AMK 50Ω Broadband Frequency Multipliers Mini-Circuits AMK 50Ω Broadband Frequency Multipliers offer low conversion losses (11.4dB or 14.5dB typical) and high rejection. The aqueous washable AMK components operate within a -40°C to +85°C temperature range. Mini-Circuits AMK 50Ω Frequency Multipliers are ideal for synthesizers, local oscillators, and satellite up/down converters.