DSP PLL 87-108Mhz Stereo FM Transmitter Module Digital LCD Display Wireless Microphone Board Multi-function Frequency Modulation

The DSP PLL 87-108MHz Stereo FM Transmitter Module is a professional-grade frequency modulation board featuring digital phase-locked loop technology for stable, high-quality FM broadcast transmission. Radio engineers, community broadcasters, and audio professionals utilize this module to establish wireless microphone systems and localized FM distribution networks with stereo audio capability. This device solves the critical challenge of transmitting high-fidelity stereo audio over FM frequencies while maintaining precise frequency stability through DSP-based PLL control, eliminating the frequency drift issues common in analog transmitter designs.

Product Overview

This DSP PLL FM Transmitter Module operates on the standard FM broadcast band of 87-108MHz, utilizing a digital phase-locked loop architecture that ensures frequency accuracy within tight tolerances. The module employs advanced DSP (Digital Signal Processing) algorithms to generate clean, distortion-free stereo FM signals with excellent frequency response. The integrated LCD display provides real-time frequency readout and operational status monitoring, allowing operators to verify transmission parameters instantly. The stereo encoder built into the module processes left and right audio channels independently, combining them with a 19kHz pilot tone to generate a proper stereo multiplex signal that standard FM receivers can decode with full stereo separation.

The wireless microphone integration capability makes this module ideal for portable broadcasting applications where hardwired audio connections are impractical. The multi-function design includes adjustable modulation index, frequency stability controls, and output power regulation, providing professional-level broadcast flexibility in a compact form factor. The PLL frequency locking mechanism continuously monitors and corrects any frequency drift, maintaining transmission accuracy even under varying temperature and load conditions. This ensures reliable operation in field deployment scenarios where environmental stability cannot be guaranteed.

Key Specifications

Specification	Details
Product Type	DSP PLL Stereo FM Transmitter Module with LCD Display
Frequency Range	87-108 MHz (Standard FM Broadcast Band)
Frequency Stability	±500 ppm with DSP PLL Control
Audio Mode	Stereo with 19kHz Pilot Tone
Modulation Type	Frequency Modulation (FM)
Display	Digital LCD Display for Frequency and Status
Microphone Input	Wireless Microphone Compatible with 3.5mm Audio Jack
Output Power	Adjustable 0-2W RF Output
Audio Input Impedance	10kΩ (Line Level)
Frequency Adjustment	Digital Tuning via Control Interface
Brand	Generic Professional Grade
Origin	Original/Authentic
Warranty	7 days on manufacturing defects
Shipping	1-5 days from Bengaluru
Delivery	7-8 days across India
Support	24/7 via Email and WhatsApp

Key Features

• DSP-Based Phase-Locked Loop ensures frequency accuracy within ±500 ppm, eliminating frequency drift and maintaining stable transmission across extended operating periods
• Stereo FM Encoding with 19kHz Pilot Tone generates proper stereo multiplex signals compatible with all standard FM receivers for full stereo separation
• Digital LCD Display provides real-time frequency readout and operational status, enabling instant verification of transmission parameters without external test equipment
• Wireless Microphone Input Support allows direct connection of wireless microphone systems with automatic audio level detection and adaptive gain control
• Adjustable RF Output Power from 0-2W enables range control from short-distance indoor broadcasting to extended outdoor coverage depending on antenna configuration
• Multi-Function Frequency Modulation Control allows fine-tuning of modulation index, deviation, and audio processing parameters for optimal signal quality

Applications and Use Cases

• Community Radio Broadcasting: Establish localized FM broadcast stations for educational institutions, hospitals, and residential communities with stereo audio quality and wireless microphone flexibility
• Event Audio Distribution: Transmit live event audio including speeches, music, and announcements to portable FM receivers across venue areas without complex wiring infrastructure
• Wireless Microphone Systems: Create wireless microphone networks for conferences, presentations, and performances by combining this transmitter with compatible wireless microphone receivers
• Audio Equipment Testing and Calibration: Engineers use this module to verify FM receiver performance, test audio processing chains, and calibrate stereo separation in audio equipment
• Educational Laboratory Demonstrations: Electronics and telecommunications students utilize this module to understand FM modulation principles, DSP implementation, and broadcast signal generation
• Portable Studio Broadcasting: Mobile broadcasting setups leverage the compact design and LCD display for remote location audio transmission with professional stereo quality

How to Use

Begin by connecting the power supply to the module and allowing 30 seconds for the DSP PLL circuit to stabilize and lock onto the selected frequency. Use the digital tuning interface to select your desired transmission frequency within the 87-108MHz band, which will display on the LCD screen. Connect your audio source (wireless microphone receiver, audio mixer, or line-level audio device) to the 3.5mm audio input jack, ensuring the audio level is set to approximately -6dB to -3dB on the source device to prevent over-modulation and distortion. The module will automatically process the stereo audio channels and generate the proper FM multiplex signal with the 19kHz pilot tone.

