zero crossing detector

Designing a preamp for the VHF waveband (around 100 MHz) is not always an easy matter. This circuit, however, is both relatively simple to use and is inexpensive. It has the advantage of a fairly large bandwidth (2 MHz) and good noise figure (2.5 dB). The preamp has a large dynamic range and a gain of 20 dB at a frequency of 144 MHz.