QRO.cz RX Preamp Module
SKU Part Number: QRO-RXABOX
The QRO.cz RX Preamp Module from QRO.cz is a high dynamic range receive preamplifier designed specifically for receive-only antenna systems....
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£102.95
Availability: In stock
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The QRO.cz RX Preamp Module from QRO.cz is a high dynamic range receive preamplifier designed specifically for receive-only antenna systems. Featuring the rugged 2N5109 transistor and based on the proven design by W7IUV, this preamp is ideal for enhancing weak-signal performance on low-noise RX antennas.

Perfect for:

  • Beverage antennas

  • Double Half Delta Loops

  • Flag antennas

  • Loops-on-ground

  • Other dedicated receive antenna designs

Whether you're chasing DX or operating in a high-RF contest environment, this module delivers clean, adjustable gain with exceptional linearity.


Built for Serious Receive Performance

The QRO.cz RX Preamp Module is engineered for operators who demand:

  • High dynamic range

  • Strong-signal immunity

  • Adjustable gain control

  • Reliable fail-safe operation

  • Flexible installation options

With its 2N5109 transistor core, adjustable bias control, and automatic bypass relays, this preamp is a robust, field-ready solution for improving receive performance on any dedicated RX antenna system.

Reference the IN port is for the antenna and the OUT port is for the receiver

 

Key Features

High Dynamic Range Performance

  • Up to 18 dB of adjustable gain

  • Real IP3 of 37 dBm

  • Output power up to 26 dBm

  • Excellent strong-signal handling and low intermodulation distortion

Designed to maintain signal clarity even in crowded band conditions.


User-Adjustable Gain & Bias

  • Built-in variable attenuator allows gain adjustment from 0–18 dB

  • Multi-turn potentiometer for precise transistor bias tuning

  • Fine control lets you optimize performance for your specific antenna and RF environment


Automatic Dual-Relay Bypass

Two internal relays automatically switch the unit into bypass mode when power is removed, ensuring:

  • Fail-safe operation

  • No signal loss if power is interrupted

  • Seamless integration into receive antenna systems


Flexible Power Options

Operate the RX Preamp Module via:

  • Direct 12–15 VDC external connection

  • Bias tee (power over coax)

This flexibility allows easy installation at the antenna feedpoint for improved noise performance and reduced feedline loss.


Technical Specifications

  • Frequency Range: 0.1–30 MHz (Broadband HF coverage)

  • Gain: Adjustable 0–18 dB

  • Impedance: 50 Ohm

  • IP3 Rating: 37 dBm @ 18VDC / 90 mA

  • Output Power: Up to 26 dBm

  • Power Supply: 12–15 VDC (direct or via coax)

  • Current Draw: Up to 180 mA (including relays)

  • RF Connectors: SO-239 (UHF female)

  • Protection: Jumper-selectable front-end diode protection

  • Bypass: Dual-relay automatic bypass when unpowered

  • Assembly: Fully assembled and tested SMD version

  • Enclosure Rating: IP56

  • Dimensions: 3.94 x 3.94 x 1.97 in (100 x 100 x 50 mm)

  • Weight: 0.75 lb (0.34 kg)

Shipping:

We have several shipping options for our products, including next-day and Saturday/Sunday delivery for certain items. Please see these options at checkout.

Returns:

If you have any equipment that needs to be returned to Martin Lynch & Sons, please fill out the form below:

Click here for returns form

Upon receipt of goods you have 14 days to return goods however the goods must be returned in original packaging and care must have been taken with the goods you wish to return. Under distance selling regulations you are not entitled to any refund on carriage charges or modification charges made at your request. Large items cannot be returned if they have been assembled, unless faulty.

Warranty Terms and Conditions

Outside of the 14 faulty return period, returned items cannot be accepted, unless covered by manufacturer's warranty. We will repair as much as possible on site however in exceptional circumstances products may have to be returned to the manufacturer of distributor.

For repairs/replacements under manufacturer’s warranty for any item please download a ML&S return form from the link above and return to ML&S with the faulty product.

International Warranty information

Warranty service for items we sell is available in the U.K. only, unless otherwise noted. It is your responsibility to pay freight for returned items to the U.K. and back to you for desired warranty coverage. All of our NEW products come with a minimum 12 month warranty, (Yaesu & Icom 24 months), with up to 90 days on second-hand equipment. Items returned for service must state "returned goods for repair" on the return air waybill or U.K. import customs duties apply and will be added to your invoice. For more info about returning items please contact our customer help desk, [email protected]