Whitepaper
Tower Top Amplifiers
700MHz – 800MHz
Dependable performance for mission critical applications
Filtronic’s TTA systems are fully compliant with the most stringent public safety RF specifications. The amplifiers have excellent system flatness across the passband and low system noise figure while retaining linearity and out-of-band rejection. This provides optimum inbound coverage and dependable performance in mission-critical applications. The Tower Top Amplifier (TTA) is a crucial component in the majority of network base stations. It is used to improve receiver performance. TTAs incorporate a low-noise amplifier installed at the top of the mast and a control/distribution unit installed at the base. The tower-top element incorporates a low-loss, bandpass filter to protect the receiver from out-of-band interference and a low-noise amplifier to boost the received signal.
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Designed for:
Critical Communications
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Datasheet
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Overview
Our Tower Top Amplifier (TTA) systems are engineered to enhance the performance of critical communication networks, particularly in 700 and 800 MHz bands. These systems improve base station receiver sensitivity by amplifying weak signals at the tower top, thereby reducing signal loss associated with feeder cables. This enhancement is crucial for public safety systems, such as P25 networks, where reliable communication is essential.
A notable advancement in this product line is the introduction of a 48-port TTA solution, expanding capacity to accommodate larger networks or agencies that have outgrown their existing systems. This expansion supports interoperability across jurisdictions, ensuring seamless communication during critical operations.
Why choose Filtronic’s Tower Top Amplifiers?
- Enhanced signal strength and coverage – TTAs amplify weak signals at the tower top, improving base station receiver sensitivity and extending coverage in public safety and critical communication networks.
- Optimised for P25 and emergency networks – Designed for 700/800 MHz bands, ensuring seamless interoperability across jurisdictions and reliable communication in mission-critical situations.
- Scalable and future-proof solutions – Supports up to 48 ports, making it ideal for expanding networks while maintaining low noise, high reliability, and robust performance in demanding environments.
Filtronic’s Tower Top Amplifiers provide superior signal quality, extended coverage, and scalable capacity, making them an essential solution for public safety, emergency response, and high-reliability networks. With proven field performance and seamless integration into existing systems, they ensure uninterrupted, high-quality communication when it matters most.
Tower top amplifier highlights
Good to know
Enhanced signal reception
Boosts weak signals at the tower top, improving base station sensitivity and overall network performance.
Boosts weak signals at the tower top, improving base station sensitivity and overall network performance.
Wide frequency compatibility
Optimised for 700/800 MHz bands, making it ideal for P25 public safety and emergency networks.
Optimised for 700/800 MHz bands, making it ideal for P25 public safety and emergency networks.
Scalable multi-port design
Supports up to 48 ports, ensuring seamless expansion for growing networks.
Supports up to 48 ports, ensuring seamless expansion for growing networks.
Low noise and high linearity
Maintains signal integrity while reducing interference, ensuring clear and reliable communication.
Maintains signal integrity while reducing interference, ensuring clear and reliable communication.
Weatherproof and rugged enclosure
Built for outdoor telecom towers, with a durable, weather-resistant casing for reliable performance in harsh conditions.
Built for outdoor telecom towers, with a durable, weather-resistant casing for reliable performance in harsh conditions.
Performance
Low noise figure
Industry leading noise figure of
2.5dB
Noise rating
Highest available IIP3 on the market
18dB
High system gain:
Provides up to 27.5 dB gain to enhance weak signals and improve network coverage.
Wide frequency support:
Operates in the 700/800 MHz bands, ideal for P25 public safety and critical communication networks.
Scalable multi-port design:
Supports configurations from 8 to 48 channels, enabling flexible network expansion.
Rugged and reliable:
Features an IP67 weatherproof enclosure, lightweight (<8 lbs.), and lightning protection (20 kA IEC 61000-4-5) for extreme environments.
