Citation
Abstract
While the Data Decoder Assembly (DDA) has met the required goals of the decoding and processing of telemetry data in the DSN, it has exhibited a higher than desired failure rate. These failures were predominately of an intermittent nature and occurred more consistently in the controlling processor, the Interdata Model 4 (ID4) minicomputer. General lack of mechanical rigidity and the electromechanical construction used on the selector channels were determined to be the main contributors to these intermittent failures. These weaknesses in design initiated the bulk of the problems by causing connector contacts to become intermittent during operation. Mechanical redesign of the ID4 front panel hinges and a design for a cabinet strut stiffener were implemented in the DSN. Newer design, more reliable selector channels were purchased and installed in all ID4s in the DSN. These changes significantly reduced the failure rate; however, there still remains a much lower failure rate, the source of which is being investigated.
Details
- Volume
- 42-21
- Published
- June 15, 1974
- Pages
- 92–94
- File Size
- 308.3 KB