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RF Transmit and Receive Link


Objective:

The purpose of this experiment is to have students apply knowledge about certain microwave components and RF test equipment by constructing and testing a microwave radio frequency transmitter and receiver system. The student will gain experience in the overall system calculations, RF link budget, RF test setup, and measured verification of the overall RT system.


Parts and Equipment:
1. Hewlett Packard IFR A7550 Spectrum Analyzer or Equivalent
2. Voltage Controlled Oscillators (VCO)
3. Low Noise Amplifier (LNA)
4. Microwave Amplifier (IF Amp)
5. Attenuators
6. Bandpass Filter
7. Mixer


Procedure:

1. System Calculations

a) For the system block diagram shown in Figure 1, calculate the output power from each block. Assume the mixer RF input is approximately -10dBm and the local oscillator (LO) input is approximately +8dBm.

b) For the receiver portion of the RF circuit, calculate the Overall Gain, Dynamic Range, and Overall Noise Figure.

2. Construct the microwave circuit in Figure 1. Students should choose RF components based on their calculated results. That is, the chosen parts will be representative to the calculated results and be within the specified values calculated. Once the parts are defined the student will construct the RF circuit and perform the following:

a) Measure the frequency and power level at the output of each block. Record the above data and compare the measured results with the calculated values.

b) Measure the magnitude of the image frequency, and the magnitude and frequency of spurs on the output of the mixer.


Engineering key words: Radio Frequency, RF, freq, transceiver, transmitter, receiver, antenna, mixer, non-linear device, intermediate frequency, band pass filter, high pass, low pass, input signal, low noise amplifier, BPF, IF Amp, LNA, LO, local oscillator, signal attenuation, attenuator, gain, dB, decibel, mixed signals, link budget, noise and noise figure, NF, dynamic range, microwave, RF system, components, specifications, manufactures, HP, loss.


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