Structured Manufacturing Data (2026)

Low-Noise Block Downconverter (LNB)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Low-Noise Block Downconverter (LNB) used in the Computer, Electronic and Optical Product Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Low-Noise Block Downconverter (LNB) is characterized by the integration of Feedhorn and Waveguide. In industrial production environments, manufacturers listed on CNFX commonly emphasize Aluminum housing construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A device that receives and downconverts satellite signals to a lower frequency for transmission via coaxial cable.

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Product Specifications

Technical details and manufacturing context for Low-Noise Block Downconverter (LNB)

Definition
A critical component in satellite communication systems that is mounted on satellite dishes. It receives weak microwave signals from satellites, amplifies them with minimal added noise, and converts them to lower frequencies (typically L-band) for transmission through coaxial cables to satellite receivers inside buildings.
Working Principle
The LNB receives high-frequency satellite signals (e.g., Ku-band: 10.7-12.75 GHz, C-band: 3.4-4.2 GHz) via the feedhorn. It amplifies these weak signals using a low-noise amplifier (LNA) to minimize signal degradation. Then, a local oscillator (LO) generates a fixed frequency that mixes with the incoming signal in a mixer, producing intermediate frequencies (IF) in the 950-2150 MHz range. These lower-frequency signals are then transmitted through coaxial cable to the indoor receiver.
Common Materials
Aluminum housing, Printed circuit board (PCB), Semiconductor components (GaAs FETs/HEMTs), Dielectric materials, Copper conductors
Technical Parameters
  • Noise temperature or noise figure indicating signal degradation during amplification (K) Standard Spec
Components / BOM
  • Feedhorn
    Collects and focuses satellite signals into the waveguide
    Material: Aluminum or plastic
  • Waveguide
    Transmits microwave signals from feedhorn to PCB
    Material: Aluminum
  • Low-Noise Amplifier (LNA)
    Amplifies weak satellite signals with minimal added noise
    Material: Gallium Arsenide (GaAs) semiconductor
  • Local Oscillator (LO)
    Generates stable frequency for downconversion mixing
    Material: Quartz crystal, semiconductor components
  • Mixer
    Combines incoming signal with LO frequency to produce IF
    Material: Semiconductor diodes or transistors
  • IF Amplifier
    Amplifies the downconverted intermediate frequency signal
    Material: Semiconductor components on PCB

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Low-Noise Block Downconverter (LNB).

LNB LNBF low-noise block downconverter for satellite TV high-frequency LNB with GaAs FET components aluminum housing LNB for durable outdoor use LNB with waveguide and feedhorn assembly professional satellite signal downconverter for broadcast

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Satellite Communication Systems
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric pressure only (sealed unit, not pressure-rated)
other spec: Input Frequency Range: 10.7-12.75 GHz, Output Frequency: 950-2150 MHz, Local Oscillator Frequency: 9.75/10.6 GHz, Noise Figure: 0.3-0.7 dB typical
temperature: -40°C to +70°C (operational), -55°C to +85°C (storage)
Media Compatibility
✓ Satellite RF signals (Ku-band, C-band) ✓ Coaxial cable transmission (75Ω impedance) ✓ Outdoor weather exposure (with proper housing)
Unsuitable: High-vibration industrial environments without vibration damping
Sizing Data Required
  • Satellite frequency band (Ku/C/Ka-band)
  • Required LO frequency and polarization (single/dual/universal)
  • Antenna size and required gain/noise figure

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Dielectric breakdown in RF amplifier
Cause: Moisture ingress due to compromised weather seals or condensation from thermal cycling, leading to short circuits and signal loss.
Local oscillator frequency drift
Cause: Thermal stress on oscillator components from prolonged exposure to temperature extremes, causing component aging and frequency instability.
Maintenance Indicators
  • Intermittent or complete loss of signal despite clear line-of-sight and proper alignment
  • Visible corrosion, cracking, or water droplets inside the LNB housing or on the feedhorn
Engineering Tips
  • Apply high-quality dielectric grease to all coaxial connections and ensure weatherproofing boots are intact to prevent moisture ingress.
  • Install a passive thermal shield or sunshade to reduce direct solar heating, minimizing thermal cycling stress on electronic components.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 (Quality Management Systems) CE Marking (Electromagnetic Compatibility Directive 2014/30/EU) ASTM E595-15 (Standard Test Method for Total Mass Loss and Collected Volatile Condensable Materials from Outgassing in a Vacuum Environment)
Manufacturing Precision
  • Local Oscillator Frequency Stability: +/- 500 kHz
  • Gain Flatness: +/- 0.5 dB across operating band
Quality Inspection
  • Phase Noise Measurement Test
  • Return Loss/VSWR Test

Factories Producing Low-Noise Block Downconverter (LNB)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the primary function of a Low-Noise Block Downconverter (LNB)?

The LNB receives high-frequency satellite signals, amplifies them with minimal noise using its Low-Noise Amplifier (LNA), and downconverts them to a lower intermediate frequency (IF) for efficient transmission through coaxial cable to receivers.

Why are GaAs FETs or HEMTs used in LNBs?

Gallium Arsenide Field-Effect Transistors (GaAs FETs) and High Electron Mobility Transistors (HEMTs) are semiconductor components that provide excellent high-frequency performance with very low noise figures, crucial for maintaining signal integrity in satellite reception applications.

How does the aluminum housing benefit the LNB?

The aluminum housing offers durability and corrosion resistance for outdoor installation, provides effective electromagnetic shielding to prevent interference, and aids in heat dissipation from internal components like the Local Oscillator and amplifiers.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Computer, Electronic and Optical Product Manufacturing.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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