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4O3A Parts and Accessories
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4O3A Power Genius XL 3X1 HF/6M Amplifiers
4O3A Power Genius XL 3X1 HF/6M Amplifiers are solid-state amplifiers capable of delivering 1500W+ output across the 160-6M amateur bands, engineered for high-performance amateur radio use. The PGXL 3X1 uses dual NXP MRF1K50H LDMOS transistors, each rated for 1.5 kW, providing high headroom, low IMD, and clean signal output. The Power Genius XL 3x1 features a 3-to-1 antenna switching module, allowing you to connect three antennas to a single radio. As a result, the software interface differs slightly to accommodate this functionality. The integrated MEffA™ algorithm dynamically adjusts DC voltage for optimal efficiency. Additional features include fast SWR protection, advanced thermal management, and seamless integration with FlexRadio systems via SmartSDR. They also support third-party radios through Ethernet, RS232, CI-V, and BCD interfaces.
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$5,490.00
Special Offer
4O3A Tuner Genius XL SO2R Antenna Tuners
4O3A Tuner Genius XL SO2R Antenna Tuners are fully automatic, high-power antenna tuners designed specifically for Single Operator, Two Radio (SO2R) operation, and feature dual inputs and dual outputs. Each input is independently paired with one output. Covering 1.8 to 54 MHz, it can match antennas with up to 10:1 SWR and handle up to 2000W, making them ideal for high-performance contesting and DXing. Built to commercial-grade standards, the TGXL SO2R integrates seamlessly with FlexRadio's 6000 and 8000 series transceivers and the Power Genius XL amplifier, while also supporting third-party radios via LAN, RS232, CI-V, and other interfaces. With intuitive control via front panel or Windows software, the TGXL-SO delivers unmatched flexibility, precision, and automation for serious operators.
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$2,499.00
4O3A NC-1 Noise Canceling Bluetooth Boom Mic Headsets
4O3A NC-1 Noise Canceling Bluetooth Boom Mic Headsets are top-of-the-line Headphone Boom Microphone combinations that are designed primarily for contesting, but also work perfectly for everyday use. The NC-1 are light and comfortable over-the-ear headphones that makes using them a truly enjoyable experience. With advanced Bluetooth capability, amazing audio reproduction and external and built-in microphones, this is also an excellent multi-purpose headphone for mobile phone and multimedia use. The contesting team at 4O3A in Montenegro couldn't find the perfect headset, so they designed their own. Now sold by DX Engineering as O3A-4O-NC-1, this headset combination consists of two parts, the NC-1 Headphone Set and the MC-1 Boom Mic Set, both available separately. A All features and specs appear on each part detail page. +++ NC-1 Noise Canceling Bluetooth Headphone Set (O3A-4O-NC-HP) - Excellent Ambient Noise Cancelling - Crystal Clear Sound - Bluetooth 5.0 for Android and Apple mobile devices, laptops, tablets, PC and interfaced radios - Long life 750mA rechargeable Li-Ion battery - Includes a zipper case, USB A to USB C charge cable and an extra pair of ear cushions. +++ MC-1 Boom Mic Set (O3A-4O-NC-MC-1) - Versatile affordable plug-in condenser boom mic with universal 3.5mm mic and headphone cables - Works for all transceivers (with optional adapters) and plugs into laptops, tablets and PC - Superior vocal clarity with a wide, flat frequency response - Includes soft case, 3.5mm to 6.35mm adapter and two boom mic windscreens.
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$393.98
403A Antenna Genius 8X1 Smart Antenna Switches
403A Antenna Genius 8X1 Smart Antenna Switches are designed to connect up to eight antennas to a single radio with seamless control and automation. Engineered for reliability and flexibility, they integrate effortlessly into both local and remote station installations. Whether you're a contester, DXer, or casual operator, the Antenna Genius 8x1 offers robust switching capabilities, intuitive software control, and future-proof expandability through regular firmware updates and third-party software support.
