Agilent / HP 5255A

The Agilent 5255A is a Frequency Converter. This converter is designed to extend the range of the Agilent 5254L and 5256L counters from 3 to 12.4GHz . The 5255A can be used as a direct counting prescaler from 1 to 200MHz.
The input voltage range is 100 mV to 0.7 V with an input impedance that is 50 ohms with a type N (F) input connector.