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Alpha Delta Communications
Alpha Delta Communications coax switches and coax surge protectors have been protecting sensitive communications gear for years. And the company’s limited space antennas...
Alpha Delta Communications coax switches and coax surge protectors have been protecting sensitive communications gear for years. And the company’s limited space antennas have survived hurricane-force winds. Why not bring that same proven Alpha Delta performance and reliability to your amateur radio setup, too? For over 30 years, Alpha Delta Communications has been a leading manufacturer of coaxial surge protectors, coaxial switches, HF fixed wire antennas, and more. We’ve got Alpha Delta coax switches, single and parallel dipoles, replacement arc plugs, surge protectors, and more. Shop DX Engineering now!
Alpha Delta Communications coax switches and coax surge protectors have been protecting sensitive communications gear for years. And the company’s limited space antennas have survived hurricane-force winds. Why not bring that same proven Alpha Delta performance and reliability to your amateur radio setup, too? For over 30 years, Alpha Delta Communications has been a leading manufacturer of coaxial surge protectors, coaxial switches, HF fixed wire antennas, and more. We’ve got Alpha Delta coax switches, single and parallel dipoles, replacement arc plugs, surge protectors, and more. Shop DX Engineering now!
Alpha Delta Coax Switches
Alpha Delta Coax Switches have a precision-machined switch shaft and quadrant mechanism for more accurate and stable switching performance. These switches have a low-loss micro-strip cavity design, positive detent switching, master antenna ground function, a front panel removable arc-plug surge protection module, and excellent HF through UHF performance. The unselected antenna ports are grounded for protection and maximum isolation. Alpha Delta Coax Switches are used worldwide in government, military, and commercial applications and are manufactured in Alpha Delta's ISO-9001 certified production facility in the USA. They come available with either a 2-port or 4-port position, and both have the option of either the UHF female (SO-239) or N female connector. These switches are all built into the same heavy-duty chassis that is 5.250 x 3.500 x 1.250 in. (WHD), excluding connectors and knob. Note: When placed in the "COM" position, all switch positions are grounded. When a port is selected, that port is ungrounded while all other ports remain grounded. Additional features include: * Higher strength, lower resistance sliver bearing solder * Durable abrasion resistance with powdercoated finish * Brass arc-plug housing for improved gas tube positioning Note: When available, please look at the files under the "Documentation" tab for additional product information. Coaxial switches have to work every time. Alpha Delta Coax Switches from DX Engineering have the quality and reliability you need!
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$119.99
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$149.99
Alpha Delta UHF Connector Coaxial Cable Surge Protectors
Alpha Delta UHF Connector Coaxial Cable Surge Protectors have SO-239 connectors and are rated for 200 or 2,000 watts at frequencies up to 500 MHz. They are not DC-blocked, so they will pass control voltages in applications requiring the coaxial cable to carry both RF and DC voltage. They may be easily mounted for the most effective grounding with a 1/4-20 bolt or stud (depending on model) in a single hole or as a bulkhead-mount through the grounding panel. In a study under the auspices of the U.S. Dept. of Energy, utilizing the satellite FORTE launched in 1997 carrying VHF lightning discharge sensors, it was determined that there can be damaging lightning energy emissions throughout the 30 through 300 MHz VHF spectrum. Before FORTE, it was thought that most lightning energy emissions were primarily in the VLF range. Therefore, the damage threat can be anywhere from VLF through VHF. Through the careful design of the Alpha Delta Arc-Plug® gas tube module and precision, constant impedance through-line allowing proper firing characteristics, these devices are designed to provide effective protection throughout this entire spectrum. Other surge protector designs may only utilize simple VLF filters with no gas tube backup. Additional features include: * Excellent broadband performance from DC through 500 MHz, compared to the narrow-band DC-blocked or stub designs. * Innovative impedance compensated through-line cavity design allows control voltages to pass through the device, instead of the "wire-around" requirement of DC-blocked designs. This design allows "in-circuit" cable sweeps. * Innovative, fast-acting gas tube replaceable Arc-Plug® module can be removed and replaced in the field in about one minute with no tools required, and without having to remove the protector from the circuit. The "O" ring sealed knurled knob does the trick! * The Arc-Plug® modules and connectors are "O" ring sealed for complete weatherproofing. * Effective performance. Due to the carefully designed reactance-compensated, through-line cavity and Arc-Plug® module placement, customer and government test approvals show this design is as good as, or better than, DC-blocked designs. Lightning surges do lots of damage annually. Protect your equipment from surges with Alpha Delta UHF Connector Coaxial Cable Surge Protectors from DX Engineering!
