ssb

SSBSC AM Communications Equipment: Frequency counter 50 ohm RF dummy load Oscilloscope 10:1 scope probe 2 function generators AM/SSB transceiver, Realistic TRC-465 Caution: do not operate transmitter with full carrier or modulation for more than 2 minutes continuously, and keep duty cycle to 50% or less. Do not operate transmiiter without a 50 ohm load. 1. Construct the attenuator/combiner on p. 209 of the text. Connect it to the microphone connector of the transceiver in the same way as for the AM transmitter lab. 2. Apply a 1 kHz modulating signal at about 5 mV RMS to the microphone input and observe the transmitter output on the oscilloscope. Measure carrier suppression in dB below SSB output,. 3. Use the counter to measure output frequency as exactly as possible on both USB and LSB. Compare with theory. 4. Now apply a 2 kHz modulating signal. Note the change in output frequency on both sidebands and compare with theory. 5. Perform a two-tone test, using frequencies of 500 Hz and 2400 Hz at equal amplitude. Observe and sketch the oscilloscope pattern. Measure the peak envelope power output using the scope. 6. Set up communication between two transceivers. Work with another student. Experiment with: AM USB and LSB, using the same sideband for both transceivers. Adjust the clarifier controls for best results. Explain what the clarifiers do. USB on one transceiver and LSB on the other. 323\labs\lab7.93w