STL-1506T/R Studio Transmitter Link Transmitter and Receiver

STL-1506 Series FM Stereo Studio-Transmitter Link System

1. System Overview

The STL-1506 Series is a complete FM Stereo Studio-Transmitter Link (STL) solution, comprising the STL-1506T Transmitter and the STL-1506R Receiver. Designed for professional broadcast applications, the system operates in the 220–280 MHz band to deliver high-fidelity stereo audio over long distances from a broadcast studio to a remote transmitter site.

2. System Features

• High-Fidelity Audio Transport: Utilizes advanced DSP technology in both units for audio processing and coding/decoding. Supports both analog and digital (AES/EBU) audio interfaces for end-to-end signal integrity.
• Flexible Configuration & Control: The transmitter offers adjustable RF output power and integrated audio processing (Compressor/Limiter). The receiver features LCD, three channel presets, and a front-panel monitor jack for intuitive operation.
• Professional-Grade RF Performance: Excellent frequency stability, sensitivity, and selectivity ensure a reliable and robust wireless link resistant to interference.
• Advanced Integration & Control: The receiver's RS-232 interface allows for remote control functions, such as power switching of compatible high-power transmitters, enabling automated broadcast systems.

3. Specifications
STL-1506T FM Stereo STL Transmitter

• Frequency Range: 220 – 280 MHz
• Output Power: 0 – 30 W (0.1W step resolution)
• Modulation: Direct VCO FM (Stereo)
• Audio Inputs:
  • Analog: XLR Female (Stereo, Balanced), 600 Ω
  • Digital: AES/EBU (Coaxial), 16/24/32-bit, up to 192 kHz
• Input Level: -15 to +15 dB (adjustable)
• Audio Performance:
  • S/N Ratio: > 80 dB RMS (75 kHz deviation)
  • THD: < 0.02%
  • Freq. Response: < ±0.05 dB (30 Hz – 15 kHz)
  • Stereo Separation: 55 dB (typical)
• RF Performance:
  • Spurious Emission: < -90 dBc
  • Harmonic Suppression: < -60 dBc
• Connector: N-type, 50 Ω
• Power Supply: 100–250 VAC ±15%
• Dimensions: 483 × 44 × 220 mm (1U, 19″ Rack)
• Weight: 2 kg

STL-1506R FM Stereo STL Receiver

• Frequency Range: 220 – 280 MHz
• Sensitivity: -110 dBm (typical, 26 dB SINAD)
• Selectivity: ±160 kHz (-3 dB) / ±500 kHz (-62 dB)
• Image Rejection: > 65 dB
• Audio Outputs:
  • Analog: XLR-Male & RCA, 600 Ω (balanced)
  • Digital: AES/EBU (Coaxial & Optical)
  • Monitor: 3.5 mm jack, > 2×0.2W (120 Ω)
• Audio Performance:
  • S/N Ratio: > 72 dB
  • THD: < 0.1%
  • Freq. Response: ±0.05 dB (20 Hz – 15 kHz)
  • Stereo Separation: > 55 dB (typical)
• De-emphasis: 50µs, 75µs, Flat
• RF Connector: N-type Female, 50 Ω
• Control Interface: RS-232
• Power Supply: 110V / 220V AC
• Dimensions: 483 × 44 × 32 mm

4. Typical Applications

• High-quality audio transport from a main studio to a mountaintop transmitter site.
• Program distribution and signal relaying for regional broadcast networks.
• Remote signal backhaul for large event or temporary broadcast setups.
• Integration with high-power transmitters (e.g., WarnerRF FMT series) to form a complete, remotely controllable transmission system.