WHAT IS AN ANTENNA??
• Radiating/Receiving element
• Reciprocity - Behave similarly while radiating or receiving
• Isotropic antenna - radiates uniformly in all directions
• In practice, no antenna is isotropic
TYPES OF ANTENNA
• Guyed mast
• ‘T’,k,l and ‘L’ antennae
• Shunt fed
• Top fed
IMPORTANT PARTS
• Base insulator
• cricket ball
• Guy wires
• Guy insulators
• Guy chokes
• Aviation obstruction lighting
• Lighting transformer
• Static leak choke
• Earth radials
RF Cables
• RF cables are generally pressurised and has a characteristic impedance of 50 ohms
• They are available in different sizes and lengths
• They are to be supported and secured for preventing damages
• Cable ends are to be sealed properly to prevent intrusion of moisture
