Schwarzbeck BBV 9743 Broadband Preamplifier 10 MHz - 6 GHz

The BBV 9743 is a general purpose broadband preamplifier with high gain and low internal noise. The wide frequency range up to 6 GHz allows measurements acc. to CISPR 22. Due to the high gain and the low noise figure the system noise is nearly independent of the other components including cable and receiver. These features make the BBV 9743 very useful for the measurement of very low limits, as required for CISPR 25. In this case it will be connected directly to the antenna. The amplifier has 2 stages. The first stage uses an ESD – protected MMIC to prevent defects by unintentional electrostatic discharge. Nevertheless preamplifiers are generally ESDsensitive devices, therefore it is very important to discharge coaxial cables before being connected. This is an essential precaution to protect the extremely small semiconductor structures operating in the microwave frequency range.

It must be noted that the use of preamplifiers is generally not recommended for the measurement of impulsive signals. Such broadband noise is typical for many EMC measurements. This means that any broad-band preamplifier is not suitable for EMCmeasurement of a broadband pulse spectrum.

The BBV 9743 has an aluminium enclosure and uses N-Type flange connectors. A standard wall plug supply with +12 V DC output can be used. A suitable power supply for 230 V with Schuko socket is included in the delivery. The use of switching power supplies is not recommendable as they may cause higher levels of interference. An internal protection circuit slows down the rising and falling edge of the power supply voltage to prevent internal components and the receiver from being damaged by voltage spikes. 12 V auxiliary supplies from receivers and analysers or batteries are also suitable if they can provide a cont. current of 0.13 A.