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INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - -
SUMMARY
A. Pertinent Flight Data and Supporting Information . . . . . . . . . . .
1. Inadvertent Turn-On . . . . . . . . . . . . . . . . . . . . . . . .
2. Boost Environment . . . . . . . . . . . . . . . . . . . . . . . . .
3. Terminal Phase . . . . . . . . . . . . . . . . . . . . . . . . . -
4. TV Subsystem Command/Control Circuit . . . . . . . . . . . . .
5. TV Subsystem Operation in Critical Pressure Environment
B. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Preventive Measures . . . . . . . . . . . . . . . . . . . . . . . . . .
RA - 6 SPACECRAFT FLIGHT SEQUENCE
A. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Flight Sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Channel 8 Telemetry Events . . . . . . . . . . . . . . . . . . . . . .
boost PHASE Environment and Prer Licht testing
A. Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Boost Phase Vibration . . . . . . . . . . . . . . . . . . . . . . . . .
l. Boost Phase Environment . . . . . - - - - - - - - - - - - - - - -
2. Environmental Data . . . . . . . . . . . . . . - - - - - - - - - -
C. Ranger 6 Vibration Flight Acceptance Testing . . . . . . . . . . . . .
1. Low Frequency Sine Sweep . . . . . . . . . . . . . . . . . . . . .
2. High Frequency Sine Sweep (axial and lateral) . . . . . . . . . .
3. Noise Test (axial and lateral) . . . . . . . . . . . . . . . . . . .
channe L. 8 TELEMETRY
A. Periods Investigated . . . . . . . - - - - - - - - - - - - - - - - - - -
B. Pertinent Data and Observations . . . . . . . . . . . . . . . . . . . .
*C. Analysis and Conclusions . . . . . . . . . . . . . . . . . . . . . . . .
1. Inadvertent Turn-On . . . . . . . . . . . . . . . . . . . . . . . .
2. Terminal Mode . . . . . . . . . . . . . . . . . . . . . . . . . . .
3. Flight Simulation Test . . . . . . . . . . . . . . . . . . . . . . .
4. Summation . . . . . . - - - - - - - - - - - - - - - - - - - - - - -

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4- 1 4-l 4-2 4-2 4-10 4-10 4-10 4-1 1

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Section Page vi Ana LYSIS OF Failure MECHanisms A. Loss of RF Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1 B. Loss of RF Producing Capability . . . . . . . . . . . . . . . . . - - - - - - - - 6-2 C. Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - - - 6-3 vii. PREventive Measures A. Command Circuits 7 - 1 l High Current Voltage Regulator (HCR). . . . . . . . . . . . . . . . . . . 7 - 1 2 Distribution Control Unit (DCU) . . . . . . . . . . . . . . . . . . . . . . . 7- 3 3 Command Control Unit (CCU) . . . . . . . . . . . . . . . . . . . . . . . . 7- 3 4. Command Circuits Ground Lockout . . . . . . - - - - - - - - - - - - - - - 7- 3 5 Command Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7- 3 6 Alternate Switching Technique 7-3 B. Umbilical Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4 C. Telemetry . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5 1. The 90 Point Telemetry Changes . . . . . . . . . . . . . . . . . . . . . . 7-5 2. The 15 Point Telemetry Changes . . . . . . . . . . . . . . . . . . . . . . 7-8 D. Other Preventive Measures 7-9 l. Thermal Control . . . . . 7-9 2. Packaging . . . . . . . . . . . . . . . . . . . . - - - - 7-9 3. Parts Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - - - - - 7-9 4. Quality Assurance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9 5. Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1 o Appendix A. REDUCTION OF CHANNEL 8 TELEMETRY DATA A. Equipment and Magnetic Tapes Used . . . . . . . . . . . . . . . . . . . . . . - A-l B. Reading Accuracy and Technique . . . . . . . . . . . . . . . . . . . . . . . . . A-l b ANALYSIS OF CHANNEL 8 OPERATION DURING BOOST A. Powering the Low Current Regulator (LCR) by Stepping the Command Switch to Warmup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 B. Cruise Mode Telemetry Turn-On During Launch Phase . . . . . . . . . . B-4 1. Question 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-4 2. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5

