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Tm-11-5820-890-20-1

• Chapter 1 Subject Introduction
  • D. Components Of Radio Sets.
  • An/Vrc-88a/D/F Short Range Radio With Dismount Equipment
  • 1.1. Scope
  • An/Vvrc-91a/D/F Short Range And Long Range Radio With Dismount Equipment
  • An/Vrc-92a/D/F Dual Long Range Radio
  • 1.2. Consolidated Index Of Army Publications And Blank Forms
  • 1.7. Nomenclature Cross-Reference List
  • Section Ii Principles Of Operation
  • 1.9. Dc Power Input And Distribution
  • Am-7239a/D Power Distribution
  • Am-7239e Power Distribution
  • (2) Placing Vaa Into Local Or Remote Mode (Am-7239a)
  • 9 Power Distribution In Power Amplifier Mount (Pa Mount)
  • 1.1o. Receive Signal Path
  • B. Analog Voice Transmit Signals
  • 1.12. Frequency Hopping Operation
  • 1.14. Rt Main Panel Displays
  • 1.15. A. Rt Self-Test (Rt-1523 Through Rt-152313)
  • 1.17. Power Amplifier
  • Section Iii Principles Of Maintenance Operation
  • 1.21. Post-Repair Use Of Operational Check
  • Section Iv Preparation For Storage Or Shipment
  • 1.26. Intermediate Storage
• Chapter 2 Manpack Radio
  • 2.1. Assembly Instructions. Cont
  • 2.2. Operational Check
  • Step 3. Rt Self-Test
  • Step 5. Transmitter Checks
  • Step 6. Receiver Checks
  • Step 8. Hrcrd Check
  • Variable Will Not Load. (Sheet 1 Of 1)
  • Low Or No Power Out. (Sheet 1 Of 1)
  • Loss Of Sidetone. (Sheet 1 Of 2)
  • Loss Of Sidetone. (Sheet 2 Of 2)
  • Radio Will Not Operate With Data Devices. (Sheet 1 Of 2)
  • Radio Will Not Operate With Data Devices. (Sheet 2 Of 2)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 1 Of 4)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 2 Of 4)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 3 Of 4)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 4 Of 4)
  • Rt Will Not Load Frequencies From Rcu. (Sheet 1 Of 1)
  • No Call Function At The Rcu. (Sheet 1 Of 1)
  • No Intercom Talk Function From Rcu To Rt. (Sheet 1 Of 1)
  • No Call Function At The Rt. (Sheet 1 Of 1)
  • No Intercom Talk Function From Rt To Rcu. (Sheet 1 Of 1)
• Chapter 3 Vehicular Radio Configurations
  • Important Points To Remember In Using The Operational Check
  • Step 2. Power Checks
  • Step 3. Rt Self-Test
  • Step 5. Transmitter Checks
  • Step 6. Receiver Checks
  • Step 8. Ls-671 Checks
  • Step 9. Rcu/Rt Self-Test
  • 3.2. Troubleshooting Flowcharts
  • Short Range Radio, Rt-A
  • Short Range Radio, Rt-B
  • Long Range Radio, Fit-A
  • Long Range Radio, Rt-B
  • Vaa Cb1 Trips When Set To “On”. (Sheet 1 Of 2)
  • Vaa Cb1 Trips When Set To “On”. (Sheet 2 Of 2)
  • Vaa Ds1 Not Lit When Cb1 Is Set To “On”. (Sheet 1 Of 4)
  • Vaa Ds1 Not Lit When Cb1 Is Set To “On”. (Sheet 2 Of 4)
  • Vaa Ds1 Not Lit When Cb1 Is Set To “On”. (Sheet 3 Of 4)
  • Vaa Ds1 Not Lit When Cb1 Is Set To “On”. (Sheet 4 Of 4)
  • Rt-A Ls-671 Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 1 Of 4)
  • Rt-A Ls-671 Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 2 Of 4)
