Putting a single surge protector behind a splitter or multicoupler, in case of a high energy event the coupler will protect the surge protector by blowing up first. Are Preselectors Useful For MW Listening. surge current. Many tests have been done, dating back to 1968, that prove the Ufer is a safe and effective way of augmenting a ground system. You want as short, direct, straight connection to ground as you can get, preferably using flat braid or a flat metal strip. Turn on voltage is a nominal 600V. Since all towers have some inductance, leaving the tower at a point above ground will allow some of the strike current to continue on the coax line (both the center conductor and shield) toward your equipment. It doesnt hurt to have the rods too close, it only costs more in material and labor. PolyPhaser coaxial radio frequency surge protector products are commonly used for radio and antenna installations where part or all equipment is outdoors system to protect sensitive equipment and are specially designed to pass the desired frequency while suppressing DC surge. Aluminum, as used in PolyPhasers coaxial protectors, has an excellent corrosion resistance due to a 1 nano-meter thick barrier of oxide film that instantaneously forms on the metal. Copper strap has lower inductance per unit length and more surface area in contact with conductive soil than the equivalent amount of copper in a circular conductor. The grounding of the plate or panel is very important. These installation instructions assume that the user is already familiar with the installation instructions and physical layout of the MIM 2-Wire, MIM LINK, LDI, SDI, or ICI products. to a product via email. Related Media 433721_433721_POL.pdf 433721_POL.pdf Technical Specs Trimble recommends P/N 187642 - Polyphaser DGXZ + 15NFNF-A. To protect the Ethernet port from power surges and RF noise, ensure that you use a Shielded RJ45 cable: The Alloy chassis needs to be grounded. Check for other paths such as existing building lightning rods with down conductors or large electrical conduits. Depending on the amount of rainfall, doping the ground system radials with 4 pounds of salt per linear foot and 20 pounds per rod may last approximately two years. Whenever DC power needs to be inserted into an AC signal to power remote antenna amplifiers or other devices, a Bias-T connector is required. To build the largest and most complete Amateur Radio community site on the Internet - a "portal" that hams think of as the first place to go for information, to exchange ideas, and be part of whats happening with ham radio on the Internet. Thusly you really should put your surge protectors as close to where the coax comes into your house as you can, and one antenna per protector. The recommended grounding method is by connecting a grounded wire to a mounting screw and mounting rail. Benefits: Protects your equipment: The PolyPhaser 098-1013G-A provides exceptional surge protection, helping to keep your critical electronic equipment safe from lightning strikes . In either case, high quality protectors will dump the energy into the ground system. DC block protectors find their ideal use in applications where DC is not required on the coaxial cable such as SCADA, two-way radio, cellular, DGM, DCMA and UMTS. The tower and coax cables would have a combined inductance of approximately 15uH assuming that the cables ran from top of the tower to the grade level ground. Notes: Buy Now: https://www.streakwave.com/polyphaserBuy Now: https://www.streakwave.com/transtector PolyPhaser says its new fiber enclosure product line is designed to make field installation as simple as possible. Antenna Support: Notes: i am looking at Polyphaser for an RF surge protector. Notice:Much of the lightning protection discussion pertains to RF grounding also. Customer must apply PolyPhaser's Weather Proofing Kit (Part Number: WK-1) to seal the unit and cable connections. Another gas tube or gap may be added closer to the antenna tuner. For HF I've been using gas tube lightning arrestors from Alpha Delta and for VHF/UHF and up Polyphaser. Selecting and Installing Lightning Protection Devices The primary goal in any lightning protection system is to control the massive energy generated during a lightning strike so it will dissipate before it can enter our homes. Three Techniques: Every conductor has measurable inductance. The directly applied or induced voltages on the center conductor would roll off and arrive after the shield pulse, producing large differential voltages between shield and center conductor.
