Table 1 of this document gives Spacecraft Transponder Turnaround Ratios that are supported by the Deep Space Network. These are the PLL controlled divide-by ratios that a spacecraft uses when receiving a carrier frequency from the DSN and retransmitting a different frequency back to Earth which is still phase-coherent, for the purposes of precise doppler shift measurements as part of a determination of a (usually deep space) spacecraft's trajectory. Read more about this in this question.
Some of the supported ratios are within-band and close to unity; X to X-band, Ka to Ka-band and S to S-band. This means that the spacecraft must simultaneously receive a very weak signal and transmit a very strong signal at frequencies that are very close, and this requires more frequency rejection in the spacecraft's receive circuit.
Question: Are there any deep-space spacecraft which actually support within-band turn-around for Earth-based doppler measurements? Are these spacecraft using one dish for simultaneous receive and transmit within the same band?
