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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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