1. Lab 3
Antennas

2. Antenna Gain What factors determine antenna gain? Effective Area
Wavelength

3. Propagation modes
Ground Wave
Sky-Wave Progagation
Line Of Sight

4. For parabolic reflective antenna with diameter 2 meter ,operating at 12 GHz ,what is the effective area and the antenna gain ?

5. State which mode applied to each system
Am Radio –
Ground wave Propagation
International Broadcast Such as BBC-
Sky Wave Propagation
Satellite Communication –
Line Of Sight

6. Name and briefly four types of noise ?

7. How to overcome the attenuation ?
Use Amplifiers and Repeaters

8. Show that doubling the transmission frequency or doubling the distance between transmitting antenna and receive antenna the power received by 6 dB?

9. Determine the height of an antenna for TV station that must be able to reach customers up to 80 km away

10. What the thermal noise of a channel with a bandwidth of 10 KHz carrying 1000 Watt of power operating at 50 C ? Compare the noise level to the operating power