RF

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...

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...

I designed this circuit. It can be connected to an FM tuner to play FM stations on an AM radio...

No Description available...

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)...

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...