BBV 9743 B

The Schwarzbeck BBV 9743 B is a general-purpose broadband preamplifier covering 10 MHz to 6 GHz, designed to deliver high gain and low internal noise for EMC radiated emissions measurements against very low limits. With a typical gain of 28 dB, amplitude flatness of less than ±3 dB, and a noise figure of less than 2.7 dB at 1 GHz, the BBV 9743 B makes overall system noise nearly independent of downstream components — including cables and the receiver — making it particularly effective when connected directly to the antenna at the measurement site.

Like the BBV 9745, the amplifier uses a two-stage design where the first stage employs an ESD-protected MMIC to guard against damage from unintentional electrostatic discharge. Coaxial cables should still be discharged before connection as an essential precaution to protect the sensitive semiconductor structures operating in the microwave frequency range. Key specifications include a 1 dB input compression point of greater than -18 dBm (89 dBµV) and input/output VSWR of less than 2:1.

Power is supplied at +10–15 VDC at 120 mA via a standard wall plug supply — the built-in voltage regulator eliminates the need for additional power conditioning. The compact aluminum enclosure measures 82 × 38 × 27 mm (overall) with a housing block of 42 × 35 × 27 mm, and weighs 150 g. Operating temperature range is -10°C to +60°C. The recommended power supply accessory is the Schwarzbeck PS 230/12.