Professional AM-FM DAB Amplified Splitter with FAKRA Adaptors

ATTB 4721 Professional DAB+ & AM/FM Active Signal Splitter Amplifier

The ATTB 4721.01 amplifier splits and boosts the broadcast input signal into AM/FM and DAB/DAB+. These two signals are amplified independently of each other to ensure optimal performance. Developed and manufactured in Germany by Antennentechnik Bad Blankenburg, this high-grade solution is engineered for internal vehicle or indoor use. With its own research, development, and production, ATTB has stood for the highest quality and reliability "Made in Germany" since 1919.

Why You Need This Splitter Amplifier:

• Upgrade to DAB+ Without Changing Your Aerial: Generates an additional DAB/DAB+ signal directly from your vehicle's existing AM/FM antenna, allowing you to install a DAB head unit without fitting an unsightly windscreen glass-mount antenna.
• Independent Boost: Amplifies both analogue and digital broadcast signals separately, preventing cross-frequency noise and boosting reception in low-signal areas.
• Clean Installation: Designed for compact internal mounting behind the dashboard using the supplied adhesive pad.

Professional Installation Recommended:

This unit requires connection to a switched +12V DC power source (+9V to 16V) to power the internal amplifiers. To ensure correct wiring, proper signal grounding, and to prevent accidental short circuits or battery drain, professional installation by a qualified auto electrician or car audio specialist is recommended.

Key Features & Capabilities:

• Signal Splitting & Amplification: Radio amplifier splits the broadcast input signal into several frequency ranges or communication services and amplifies them independently.
• Output 1 (AM/FM): Dedicated first output signal covers AM/FM frequency ranges (150 - 1710 kHz; 76 - 180 MHz).
• Output 2 (DAB/DAB+): Dedicated second output signal covers digital broadcast DAB/DAB+ band (174 - 240 MHz).
• DRM Compatibility: DRM-compatible due to extended bandwidth in the high-frequency (HF) range.
• Mounting: Mounts easily using the included double-sided adhesive pad.

Technical Specifications:

• Frequency Ranges & Gain:
  • AM (0.15 - 1.71 MHz): 10 dB Gain (Noise: N/A)
  • FM (76 - 180 MHz): 13 dB Gain (Noise: ≤3.5 dB)
  • DAB/DAB+ (174 - 240 MHz): 15 dB Gain (Noise: ≤2.0 dB)
• Impedance: 50 Ohms
• Power Supply & Current Draw:
  • AM/FM Circuit: +9V to 16V DC, 70 mA
  • DAB/DAB+ Circuit: +9V to 16V DC, 20 mA
• Base Connectors: FAKRA male (m) Z-coded
• Included Adaptor Cables (Scope of Delivery):
  • FAKRA socket to DIN plug (150 Ohm DIN plug for AM/FM output)
  • FAKRA socket to DIN socket
  • FAKRA socket to SMB socket (SMB female for DAB/DAB+ output)
• Dimensions: 79 mm (Length) x 50 mm (Width) x 11 mm (Height) (approx., excluding connectors and cables)
• Weight: 0.066 kg

Important Technical Disclaimer: This passive-to-active signal splitter is designed for use with standard unamplified (passive) rod or whip aerials. It is not suitable for factory aerial setups that feature integrated phantom-powered amplifiers, active glass/windscreen antennas, or amplified aerial bases unless the original factory amplifier circuit is bypassed. Please verify your vehicle's aerial system prior to purchase.