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$69.99
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$79.99
Alpha Delta N Connector Coaxial Cable Surge Protectors
Alpha Delta N Connector Coaxial Surge Protectors are rated for 200 or 2,000 watts at frequencies up to 3 GHz. They are not DC-blocked, so they will pass control voltages in applications requiring the coaxial cable to carry both RF and DC voltage. They can be easily mounted for the most effective grounding with their 1/4-20 in. stud in a single hole or as a bulkhead through the grounding panel. In a study under the auspices of the U.S. Dept. of Energy, utilizing the satellite FORTE launched in 1997 carrying VHF lightning discharge sensors, it was determined that there can be damaging lightning energy emissions throughout the 30 through 300 MHz VHF spectrum. Before FORTE, it was thought that most lightning energy emissions were primarily in the VLF range. Therefore, the damage threat can be anywhere from VLF through VHF. Through the careful design of the Alpha Delta Arc-Plug® gas tube module and precision, constant impedance through-line allowing proper firing characteristics, these devices are designed to provide effective protection throughout this entire spectrum. Other surge protector designs may only utilize simple VLF filters with no gas tube backup. Additional features include: * Excellent broadband performance from DC through 3 GHz, compared to the narrow-band DC-blocked or stub designs. Typical dB loss: 0.1@ 1 GHz; 0.2@ 2 GHz; and 0.5@ 3 GHz. * Innovative impedance-compensated, through-line cavity design allows control voltages to pass through the devices, instead of the "wire-around" requirement of DC-blocked designs. This design allows "in-circuit" cable sweeps. * Innovative, fast-acting gas tube replaceable Arc-Plug® module can be removed and replaced in the field in about one minute with no tools required, and without having to remove the protector from the circuit. The "O" ring sealed knurled knob does the trick! * The Arc-Plug® module and connectors are "O" ring sealed for complete weatherproofing. * Effective performance. Due to the carefully designed reactance-compensated, through-line cavity and Arc-Plug® module placement, customer and government test approvals show this design is as good as, or better than, DC-blocked designs.
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$79.99
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$99.99
Alpha Delta Parallel Dipole Antennas
Alpha Delta Parallel Dipole Antennas consist of the Alpha Delta DELTA-C center insulator and end insulators, ISO-RES coils connected to the 80/40/15 meter wires, and separate wires for 20 and 10 meters. All wires are assembled to the center insulator and utilize stainless steel hardware and 12-gauge solid copper wire. These antennas are shipped fully assembled, except for threading the 20 and 10 meter wires through the parallel wire element spacers. These are inserted during the antenna final assembly and installation process. * Model DX-EE covers 40, 20, 15 and 10 meters * Model DX-CC covers 80, 40, 20, 15 and 10 meters * Model DX-LBPLUS covers 160, 80, 40, 20, 15 and 10 meters Overall length for the DX-CC is 82 ft., 100 ft. for the DX-LBPLUS, and the DX-EE is only 40 ft. in length overall. An antenna tuner is required for 15 meter operations on each of these antennas. Alpha Delta Parallel Dipole Antennas provide lots of bang for your buck! Order from DX Engineering!
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$195.99
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$245.99
Alpha Delta Desktop Coax Switches
Alpha Delta Desktop Coax Switches bring a new level of versatility and convenience to your station operation! They come in a desktop console that will sit right next to your equipment on your desk without having to be secured or bolted down. These switches retain all of the features and specifications of the precision 4-position Alpha Delta series, including D-4 arc-plug module surge protection. Alpha Delta desktop coax switches feature non-slip feet, a powder coated steel housing and a solid brass ground bus. The ground bus provides three 10 AWG wire attachment points with wing nuts across the rear of the housing, providing a common ground point for all station equipment and accessories. Available with either a UHF female (SO-239) or N female connector, Alpha Delta Desktop Coax Switches will have you connected and running in no time. Additional features include: * Port-to-port isolation: greater than 60 dB at 30 MHz, 50 dB at 450 MHz * Power rating: 1,500 watts Put coaxial switching at your fingertips! Order Alpha Delta Desktop Coax Switches from DX Engineering!
