Arduino SDR 3 FM using AD9850 on VHF amateur band

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The electret mic through a preamplifier is fed into the arduino input where it is frequency modulated and sent to AD9850 via hardware SPI. The DDS module outputs a FM signal at 21,3 MHz. Then a four diode mixer, mixes 125MHz from a crystal and the DDS output to provide the VHF amateur band. Transmitter only. Power is less than 100mW • More info, and programming code: • http://zissisprojects.wordpress.com/2...

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