LNB Power and Control

LNB Power and Control

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Description

Technical Specification of GX Series LNB Power Supply and Control Unit by Shenzhen Huashi Digital Technology Co., Ltd.

I. Product Overview​

The GX Series LNB Power Supply and Control Unit​ developed by Shenzhen Huashi Digital Technology Co., Ltd. is a specialized device designed for low-noise block downconverters (LNBs)​ in satellite communication systems. Housed in a standard 19-inch 1U rack-mounted chassis, it integrates a power supply module, high-precision oscillator, signal splitter/combiner, and intelligent control board. This unit provides local oscillator (LO) signals, DC power supply, and real-time monitoring​ for LNBs. Capable of monitoring 2/4/6/8 LNB channels, it features a keypad, LCD display, and communication interfaces, supporting both local operation via the front panel​ and remote operation through communication interfaces. The system delivers reliable performance and flexible operation, making it an ideal solution for satellite signal reception and management.

II. Core Functions​

This device offers the following key functionalities for 2/4/6/8 LNB channels:

  1. Power Supply and Current Monitoring: Delivers stable DC power (e.g., 13V/18V) to LNBs and optionally includes a 10MHz (default) or 100MHz (optional) internal local oscillator.
  2. Display Interface: Features an LCD screen displaying parameters such as LNB current (e.g., xxxmA) and alarm thresholds.
  3. Parameter Storage and Recovery: Supports saving configuration parameters and restoring them upon power-up.
  4. Customizable Alarm Thresholds: Allows setting upper and lower current limits​ for alarm triggers.
  5. External Oscillator Input: Supports external 10MHz (preferred) or 100MHz local oscillator input​ (not available on models without an internal oscillator).
  6. Remote Control Capability: Enables remote management via communication interfaces.

III. Product Features​

  • High Reliability: Hot-swappable power backup​ ensures uninterrupted operation in case of a single power module failure.
  • Safety Protection: Provides voltage and current alarm protection​ with customizable upper/lower thresholds to prevent damage from abnormal conditions.
  • Local and Remote Operation: The front panel includes a keypad and LCD display​ for real-time monitoring of LNB current, alarm thresholds, and other parameters. Remote operation is supported via communication interfaces (RJ-45, RS-232/RS-422/RS-485).
  • Flexible Configuration: Supports 13V/18V voltage switching​ (some models also support 22kHz control) and multi-channel independent monitoring​ (2/4/6/8 channels).
  • Optional Local Oscillator: Available with internal 10MHz (default) or 100MHz (optional) local oscillators​ (some models are designed without an internal oscillator, requiring an external LO source).

IV. Optional Features​

Customizable options based on user requirements:

  • Multi-Channel Expansion: Supports 2/4/6/8 independent LNB monitoring channels.
  • Voltage Control: Adjustable output voltages (e.g., 13V/18V/21V) on select models.
  • Local Oscillator Upgrades: Optional 10MHz or 100MHz high-precision local oscillators​ (default: 10MHz; 100MHz available upon request).
  • Extended Voltage Compatibility: Some models support 13V/15V/18V/21V voltage switching.

V. Model and Configuration Guide​

The GX Series is divided into two categories: models with internal local oscillators​ and models without internal oscillators.

1. Models with Internal Local Oscillators (10MHz/100MHz Options)​

Channels Model Local Oscillator Options Chassis Size Default LO Optional LO
2-Channel GX-2002 LNB-A 1: 10MHz (default) / 100MHz (optional) 19″ 1U Rack 10MHz 100MHz
4-Channel GX-4004 LNB-A 2: 10MHz (default) / 100MHz (optional) 19″ 1U Rack 10MHz 100MHz
6-Channel GX-6006 LNB-A 3: 10MHz (default) / 100MHz (optional) 19″ 1U Rack 10MHz 100MHz
8-Channel GX-8008 LNB-A 4: 10MHz (default) / 100MHz (optional) 19″ 1U Rack 10MHz 100MHz

Option Code Explanation:

  • A​ = Default 10MHz internal LO; D​ = Optional 100MHz internal LO (if no letter is specified, 10MHz is default).