Not Yet Reviewed
$839.99
4O3A High Power Band Pass Filters
4O3A High Power Band Pass Filters are intended for installation on the output side of a linear amplifier, filtering out harmonics as well as broadband noise from the power amplifier. Typical Applications: • Mitigating intra and inter station interference during contests. • Protecting receiver circuitry from damage. • Reducing RFI egress and ingress during everyday operation. • Enabling full duplex operation (transmitting and receiving simultaneously) on capable transceivers. • High power handling capability – up to 4,500 Watts ICAS. • Exceptional out of band rejection, typically > 55 dB and sometimes as high as 75 dB on adjacent 'contest' bands thanks to the 5 pole filtering.
Not Yet Reviewed
$515.99
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$557.99
4O3A Rotator Genius Smart Rotator Controllers
4O3A Rotator Genius Smart Rotator Controllers are a high-precision, network-enabled rotator controllers that use a magnetic sensor to read azimuth. They support control via Windows and Android apps and integrate with the 4O3A Genius ecosystem. Typically mounted at the base of a tower in a waterproof housing or installed in the shack, they are compatible with most rotators and control is provided via LAN, USB, or Wi-Fi. A built-in web interface allows multi-user access and full remote operation. Rotator Genius supports independent control of two rotators, making them suitable for stacked arrays or complex installations.
Not Yet Reviewed
$869.99
4O3A HFC4500 Signature Series Antenna Triplexer/Combiners
4O3A HFC4500 Signature Series Antenna Triplexer/Combiners are truly a game changer for SO2R, multi-operator contest stations, DXpeditions, and Field Day operation. They allow a single triband 20/15/10-meter Yagi antenna, fed with one coaxial feedline, to be used by three stations simultaneously, with each station running up to 4.5kW. The 4O3A Signature Series Triplexer System eliminates the need for separate monoband Yagi's on the 20m, 15m, and 10m bands. Three operators, three stations, and three amps—but only one feedline and one antenna. The 4O3A HF Triplexer System uses the high-power HFC4500 Combiner, which connects to a triband 20m/15m/10m antenna, and provides dedicated ports for 20m, 15m, and 10m. Each port must be connected to a 4O3A Series S Bandpass Filter. The Combiner is not intended for standalone use.
Not Yet Reviewed
$642.99
4O3A PGXL Rack Mount Shelf
The 4O3A PGXL Rack Mount Shelf is a precision-engineered solution designed specifically to house the 4O3A Power Genius XL amplifier in a standard 19-inch equipment rack. Built from durable aluminum with a sleek, professional finish, this shelf ensures secure, vibration-free mounting while maintaining optimal airflow and accessibility. These PGXL Rack Mount Shelves offers a clean, reliable way to integrate your PGXL into your rack system. It's the ideal companion for the Power Genius XL amplifier. Requires Assembly.
Not Yet Reviewed
$244.99
4O3A OM Module Programmable Output Relay Modules
4O3A OM Module Programmable Output Relay Modules are designed for integration with the Antenna Genius 8x2, 8x1, or Station Genius controllers. Housed in a durable stainless steel enclosure, these Output Modules feature 16 dual-output relays, each with independent A and B terminals that can be configured for positive voltage, ground, or a combination of both. This flexibility allows for precise control of external devices such as antenna switches, bandpass filters, or other station automation components. Each output is clearly labeled and equipped with an LED indicator, providing instant visual feedback on relay status. Whether you're building a high-performance contest station or automating a complex RF environment, the OM Module delivers reliable switching with intuitive configuration via Windows-based software associated with the supported controllers.
Not Yet Reviewed
$185.99
4O3A Antenna Genius 8X2 Smart Antenna Switches
4O3A Antenna Genius 8X2 Smart Antenna Switches are high-performance, LAN-enabled antenna switches that connect eight antennas to two radios—ideal for SO2R (Single Operator, Two Radio) and multi-operator contesting. Designed for seamless integration with FlexRadio systems and third-party radios, they support automatic or manual antenna switching via LAN, BCD, or the downloadable Windows control app. Built with a rugged stainless steel chassis and advanced hardware-level interlocks, the AG8X2 ensures that no two radios can transmit on the same antenna simultaneously, protecting your equipment. With exceptional port-to-port isolation and support for up to 3000W, the Antenna Genius 8X2 delivers reliable, high-isolation switching for demanding HF and 6m operations.
