LNA HF SDR 500 kHz - 30 MHz LNA4HF preamplifier View larger
LNA HF SDR 500 kHz - 30 MHz LNA4HF preamplifier
  • LNA HF SDR 500 kHz - 30 MHz LNA4HF preamplifier
  • LNA HF SDR 500 kHz - 30 MHz LNA4HF preamplifier

OPA Design


New product


Online only

LNA preamplifier for HF SDR 500 kHz to 30 MHz from F1OPA

rating Read the review
Average rating: 5/5 Number of reviews: 1

The LNA HF from F1OPA is a pre-amplifier and a low-pass filter (LNA), very powerful (+18dB to +20dB), with SMA Female connectors, for HF frequencies and short waves from 500 kHz to 30 MHz, with electrostatic protection (ESD) and LED operation indicator.

It makes it possible to significantly improve reception performance, in shortwave and on the HF amateur radio bands, using an RTL-SDR dongle with the Ham it up HF SDR converter, for example.

The power supply is to be made yourself by soldering 2 power cables (VCC + and -) on the board and supplied between 7V and 13V.

Comes with: 1 HFLNA F1OPA PCB board. Aluminum case available as an option.

This material replaces the LN4HF which is no longer manufactured.

More details

28,75 € tax excl.

In stock

   More than 10 Items


Data sheet

LNA HF specifications (ex. LNA4HF)

Power supply: 7V to 13V DC
Consumption: 29mA
Frequency range: 500kHz to 30MHz
Reception gain: +18dB to +20dB
NF: 3.4dB @ 15Mhz
Impedance: 50 ohms
Electrostatic protection (ESD)
LED operation indicator
Antenna connector: SMA Female
Dimensions: 40 x 30 (excluding SMA connector)
Amateur radio design: F1OPA
2 years warranty*

The antenna input and output are tuned to 50 ohms, and there is no significant degradation with 75 ohm TV cables.


This preamplifier is very powerful and to be used with care, never use it near strong signals, nor emit a radio signal nearby, (FM radio, amateur radio station, walkie-talkie, pmr446, etc.) under penalty of "grilling" "the LNA and your HF or SDR receiver!

This LNA is also very sensitive to electrostatic discharges which can damage it.

How to protect the LNA from electrostatic discharges?

Electro-static discharge can damage the LNA if it is not protected or used properly.

1 - Never leave the LNA plugged in permanently or place it permanently behind an antenna on the mast
2 - Disconnect the antenna and make sure the LNA and the antenna are properly grounded, before reconnecting the antenna, discharge the static electricity from the cable
3 - This short waves LNA is equipped with ESD protection by BAV99 diode, so in the event of lightning it is the diode that will be damaged but not the rest of the LNA card.

No LNA will be taken back or exchanged for misuse.

* The warranty does not cover damage that may result from a mounting error, incorrect antenna adjustment (SWR), maximum input power not respected, or a short-circuit of the power supply or coaxial line and damage from electrostatic discharge.

Additional or similar equipment

  • Ham it Up 1.3 & 1.3+ Converter HF 0.5-50Mhz Nooelec

    Nooelec's Ham It Up v1.3 is an up-converter HF, equipped with the 125Mhz filter soldered on the PCB and allows to listen to all MF / HF bands from 0.5 to 50 Mhz, in all modes of modulation, from a

    54,17 € tax incl.

    54,17 €tax excl.

    In stock
  • SMA Male UHF Female Adapter (SO-239)

    SMA Male UHF Female (SO-239) Adapter.

    4,17 € tax incl.

    4,17 €tax excl.

    In stock
  • Pigtail SMA Male - SMA Male 15/30/50/100cm RG316

    Pigtail RF adapter SMA Male to SMA Male to connect for example a converter Ham it up to a HackRF One, or SDRPlay, and any device with a SMA female connector. Coaxial cable RG 316 50 ohms. Available in

    4,17 € tax incl.

    4,17 €tax excl.

    In stock
  • Active Mini Antenna 0-50 Mhz for SDR Receiver

    This Mini-Whip SDR active antenna allows reception of HF frequencies from 0 to 50 mhz with an SDR receiver.Compact in size, the mini-whip active antenna can be used independently with a 9-volt battery

    20,75 € tax incl.

    20,75 €tax excl.

    In stock
  • Adapter SMA male SMA male

    This RF adapter allows is equipped with an SMA Male connector on both sides.It allows to connect for example 2 cables or connectors in SMA female.

    3,75 € tax incl.

    3,75 €tax excl.

    In stock
  • HF Antenna Balun 1:9 for SDR

    This balun is the perfect accessory to connect a long wire antenna, for example with the converter HF SDR Ham it Up to listen shortwave and HF bands from 0.5 to 30Mhz, but this balun can work up to

    11,58 € tax incl.

