Preamp LNA for HF SDR SDR accessory LNA4HF-284 View larger

LNA4HF-284

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Preamp LNA for HF SDR

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The LNA4HF is a pre-amplifier and a low-pass filter (LNA) with SMA female RF connectors and for RF frequencies covering all bands from 150 kHz to 30 MHz.

It improves greatly reception performance, on shortwave and HF amateur bands, for a USB stick TNT / RTL-SDR or the HackRF One.

Power is to build yourself via a 6V/9V by connecting simply 2 power cables or 5V with a modification on the board.

It is also possible to remove the LNA filter to be able to use the preamp up to 2GHz with another mod of the board.

See also the LNA4ALL version for 28Mhz to 2GHz preamplifier VHF-UHF bands.

More details

34,50 € tax incl.

In stock

Warning: Last items in stock!

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More info

Specifications LNA4HF

Power supply: 6-9V DC or 5V (with modification-it-yourself)
Consumption: 18mA
Frequency range: 150kHz - 30MHz
Receive gain: 18 to 20 dB
NF: 1-2 dB
Impedance: 50 ohms
Antenna Connector: SMA Female
Dimension: 25x25 mm

The input and output of the antenna are tuned to 50 ohms, and there is no significant deterioration with cable TV 75 ohms also.

VERY IMPORTANT

This preamplifier LNA is highly efficient and need to be use with caution, never use near strong signals, nor transmit a radio signal nearby (FM radio station amateur radio, walkie-talkie, pmr446, etc.) under penalty of "grill" your device immediately SDR HackRF One or AirSpy!

How to protect the LNA from ESD?

The static discharge can damage the LNA if it is not protected and used properly.

1 - Never leave the LNA plugged permanently or placed permanently behind an antenna on the mast
2 - Disconnect the antenna and ensure proper grounding of the LNA and antenna, before reconnecting the antenna cable discharging static electricity
3 - It is also possible to add extra protection diode BAV99 welding (scratch first location) to the input of the antenna as shown in green on the following picture:

So if lightning the diode will be damaged but not the rest of the LNA card.

No LNA will be returned or exchanged due to misuse.

The warranty does not cover damage that may result from an assembly error, an incorrect antenna setting (ROS), a maximum input power not respected, a short circuit of the power supply or coaxial line and damage from electrostatic discharge.

Questions



Elie on 2020-04-10
Question: 

Je voudrai acheter un préampli pour mon rsp1a, comment faire pour avoir ce produit ?

Answer: 

Le récepteur SDR RSPA1 de chez SDRPlay dispose déjà d'une préampli et nous ne recommandons pas d'en ajouter un 2ème.


Cela risquerait de saturer le récepteur et simplement augmenter le niveau de bruit et le QRM de manière importante en dégradant la qualité de la réception.


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