Citation
Abstract
A new configuration for ground system range calibrations with the zero delay device (ZDD) was recently implemented at DSS 14 for the S/X experiment. In this new configuration, the original ZDD horns and associated air paths are eliminated. The uplink test signal is now coupled out of the transmitter waveguide path and brought directly to the ZDD by calibrated cables of known delays. The downlink signals generated by the ZDD are injected directly into the masers via calibrated cables and waveguide couplers. Preliminary tests on the new system indicate that, in the absence of the air path, the ground system range change as a function of antenna elevation angle is typically less than 3 ns at S-band and X-band.
Details
- Volume
- 42-20
- Published
- April 15, 1974
- Pages
- 57–63
- File Size
- 459.7 KB