  There are many stages in the LLRF and RF system development process for any
new accelerator that can take advantage of hardware emulation of the high-power
RF system and RF cavities. LLRF development, bench testing, control system
development and testing of installed systems must happen well before SRF
cavities are available for test. The PIP-II Linac has three frequencies of SRF
cavities, 162.5 MHz, 325 MHz and 650 MHz and a simple analog emulator design
has been chosen that can meet the cavity bandwidth requirements, provide tuning
errors to emulate Lorentz force detuning and microphonics for all cavity types.
This emulator design utilizes a quartz crystal with a bandwidth of 65Hz at an
IF of ~ 4 MHz, providing a Q of ~ 1.3 x 10^7 at 650MHz. This paper will discuss
the design and test results of this emulator.
