ohms 5%, 1 watt, fixed, composition - Resistor, 1,000 ohms 1%, 1 watt, fixed, composition - Resistor, 10,000 ohms 5% variable, linear taper, composition - Resistor, 15,000 ohms 5%, 1 watt, fixed, composition - 1 1 1 1 1 1 1 1 1 1 1 2 TM 11-6625-320-12 TM 11-5057 TM 11-

22、5097 TM 11-5129 TM 11-6625-400-12 TM 11-6625-200-12 TM 11-5133 TM 11-6625-508-10 Federal stock No. o 4940-542-0002 5180-690-4452 - - 5905-683-2243 5905-892-6330 5905-892-6542 5905-102-2824 1 1 1 1 1 1 1 1 TAGO 8344-A5 Equipment Switch, tige, singl sheet metal 1 in. by 4 in., by 0.018 in. to 0.035 in

23、. (20 to 26 gage) - Test Gable No. 1, (fig. 79.1) consisting of: Clip, electrical, alligator style - Plug, pin(tist lead probe) - Wire, stranded AWGNo. l8- Test Cable No. 2 (fig. 79.1) consisting of: Cable RG-MA/U - Connector UG-88/U - Connector, General Wdiotype GR-874-C58A - Test Cable No. 3 (fig.

24、 79.1) consisting of: Cable RG-WA/U - Connector UG-21BlU - Connector, General Radio type GR-874-C58A - Test Cable No. 4 (fig. 79.2) consisting of: Cable RG-WA/U - Lugs, spade - Teat Cable No. 5 (fig. 79.2) consisting of: Cable R use the HP-200AB to externally modulate the 1066A. Without changing the

25、 RT-505/PRC-25 VOLUME control setting, determine the receiver audio output level produced with modulation frequencies of 300, 500, 2,000, and 3,000 cps (at 10-kc deviation). Ac- ceptable frequency response is +0, 6 db (from the 1,000-cps reference) at 300 cps, and +3,6 db at 500,2,000, and 3,000 cps

26、. c. Limiting Test (1) (2) (3) (4) Perform the limiting test with the equip- ment connected in a standard receiver test setup (para 102 and fig. 79.7), except set the RF signal level at the RT-505/PRC-25 coaxial ANT input to 1 microvolt. Adjust the 1066A frequency for minimum distortion as checked o

27、n the TS-723A/U. Increase the 1066A output to produce 100 millivolts at the RT-505/PRC-25 coaxial ANT input. Readjust the 1066A frequency for minimum distortion. The new audio output level on the TS-723A/U (used as a vacuum- tube voltmeter) must be within 3 db of the original setting (of 1 volt). d.

28、 Squelch Sensitivity and Retransmit Tests. (l) (2) (3) (4) (5) (6) Perform the squelch sensitivity and re- transmit test with the equipment con- nected in a standard receiver test setup (para 102 and fig. 79.7) except set the RF signal level at the RT-505/PRC-25 coaxial ANT input to 0.5 microvolt, t

29、he RT-505/PRC-25 function switch to SQUELCH, and modulate the 1066A simultaneously at 1,000 cps and 150 cps as described in (2) through (7) below. Set the 1066A SET MODULATION con- trol fully counterclockwise. Use a 10-second count on the AN/USM- 26 to adjust the output frequency of the HP-200AB to

30、150 Cps 1.5 cps. Set the HP-200AB output level to produce 3-kc deviation on the 1066A. Accurately determine and record the AMPLITUDE control setting. Set the HP-200AB AMPLITUDE con- trol fully counterclockwise. Adjust the 1066A SET MODULATION control to produce 10-kc deviation. TAGO 8344-A (7) (8) (

31、9) (l0) (11) Restore the HP-200AB ATTENUATOR setting to the position determined as noted in (4) above. Set the RT-505/PRC-25 function switch to RETRANS. The test assembly RE- TRANSMIT lamp should light and the TS-723A/U (used as a vacuum-tube volt- meter) should indicate receiver audio output. The R

