ANTENNA DESIGN
There are two types of antenna for FM TRANSMITTE
1. Ground pole Antenna
2. Half-Wave Dipole Antenna
A ready made GP Antenna.
1. Ground pole Antenna(GP)
This Antenna is most widely used all over the world. For example, when you see a police car it has a transmitter with Ground Pole Antenna The body of car serves as ground). It accepts load from 50 ohm source and has larger power output than Half-Wave Dipole Antenna.
Frequency | Radiator - B | Radials - A |
108MHZ | 660 | 693 |
104MHz | 684 | 720 |
100MHz | 713 | 749 |
90MHz | 792 | 819 |
2. Half-Wave Dipole Antenna Or Open Dipole Antenna
It accepts load from 75 ohm source and has much smaller power output than Ground Pole Antenna. Use this antenna only when you don't have GP Antenna.
Construction: Two aluminum rods ,each of length "L" in meters are joined together through an insulator as shown in fig. From center, 75 ohm cable is feeded just like ordinary TV antenna.
I'll discuss the design, calculation of length, wire to be used and set-up details of FM TRANSMITTER Antenna very soon in this blog. so stay tuned.
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Apart from the categorized facts about kinds of antennas, I would like to mention that both Ground Pole and Dipole also comes in various variants, according to their material-built and use-area.
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Are the values for the Ground pole Antenna(GP) in inches or in millimeters?
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