Performance key data
| Parameter | Value |
| Frequency bands | 700/800 MHz |
| System gain | Up to 27.5 dB |
| Noise figure | ≤ 2.5 dB |
| Adjustable attenuation range | 15 dB to 0 dB |
| Return loss (RF ports) | > 14 dB |
| Maximum channels supported | 48 |
| Operating temperature | -30°C to +60°C (full spec), -40°C to +70°C (degraded) |
| Power supply | -48 VDC, 10W |
| Lightning protection | 20 kA IEC 61000-4-5 |
| Weight | <8 lbs (Single Branch Unit) |
TOWER TOP AMPLIFIER FAQ’s
General questions
Q: What is a Tower Top Amplifier (TTA)?
A: A Tower Top Amplifier (TTA) is a device that amplifies weak signals at the top of a communication tower before they travel down the feeder cables, improving base station receiver sensitivity and overall network performance.
Q: What are the main applications of Filtronic’s TTAs?
A: Filtronic’s TTAs are designed for public safety, emergency response, and critical communication networks, including P25 systems, first responder communication, and high-reliability wireless infrastructure.
Performance and features
Q: How does a TTA improve network performance?
A: By amplifying signals at the tower top, TTAs reduce signal loss, enhance receiver sensitivity, and extend coverage for reliable communication in urban, rural, and remote environments.
Q: What frequency bands do Filtronic’s TTAs support?
A: They are optimised for 700 MHz and 800 MHz bands, making them ideal for P25 public safety networks and other critical communication systems.
Q: How many ports does the Filtronic TTA support?
A: Filtronic offers scalable solutions, including models with up to 48 ports, providing greater capacity for expanding networks.
Q: Does the TTA affect signal clarity?
A: No, Filtronic’s TTAs maintain low noise and high linearity, ensuring clear, interference-free communication even in congested radio environments.
Integration and deployment
Q: Can the TTA be integrated into existing network infrastructure?
A: Yes, Filtronic’s TTAs are designed for seamless integration into existing P25, LMR, and other critical communication networks.
Q: Is the TTA weatherproof for outdoor installation?
A: Yes, Filtronic’s TTAs are housed in rugged, weatherproof enclosures, ensuring reliable operation in extreme environmental conditions.
Q: Does Filtronic provide technical support for installation?
A: Yes, Filtronic offers technical support and guidance for installation, calibration, and ongoing network optimisation.
Reliability and compliance
Q: What is the expected lifespan of Filtronic’s TTAs?
A: Filtronic’s TTAs are engineered for durability, providing long-term reliability in mission-critical networks.
Q: Are Filtronic’s TTAs compliant with industry standards?
A: Yes, Filtronic’s TTAs comply with public safety communication standards, ensuring interoperability across agencies and jurisdictions.
Purchasing and support
Q: Does Filtronic provide warranties for TTAs?
A: Yes, Filtronic provides a standard warranty. Please contact Filtronic for specific terms.
Q: Where can I purchase Filtronic’s Tower Top Amplifiers?
A: You can contact our team here for purchasing inquiries.
Tower Top Amplifiers application
Tower Top Amplifiers in action
Tower Top Amplifiers for critical communication applications
Filtronic’s Tower Top Amplifiers (TTAs) are essential for public safety, emergency response, and mission-critical communication networks, ensuring clear and reliable signal reception in demanding environments. By amplifying weak signals at the tower top, TTAs minimise signal loss over long feeder cables, significantly enhancing base station receiver sensitivity. This improvement is vital for networks where uninterrupted communication can make the difference in life-saving operations.
Designed for P25 public safety networks and other critical communication systems, Filtronic’s TTAs operate in the 700 and 800 MHz frequency bands, ensuring interoperability across multiple agencies and jurisdictions. Whether used by law enforcement, fire departments, or emergency medical services, these amplifiers extend network coverage and improve signal clarity, even in urban, rural, and remote areas.
Filtronic offers scalable TTA solutions, including high-capacity models with up to 48 ports, supporting the needs of expanding communication infrastructures. With low noise figures and high linearity, these amplifiers provide interference-free signal transmission, ensuring that first responders and mission-critical personnel remain connected when it matters most.
Built for harsh outdoor environments, Filtronic’s TTAs feature rugged, weatherproof enclosures, ensuring long-term reliability in extreme weather conditions. Backed by industry-leading expertise in RF engineering, these TTAs offer a future-proof solution for next-generation critical communication networks, delivering the performance, scalability, and resilience required for mission-critical operations.