The Hewlett-Packard Model 11729C Carrier Noise Test Set is an integral part of a phase noise measurement system. The Carrier Noise Test Set can perform the following operations: • Up converts an external (or internal) reference signal. • Down converts the signal under test to an intermediate frequency (IF). • Phase demodulates the phase noise of the test signal using the Phase Detector Method. —When the Phase Detector Method is used the signal under test is phase locked to a reference signal. —The signal under test is then phase detected against the same reference signal. • Frequency demodulates the phase noise of the test signal using the Frequency Discriminator Method