  • Rt-A Ls-671 Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 3 Of 4)
  • Rt-A Ls-671 Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 4 Of 4)
  • No Remote Power From Rt-B Ls-671. (Sheet 1 Of 3)
  • No Remote Power From Rt-B Ls-671. (Sheet 2 Of 3)
  • No Remote Power From Rt-B Ls-671. (Sheet 3 Of 3)
  • Pa Mount Cb1 Trips And Vaa Ds1 Is Lit. (Sheet 1 Of 1)
  • Pa Mount Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 1 Of 3)
  • Pa Mount Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 2 Of 3)
  • Pa Mount Ds1 Not Lit And Vaa Ds1 Is Lit. (Sheet 3 Of 3)
  • Rt Display Does Not Light And Vaa Ds1 Is Lit. (Sheet 1 Of 1)
  • Rt Display Reads Fail 6. (Sheet 1 Of 1)
  • Comsec Alarm Not Heard At Handset Or Will Not Clear (No External Device). (Sheet 1 Of 3)
  • Comsec Alarm Not Heard At Handset Or Will Not Clear (No External Device). (Sheet 2 Of 3)
  • Comsec Alarm Not Heard At Handset Or Will Not Clear (No External Device). (Sheet 3 Of 3)
  • Comsec Alarm Not Heard Or Will Not Clear (External Devices Present). (Sheet 1 Of 5)
  • Comsec Alarm Not Heard Or Will Not Clear (External Devices Present). (Sheet 2 Of 5)
  • Comsec Alarm Not Heard Or Will Not Clear (External Devices Present). (Sheet 3 Of 5)
  • Comsec Alarm Not Heard Or Will Not Clear (External Devices Present). (Sheet 4 Of 5)
  • Comsec Alarm Not Heard Or Will Not Clear (External Devices Present). (Sheet 5 Of 5)
  • Variable (Comsec Or Fh Data) Will Not Load. (Sheet 1 Of 2)
  • Variable (Comsec Or Fh Data) Will Not Load. (Sheet 2 Of 2)
  • Failed Forward And Reverse Power Check. (Sheet 1 Of 3)
  • Failed Forward And Reverse Power Check. (Sheet 2 Of 3)
  • Failed Forward And Reverse Power Check. (Sheet 3 Of 3)
  • No Sidetone (Forward/Reverse Power Correct Rf Pwr In Hi). (Sheet 1 Of 1)
  • Forward Power Incorrect Thru Pa In Rf Pwr Hi. (Sheet 1 Of 2)
  • Forward Power Incorrect Thru Pa In Rf Pwr Hi. (Sheet 2 Of 2)
  • Rt-A: Less Than 30 W Forward Power Out Of Pa From 30 To 43 Mhz. (Sheet 1 Of 2)
  • Rt-A: Less Than 30 W Forward Power Out Of Pa From 30 To 43 Mhz. (Sheet 2 Of 2)
  • Rt-B: Less Than 30 W Forward Power Out Of Pa From 30 To 43 Mhz. (Sheet 1 Of 3
  • Rt-B: Less Than 30 W Forward Power Out Of Pa From 30 To 43 Mhz. (Sheet 2 Of 3)
  • Rt-B: Less Than 30 W Forward Power Out Of Pa From 30 To 43 Mhz. (Sheet 3 Of 3)
  • Rt-A: Less Than 30 W Forward Power Out Of Pa From Either 43 To 61.4 Mhz Or 61.4 To 88 Mhz. (Sheet 1 Of 1)
  • Rt-B: Less Than 30 W Forward Power Out Of Pa From Either 43 To 61.4 Mhz Or 61.4 To 88 Mhz. (Sheet 1 Of 2)
  • Rt-B: Less Than 30 W Forward Power Out Of Pa From Either 43 To 61.4 Mhz Or 61.4 To 88 Mhz. (Sheet 2 Of 2)
  • Rt Sig Display Incorrect With Rt Rf Pwr Switch Set To “Pa”. (Sheet 1 Of 2)Rt Sig Display Incorrect With Rt Rf Pwr Switch Set To “Pa”. (Sheet 1 Of 2)
  • Rt Sig Display Incorrect With Rt Rf Pwr Switch Set To “Pa”. (Sheet 2 Of 2)
  • Rt Sig Display Does Not Light When Ls-671 Ptt Is Pressed. (Sheet 1 Of 3)
  • Rt Sig Display Does Not Light When Ls-671 Ptt Is Pressed. (Sheet 2 Of 3)
