(Solved): RF Wireless Communications Figure 1. Guglielmo Marconi Midday at Signal Hill near St. Johns, N ...

RF Wireless Communications Figure 1. Guglielmo Marconi Midday at Signal Hill near St. John’s, Newfoundland, in Canada, Guglielmo Marconi pressed his ear to a telephone headset connected to an experimental wireless receiver. About 1,700 miles away at Poldhu, Cornwall, in England, his coworkers were about to send the Morse code letter s, which is three dots. Faintly, but clearly “psht-psht-psht” pause “psht-psht-psht” came through the earphone. The date was December 12, 1901, and the first transatlantic message had just been sent and received. Goal In this lab, use a wire antenna to send a message and other waveforms over a wireless radio frequency (RF) link. The NI ELVIS II function generator is the transmitter and a high-gain op amp is the receiver. The classic message is formulated using the NI ELVIS II arbitrary waveform generator. Required Soft Front Panels (SFPs) • Oscilloscope (Scope) • ArbitRF Wireless Communications Figure 1. Guglielmo Marconi Midday at Signal Hill near St. John’s, Newfoundland, in Canada, Guglielmo Marconi pressed his ear to a telephone headset connected to an experimental wireless receiver. About 1,700 miles away at Poldhu, Cornwall, in England, his coworkers were about to send the Morse code letter s, which is three dots. Faintly, but clearly “psht-psht-psht” pause “psht-psht-psht” came through the earphone. The date was December 12, 1901, and the first transatlantic message had just been sent and received. Goal In this lab, use a wire antenna to send a message and other waveforms over a wireless radio frequency (RF) link. The NI ELVIS II function generator is the transmitter and a high-gain op amp is the receiver. The classic message is formulated using the NI ELVIS II arbitrary waveform generator. Required Soft Front Panels (SFPs) • Oscilloscope (Scope) • Arbitrary waveform generator (ARB) Required Components •1 k? resistor (brown, black, red) • 100 k? resistor (brown, black, yellow) • 741 op amp (or equivalent) • 7408 digital IC Exercise 1 The Transmitter Complete the following steps to build a simple transmitter antenna from a wire: 1. Connect a wire to the output of the function generator. When FGEN is running, the output voltage leaks from the pin socket to the antenna and radiates a small RF signal. A similar antenna about an inch away can pick up this signal and amplify it to a higher signal level. 2. Initially, use a sine wave to test the transmitter by setting the SFP function generator to sine waveform, 5 V amplitude, 2.5 V DC Offset, and 20 kHz frequency. 3. Place a receive antenna about an inch away and verify that you can are receiving the signal by displaying the received signal on an oscilloscope. The signal may be very weak, but should be present. If needed, place the antennas closer to each other. As you adjust the frequency from the Function Generator, you should see the signal on the receive antenna change. End of Exercise 1