2. Models without Internal Local Oscillators (External LO Required)​

Channels Model Local Oscillator Option Chassis Size Key Feature
2-Channel GX-1002 LNB-C 5: No internal LO 19″ 1U Rack Requires external 10MHz/100MHz LO
4-Channel GX-1004 LNB-C 6: No internal LO 19″ 1U Rack Requires external 10MHz/100MHz LO
6-Channel GX-1006 LNB-C 7: No internal LO 19″ 1U Rack Requires external 10MHz/100MHz LO
8-Channel GX-1008 LNB-C 8: No internal LO 19″ 1U Rack Requires external 10MHz/100MHz LO

Note: Models with suffix C​ (no internal LO) are designed for systems with external high-precision LO sources, offering cost efficiency and flexibility.

VI. Model Selection Guide​

Example: GX-2002 LNB-A​

  • Option Code: Suffix A​ indicates a default 10MHz internal LO, while D​ denotes an optional 100MHz internal LO​ (customizable). Suffix C​ (e.g., GX-1002 LNB-C) means no internal LO, requiring an external source.
  • Monitoring Target: This device is specifically designed for low-noise block downconverters (LNBs), ensuring their stable operation through power supply, current monitoring, and LO support.

VII. Performance Specifications​

1. Core Functionality​

Function Description
LNB Power & Monitoring Supplies DC power (e.g., 13V/18V) and monitors current per channel; optional 10MHz (default) or 100MHz LO output.
Status Display LCD screen shows real-time LNB current (e.g., xxxmA), alarm thresholds, and other parameters.
Parameter Management Saves configuration parameters and restores them after power cycling.
Custom Alarm Thresholds Allows setting upper/lower current limits for alarm triggers.
External LO Support Supports external 10MHz (preferred) or 100MHz LO input (not available on models without internal LO).
Remote Control Enables remote configuration and monitoring via RS-232/RS-422/RS-485 or Ethernet (RJ-45).

2. Interfaces & Electrical Characteristics​

Category Specifications
Input Interface​ N-50K connector (L-band signal input); supports 13V/18V/22kHz and reference frequency output.
Output Interface​ N-50K connector (L-band signal output).
Frequency Range​ 0.95–2.15 GHz (covers standard satellite signal bands).
Local Oscillator​ Frequency: 10MHz (default) or 100MHz (optional); Output Power: ≥+7.0 dBm (only for models with internal LO).
LO Stability​ Frequency Stability: ≤±5.0×10⁻⁹ (models with internal LO); Phase Noise: ≤-140 dBc/Hz@100Hz, ≤-150 dBc/Hz@1kHz, ≤-155 dBc/Hz@10kHz (models with internal LO).
Reference Signal​ Sine wave (50Ω) or square wave (10pF) selectable (only for models with internal LO).

3. LNB Control & Environmental Operating Conditions​

Category Specifications
LNB Control​ Supports 13V/18V voltage switching and 22kHz control (some models support 13V/15V/18V/21V).
Operating Voltage​ AC 220V±44V, 50Hz±5Hz (Input: IEC320 C14 three-pin power socket).
Communication Interfaces​ RJ-45 (Ethernet), DB-9S (female, supports RS-232/RS-422/RS-485; optional DB-9P (male)).
Operating Temperature​ 0°C to +50°C.
Storage Temperature​ -30°C to +70°C.

VIII. Application Scenarios​

  • Direct Broadcasting Satellite (DBS) Front-End Systems: Ensures stable multi-channel LNB power supply and monitoring for large-scale satellite reception (e.g., ChinaSat-9), supporting public broadcasting services like “Household Access” and “Village-to-Village” in rural areas.
  • Satellite Communication Ground Stations: Enhances signal reception quality in complex environments (e.g., broadcasting, emergency communications) through independent channel control and LO management.
  • Broadcasting & Media Networks: Ideal for areas without cable network coverage, offering flexible voltage switching and alarm protection to reduce maintenance costs.

Shenzhen Huashi Digital Technology Co., Ltd.​

(Note: Specifications are subject to updates with product iterations. Refer to the latest version for accurate details.)

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