AM/FM Automotive Antenna

Overview

AM/FM system plays an important role in the transmission, transmission and reception of broadcast signals, each of which has its own advantages and application scenarios. AM modulation, with its simple implementation and low cost advantages, is suitable for low cost and low bandwidth application scenarios. With its excellent anti-interference ability and high sound quality performance, FM modulation occupies a dominant position in high-quality audio transmission and complex communication systems with interference environments.

Key Features

Signal transmission, transmission mode

The signal is transmitted as if you were making a sound. The transmitting device is mainly composed of resistors and inductors, forming a resonant circuit to generate the desired carrier frequency. The transmitter transmits the modulated signal through the antenna into the air for the receiving device to receive. It’s like when you shout through a loudspeaker so that your distant friends can hear you.

Reception of signal

Once you get the signal, it’s like when you hear a friend Shouting and you need to understand what he means. First, the audio information in the high-frequency carrier signal needs to be extracted by demodulator. The process of demodulation involves filtering to remove the high-frequency components, leaving only the low-frequency audio signal. The demodulation methods of AM signal and FM signal are different. AM signal is demodulated by envelope detector, FM signal is demodulated by frequency discriminator.

Specification

Frequency	AM: 535-1710 KHz
Frequency	FM: 87.5-108 MHz
DC Voltage	9-16 V
DC Current	60mA Max
Gain	FM 5 +/-3dB, AM -6dB+/-3dB
Mechanical Specification
Weight	103g
Size	Φ45.3mm, heigh: 14.7mm
Cable Type	1.5C2V
Cable Length	3 meters
Power Supply Wire	Φ2.2, 22AWG, length: 3.26 meters
Ground Wire	tinned copper wire
Connector	Motorola
Mounting Method	Adhesive
Housing color	Black
Film Length	5.3 meters
Enviromental Specification
Working Tempreture	-30~+80°C
Storage Tempreture	-30~+85°C
Humidity	95%-100%RH

Applications

AM/FM refers to Amplitude Modulation (Amplitude Modulation) and Frequency modulation (Frequency Modulation) two modes of radio broadcast signal modulation. These two modulation modes play a key role in the transmission of broadcast signals, and they each have different characteristics and application scenarios.