The FM021814 from Mercury Computer Systems Inc., Chelmsford, MA, is a digital frequency discriminator (DFD) with phase modulation on pulse (PMOP) detection. The device monitors the 2.0 to 18 GHz band instantaneously and measures the frequency of pulses as short as 50 ns, with an RMS frequency accuracy of 3.0 MHz. Phase data can be sampled on command at 80 MHz with 8-bit resolution or delivered as continuously streaming information at 40 MHz. Applications include radar warning, electronic counter measure, and electronics intelligence applications.