  We have developed and tested a direct-sampling RF receiver capable of
measuring the amplitude of a 1497 MHz sinusoidal signal in 0.5 ms integration
windows to within <10 ppm relative uncertainty. The receiver is intended for
measuring signals from beam current monitoring cavities on the beamline of the
Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Laboratory.
The signal strength, frequency, and integration window are consistent with the
thus far unmet requirements of the upcoming MOLLER experiment to measure the
beam charge for different helicity states.