32、ETRANSMIT lamp pro- vides a convenient method of monitoring operation of the squelch circuit. Momentarily set the RT-505/PRC-25 function switch to OFF then back to RETRANS to verify that the receiver will unsquelch (RETRANSMIT lamp lighted) with an RF input level of 0.5 microvolt. Slowly decrease th

33、e RF input level at the RT-505/PRC-25 coaxial ANT input to 0.35 microvolt. The receiver should re- main unsquelched. Disconnect the 1066A RF output from the (12) receiver coaxial ANT input. The receiver should squelch, the lamp associated with test cable No. 1 should go out, and the TS-723A/U (used

34、as a vacuum-tube voltmeter) should indicate no receiver audio output. Reduce the 150-cps modulation to zero and increase the 1,000-cps modulation to produce l5-kc deviation. Set the RF level at the RT-505/PRC-25 coaxial ANT jack to 10 microvolt. The receiver should not unsquelch. e. Catching Range T

35、est. (1) (2) Perform the catching range test with the equipment connected in a standard receiver test setup (para 102 and fig. 79.7), except set the 1066A and the RT-505/PRC-25 to 31.50 mc. Place the RT-505/PRC-25 upside-down for this test. Caution: Check to see that the RT- 505/PRC-25 is set to a f

36、requency ending in 50 ( XX.50 ) when disengaging the coupling in the procedure in (2) below; otherwise the coupling may become damaged. Disengage the mechanical coupling finger (fig. 3, TM 11-5820-398-20). This dis- ables the crystal switching assembly from module A10. To disengage the coupling, fab

37、ricate a tool from a piece of sheet metal that measures 1 by 4 inches and is between 0.018 and 0.035 inch thick (20 to 26 gage). Insert one end of the sheet metal tool into 17 the space between module Al0 and the brass wheel-like part of the coupling. (3) Adjust RT-505/PRC-25 to a frequency 50-kc hi

38、gher than its current setting. (4) Momentarily set the RT-505/PRC-25 function switch to OFF, then back to ON, and verify receiver audio output by observing the oscilloscope and the TS- 723A/U (used as a vacuum-tube voltmeter) indications. (5) Repeat the procedures given in (3) and (4) above until a

39、frequency setting produces no audio output within 3 seconds, or until a frequency of 31.95 mc is reached. Record the maximum frequency that pro- duces an audio output, (6) Adjust the RT-505/PRC-25 to 31.50 mc and repeat the procedures given in (3) and (4) above except reduce the frequency by 50 kc f

40、or each successive step until the audio output is not obtained or until a frequency of 31.00 mc is reached. Record the minimum frequency that produces an audio output. (7) Withdraw the decoupling tool and rotate the kilocycle frequency selector to 50 to re-engage the coupling. (8) Adjust the RT-505/

41、PRC-25 to 51.50 mc and disengage the coupling (2) above). (9) Repeat the procedures given in (3) and (4) above until a frequency produces no audio output within 3 seconds or until a frequency of 51.95 mc is reached. Record the maximum frequency that produces an audio output. (10) Adjust the RT-505/P

42、RC-25 to 51.50 mc and repeat the procedures given in (3) and (4) above except reduce the frequency for each successive step until the audio output is not . obtained or until a frequency of 51.00 mc is reached. Record the minimum frequency that produces an audio output. (11) Withdraw the decoupling t

43、ool and rotate the kilocycle frequency selector to 50 to reengage the coupling. (12) Evaluate the test results. At both test frequencies (31 .50 and 51.50 me), the mini- mum acceptable catching range is 650 kc with at least 250 kc on each side of the test frequency. f. Selectivity Test. (1) Perform

44、the selectivity test with the equipment connected in a standard re- ceiver test setup (para 102 and fig. 79.7), except disconnect test cabIe No. 9 from the 1066A output - and connect it to the AN/USM-44 output. Monitor the RF voltage at A21J3 with RF Millivoltmeter Hewlett-Packard Model HP-411A (HP- 411A). (2) Adjust the AN/USM44 for a 41.00-mc cw output at approximately 100 UV. (3) Tune the AN/USM-44 for a maximum indication on the HP-411A. (4) Increase the RF output of the AN/USM- 44 to the point where limiting just starts (where an increase in the AN/USM-44 output does not increase