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Testing

Personal FM transmitter Release Time:2022-04-14

A personal FM transmitter is a low-power FM radio transmitter that broadcasts signals from portable audio devices (such as MP3 players) to a standard FM radio. Some of these transmitters are plugged into the headset jack of the device, and some use wireless Bluetooth technology (such as a Bluetooth FM transmitter), and then broadcast the signal through the FM broadcast band frequency so that any nearby radio can receive it. This allows portable audio devices to take advantage of the louder or better sound quality of a home audio system or car stereo system without the need for a wired connection. They are usually used in automobiles, but they may also be used in fixed locations.



Due to national regulations, these transmitters have low power and shorter operating distances, depending on the quality of the receiver, obstacles and altitude. 

 

Test requirements of national regulations 

 

Country or region

maximum

Frequency Range

standard test

Certification

Require

power

Require

other

European Union and United Kingdom

87.6-107.9MHz

ETSI EN 301 357

CE-RED

和UKCA

50 nW ERP

After removing the audio, stop the transmission within 1 minute or   reduce the transmission power to 3 nW

China

87-108MHz

Catalog and technical requirements   of micro-power short-range radio transmitting equipment

without

45 nW ERP

without

U.S. and Canada

88.1-107.9MHz

FCC part   15.239

FCC ID

250µV/m

@ 3m

Within 200kHz   bandwidth

Japan

76.1-89.9MHz

Article 6 of the Enforcement   Rules of the Radio Law

Exemption test report or ELP   certification

500µV/m

@ 3m

without

South Korea

87.6-107.9MHz

Ministry of Science   and ICT Notice No. 2019-105

KC

500µV/m

@ 3m

without

Australia

88.1-107.9MHz

AS/NZS 4268

RCM

10 µW

ERP

Bandwidth within 180kHz

 

Remarks: Most other regions refer to European standard requirements, and individual regions may have special requirements.

 

Test site and equipment requirements

FM transmitters are generally tested in a 3-meter semi-anechoic chamber. The audio analyzer is used to provide audio signals to the product, and the measuring receiver is used to measure the main wave power, frequency deviation, bandwidth, emission spurious, and emission time of the product. project.



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