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#20
October 10th 14, 10:39 AM
posted to rec.radio.amateur.homebrew
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Frequency accuracy in older RXs
Peter Able stuck@home wrote in news:ks2dncC5fJrIAqrJnZ2dnUVZ7s-
: Fine, but first find a microcontroller with such a fast (minimum 60MHz) DAC. Even if you do you'll spend many times the cost of a simple microcontroller plus DDS chip system - and you won't rival the cheaper system's performance until your DAC can work at several times 60MHz. Good point. Almost certainly easier to just send step size from CPU to the accumulator in fast hardware. The step size needs changing far less often than it needs stepping. |
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