Wireless Electronics for Communication


Posted on Feb 5, 2014

For all measurements with the oscilloscope, use the oscilloscope probe with the 10:1 attenuation to minimize measurement errors due to the capacitance of coaxial cable and the input resistance of the oscilloscope. Problem 1. The goal of this problem is to simulate, build and measure the Driver Amplifier (Q6) of the NorCal 40A transmitter. We


Wireless Electronics for Communication
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will closely follow Problems 21 and 22 in the book. The schematic of the Driver Amplifier is shown below with the parts used for this problem set highlighted (click on the schematic to enlarge it). Check also the NorCal 40A Assembly Manual for a complete schematic (last two pages of the manual). Run a transient analysis of the circuit for about 100 us with a sinusoidal input at 7 MHz. Adjust the dc offset and the amplitude of the sinusoidal input (representing the waveform generator) to obtain waveforms similar to the ones shown below. Check that you do not exceed an emitter current of about 50 mA at the transistor. 1. c Solder the components for the Driver Amplifier onto the NorCal 40A board. Then perform the measurements and caculations described in parts A, B, and C of Problem 21 in the book. Problem 2. The goal of this problem is to build and measure the Buffer Amplifier (Q5) of the NorCal 40A transmitter. We will closely follow Problem 23 in the book. The schematic of the Buffer Amplifier (Q5) and the 8V TX switch (Q4) is shown below with the parts used for this problem set highlighted (click on the schematic to enlarge it). Check also the NorCal 40A Assembly Manual for a complete schematic (last two pages of the manual). 2. b Solder the parts needed for the Buffer Amplifier (C36, C37, C38, C39, L6, Q5, R10, R11) and the 8V TX transistor switch (C57, D11, Q4, R9, R24) onto the NorCal 40A printed circuit board. At this...




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