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$209.99
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$219.99
Alpha Delta Antenna Hardware Kits
Alpha Delta Antenna Hardware Kits contain one DELTA-C Center Insulator, antenna connection hardware, one model SEP arc-plug static electricity protector that is installed on the back of the DELTA-C, and two model DELTA-CIN End Insulators. These kits are a great way to build wire antennas! The antenna hardware is constructed using Alpha Delta's exclusive Model Delta-C Center Insulators and model CIN End Insulators. They're molded from Deltalloy, an extremely tough and durable plastic specifically blended to withstand sunlight and extreme weather conditions. An SO-239 connector is provided for a direct connection to the PL-259 on your coaxial cable. Or, a ladder-line balanced feedline may be connected directly to the dipole wire ends. If a balanced feedline is used with an antenna tuner in non-resonant applications, the SEP arc-plug must be removed to prevent the "false triggering" of the gas tube. The ALP-SEP arc-plug static electricity protector is a special gas tube component designed to bleed off slow-rising static electricity buildup generated by thunderstorms, high-wind driven snow, sand, or even a harmless looking cloudy day. These static charges have been measured to several thousand volts and can damage or destroy sensitive components in receivers' or transceivers' front-end circuitry. Note: When the "Documentation" tab is available, please look at the associated files for additional product information. For wire antenna kits with a little something extra, order Alpha Delta Antenna Hardware Kits from DX Engineering!
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$42.99
Alpha Delta Surge Protector Replacement Arc-Plug® Cartridges
After hundreds of protective firings of the Arc-Plug® cartridges or after a catastrophic surge, the Arc-Plug® cartridges may fail, requiring replacement. Alpha Delta Surge Protector Replacement Arc-Plug® Cartridges are designed to get you back up and running in no time. Failure will be apparent due to the fact that they fail in a shorted or "fail-safe" mode, so as not to leave the equipment unprotected. Simply unscrew the failed Arc-Plug® cartridge by gripping the knurled surface and turning counter-clockwise. Make sure that the new Arc-Plug® Cartridge O-ring is fully seated into the body of the surge protector and you're back on the air! Protect your gear with renewable surge protection. Order Alpha Delta Surge Protector Replacement Arc-Plug® Cartridges and your Alpha Delta surge protectors from DX Engineering!
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$15.99
Alpha Delta End Insulators
Alpha Delta End Insulators are fabricated with an extremely rugged UV and RF-resistant Deltalloy material that is so tough, you can drop it off a roof without damage. The annular rings provide an extra-long leakage path to withstand voltages developed from very high power.
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$4.99
Alpha Delta Single Band Full Size Dipole Antennas
Alpha Delta Single-Band Full Size Dipole Antennas are pre-assembled half-wave monoband dipole antennas. They are pre-tuned for the lowest indicated frequency and come with the correct amount of mounting rope. These antennas may be tuned for any frequency by shortening the wire lengths according to the supplied instructions. Cut their DX-80 for 60 meters, their DX-40 for 30 meters, and their DX-20 for 17, 15, 12 or 10 meters. They are constructed with a Delta-C Center Insulator with built-in SEP static electricity protectors and are fully assembled using stainless steel hardware, 12-gauge PVC-insulated high-strength solid copper wire, and DELTA-CIN End Insulators. Their center insulators feature SO-239 (UHF female) connectors to accept the PL-259 on your coaxial cables. These antennas will easily handle full legal power. For quality monoband dipoles you can depend on, order Alpha Delta Single-Band Full Size Dipole Antennas from DX Engineering!
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$90.99
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$119.99
Alpha Delta Single Wire Multi-Band Dipole Antennas
Alpha Delta Single Wire Multi-Band Dipole Antennas consist of the Alpha Delta DELTA-C Center Insulator, end insulators, and an ISO-RES coil connected to the 80/40 meter wires. The wires are attached to the center insulator. These antennas are shipped fully assembled and ready to install. They utilize stainless steel hardware and 12-gauge solid copper wires. Their overall length is 82 ft. for the DX-DD and 100 ft. for the DX-LB Plus. Due to their Hi-Q construction, bandwidth on 80 meters is 65 to 70 kHz. A wide range antenna tuner is required for greater frequency coverage on 80 meters. These are a great value in multi-band dipoles for the lower frequencies. Order Alpha Delta Single Wire Multi-Band Dipole Antennas from DX Engineering and hit the airwaves!
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$179.99
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$209.99
Alpha Delta Coaxial Switch Replacement Arc-Plugs®
Alpha Delta Coaxial Switch Replacement Arc-Plugs® are designed to reduce the hazards of lightning-induced or other high-voltage induced surges. When hit with a surge, they will short to ground, protecting your equipment, and will remain shorted and must be removed or replaced in order to continue operation. As with all lightning protection; these surge plugs will not prevent fire or damage caused by a direct lightning strike to an antenna, power lines, or other structure. Alpha Delta D4 Coaxial Switch Replacement Arc-Plugs® are direct replacements for Alpha Delta Coaxial Switch model Delta-2 and Delta-4 series switches. As when used in Alpha Delta Coaxial Switches, D4 Replacement Arc-Plugs® are rated at 1,500 watts CW and SSB PEP, ICAS, at an SWR under 2:1. Lightning surges do lots of damage annually. Don't let your sensitive Amateur Radio gear go unprotected. Order Alpha Delta Coaxial Switch Replacement Arc-Plugs® from DX Engineering!
