Vintage Hewlett-Packard Model 342A Noise Figure Meter, made in the USA. This classic RF test instrument measures noise figure in dB using selectable gas tube or diode noise sources, with a front-panel analog meter displaying both Noise Figure (dB) and Current (mA).
Features include:
Meter Function selector: Calibration Zero/INF, Noise Figure, Current (4mA / 2mA)
Noise Source selector: Gas Tube, Off, Diode
Individual Gas Tube and Diode current controls
Input (MC) frequency selector
Hewlett-Packard analog meter movement
This unit has been specifically tuned for 28 MHz operation, making it well-suited for amateur radio (10-meter band) amplifier noise figure testing. Sold as-is in used/vintage, untested condition. A rare find for the RF engineer, ham radio operator, or vintage test equipment collector.
