Low-noise amplifier LNA 10 kHz–3 GHz, 32 dB

Product detailed description

This broadband low-noise amplifier (LNA) for the 10 kHz to 3 GHz range amplifies weak high-frequency signals by up to 32 dB and is easily powered via USB-C (5 V). It is ideal for any application where you need to lift a weak signal from an antenna or source above the noise floor – such as before SDR receivers (RTL-SDR, HackRF, Airspy), spectrum analysers, oscilloscopes, or as a preamplifier for radio reception, aviation and marine communications, ADS-B, LoRa, 433/868 MHz, or 2.4 GHz. Both input and output are routed to SMA (female) connectors with 50 Ω impedance, allowing the module to be easily inserted between the antenna and the receiver using standard coaxial cables.

Specifications:

• Type: wideband low-noise amplifier (LNA), MMIC
• Frequency range: 10 kHz – 3 GHz
  • the lower cut-off frequency is determined by the coupling capacitors at the input and output; by replacing them with 10 µF, operation is possible from approx. 5 kHz
• Gain: up to 32 dB (highest at lower frequencies, gradually decreasing towards the upper band limit)
• Input/output impedance: 50 Ω
• Max. input power: approx. −15 dBm (approx. 32 µW); the amplifier will overdrive at higher levels
• Power supply: 5 V DC via USB-C connector (USB charger, power bank, computer USB port)
• Connectors:
  • RFin: SMA female – signal input (from antenna / source)
  • RFout: SMA female – amplified signal output (to receiver)
  • Power supply: USB-C
• Mounting: 4 mounting holes at the corners of the board
• Typical applications:
  • preamplifier for SDR receivers (RTL-SDR, HackRF, Airspy etc.)
  • amplification of weak signals from an antenna (FM, VHF, ADS-B, LoRa, 433/868/915 MHz, 2.4 GHz)
  • measurement and laboratory work with weak RF signals

Important wiring notice:

• Connect both the input (RFin) and output (RFout) first, and only then connect the power supply. Do not connect or disconnect coaxial cables while the amplifier is powered, and do not leave the output unconnected while powered.
• Observe the signal direction – RFin is the input, RFout is the output. The amplifier will not function if connected in reverse.
• Do not apply a strong signal to the input (e.g. directly from a transmitter output or generator without attenuation) – there is a risk of overloading and damaging the amplifier.
• The amplifier is intended for reception only; it is not a final stage for transmission.
• For the lowest possible noise, use a stable power supply free from interference (high-quality USB power supply or power bank), high-quality and as short as possible coaxial cables, and shield the module if necessary.

Package contents:

• 1× LNA low-noise amplifier 10 kHz – 3 GHz with SMA and USB-C connectors

Note:

• This product is not a standalone functional unit and may require professional installation.
• Product images are for illustrative purposes only and may sometimes differ from the actual appearance of the item. However, this does not change their basic properties.