Reception of FM Signal에 관한 통신실험 결과 보고서
- 최초 등록일
- 2010.11.30
- 최종 저작일
- 2007.10
- 4페이지/
한컴오피스
- 가격 1,000원
소개글
Reception of FM Signal에 대하여 실험한 결과보고서 입니다.
컴퓨터내의 디지털 오실로스코프 파형과 그에 관한 설명이 포함되어 있습니다.
목차
Exercise 1. The Fixed-Frequency Receiver
2. Adjust the OUTPUT LEVEL of the RF Generator to 50% clockwise.
3. Measure the upper and lower frequency limits of the RF Generator at which reception is no longer possible. This limit corresponds to a signal at the NBFM AUDIO OUTPUT which is so that it is no longer visible on the oscilloscope.
4. Set the frequency of the RF Generator to 10.700MHz. The demodulated signal can be seen on the oscilloscope.
Connect the True RMS Voltmeter/Power Meter to the RF OUTPUT of the RF Generator. Reduce the OUT PUT LEVEL of the RF signal. How does the signal vary?
5. Adjust the OUTPUT LEVEL of the RF Generator to MIN. For each value shown in Table 6-1, note the amplitude of the signal at TP 15.
6. Adjust the frequency of the RF Generator 10.685MHz. Slowly increase the frequency of the RF Generator in 15 steps until you reach approximately 10.715MHz. Record each obtained carrier frequency and the corresponding signal amplitude at TP2 in Table 6-2.
7. Plot these measurements directly onto Figure 6-10, and trace the S-curve of the crystal discriminator through the plooted points.
본문내용
Slowly vary the frequency using the frequency control of the RF Generator. How does the 1.5 kHz signal vary with the frequency of the RF signal?
⇒10.690~10.720 MHz의 주파수에선 sine wave가 발생되었다. 반면 그 외의 다른 영역의 주파수를 관찰하여 보면 어떤 파형도 관찰할 수 없었다. 실험 결과 RF Filter이 다른 영역의 주파수를 차단하는 역할을 하고 있다는 것을 알 수 있었다.
3. Measure the upper and lower frequency limits of the RF Generator at which reception is no longer possible. This limit corresponds to a signal at the NBFM AUDIO OUTPUT which is so that it is no longer visible on the oscilloscope.
What is the selectivity of the receiver?
selectivity = 30 dB at 30 kHz from the tuned frequency of the receiver
참고 자료
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