GX1213L 1200–1300 MHz L Band LNB 高频头 L波段低噪声放大下变频器

Description

GX1213L 1200–1300 MHz L Band LNB

Low-Noise Block Downconverter LNB

Product Overview

Shenzhen Huashi Digital Technology Co., Ltd. presents an L-band (1.2–1.3 GHz) low-noise block downconverter (LNB) for reception and test/measurement applications. It integrates a low-noise amplifier (LNA) and downconverter to translate RF signals to an IF of 20–120 MHz, providing ≥45 dB conversion gain with 1 dB step, 30 dB range gain adjustability. Remote control is supported via RS232/RS422/RS485, and the RF ports are SMA-K (50 Ω). Compact and easy to integrate, it is suitable for ground station front ends, spectrum monitoring, weak-signal reception, and link gain shaping.

Key Specifications

Item	Parameter
Input frequency	1.2–1.3 GHz (1200–1300 MHz)
Output IF	20–120 MHz
Conversion gain	≥45 dB
Gain adjustability	30 dB range, 1 dB step
Gain stability	0.2 dB/10 minutes
Noise figure	2 dB (typical)
Input power range	-38 ~ -68 dBm
Output P1dB	≥+17 dBm
Control interface	RS232 / RS422 / RS485
RF connectors	SMA-K (50 Ω)

Features

High gain with low noise: maintains ≥45 dB conversion gain while keeping the noise figure as low as 2 dB, increasing weak-signal link margin.

Fine gain control: 1 dB step, 30 dB range for system-level gain shaping and dynamic range optimization.

Industrial-grade stability: 0.2 dB/10 minutes gain stability for long-term, continuous operation and stabilitysensitive applications.

Wide input tolerance: accepts -38 ~ -68 dBm input range, compatible with various front-end attenuator/amplifier configurations.

Strong drive capability: output P1dB ≥ +17 dBm to drive subsequent stages or long cable runs.

Multi-interface remote management: RS232/RS422/RS485 options for easy integration with network management, monitoring, and automated test systems.

Applications and Interface Notes

Typical applications: L-band satellite/ground station front ends, remote weak-signal reception, spectrum monitoring and analysis, link budget optimization, and AGC/ALC preamplifier stages.

Interface and power: RF ports are SMA-K (50 Ω); control via RS232/RS422/RS485 using shielded twisted pair (STP) with proper grounding. Power supply and power consumption are specified on the equipment nameplate/communication protocol (remote gain adjustment and status readback require a host controller or PC).

Setup and Debugging Recommendations

Gain setting: set the IF gain so the overall link operates in the linear region according to the receiver’s input range and the noise of subsequent stages; then fine-tune in 1 dB steps to balance C/N and distortion.

Input level: keep the front-end signal within -38 ~ -68 dBm to avoid distortion or compression; add/remove attenuation as needed.

Cabling and matching: use low-loss 50 Ω coaxial cables and keep them as short as possible; ensure connectors are fully tightened and weatherproofed to reduce reflections and insertion loss.

Control and monitoring: use RS232/RS422/RS485 to read device status and alarms; configure communication parameters (e.g., address, baud rate, parity) per the manual.