FM transmitter LTC TR225 by LTC LXTR225 — car/mobile audio transmitter

The LTC TR225 FM transmitter is a compact car and mobile audio adapter that broadcasts audio from smartphones, tablets or portable players to FM radio receivers. It connects to a source device and transmits audio over selectable FM frequencies, allowing playback and hands-free phone calls through a vehicle or home FM radio. The design emphasizes simple setup and compatibility with common mobile devices for in-car or portable listening.

Advantages

The LTC TR225 enables wireless transmission of music and voice to any FM radio without altering the radio hardware. Its plug-and-play operation and frequency selection make it practical for use in older vehicles or radios without Bluetooth or auxiliary inputs. The device supports hands-free use via the mobile device microphone and preserves audio continuity during driving or stationary listening.

Suitable for

• Older cars without Bluetooth or AUX inputs
• Home radios that receive FM broadcasts
• Smartphones and tablets for music streaming and hands-free calls
• Portable audio players that lack direct FM transmission

Key specifications

• Transmission type: FM radio broadcast
• Compatibility: works with smartphones, tablets and portable audio players via audio output
• Power source: vehicle power adapter or internal battery depending on variant
• Frequency selection: multiple FM channels selectable to avoid interference
• Functions: audio playback transmission and hands-free call relay

How to use

Plug the LTC TR225 into the appropriate power socket or connect according to the device’s power requirements, then pair or connect your mobile device using the transmitter’s audio input method. Tune the FM radio to an unused frequency and set the transmitter to the same frequency. Start audio playback or accept calls on the connected device — sound will be transmitted to the FM receiver. Adjust the radio and transmitter frequency if interference occurs.

Usage recommendations

Select an FM frequency with minimal local radio traffic to reduce static and noise. Position the transmitter and radio for best reception, and keep software and firmware on your mobile device up to date for stable hands-free operation. When not in use, disconnect power to avoid battery drain.