The JPF-21E Series from Crane Aerospace & Electronics is a Modulator with RF Frequency 10 to 1000 MHz, Insertion Loss 6 to 9 dB, Amplitude Balance 0.5 to 1 dB, Current -15 to 15 mA, Phase Balance ±1 to 5 Degree. Tags: Flat Pack. More details for JPF-21E Series can be seen below.