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$950.00
Special Offer
4O3A Power Genius XL HF/6M SO2R Amplifiers
4O3A Power Genius XL HF/6M SO2R Amplifiers are solid-state amplifiers capable of delivering 1500W+ output across the 160-6M amateur bands, engineered for high-performance amateur radio use. The PGXL uses dual NXP MRF1K50H LDMOS transistors, each rated for 1.5 kW, providing high headroom, low IMD, and clean signal output. It is the only amplifier with true SO2R capability, offering 70 dB isolation between two inputs. The integrated MEffA™ algorithm dynamically adjusts DC voltage for optimal efficiency. Additional features include fast SWR protection, advanced thermal management, and seamless integration with FlexRadio systems via SmartSDR. They also support third-party radios through Ethernet, RS232, CI-V, and BCD interfaces.
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$5,999.00
4O3A RS3000 2x2 Reversible Coaxial Crossover RF Switches
4O3A RS3000 2x2 Reversible Coaxial Crossover RF Switches are high-power, 2x2 coaxial crossover switch designed to instantly swap antennas and amplifiers between two radios—ideal for SO2R, Multi-Single (MS), or Multi-Two (M/2) contest configurations. With the push of a button, operators can dynamically reassign the best antenna and amplifier setup to the radio that needs it most—perfect for chasing multipliers or breaking pileups when the in-band station needs more firepower. The RS3000 simplifies station automation by allowing seamless reconfiguration of RF paths without physically rewiring. It supports local control or remote switching via the optional RS3000 Controller (sold separately), which includes PTT interlock logic to prevent switching during transmission—ensuring safe and interference-free operation.
Not Yet Reviewed
$379.99
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$389.99
4O3A Rotator Genius Magnetic Azimuth Sensors
4O3A Rotator Genius Magnetic Azimuth Sensors are calibrated, highly accurate, magnetic azimuth sensors (i.e. a magnetic compass) designed to provide precise antenna direction feedback for Amateur Radio rotator systems. They deliver azimuth readings with ±1° accuracy and connect via standard CAT5e Ethernet cable. While it's intended to work with the Rotator Genius controller, they can also be used as a standalone solution for azimuth readout when paired with a compatible RS485-to-USB or RS232 converter (sold separately) and paired with the downloadable AzimuthReader Microsoft Windows application. Housed in a waterproof enclosure, these sensors are ideal for boom-mounted installations and eliminate the need for traditional pulse or potentiometer-based sensors, offering a reliable and maintenance-free alternative.
Not Yet Reviewed
$126.99
4O3A 1A2R Radio Switches
The 4O3A 1A2R Radio Switch is engineered to allow a single amplifier to be safely shared between two radios, making it an ideal solution for SO2R (Single Operator Two Radios) contesting or multi-radio station setups. It uses a "first PTT wins" logic, ensuring that only one radio can access the amplifier at a time, preventing signal conflicts and potential equipment damage. Each radio's PTT control can be independently disabled via a dedicated switch, offering added flexibility during operation. Once installed, the switch eliminates the need for manual rewiring—your amplifier remains permanently connected and ready. In the event of a failure during SO2R operation, the amplifier can be quickly reassigned from Radio B to Radio A, providing a reliable backup path.
