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  Main » Radio Frequency

This project uses an Atmel at90s2313 AVR processor to measure resistance values and generate R/C style pulses suitable for driving servos or testing R/C controlled robots without the transmitter.  It measures four channels and provides four R/C style pulses.  It uses an LCD display to indicate the current pulse width and to indicate when the board is in CALIBRATE mode.  Analog joysticks, by their nature, are highly variable so the tether unit needs to be calibrated for the particular joystick.  Once calibrated it appears to be quite stable: pulse width values stay within a few microseconds over several days of operation at room temperatures.  ... Read more »
Category: Radio Frequency | Views: 3366

The project tries to reuse a tuner in order to create a TV receiver with 45-860MHz super scanner and a step size of 0.01Hz.
A digital type of TV or VCR tuner is the heart of this receiver wherein through the I2C interface, the received frequency is programmed into the tuner. A second mixer using DDS as oscillator was added because the smallest step size of a tuner is 31.25kHz, 50kHz, or 62.5kHz, which is too wide for narrow band signals. This DDS configuration can perform the smallest step size of 0.01Hz.  ... Read more »
Category: Radio Frequency | Views: 13366

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