It’s an unfortunate side effect of proximity to a large transmitter that the received signal can overload a receiver’s front end even when tuned to other frequencies. [Rfrht]’s had this problem with nearby FM broadcast transmissions overloading the 2 metre and 70 centimetre amateur bands. The solution? Design and build a bandpass filter. This allows the signals you want to pass through while rejecting or attenuating out-of-band frequencies. The resulting PCB is very nice indeed.
On board, aside from the filters themselves, are a low-noise preamplifier and relays to switch between receive and transmit. Everything is controlled by logic-level signals. All components are surface-mount, and the PCB layout clearly takes special care with RF routing.
We can honestly say there have been times in the past when we could have used this project. Unfortunately, our filters, built Manhattan-style, weren’t anywhere near as elegant as this one. If you want a filter and can’t build this project, consider a filter prototyping board.
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This articles is written by : Nermeen Nabil Khear Abdelmalak
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