Not Yet Reviewed
$515.99
Special Offer
4O3A Tuner Genius XL 1X3 Antenna Tuners
4O3A Tuner Genius XL 1X3 Antenna Tuners are high-performance, fully automatic antenna tuners designed to meet the demands of serious Amateur Radio operators. Covering a wide frequency range from 1.8 to 54MHz, they can match antennas up to 10:1 SWR and handle up to 2,000W. Built to commercial-grade standards, the TGXL is ideal for contesting, DXing, and high-duty-cycle digital modes. TGXL integrates seamlessly with FlexRadio's 6000 and 8000 series transceivers and the Power Genius XL, while also supporting a wide range of third-party radios via LAN, RS232, CI-V, and more. With intuitive control via the front panel or Windows software, the TGXL offers unmatched flexibility and performance in a compact, rack-mountable design.
Not Yet Reviewed
$2,199.00
4O3A MC-1 Boom Mic
4O3A MC-1 Boom Mic (O3A-4O-NC-MC-1) -Versatile affordable plug-in condenser boom mic with universal 3.5mm mic and headphone cables -Works for all transceivers (with optional adapters) and plugs into laptops, tablets and PC -Superior vocal clarity with a wide, flat frequency response -Includes soft case, 3.5mm to 6.35mm adapter and two boom mic windscreens. Note: The MC-1 does not come as a part of the NC-1 headset and is sold separately. 4O3A MC-1 Boom Mic Specifications: Dimension: 3.819 in. x 1.850 in. (Φ9.7±0.2x4.7±0.2(H)mm) Sensitivity: -38±3DB (0dB=1V/Pa,1kHz) Directivity: Omnidirectional Impedance 2.2kΩ S/N: 60dB> Standard Power: 4.5V Operating Voltage: 1 – 10 VDC (sensitivity reduction -3dB at 1.5V) Max input sound: 110dB SPL Current Consumption: Max.0.5mA
Not Yet Reviewed
$71.99
4O3A AB Switch Relay
The 4O3A AB Switch Relay is a high isolation A/B switch, needed for some applications such as extension of an antenna matrix. The most common use case is routing the antenna between two existing high isolation antenna switches, so the isolation of this A/B Relay isn't quite as high as the RS3000 or 1A2R. Additional isolation is realized by grounding of the unused port. AB switch is powered by 13-15V through a dedicated power connector. It has an LED to indicate "out B" status. When powered off the input is routed to out A. AB Switch Relay Specifications: Port-to-port isolation at 30MHz: 56db to 70 dB (On/Off status) RF Power Handling (max.): 4000W Connectors: 3 x SO-239 (O3A-4O-AB-PL) Power: 12V DC @ 120mA Power Indication: LED diode Dimensions, WHD: 3.35 x 5.31 x 2.76 in. (85 x 135 x 70 mm) Weight: 0.22 lbs. (0.1 kg)
Not Yet Reviewed
$181.99
4O3A USB to RS-485 Adapters
4O3A USB to RS-485 Adapters are a compact, level converter designed to convert USB serial data into a bipolar RS-485 signal, enabling long-distance communication thanks to its symmetrical signal levels. Commonly used to connect the Rotator Genius magnetic compass to a PC for calibration or sensor data retrieval, this adapter is powered directly via USB and requires no external power supply.
Not Yet Reviewed
$29.99
4O3A QPXC-8 Triplexer Extenders
4O3A QPXC-8 Triplexer Extenders are designed to meet the needs of large station setups, with flexibility as a core feature. Instead of using a fixed quadriplexers with four band-specific outputs, the QPXC-8 functions as an extension to the existing triplexer system, allowing for more versatile signal routing. It is compatible with both 4O3A filters and filters from other manufacturers.
Not Yet Reviewed
$909.99
4O3A NC-1 Noise Canceling Bluetooth Headphones
4O3A NC-1 Noise Canceling Bluetooth Headphones (O3A-4O-NC-HP) feature an amazing range of capabilities: - Crystal Clear Sound — 40mm neodymium drivers ensure the highest quality sound, allowing you to hear even the slightest detail, whether in a contest or while listening to music. The frequency response is flat with a slight boost in the bass area for maximum enjoyment. - Excellent Ambient Noise Canceling — The NC-1 Headphone noise canceling system is top of the line. Using a two microphone system, this is one of the best available on the market. With up to 25dB of noise reduction, experience real silence for the first time in your life! - Bluetooth 5.0 for Android and Apple mobile devices, laptops, tablets, PC and interfaced radios. Even though it's not an essential contesting feature, 4O3A includes the latest Bluetooth 5.0 chipset for listening comfort and mobility. More often than not the modern gadgets lack an Aux connector. . - Long life 750mA rechargeable Li-Ion battery -Includes a zipper case, USB A to USB C charge cable and an extra pair of ear cushions. Note: The MC-1 Boom Mic is an option that is sold separately.
