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RF

 

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Quick view of 500kHz to 4 MHz Converter 500kHz to 4 MHz Converter This converter allows reception of signals below 500 kHz on a 3.5 ? 4 MHz HF receiver. It should therefore be useful for those with receivers that do not receive the lower frequencies. Again the converter uses the popular NE602 mixer/oscillator chip. A cheap 4 MHz crystal provides the local oscillator tuning. Note that tuning is backwards ? 100 kHz corresponds with 3.9 MHz and 500 kHz with 3.5 MHz. If your receiver tunes above 4 MHz, the 4 ? 4.5 MHz range will provide forwards tuning, making it easier to ascertain the frequency of an unknown station. The mixer is preceded by a low pass filter to attenuate strong local broadcast stations above 500 kHz...
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Quick view of 10MHZ to 1MHz converter 10MHZ to 1MHz converter This circuit is an oscillator at frequency 10MHZ, using IC 1A and IC1B and a frequency divider. Using the IC2 it divides the pulses to 10. IC1C is a buffer. The variable capacitor 39pF is microtunig the frequency . The pin 12 of the IC2 is the output, where we can have the 1 MHz . The circuit does not need any adjustments to work...
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I designed this circuit. It can be connected to an FM tuner to play FM stations on an AM radio...
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The FM broadcast band was moved immediately after World War II from its original spot just below 50 Mc to the present 88-108 Mc band. Hallicrafters was one company to offer receiving converters for those who had the old FM radio sets. The offerings included a one-tube converter that fits inside a console and draws power from the audio output tube socket (using an adapter)...
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This converter allows reception of six metre signals on a two metre receiver. It should therefore be useful for those with single or dual band sets that do not cover 50 MHz...
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