The SMS-201 from Synergy Microwave Corporation is a Modulator with RF Frequency 28.5 to 31.5 MHz, RF Frequency 28.5 to 31.5 MHz, LO Frequency 28.5 to 31.5 MHz, IF Frequency DC to 15 MHz, Conversion Loss 8 dB. Tags: Surface Mount. More details for SMS-201 can be seen below.