Sennheiser AB 3700 Antenna Booster (470-866 MHz, 15 dB Gain)

Active inline antenna booster for compensating cable loss on Sennheiser 2000-6000 Series receiver systems

The Sennheiser AB 3700 is an active antenna booster providing 15 dB of gain across the 470-866 MHz UHF range. Designed for Sennheiser EM 2000, EM 2050, EM 3731, EM 3732, and EM 6000 receivers, the AB 3700 is placed inline between the antenna and the receiver to compensate for signal loss in long coaxial cable runs, ensuring that the RF signal arriving at the receiver is strong enough for reliable wireless operation.

Every meter of coaxial cable introduces signal loss. In large venues, theaters, and broadcast facilities where antennas may be positioned 30, 50, or even 100 meters from the receiver rack, this cumulative cable loss can reduce the wireless system's effective range and reliability. The AB 3700 restores the lost signal energy, maintaining the system's designed operating range even over extended cable runs.

Key Features

• 15 dB active gain for compensating coaxial cable signal loss
• Wideband operation: 470-866 MHz
• BNC connectors for inline installation between antenna and receiver
• 3/8-inch mounting thread for stand or hardware mounting
• DC-powered via coaxial cable from compatible receivers
• Compatible with EM 2000, 2050, 3731, 3732, and 6000 receivers

Professional Applications

• Long coaxial cable runs in large venues and arenas
• Remote antenna placement in theaters and broadcast facilities
• Touring productions with variable antenna-to-receiver distances
• Fixed installations including churches and worship facilities where receiver racks are distant from antenna positions

Frequently Asked Questions

How does the AB 3700 differ from the A 3700 antenna?

The A 3700 is an active antenna with built-in amplification and adjustable gain (5/10/15 dB). The AB 3700 is an inline booster that adds 15 dB of gain to any existing antenna. Use the AB 3700 when you want to keep your current antenna and just add signal boost to the cable run.

Can I use the AB 3700 with Evolution Wireless receivers?

The AB 3700 requires DC bias power from the receiver. It is designed for 2000, 3000, and 6000 Series receivers that provide DC bias. Evolution Wireless receivers do not supply DC bias and cannot power this booster.

Related Equipment and Workflow Compatibility

The AB 3700 works with Sennheiser EM 2000, EM 2050, EM 3731, EM 3732, and EM 6000 receivers. It is typically placed at the antenna end of the cable run, near the antenna itself, to boost the signal before cable losses reduce it.

Why Professionals Use This Type of Product

• 15 dB gain compensates for signal loss in long coaxial cable runs
• Maintains wireless system range and reliability in large venues
• DC-powered via the receiver cable eliminates separate power requirements
• Inline design adds boost to any existing antenna without replacement

Additional Compatibility Information

The Sennheiser AB 3700 is an active inline antenna booster with 15 dB gain covering 470-866 MHz, powered via DC bias from Sennheiser 2000, 3000, and 6000 Series rackmount receivers.