3. Question 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-5 CONTENTS (cont)

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Appendix Page Bicont) 4. Conclusion B-5 5. Question 3 ro-5 6. Conclusion B-6 7. Question 4 B-7 8. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-7 C. System Turn-Off Via the Power Control Unit B-9 D. Possible De-Mated Connectors. . . . . . . . . - - - B-9 E. Analysis of Umbilical Wires . . . . . . . . . . . . . . . . . . . . . . . . . . . . B-1 1 c CHANNEL 8 NOISE analysis A. Noise on Channel 8 Telemetry During Inadvertent Turn-On . . . . . . . . C-l B. Tests Performed on the Command Switch and on the 1 5 Point Commutator . . . . . . . . . . . . . . * - - - - - - - - - - - - - - - - - - - C-4 1. Test Performed on a 15 Point Commutator to Determine its Speed Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-4 2. Test Performed on the Telemetry Regulator and the VCO Combination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - C-5 3. Test on the Command Switch . . . . . . . . . . . . . . . . . . . . . - - - - C-5 C. Flight Data Encoder C-6 1. JPL Channel 4 Frequency Transients C-6 2. PTM and Laboratory Investigations C-6 D. Results of Flight Data Encoder Frequency Shift Investigation. . . . . . . C-7 1. RF Carrier Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - - C-7 2. High Voltage DC Arc Test . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7 d ANALYSIS OF AGENA SHROUD PRESSURES . . . . . . . . . . . . . . . . . . . . D-1 e analysis or arcing POTENtials at REDUCED PRESSURE A. Material Outgassing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E - 1 B. Paschen's Law . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E - 1 F Ra - 6 DYNAMIC Environment DURING BOOST A. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1 B. Effect of Diaphragm and Mounting Block Changes on the Measured Flight Vibration of RA-6 as Compared to RA 1-4. . . . . . . . . . . . . . . F - 1 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1

2. Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . F-1 3 Appendix

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CONTENTS (cont)

3. Data Analysis . . . . . . . . - - - - - - - - - - - - - - - - - - - -
4. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5. Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

EVALUATION OF THE COMMAND DECODER RELAY's under
vibration

A. Acceleration Tests . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Effect of Relay Closures on TV and CC&S Subsystems . . . . . . . .
1. Television Subsystem . . . . . . . . . . . . - - - - - - - - - - -
2. CC&S Subsystem . . . . . . . . . . . . . . . . . . . . . . . . . .
C. Summary . . . . . . . . . . . . . . . . . - - - - - - - - - - - - - - -

TV subsystem TURN-On ANALYsis

A. Sensitivity of the Command Switch . . . . . . . . . . . - - - - - - - -
B. Command Switch Stepping Rate . . . . . . . . . . . . . . . . . . -
C. Control Circuitry Susceptibility to High Voltage Discharges . . . . .
1. SCR Circuitry Tests . . . . . . . . . . . . . . . . . . . . . . . .
2. Command Switch Tests . . . . . . . . . . . . . . . . . . . . . . .
D. Analysis of RA-6 TV Subsystem Turn-On Circuit . . . . . . . . . . .
E. RA-6 PTM Test No. 1 Summary . . . . . . . . . . . . . . . . . . . .
F. Special PTM Tests . . . . . . . . . . . . . . . . . . . . . . . . . . .
PERFORMANCE EVALUATION OF SPACECRAFT BUS . . . . . . . . - -

THERMAL considerations

A. Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B. Conclusions . . . . . . . . - - - - - - - - - - - - - - - - - - - - - - -
1. High Temperature Investigation . . . . . . . . . . . . . . . . . .
2. Investigation of Thermal Conditions Due to Environment . . . . .

SEARCH AND ANALYSIS OF RECEIVED TELEMETRY SIGNAL LEVELS

A. Expected Received Signal Levels in Warmup and Reduced Power . . .
Search for Coherent Signal . . . . . . . . . . . . . . . . . . . . . . .
Search for Incoherent Signal . . . . . . . . . . . . . . . . . . . . . .

Venus Site Computer Analysis . . . . . . . . . . . . . . . . . . . . .

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Conclusions in Search of Magnetic Tapes for RA-6 Signal . . . . . . .

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Appendix

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CONTENTS (cont)

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