  Next generation radio telescopes, such as the Square Kilometre Array (SKA)
and Next Generation Very Large Array (ngVLA), require precise microwave
frequency reference signals to be transmitted over fiber links to each dish to
coherently sample astronomical signals. Such telescopes employ phase
stabilization systems to suppress the phase noise imparted on the reference
signals by environmental perturbations on the links; however, the stabilization
systems are bandwidth limited by the round-trip time of light travelling on the
fiber links. A phase-locked Receiver Module (RM) is employed on each dish to
suppress residual phase noise outside of the round-trip bandwidth. The SKA RM
must deliver a 3.96 GHz output signal with 4 MHz of tuning range and less than
100 fs of timing jitter. We present an RM architecture to meet both
requirements. Analytical modelling of the RM predicts 30 fs of output jitter
when the reference signal is integrated between 1 Hz and 2.8 GHz. The proposed
RM was conceived with best practice electromagnetic compatibility in mind, and
to meet size, weight and power requirements for the SKA dish indexer. As the
ngVLA reference design also incorporates a round-trip phase stabilization
system, this RM may be applicable to future ngVLA design.
