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InnovAntennas DXR Series Multi-Band HF Beams
InnovAntennas DXR Series Multi-Band HF Beams have short booms with full-size elements or capacity-loaded shortened elements, all with excellent performance, making them very popular internationally. The DXR Series interlaced-element antennas, optimized by G0KSC over a long period of time, achieve the best possible balance between compact size and performance. For the DXR Series Multi-band Yagis, equal attention was paid to a very solid construction and sufficiently small component and packaging size, to keep shipping costs within reasonable limits. Click on any model listed for specific details and specifications. InnovAntennas DXR Series Multi-Band HF Beams are available exclusively from DX Engineering in North America. Important features of InnovAntennas DXR Series Multi-Band HF Beams: * No traps, matching links, or hairpins * Only one feed line for all bands * Careful selection of materials without regard to cost * Very robust construction with still manageable package size The DXR Series beams use a 1.97 x 1.97 in. (50 x 50 mm) square boom with 0.078 in. (2 mm) wall thickness. A square boom has the advantage that the elements cannot twist in the plane. On the other hand, it is slightly heavier than a round boom of the same stiffness. The DXR Yagis do not require any bracing of the boom. The longest elements are 1.378 in. (35 mm) diameter in the middle and taper relatively quickly to achieve a good compromise between weight and strength. This construction also helps to avoid constant vibration even in light winds. With these multi-band Yagis, care has been taken to ensure that there are never more than the elements of three bands nested within each other. This is because each additional element for one band can cause interference on another band. This negative effect was avoided by careful manual optimization. The result is the best possible matching over a wider band range than other antenna designs. In most cases, no tuner is necessary; the SWR minimum can be precisely set by adjusting the element lengths. Due to the robust construction and the absence of moving or electrically active components such as coils, traps, hairpins, etc., an InnovAntennas DXR beam is maintenance-free for many years. The insulators are UV-resistant and designed for a wide temperature range. The mounting hardware uses sea-water resistant stainless steel and the aluminum is type T6 6066/6082, which is also used in aviation. It is nice not to have to climb the mast every year to maintain the antenna. The DXR Series Multiband beams are designed to require only one feed line. This makes installation on a mast with a rotor very easy. And the use of modern SDR transceivers, which allow the observation of several bands at the same time, becomes really useful. The one feed line is connected directly to the solid distribution rails of the fed elements. By avoiding baluns, matching elements, traps, or hairpins for tuning, transmit power is only limited by the coaxial cable and connectors. Note: Front-to-back ratio (F/B) and SWR bandwidth data for the DXR Series will be added as it becomes available. Many models of the DXR Series are available as a "super-compact" version, on which the longest elements have been shortened with capacity hats, thus reducing their turning radius considerably. The installation of these impressive antennas is possible even where space is limited.
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$1,439.99
Palstar AT4K 2500 Watt Antenna Tuners
One of the all-time great antenna tuners, the Palstar AT4K 2500 Watt Antenna Tuners helped build the Palstar reputation for high-quality and "Built-Like-A-Tank" durability. Unwilling to rest on their laurels over the years, Palstar has added new features to the classic. The most recent addition to the AT4K is the Active Peak and Peak Hold Wattmeter, identical to that used in their PM2000A Wattmeter. The frequency-compensated, lighted, dual-movement SWR/wattmeter may be switched between 300 watt and 3,000 watt scales for peak or average power readings. Now, the selection between unbalanced or balanced output is relay switched with a front panel control on the AT4K, eliminating the need to place a jumper strap on the back panel to make the changeover. Two coaxial and one bypass unbalanced output are handled by the extra heavy-duty ceramic 6-position 7 kV 10 Ampere RF switch assembly. The AT4K surpasses antiquated unbalanced tuners that were built with a 4:1 balun at the OUTPUT of the matching network. In those tuners, the balun was exposed to a wide range of impedance and reactance that it was never designed to handle. The AT4K T-matching network utilizes a 1:1 unbalanced-to-balanced transformer in the INPUT of the network. When the network is properly tuned, an impedance of 50 ohms is presented to the input and output of the balun, which allows it to properly perform its important transformation job. Palstar AT4K 2500 Watt Antenna Tuner features: --Power rating of 2,500 watts single tone continuous --T match circuit with impedance matching range 8 ohms to 2,000 ohms --Custom large value variable capacitors, 460pF at 6 kV --10 Ampere silver plated ceramic body roller inductor crank, handle-driven --11 ga. (.090 in. thick), iridite-treated aluminum chassis, with durable powder coating on front panel and top cover Note: For additional information, please look at the files under the "Documentation" tab. Palstar AT4K 2500 Watt Antenna Tuners are some of the best manually operated impedance matching networks available! Order your "Built-Like-A-Tank" Palstar AT4K tuner today from DX Engineering!
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$1,395.99