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HA8DU DU4000AL Automatic Antenna Tuners
HA8DU DU4000AL Automatic Antenna Tuners offer advanced automation and display features that are truly unique for a 4kW HF antenna tuner, making this unit the modern-day station command center for automatic band, antenna, and memorized tuning selections. An intuitive 5-color, 5 in. touch screen provides complete control, status, and metering functionality for all station operations, including frequency readout, Forward and Reverse Power and SWR, multiple electronically variable Capacitors "TUNE", and an electronic 11- position Inductor "SWITCH" selector. The DU4000AL also features complete tuning memorization of four rear panel antenna ports as well as direct voltage control of an External 8-port Antenna Switch and Stack Match Switching. It interfaces with all types of Amateur transceivers, with the capability to use an RS-232 interface in-line between specific Yaesu, Kenwood, or Elecraft transceivers and the PC. Or, use this tuner's direct Icom "Remote" CI-V input while connecting the transceiver to the PC by USB. To top it off, the DU4000AL can be operated remotely over the Internet via LAN-Ethernet, supported by a Windows application. The DU4000AL is an automatic memory tuner that you initially program for each antenna and every applicable band segment. Subsequent operations on any preprogrammed frequency range, detected continuously by the transceiver interface, will automatically switch to the correct antenna switch position and tuning values, without transmitting, within 1 to 1.5 seconds, making this tuner truly contest- and DX-ready. The bar has been set very high for the competition. The last tuner you will ever need is the HA8DU DU400AL. Specifications of the HA8DU DU4000AL: * Frequency: 1.8 to 30 MHz * RF Input Impedance: 50 ohm * RF Input Power: 4 kW maximum at antenna SWR below 3:1 * RF Input Required: 50 watt minimum to 150 watt maximum during tuning * Programmed Retuning Time: 1 to 1.5 seconds maximum * Width: 13.386 in. (340mm) * Depth: 18.504 in. (470mm) * Height: 6.102 in. (155mm) Menu Settings: * CAT * Antenna Switch * Display * Network * Clear User Settings--Current Band * Clear User Setting--All Bands * Antenna Autoset--On/Off * Blower Set--Temperature, PTT, or Always On
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$5,329.99
Momobeam Tetra14-SF 40/20/15/10-Meter Separately Fed Yagi Antennas
Momobeam Tetra14-SF 40/20/15/10-Meter Separately Fed Yagi Antennas represent a new generation of compact, high performance HF solutions for contesters, DXers, and multi operator stations. These antennas are designed to eliminate the long standing challenges created by towers crowded with multiple closely spaced monoband arrays. In many installations, such configurations cause unavoidable interaction between antennas, resulting in distorted radiation patterns and degraded performance. The Tetra14 SF overcomes these issues through an innovative separately fed architecture that delivers true multiband capability without compromise. Tetra14 SF features independent feed points for all four HF bands, allowing stations to operate four transceivers or amplifier setups simultaneously. With appropriate band pass filtering, these antennas behave as though each operator has their own monoband Yagi, while requiring only a fraction of the tower space normally consumed by stacked arrays. This approach not only reduces structural load and visual clutter but also produces cleaner patterns, stronger gain, and more predictable performance during competitive operating environments. To ensure top-tier operation on every band, these antennas use carefully optimized element spacing developed through advanced simulation. The 40 meter section employs a compact two element Reflector/Driver design incorporating end loading, a highly effective method pioneered by W6NL. This configuration retains the performance characteristics of a full size Yagi while significantly reducing element length, making installation more practical for a wide variety of tower systems. On 10, 15, and 20 meters, each antenna uses a refined four element arrangement consisting of a reflector, driven element, and two directors, delivering excellent gain and forward directivity across the higher frequency bands. Durability, ease of assembly, and station friendly construction are central to the Tetra14 SF design philosophy. These antennas utilize a strong square boom structure, with all aluminum elements and hardware components clearly labeled for efficient assembly. Every antenna includes an assembly tool, spare hardware, and a complete set of four high quality 3kW RF choke Baluns, a component other manufacturers often sell as an optional upgrade. Installation is straightforward, requiring four coax feedlines—one for each band—and a medium to heavy duty rotator. Momobeam Tetra14 SF Separately Fed 4 Band Yagi Antennas provide exceptional performance, reduced tower complexity, and true multi operator capability. They combine the advantages of monoband arrays into a single, compact, and intelligently engineered system. For contesting groups, DXpeditions, or high-demand stations seeking high performance on 10, 15, 20, and 40 meters, these antennas offer a modern and efficient solution that delivers outstanding on air results.
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$6,633.99