  • Rt Sig Display Does Not Light When Ls-671 Ptt Is Pressed. (Sheet 3 Of 3)
  • No Sidetone Heard At Ls-671. (Sheet 1 Of 3)
  • No Sidetone Heard At Ls-671. (Sheet 2 Of 3)
  • No Sidetone Heard At Ls-671. (Sheet 3 Of 3)
  • Radio Will Not Operate With Data Devices. (Sheet 1 Of 2)
  • Radio Will Not Operate With Data Devices. (Sheet 2 Of 2)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 1 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 2 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 3 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 4 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 5 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 8 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 7 Of 8)
  • Rcu Display Reads “Open” During Self-Test. (Sheet 8 Of 8)
  • Rt Will Not Load Frequencies From Rcu. (Sheet 1 Of 1)
  • No Call Function At The Rcu. (Sheet 1 Of 2)
  • No Call Function At The Rcu. (Sheet 2 Of 2)
  • No Intercom Talk Function From Rcu To Rt. (Sheet 1 Of 2)
  • No Intercom Talk Function From Rcu To Rt. (Sheet 2 Of 2)
  • No Call Function At The Rt. (Sheet 1 Of 1)
  • No Intercom Talk Function From Rt To Rcu. (Sheet 1 Of 1)
• Chapter 4 Cables
  • 4.1. Troubleshooting Cables
  • 4.2. A. Schematics
  • B. Cg-3855 (Rf Cable)
  • D. Cx-13291 (Pa Control Cable)
  • E. Cx-13292 (Ls-671 Cable)
  • F. Cx-13298 (Rxmt Cable)
  • G. Cx-13300 (Intercom Cable)
  • H. Cx-13301 (M551 Power Cable)
  • I. Cx-13302 (Power Cable)
  • J. Cx-13303 (Power Cable)
  • K. Cx-13304 (Power Cable)
  • I. Cx-13305 (Power Cable)
  • M. Cx-13306 (Power Cable)
  • N. Cx-13308 (Data Cable)
  • O. Cx-13310 (Hyx-57 Cable)
  • P. Cx-13311 (Mst-20 Adapter Cable)
  • Q. Cx-13312 (Psc-3 Adapter Cable)
  • R. Cx-13313 (Vic Interface Cable)
  • S. Cx-13402 (Tacfire “Magic” Cable)
  • T. Cx-13417 (Splitter Cable)
  • U. Cx-13450 (Power Cable)
  • V. Cx-13465 (Digital Adapter Cable)
  • W. W4 (Audio/Data Fill Cable)
• Chapter 5 Component Replacement/Repair
  • D. Vehicular Antenna
  • G. Mounting Base
  • 5.2. Component Replacement
  • B. Rt-A Power Amplifier (Pa)
  • C. Vehicular Amplifier-Adapter (Wa)
  • D. Mounting Base (Mb)
  • E. Rt-B Pa
  • G. Loudspeaker (Ls-671) (Shelf Mount)
  • H. Loudspeaker (Ls-871) (Dashboard Mount)
  • I. Vehicular Antenna Elements
  • J. Vehicular Antenna Subassembly
  • 5.3. Component Repair
  • A. Receiver-Transmitter (Rt)(Rt-1523 Series) -Cont
  • B. Vehicular Amplifier-Adapter (Vaa) (Am-7239 Series)
  • C. Mounting Base (Mt-6352 Series
  • C. Mounting Base (Mt-6352 Series
  • C. Mounting Base (Mt-6352 Series)
  • D. Power Amplifier Mount (Pa Mount) (Mt-6353)
  • E. Loudspeaker Ls-671
  • F. Vehicular Antennas (As-3900)
  • G. Battery Box (Cy-8523a/B)
  • G. Battery Box (Cy-8523a/B) -Cont
  • G. Battery Box (Cy-8523a/B) -Cont
• Appendix A References
• Appendix C Expendable/Durable Supplies And Materials
  • Subject Matter Index
• Index Cont

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