The Sentinel 3 from PPM Test is a RF Over Fiber Module with Frequency Range 50 Hz to 1.5 GHz, Optical Wavelengths 1310 nm, Noise Figure 4 to 8 dB, P1dB 20 dBm, Gain Flatness ±1.25 dB. Tags: Rack Mount/Benchtop, Transceiver. More details for Sentinel 3 can be seen below.