HP Second Converter A3A4 5086-7819HP Agilent A3A4 Second Converter Assembly (50867819)A modular downconverter board from the HP 8590 series spectrum analyzers. It translates intermediate frequencies (IF) down to baseband for demodulation, enabling coverage from HF through Lband. Key Specifications Frequency Range: 10 MHz1. 5 GHz input IF Output IF: 3060 MHz fixed Conversion Gain: 10 dB typical Noise Figure: < 8 dB Connectors: SMA RF in out, ribboncable digital control Power: +12 V DC