Sennheiser SK 250-UHF-B Sennheiser

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The Sennheiser SK 250-UHF-B is a high-powered 250 mW UHF bodypack transmitter designed for demanding broadcast, ENG, sports, surveillance, touring, and live performance applications. Featuring a rugged full-metal housing, LEMO connectors, 16 switchable carrier frequencies, 24 MHz bandwidth, and Sennheiser’s HiDyn plus™ noise reduction system, it delivers reliable long-range wireless audio transmission in challenging RF environments.

The Sennheiser SK 250-UHF-B is a professional high-performance bodypack transmitter designed for applications where maximum range, reliability, and mechanical durability are essential. Delivering up to 250 mW RF output power, it is ideal for electronic news gathering (ENG), sports broadcasting, live performances, touring productions, surveillance applications, and venues with demanding RF conditions.

Built with a robust full-metal housing, the SK 250 is engineered to withstand intensive professional use while maintaining dependable wireless performance. Its specially designed LEMO connectors provide secure microphone and antenna connections while helping reduce interference. The uniquely keyed pin configuration prevents accidental connection errors, improving operational safety in professional environments.

The transmitter offers 16 switchable carrier frequencies within a 24 MHz switching bandwidth and uses PLL-controlled frequency management for stable transmission. Combined with Sennheiser’s HiDyn plus™ noise reduction technology, it delivers excellent audio clarity with a signal-to-noise ratio greater than 117 dB(A).

The SK 250 supports a wide range of Sennheiser microphone accessories and audio input adapter cables, including professional lavalier microphones such as the MKE 2 series. Its adjustable peak deviation, flexible frequency selection, and high RF output make it suitable for productions requiring extended transmission distance and maximum reliability.

Battery management information can be transmitted to compatible receivers, allowing operators to monitor transmitter status remotely. The quick-change battery system supports both B 250-1 and BA 250-1 battery packs for convenient field operation.

Key Features

• Professional 250 mW UHF bodypack transmitter
• Designed for broadcast, ENG, sports, touring, and live applications
• Rugged full-metal housing construction
• High RF output power for extended transmission range
• 16 switchable carrier frequencies
• 24 MHz switching bandwidth
• PLL-controlled frequency stability
• LEMO microphone and antenna connectors
• HiDyn plus™ noise reduction system
• Battery status transmission to compatible receivers
• Quick battery or rechargeable pack replacement
• Compatible with Sennheiser lavalier microphones and accessories
• Reliable performance in RF-congested environments

• 1 × Sennheiser SK 250-UHF-B High-Powered Bodypack Transmitter
• 1 × Channel Switcher
• 1 × Set of Color-Coded Identification Markers
• 1 × Antenna

RF System

• Brand: Sennheiser
• Model: SK 250-UHF-B
• Product Type: UHF Bodypack Transmitter
• Frequency Range: 540–698 MHz (Range B)
• RF Output Power: Maximum 250 mW (-1 dB)
• Transmission Frequencies: 16
• Switching Bandwidth: 24 MHz
• Modulation: Wideband FM
• Nominal Deviation: ±40 kHz
• Peak Deviation: ±56 kHz
• Peak Deviation Adjustment: 8 Steps

Audio Performance

• Noise Reduction System: HiDyn plus™
• AF Frequency Response: 45 Hz – 20 kHz
• Signal-to-Noise Ratio: >117 dB(A) RMS
• Input Sensitivity: 13 mV – 1.55 V

Connections

• Audio Connector: Special 3-pin audio socket
• RF Connector: Coaxial antenna socket

Power & Physical

• Battery Compatibility:
  • B 250-1 Battery Pack
  • BA 250-1 Rechargeable Battery Pack
• Operating Time:
  • B 250-1: More than 2.5 hours
  • BA 250-1: More than 4.5 hours
• Dimensions: 116 × 60 × 17 mm
• Weight: Approx. 230 g (including battery pack)