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Broadcast & Media / ATSC

Broadcast & Media / ATSC

Broadcasting & Media / ATSC

ATSC Technology and Filter Requirements

The North American broadcasting standard ATSC, particularly in its latest evolution ATSC 3.0 (NextGen TV), defines digital TV transmission over terrestrial antennas in the USA, Canada, and South Korea. Technologically, ATSC primarily operates in the VHF band (54-216 MHz) and the UHF band (470-608 MHz). The primary challenge results from massive spectrum reallocation: following the Incentive Auction Repack in the US, the range above 608 MHz (formerly UHF channels 37-51) was entirely cleared for mobile communications. Without high-selectivity filtering, high-power 5G services in the n71 band (600 MHz) can saturate high-sensitivity ATSC receiver front-ends. Since ATSC 3.0 is based on OFDM modulation, any out-of-band interference leads to massive losses in signal integrity and range. Wainwright Instruments provides specialized high-performance filters for ATSC infrastructure, precisely tailored to the extreme requirements of spectral separation in the 600 MHz range. Since transmission systems are often operated in physical proximity to 5G gNodeBs, extraordinary skirt steepness is required to protect high-sensitivity input stages from LTE/5G out-of-band emissions. Our filter solutions ensure maximum phase linearity and minimal insertion loss, which is critical for error-free transmission of 4K/UHD content and maintaining Quality of Service (QoS). We manufacture these components for broadcasters and network operators demanding uncompromising signal purity in an increasingly congested spectrum.

Typical Deployment Scenarios

In professional transmission and reception technology for the North American market, ATSC filters from Wainwright secure the stability of transmission chains against terrestrial interference.

  • ATSC 3.0 Transmission Infrastructure: At terrestrial towers, our filters eliminate unwanted sideband emissions to comply with strict masks for adjacent 5G n71 mobile networks (617-698 MHz).
  • Low Power TV (LPTV) Stations: To secure signal quality in local networks, our filters protect transmitter outputs from feedback from neighboring high-power base stations.
  • Master Control Rooms (MCR): In network transmission centers, our filters ensure the purity of control signals amidst a high density of terrestrial broadband backhauls.
  • Mobile ATSC Broadcast Vans: During outdoor broadcasts, our compact filters protect terminals from saturation by local 600 MHz mobile infrastructure in urban areas.
  • Digital Headends: For signal processing for cable networks, our components isolate ATSC signals from radiation from LTE Band 12/13/14 (700 MHz range).
  • Automotive ATSC Integration: For mobile TV receivers in vehicles, our filters suppress signals from on-board 4G/5G modules to enable stable reception even while driving.
  • Public Safety Messaging: As ATSC 3.0 is used for disaster warnings, our filters secure receive paths against artificial noise floors and atmospheric noise.
  • Scientific Signal Monitoring: In research facilities, our filters enable the investigation of signal propagation in the UHF range through massive suppression of terrestrial broadband services.

Suitable Filter Categories for Broadcasting & Media / ATSC

High requirements for adjacent channel suppression and bandwidth in the ATSC standard demand filter solutions offering micrometer-level mechanical precision.

Band Pass Filters

Our ATSC Band Pass filters enable precise selection of UHF channels in the 470 MHz to 608 MHz range. In professional transmission systems and ATSC infrastructure applications, these filters effectively eliminate out-of-band emissions that immediately border 5G services in the n71 band. High quality factors maximize the Signal-to-Noise Ratio (SNR) , essential for maintaining high modulation rates in ATSC 3.0 networks. The robust housing design guarantees long-term stability of the filter characteristics even under extreme climatic conditions at exposed antenna sites. Manufacturers of ATSC infrastructure components benefit from the high power handling and precision of our filters.

Manually Tunable Band Pass Filters

For hardware development and signal optimization, we provide manually tunable Band Pass filters flexibly covering the 50 MHz to 1000 MHz range. Via high-precision mechanical tuning elements, the passband can be adjusted exactly to specific ATSC channels for investigating edge interference from new mobile services. This flexibility allows engineers to validate the robustness of tuners and amplifiers against targeted interference in the lab without constantly procuring new hardware. Mechanical precision ensures permanent reproducibility of measurement results during complex certification series.

Digitally Tunable Band Pass Filters

Electronically controllable filters support modern Software Defined Radio (SDR) monitoring systems that must react agilely to changing frequency plans and new regional allocations. Via digital interfaces, filter parameters can be adjusted in real-time, which is advantageous for automated test sequences checking channel selectivity in the UHF range. Our digitally tunable filters combine precise digital control with the necessary RF quality and are optimized for use in test environments and development systems. They enable rapid system reconfiguration without physical hardware replacement at hard-to-reach antenna sites.

Band Reject Filters / Notch Filters

Our ATSC notch filters serve to eliminate specific high-energy interfering signals located immediately adjacent to the utilized TV spectrum. Particularly critical is the suppression of LTE carriers in the 700 MHz range, which block high-sensitivity domestic amplifiers and can degrade the Bit Error Rate (BER). Narrowband interference from industrial applications is also effectively masked, while the remaining passband for digital video data remains virtually loss-free. By using these notch filters, the robustness of the ATSC infrastructure against narrowband interferers is massively increased and availability at sites with high cellular density and small cells is enhanced.

Manually Tunable Band Reject Filters / Notch Filters

Frequency-tunable notch filters provide a highly flexible solution for interference suppression directly at transmitter centers and headends. Through precise manual adjustment of the rejection frequency, interfering signals from poorly tuned transmitters in the 400 MHz to 900 MHz range can be specifically masked to maintain signal quality. This ensures that system operators can respond immediately to new interference sources in the field without time-consuming hardware swaps. The robust construction is optimized for heavy-duty outdoor use and offers stable rejection performance across wide temperature ranges.

Digitally Tunable Band Reject Filters / Notch Filters

In intelligent broadcast networks, digitally tunable notch filters enable an automated response to dynamic interference scenarios through adaptive filtering. Controlled by monitoring algorithms, these filters detect interfering signals in real-time to maintain Quality of Service (QoS) for critical ATSC data streams. Their integration into automation concepts for radio optimization allows for autonomous radio optimization of entire antenna parks without on-site technicians. Thanks to remote controllability, operators can adjust filter characteristics centrally, significantly increasing resilience against new, agile interference sources in the UHF range.

Monoplexer / Diplexer / Duplexer / Triplexer

Combining different signal sources (e.g., VHF and UHF) requires high-performance multiplexers with high isolation to prevent feedback between paths. Our triplexers enable the combination of VHF-Low, VHF-High, and UHF signals onto a common feed with minimal mutual interference of frequency ranges. Wainwright Instruments manufactures these components with a focus on minimal group delay distortion to avoid compromising digital signal phase integrity. Precise mechanical tuning also ensures high power handling with a compact design for 19-inch rack mounting. Our multiplexers are optimized for use in professional ATSC infrastructure and transmission systems.

Absorptive Filters

Absorptive filters preserve signal purity in the transmission infrastructure of large-scale transmitters before radiation to the end customer. Rather than conducting unwanted harmonics or reflections back to the power amplifier, these filters safely convert them into heat, preventing signal distortion. This is particularly important for complying with strict FCC emission masks in the UHF range at extremely high transmit powers. Our absorptive filters consistently minimize thermal feedback, thereby increasing the lifespan of expensive amplifier stages by reducing load and ensuring the reliability of transmission operations.