aerial booster - effective frequency range 80 … 800 MHz

2-04 — elektor february 1980 aerial booster The design targets for this novel aerial amplifier were; low noise, ample gain, wide dynamic range, wide frequency range and last, but by no means least, the possibility of using the same printed circuit board for both wide and narrow passband versions. Aerial booster performance largely depends on the characteristics of its active elements It is self-evident that high quality transistors are absolutely essential in the design for a high quality booster, to skimp on this specification is false economy. Although passive elements are equally important in the construction of amplifier will behave satisfactorily in most applications. The BC 177 transistor in figure 1 serves merely to stabilise the collector supply of the BFT 66 to a working level of approximately 6.5 V to give a collector current of 3.7 mA. The graphs of figures 5 and 6, taken from the aforementioned data sheets, show the noise and intermodulation 12 60nH BFT 65 (BFT 67) 8...