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7 Results Found For "preamp"
QRO.cz RX Preamp and Bias Tee Module Box Combo
This powerful combo from QRO.cz includes the RX Preamp Module Box with a 2N5109 transistor and a Bias Tee Voltage Injector, offering a complete solution for enhancing receive-only antenna systems. The preamp is based on the proven W7IUV design and delivers up to 18dB of gain with a built-in variable attenuator, allowing precise control over signal amplification. A multi-turn potentiometer enables fine-tuning of the transistor bias for optimal linearity and performance. Two onboard relays automatically switch the unit to bypass mode when power is not present. Power can be supplied either directly via an external DC source or through the included bias tee, which injects DC voltage into the coaxial feedline while isolating the radio from DC current. The bias tee simplifies installation by combining RF and DC over a single coaxial cable, making it ideal for powering remote devices like preamps, relays, or antenna switches. Together, these components provide a clean, efficient, and flexible receive system for antennas such as beverages, Double Half Delta Loops, flags, and other popular RX designs.
Not Yet Reviewed
$299.99
QRO.cz RX Preamp Module Boxes
QRO.cz RX Preamp Module Boxes, featuring the 2N5109 transistor, are based on the proven W7IUV design and are ideal for use with receive-only antennas such as beverages, Double Half Delta Loops, flags, and other popular RX antenna designs. The Preamp Box offers up to 18dB of gain, with a built-in variable attenuator that allows you to easily adjust the gain to your desired level. A multi-turn potentiometer lets you fine-tune the transistor bias for optimal performance. The unit includes two relays that automatically switch to bypass mode when no power is supplied. Power can be provided either through a direct external DC connection or via a bias tee for power over coax.
Not Yet Reviewed
$123.99
QRO.cz RX AuditePRE SDR Antenna Switch Controllers
QRO.cz RX AuditePRE SDR Antenna Switch Controllers combine the functionality of a T/R switch, a receive antenna input and a receive splitter with specialized switching, all with RF limiter protection. The transmit/receive (TX/RX) main antenna can be shared with both outputs, transceiver and receiver (SDR) with RF power limiter protection. These versatile devices are perfect for use with a separate SDR receiver for Spectrum Panadapter, WebSDR or as a Skimmer Server to contribute spots to the Reverse Beacon Network (RBN). The RX-AuditePRE features frequency coverage of 100 kHz–60 MHz including 160 through 6 meters with a maximum transmit power handling of 200W and a switchable 16 dB preamplifier. Included in the Package: RX-AuditePre Switch – Assembled and Tested DC Cable – DC barrel connector to stripped and tinned wires
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$509.99
QRO.cz RX AuditePRE3 SDR Antenna Switch Controllers
QRO.cz RX AuditePRE3 SDR Antenna Switch Controllers combine the functionality of a T/R switch, a receive antenna input and a receive splitter with specialized switching, all with RF limiter protection. The transmit/receive (TX/RX) main antenna can be shared with both outputs, transceiver and receiver (SDR) with RF power limiter protection. These versatile devices are perfect for use with a separate SDR receiver for Spectrum Panadapter, WebSDR or as a Skimmer Server to contribute spots to the Reverse Beacon Network (RBN). The RX-AuditePRE3 features frequency coverage of 100 kHz–60 MHz including 160 through 6 meters with a maximum transmit power handling of 200W and a switchable 16 dB preamplifier. Included in the Package: RX-AuditePre3 Switch – Assembled and Tested DC Cable – DC barrel connector to stripped and tinned wires
Not Yet Reviewed
$509.99
QRO.cz OLI 12 IP-Based Station Controllers
QRO.cz OLI 12 IP-Based Station Controllers are compact web-controlled IP relay controllers designed for seamless integration with K9AY++, 4-WAY beverage antenna systems, and 7ANT remote antenna controllers. Housed in a rugged aluminum enclosure, these controllers offer 12 positive-voltage outputs with built-in electronic fuse protection, making them ideal for remote antenna switching, preamp control, and band-pass filter selection. With a web-based user interface, support for Node-RED, Stream Deck, and Touch Portal, the OLI IP Controllers enable intuitive and flexible station automation. They connect via a standard DB15 cable and LAN port, requiring no firmware uploads or complex configuration—just plug in and go.
Not Yet Reviewed
$258.99
QRO.cz OLI 16 IP-Based Station Controllers
QRO.cz OLI 16 IP-Based Station Controllers are compact, universal web-controlled IP relay controllers housed in a rugged aluminum enclosure, these controllers offer 16 positive or negative (GND) voltage outputs with built-in electronic fuse protection, making them ideal for remote antenna switching, preamp control, and band-pass filter selection. With a web-based user interface, support for Node-RED, Stream Deck, and Touch Portal, the OLI IP Controllers enable intuitive and flexible station automation. They connect via a standard DB25 male cable and LAN port, requiring no firmware uploads or complex configuration.
Not Yet Reviewed
$271.99
QRO.cz Bias Tee Receive Feedline Voltage Injectors
QRO.cz Bias Tee Receive Feedline Voltage Injectors are engineered to inject DC voltage into a receive antenna system's coaxial cable while isolating the radio port from DC current. This allows you to power remote devices—such as preamplifiers, relays, or switching systems—without the need for separate power lines, simplifying your installation by combining RF and DC over a single coaxial feed. Typically installed at the receiving end of the coaxial cable, the bias tee passes DC power from an external source to the coax line running to the powered device. It uses a feed inductor to deliver DC to the device side and a blocking capacitor to prevent DC from reaching the radio. For added flexibility, bias tees can be used on both ends of the coaxial line to serve as DC input and output points.
Not Yet Reviewed
$93.99