BBV 9745 is a general purpose broadband preamplifier with high gain and low internal noise. Because of the high gain and the good noise figure the system noise is nearly independent of the other components including cable and receiver. These features make the BBV 9745 very useful for the measurement of very low limits. 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 ESD-sensitive 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.
Power supply is very simple because of the built-in voltage regulator. A standard wall plug supply with +12 V DC can be used. 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.
| Frequency range (nominel): | 9 kHz – 2 GHz |
| Noise figure: | typ. 2.5 dB (1.0 GHz) |
| Gain: | typ. +30 dB |
| Amplitude flatness: | < +/- 3 dB |
| 1 dB compression point at input: | > -20 dBm (87 dBµV) |
| Impedance: | 50 Ω |
| VSWR input / output: | < 2 : 1 |
| Ambient temperature: | -10°C … +60°C |
| Power supply: | + 12 (+/-2V) 120 mA |
| Material of the housing: | Aluminium |
| Housing dimensions: | 42 x 35 x 27 mm |
| Overall dimensions: | 82 x 38 x 27 mm |
| Weight: | 150 g |