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$14.00
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$21.99
Alpha Delta F Connector Coaxial Cable Surge Protectors
Alpha Delta F Connector Coaxial Surge Protectors are rated for 200 or 2,000 watts at frequencies up to 3 GHz. They are not DC-blocked, so they will pass control and power voltages in applications requiring the coaxial cable to carry both RF and DC voltage. They can be easily mounted for the most effective grounding with their 1/4-20 in. stud in a single hole, or as a bulkhead through the grounding panel. In a study under the auspices of the U.S. Dept. of Energy, utilizing the satellite FORTE launched in 1997 carrying VHF lightning discharge sensors, it was determined that there can be damaging lightning energy emissions throughout the 30 through 300 MHz VHF spectrum. Before FORTE, it was thought that most lightning energy emissions were primarily in the VLF range. Therefore, the damage threat can be anywhere from VLF through VHF. Through the careful design of the Alpha Delta Arc-Plug® gas tube module and precision, constant impedance through-line allowing proper firing characteristics, these devices are designed to provide effective protection throughout this entire spectrum. Other surge protector designs may only utilize simple VLF filters with no gas tube backup. Additional features include: * Excellent broadband performance from DC through 3 GHz, compared to the narrow-band DC-blocked or stub designs. Typical dB loss: 0.1@ 1 GHz; 0.2@ 2 GHz; and 0.5@ 3 GHz. * Innovative impedance-compensated, through-line cavity design allows control voltages to pass through the devices, instead of the "wire-around" requirement of DC-blocked designs. This design allows "in-circuit" cable sweeps. * Innovative, fast-acting gas tube replaceable Arc-Plug® module can be removed and replaced in the field in about one minute with no tools required, and without having to remove the protector from the circuit. The "O" ring sealed knurled knob does the trick! * The Arc-Plug® module and connectors are "O" ring sealed for complete weatherproofing. * Effective performance. Due to the carefully designed reactance-compensated, through-line cavity and Arc-Plug® module placement, customer and government test approvals show that this design is as good as, or better than, DC-blocked designs. Lightning surges do lots of damage annually. Protect your equipment from surges with Alpha Delta F Connector Coaxial Surge Protectors from DX Engineering!
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$79.99
Alpha Delta HF SWL Sloper Antennas
Alpha Delta HF SWL Sloper Antennas are a very unique and very effective adaptation of existing antenna theory. They operate as quarter wave slopers, which means that the wires are one quarter wavelength long; or multiples of a quarter-wave on each frequency band. These SWL Sloper Antennas are designed to cover: Medium Wave (0.5 to 1.6 MHz) and the 120, 90, 60, 49, 41, 31, 25, 21, 19, 16 and 13 meter SWL shortwave bands. Compared to a standard half wave dipole, the other quarter wave of these antennas, which is necessary for performance and the proper feed point impedance, is made up of the "Down-Lead" wire, which is attached. With a quarter wave sloper, the center conductor of the coax is attached to the radiating wires and the shield of the coax is attached to the down lead. Standard SO-239 (UHF female) connectors are provided on the ALP-DX-SWL for this purpose. Excellent performance is attained with installations of only 20 to 40 ft. in height. Historically, and by design, quarter wave sloper antennas are known to be excellent DX and long haul antennas. The current lobes, which define the major radiation characteristics of an antenna, are up high at the feed point and are not as subject to attenuation as a vertical antenna, whose current lobe is at ground level. At an Alpha Delta location, side by side comparisons between the ALP-DX-SWL and a 32 ft. commercial vertical with 18 radials show the DX-SWLs to be as much as 10 dB stronger into Europe and Africa. Since a sloper has an optimized low-angle radiation pattern for peak DX performance, it will greatly outperform a dipole mounted at the same height. Exceptional for those really distant weak signal DX stations! The difference can be phenomenal. HF sloper antennas come fully assembled and use stainless steel hardware, UV-protected coils and components, and 12 AWG wire. They are designed to survive severe-weather environments. Insulators and support rope are included. SWLs chase the rare ones with Alpha Delta HF SWL Sloper Antennas from DX Engineering!
