AD831 High Frequency Transducer RF Mixer Module 500MHz Bandwidth Mixing Down Mixing Dual Balanced Mixer Single Chip Radio Frequency Converter -10dBm: Amazon.com: Industrial & Scientific
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Passive Frequency Mixer (MIX3P7G10G) 3.7G - 10GHz RF and DC - 4G IF - LOTUS COMMUNICATION SYSTEMS, INC.
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Amazon.com: Radio Frequency Mixer, Microwave Radio Frequency Double Balanced RF Mixer RFin=1.5-4.5GHz RFout=DC-1.5GHz LO=312 Voice Modulator Frequency Converter : Electronics