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$305.89
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$321.99
4O3A 8xAB Antenna Switches
4O3A 8xAB Antenna Switches integrate eight independent A/B switches into a single compact unit, enabling seamless switching between multiple antennas and radios. When paired with two 403A Antenna Genius switches (O3A-40-AG8X2 or O3A-40-AG8X2-N), it forms a powerful 8×4 antenna matrix, allowing up to eight antennas to be routed to four radios with exceptional isolation. Built with the needs of high-power stations in mind, the 8xAB Switch delivers robust performance, intuitive operation, and a clean, maintainable installation. The primary motivation behind the 8xAB switch is the integration of two Antenna Genius smart switches into an 8×4 Super Switch.
Not Yet Reviewed
$698.39
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$775.99
4O3A RS3000 Reversible Switch Controllers
4O3A RS3000 Reversible Switch Controllers are designed to improve the safety and efficiency of the RS3000 2x2 Reversible Coaxial Crossover Switch system. They ensure switching between radios and antennas only occurs when neither connected radio is transmitting, preventing accidental switching if one user begins transmitting while the other is still on the air. This makes it ideal for SO2R (Single Operator, Two Radios), MS (Multi-Single), or M2 (Multi-Two) contest configurations. These switch controllers operate on 13–15VDC input. A 3-pin DC output (5.08 mm pin header) connects to the RS3000 Crossover Switch. Before use, connect the PTT lines from both radios to the controller's RCA jacks. The controller connects to the RS3000 switch via the +12V/GND terminals. If a user attempts to switch while the other is transmitting, the controller delays the switch until the PTT line is inactive. During this delay, the "Wait" LED is illuminated. This ensures safe switching regardless of transmission frequency.
Not Yet Reviewed
$149.99
4O3A S8 Antenna Genius Manual Controllers
4O3A S8 Antenna Genius Manual Controllers are designed to be used with the Antenna Genius, Antenna Switch 8x2, and Power Splitter PS3000RX when no band data or control signal is available from the transceiver or PC, requiring manual switching. It enables manual antenna selection for Antenna Genius, is required for operating the 8x2 switch without a computer or band decoder, and supports manual control of the PS3000RX splitter. For PS3000RX use, the S8 can be modified with a diode matrix to allow selection of single antennas or phased combinations. The controller connects via a 15-pin cable. When used with Antenna Genius, it is powered through pins 9–10. For third-party devices, a 13–15VDC power supply is required (not included).
Not Yet Reviewed
$59.99
4O3A Bluetooth Dongles for NC-1 Headphones and Headsets
4O3A Bluetooth Dongles for NC-1 Headphones and Headsets are offered for those who use a PC that does not have Bluetooth capability. These USB Bluetooth 5.0+ dongles support high resolution audio listening, volume and track selection as well as voice communications for radio, mobile and portable devices and computers. Many laptops and PCs already have Bluetooth built-in, some do not, and some have an old Bluetooth adapter that is incompatible. In order to properly support all of the NC-1 Bluetooth 5.0 capability, here are two optional USB dongles for virtually any situation: O3A-4O-BTNC1 for standard use within the same room. O3A-4O-BTNC1R for "Plug & Play 100M" long range use, this model includes an external antenna (not shown in image). NOTE: A USB Bluetooth dongle is not supplied with NC-1 Headsets or NC-HP Headphones.
Not Yet Reviewed
$20.99
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$31.99