    11,58 €tax excl.

    In stock
  • G5RV wire antenna HF multiband

    Invented by G5RV amateur, R. Louis VARNEY published for the first time the technical documentation of its antenna in November 1966. The G5RV wire antenna have 2 versions: 1/2 half size, about 16

    40,83 € tax incl.

    40,83 €tax excl.

    Out of stock, available in 3-4 weeks
  • Broadcast FM Band Cut filter by RTL-SDR.com

    This band-cut filter is design by RTL-SDR.com, it blocks and reject broadcast FM band between 88 to 108 MHz with over 50dB of attenuation. Insertion loss is less than 0.5 dB between 0-1 GHz, and less

    20,42 € tax incl.

    20,42 €tax excl.

    In stock
  • Balun 1:1 HF 1.7Mhz à 40Mhz Diamond BU50/A

    Diamond BU50/A balun 1:1, genuine, operates from 1.7 to 40Mhz and allows to receive and transmit on HF bands.Technical data sheet of the HF BU50A balun:● Operating frequency from 1.7 to 40MHz●

    30,69 € tax incl.

    30,69 €tax excl.

    In stock
  • Broadcast AM Band Cut filter by RTL-SDR.com

    This high-pass notch filter is designed by RTL-SDR.com and rejects the AM broadcast from 500 kHz to 1.7 MHz, with attenuation of more than 50dB. In fact, because of the attenuation, the filter is

    19,08 € tax incl.

    19,08 €tax excl.

    In stock
  • LNA Wide Band 50-4000Mhz RTL-SDR

    This wide-band LNA preamp improves reception performance from 50 Mhz to 4 Ghz, it is based on SPF5189Z, with a noise factor of less than 1 dB.This LNA is designed to be powered by BIAS-T with a power

    23,25 € tax incl.

    23,25 €tax excl.

    In stock
  • LNA Wide Band 50-2500Mhz amplifier F1OPA

    Wide-band LNA preamp, based on PGA-103+, to improve reception performance from 50 Mhz to 1500 Mhz, with a maximum gain of 20-24dB and a noise factor of 0.4dB.This VHF-UHF LNA offers a very good

    29,92 € tax incl.

    29,92 €tax excl.

    In stock
  • Nooelec Balun 1:9 V2 for HF SDR reception 0-30Mhz

    The new version Nooelec Balun 1:9 v2 allows to add a wired or dipole antenna type to listen HF bands from 0 to 30Mhz from the Ham It Up converter, an SDRPlay receiver or equivalent covering the HF

    20,24 € tax incl.

    20,24 €tax excl.

    In stock
  • Half aluminium case for PCB OPA Design

    This milled half aluminum box is specially designed for the RF protection of PCB's from F1OPA Design: LNA VHF-UHF, Bias-T, 2.4Ghz amplifier, SAW 868Mhz filters, ADS-B, QO-100 2.4Ghz and HF LNA.Case

    16,58 € tax incl.

    16,58 €tax excl.

    In stock
  • Active Loop antenna MLA-30 Plus MegaLoop 500 Khz - 30 Mhz

    MLA-30 Plus magnetic loop active antenna for receiving HF bands from 500 kHz to 30 MHz.The MLA-30+ antenna can be used with the RTL-SDR V3 stick in direct conversion mode, with the Ham it up

    41,58 € tax incl.

    41,58 €tax excl.

    In stock
  • Diamond CMF-2000 common mode filter TVI RF choke

    The Diamond CMF-2000 is a common mode filter that will prevent TVI and EMI CEM interference, caused by the transmission coaxial cable.Usable from 1 to 54 Mhz all bands, HF amateur radio, CB 27 Mhz,

    129,08 € tax incl.

    129,08 €tax excl.

    In stock
  • MRP-2000 MK2 Moonraker preamp for BNC scanner

    Moonraker MRP-2000 Mk2 broadband preamplifier for scanners or receivers. This preamplifier covers from 25 to 2000MHz with a gain of up to 20dB maximum. It is supplied with a power cable and requires

    41,58 € tax incl.

    41,58 €tax excl.

    Out of stock, available within 1 to 2 months


Click here to leave a review

rating 5
.Dear Address!

Thank you for the amplifier you sent, it works very well.
Congratulation to the circuit and panel designer.engineer, it\'s super small and consumes very little.
I\'m not use power supply, I use a 9V battery.
Even so, it amplifies 25-28dB.
.Fast service and postage.
Careful packaging.
Best Regards

Delivery Europe & Overseas

Stock and shipped from France

Product return

14 days to return, 2 warranty

Email support

Response within 24h to 72h

Secure payment

SSL, VISA, Mastercard, Paypal