Telemetry, Tracking, and Command Subsystem
This diagram shows the connectivity between units in the TTC subsystem. Click on an area of this image to obtain a more detailed view of the units of interest.
Ulysses occasionally uses an S-band downlink in addition to the prime X-band downlink. This extra signal is used to gather Radio Science data. The S-band downlink is shown by the gray line running from Transponder 1, to the RFDU; from here it follows the uplink path to the HGA. The Transponder 1 S-band output is not used during routine operations.