Adjust the RF output power using the power control potentiometer based on your antenna type and desired coverage area, starting at minimum power and increasing gradually while monitoring the LCD display for frequency stability indicators. Connect your antenna to the RF output connector, using a quarter-wave or half-wave antenna appropriate for the FM band for optimal radiation pattern and range. Monitor the frequency display continuously to ensure the PLL remains locked; if frequency drift occurs, verify the power supply voltage is stable and the antenna is properly connected. For wireless microphone integration, ensure your wireless microphone receiver is tuned to the same frequency as the transmitter module, and adjust the audio input level to prevent clipping while maintaining adequate modulation depth for clear reception on standard FM receivers.

Frequently Asked Questions

What is the maximum transmission range of this FM transmitter module?

The transmission range depends on several factors including RF output power setting, antenna type, antenna height, terrain characteristics, and receiver sensitivity. At maximum 2W output with a proper half-wave antenna at elevated position, typical range is 500-1500 meters in open terrain. Indoor transmission range reduces to 50-200 meters depending on wall materials and construction. Using a directional antenna or elevated mounting can extend range significantly. For specific range requirements, consult our technical team via WhatsApp with details of your installation environment.

Can this module transmit true stereo audio, and how does the stereo encoding work?

Yes, this module generates true stereo FM signals using standard stereo multiplex encoding. The module combines the left and right audio channels with a 19kHz pilot tone to create the stereo composite signal. Standard FM receivers automatically detect this pilot tone and use it to activate stereo decoding, separating the composite signal back into left and right channels. The stereo separation is typically 40-50dB, meaning minimal crosstalk between channels. This is identical to commercial FM broadcast stereo encoding, ensuring compatibility with all consumer FM receivers.

How does the DSP PLL frequency locking mechanism prevent frequency drift?

The DSP PLL (Phase-Locked Loop) continuously compares the actual transmitted frequency against a stable reference oscillator and automatically adjusts the transmitter frequency to maintain lock. Any deviation from the selected frequency is detected and corrected within milliseconds through digital feedback control. This maintains frequency accuracy within ±500 ppm even as temperature changes, component aging, or load variations occur. Unlike analog transmitters that drift significantly with temperature, the DSP PLL ensures stable frequency throughout the operating session, critical for reliable receiver tuning and compliance with frequency regulations.

What audio input impedance and level does this module require?

The module accepts line-level audio signals with 10kΩ input impedance, typically requiring audio levels between -20dBu and -10dBu for optimal modulation without distortion. Most audio mixers, audio receivers, and wireless microphone systems output at this level. If your audio source outputs lower levels (like microphone level at -40dBu), you will need an external preamplifier or mixer to bring the signal to line level. The module includes automatic gain control that adapts to input levels, but setting source levels correctly ensures maximum signal quality and prevents over-modulation distortion.

Is this module legal to operate in India, and what frequency regulations apply?

FM transmission regulations in India are governed by the Ministry of Information and Broadcasting. Community radio stations require specific licensing and must operate on designated frequencies. This module is designed for educational, laboratory, and licensed broadcasting purposes. Before operating this transmitter, you must obtain appropriate licenses from the Indian Broadcasting Authority if transmitting for public reception. Unlicensed transmission may violate Indian Wireless Telegraphy Act. We recommend consulting local regulatory authorities regarding your specific use case. Our technical team can provide guidance on frequency selection for licensed operations.

When will I receive my order?

Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India. Express shipping options may be available for urgent requirements. You will receive tracking information via email and WhatsApp once your order ships.

What is your return and warranty policy?

We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. This warranty covers defects in components, soldering, or circuit design. Not applicable for user damage, misuse, improper power supply connections, or damage from antenna-related issues. All returns require photographic documentation of the defect and must be approved by our technical team before shipment.

Are bulk discounts available?

Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote. We also offer educational institution discounts for laboratory and research applications. Special pricing available for community radio organizations and licensed broadcasters.

Why Buy from The Engineer Store

• Genuine Products: Sourced directly from authorized distributors with authentication certificates for all electronic modules
• Expert Team: Our technical team validates every product before listing and provides specialized support for RF and broadcast applications
• Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse with real-time tracking
• Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmed

Buy DSP PLL 87-108Mhz Stereo FM Transmitter Module Digital LCD Display Wireless Microphone Board Multi-function Frequency Modulation Online in India

Purchase the DSP PLL 87-108Mhz Stereo FM Transmitter Module Digital LCD Display Wireless Microphone Board Multi-function Frequency Modulation online at The Engineer Store, India's trusted source for genuine electronics. We deliver across Bengaluru, Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata, Ahmedabad, Jaipur, and Surat.

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