By Steve Ciarcia, Editor
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Additional resources for Circuit Cellar December, 2010
As is often the case, the measurements seemed strange at first. Interestingly, the second time around they turned out to be exact. Figure 1—This simple simulation, done with the QUCS Simulator, shows the behavior of a perfect capacitor. The current INET and voltage UNET across the resistors are measured with virtual meters, and then the capacitor impedance is calculated as Z = U/I. As you can see, the plots on the right show the impedance magnitude (top) and phase (bottom) when the frequency is increased from 1 to 20 MHz.
As nearly as I can tell, 43 packets arrived and at most four were lost, giving a very accurate record of my progress along the convoluted route. The amateur radio packet network depends on many digipeaters, each with a relatively small coverage area, that relay packets to their destinations. One of my packets on that ride went through K2DLL-2 (located about 12 miles west of K2DLL-12), KA2QYE-10 (40 miles south along the Hudson River), and then to WA2MHV-6 (another 50 miles downriver in Poughkeepsie).
These values are then used to look up the file locations that contain the compressed encoded bytes, which represent its associated sound bite. These sound bites are then decoded and used to modulate the duty cycle of the PWM signal sent on the OC pin. The output of the OC pin (RB6) is passed through the fourth-order low-pass filter. This filter removes the high-frequency PWM component of the signal so all that remains is the low-frequency audio created by the modulation. ” RESULTS I used the Sig Manufacturing LT-40 model for the airborne testing of the downlink module.