4.5-10Mhz Superheterodyne RCVR
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Cell phones aren’t the only devices to benefit from ever- smaller and more highly integrated communications-IC technology. The simple, three-IC superheterodyne radio in Figure 1 can receive stations in the 4.5- to 10-MHz range from around the world with only a 10-ft antenna. A superheterodyne radio works by mixing the incoming RF signal with a local-oscillator (LO) signal to produce an IF. We don’t need to spell it out. The circuit then filters, amplifies, and diode-detects the IF signal to reproduce the audio signal contained in the RF input.
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More about RF circuit
Wideband VHF/UHF/SHF 22dB PREAMP by MAR-6
Read More Source:
http://www.edn.com/archives/1996/080196/16di6.htm
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