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$169.99
Alpha Delta SEP Arc-Plug® Static Electricity Protectors
Alpha Delta SEP Arc-Plug® Static Electricity Protectors are mounted in the DELTA-C Center Insulator and bleed off slow-rising static electricity charges by routing them harmlessly to ground, before they can enter the shack through the feedline. This method is far more effective than DC-grounded baluns or chokes, which can be "popped" by static charges. Dangerous static charges are developed from thunderstorms, high-wind driven snow, or desert sand. The static electricity generated by these forces has been measured to thousands of volts. They're so potent; they can puncture the dielectric of unterminated coax. Alpha Delta SEP Arc-Plug® units are OEM replacements for the protectors located in the back of DELTA-C Center Insulators and are easily replaced by carefully removing the #10 stainless steel hardware used to attach the ends of the antenna wires. Please note the assembly order of your washers, lock washers, wires, nuts, and carefully re-assemble them in the same order after replacing the static electricity protector cartridge. Keep antenna-produced static electricity out of your receiver or transceiver. Order Alpha Delta SEP Arc-Plug® Static Electricity Protectors from DX Engineering and keep a few on hand!
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$19.99
Alpha Delta Model LT Coaxial Surge Protectors
Alpha Delta Model LT Coaxial Surge Protectors provide lightning surge protection for transceivers on frequencies from DC up to 30 megahertz. Each unit features SO-239 UHF female connectors on both input and output. Every spring and summer, many pieces of amateur radio equipment are damaged beyond repair by lightning-induced voltage surges. An inexpensive investment in these Alpha Delta Model LT Coaxial Surge Protectors may be your best insurance to protect expensive HF equipment from destructive surge voltages! Don't sit by and allow surge damage. Order Alpha Delta Model LT Coaxial Surge Protectors from DX Engineering to put a damper on those surges!
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$39.99
Alpha Delta Twin Sloper Antennas
Alpha Delta Twin Sloper Antennas combine the tremendous DX firepower of the quarter wave sloper with the wide bandwidth of the half wave dipole. These model DX-A twin slopers are designed to cover 160, 80 and 40 meters. One leg is 67 ft. long, while the other is 60 ft. long. The sloper antennas install like an inverted-V with ground return accomplished through the tower or down-lead. These antennas utilize stainless steel hardware, 12-gauge solid copper wire, and efficient Alpha Delta "Iso-Res" RF choke coils. Twin sloper antennas are designed for use on an un-guyed metal tower with a beam on top. The beam provides a capacity hat effect and helps to tune the twin slopers. NOTE: It is possible that the introduction of the sloper antennas into a tower system employing multiple guy wires or other attached wire antennas may cause a slight detuning of the sloper antennas. Other installation types will require the use of an outboard wide-range antenna tuner. Time-proven antennas are always good values. Order Alpha Delta Twin Sloper Antennas from DX Engineering and enjoy some vintage wire antenna performance!
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$154.99
Alpha Delta Parallel Wire Sloper Antennas
Alpha Delta Parallel Wire Sloper Antennas are designed for limited-space installations that don't allow for the DX-A twin sloper antennas. These antennas have a 50 ohm coax feed and are rated for full legal power. They are designed to use your tower or other antenna support structure. Requiring only 60 ft. of overall length, they provide amazing DX performance at installation heights of only 35 ft. at the high end and 8 ft. at the low end. These antennas are pre-assembled and pre-tuned for an easy installation. DX-B sloper antennas cover 160, 80, 40 and 30 meters. The "top wire" covers 160, 80 and 40 meters. The parallel "underslung" wire covers 30 meters and may be removed or trimmed to 20 meters if desired. Parallel sloper antennas utilize stainless steel hardware, 12-gauge solid copper wire, and efficient Alpha Delta "Iso-Res" RF choke coils. To gain the same broadband performance as the DX-As, the DX-Bs are also designed to be used with a wide-range antenna tuner, so no trimming or tweaking is necessary. Here's an efficient and compact antenna for 160, 80, 40 and 30 or 20 meters. Order your Alpha Delta Parallel Wire Sloper Antennas from DX Engineering!
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$159.99
Alpha Delta Parallel SWL Dipole Antennas
Alpha Delta Parallel SWL Dipole Antennas cover AM broadcast through 30 MHz. They provide efficient, low-noise, broadband performance for medium wave, tropical, international SW, military, government, embassy, maritime, aircraft, commercial, and utility frequencies. They feature ISO-RES inductors, parallel wire elements, and the exclusive DELTA-C center insulator with the built-in ARC-PLUG static electricity protector. The antennas utilize stainless steel hardware and 12-gauge solid copper wires. Their overall length is 80 ft. and they may be installed as dipole, inverted-vee, or full sloper antennas. These antennas can also be used with an antenna tuner as transmit antennas. Their connectors will accept either coaxial cable or balanced line and the antennas come fully assembled and ready for installation.
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$209.99