Lightning protection by Polyphaser - Chiburban Radio Mobileers DC Block Filters and Arrestors iok:mqUhFqU:t(fFsg;)g8k9Q(M|&CkR^dCg} MaU1am\9ycR {i For the following discussion, a 2us by 18kA negative strike pulse will be considered. Control and Coax Line Protection: This project involves a management team of volunteers who each take a topic of interest and manage it with passion. Surge Protection Devices and NEC Code 2020 The latest NEC 2020 Sections detail the requirement of surge protection devices (SPDs) in specific applications. Although the lightning strike is dc, due to the fast rise time to peak current, there is significant RF energy. 8 PB-M INSTALLATION SHEET . $155.99 Add to Cart POLYPHASER's VHF50HN 100 - 512 MHz VHF combiner bulkhead protector. While some ground systems last 30 years, others dont even last two years! With three copper straps the voltage would be even lower. Use lag screws or other type fastners, as may be dictated by the type of wall material, for . PolyPhaser Straight Gastube with aluminum body, DC to 7 GHz, N-F on surge side, N-F on protector side. The next thing to measure is distance. I installed the best protection Polyphaser has, and have not had any problems (thank God) since. If the coil cant handle the energy (half the coax surge energy is on the center pin), the coil will open up and the current will translate to a large open voltage source capable of arcing anywhere within the radio.
POLYPHASER Lp-poet Su Lightning Arrestor Poe Surge Protector It may be difficult to calculate the voltages present at the gas tube and it will change when switching bands. 9.231kV. Since the IS-50 and IS-B50 are the most widely used PolyPhaser RF protector series, application in Land Mobile Radio, SCADA systems, amateur radio and many others, this paper focuses on their specific testing condition. This added inductance of the coax line will buffer the energy entering your equipment area. The proper way is to use an earth resistance meter providing a fall of potential type test. Single point grounding should be easy to do if the equipment is mounted inside a metal enclosure. Since lightning has a large portion of its energy in the LF range, it will behave like an RF signal. Since the strap is flat, its susceptibility to magnetic fields is only towards its edges. stream Solder (60/40) will not hold up to sunlight and ozone without protection. The basement is the best location for the ham shack. PolyPhaser provides a technologically advanced solution designed to overcome the inherent weaknesses associated with gas tube and quarter-wave technology. This will leave exposed steel that will continue to pit and may even de-alloy. The single point ground plate should also be oriented with its flat side parallel to the tower for the same reason. mount/ground a PolyPhaser coaxial protector facilitating cable installation. Copper strapping is preferred over large diameter wire as an inter-connecting media. See QST, Aug, 2003, P 39; Optimum Radial Ground Systems. There are two ways of finding out if your ground system is in need of work. Copper as a metal is a good electrical conductor, only moderately attacked by ground and air borne acids, and should have a life span measured in years. Even for conductors buried in the ground, try to prevent sharp bends. The straps extra surface area reduces the inductance and the sharp edges allow for a high E field concentration forcing more charge into the soil. Non-replaceable elements. If the soil is not normal (e.g., very dry or sandy), the separation may be reduced in order to minimize the interconnect inductance. The recommended grounding method is by connecting a grounded wire to a mounting screw and mounting rail. Contact the site with comments or questions. Have used Polyphasers for many years at commercial sites. If you have a antenna tuner fed long wire and the pole is just supporting the antenna wire, it would be a good idea to have the grounded straps extend higher to intercept a strike or to divert energy to ground if the wire is struck. Polypropylene is better than nylon to use as a full footprint sheet insulator. Ground System Materials: The TK clamp will help increase the surface area of the connection as well as provide the necessary isolation between the dissimilar metals. Others use isolation kits (0.062 [1.6 mm] phenolic insulating material and isolation grommets PolyPhaser RACK ISO-KIT) for racks that must be physically secured to the floor. The ground system, if too small in area, will cause more energy to traverse the cables and other lines to the shack. Engineered for low voltage let-through and superior RF performance, PolyPhaser's patented DC pass lightning protection devices offer superior performance to protect sensitive Tower Top Amplifiers (TTA) or active antenna systems where DC voltage is required, such as GPS, 3G-4G, WIMAX and Ret.
Grounding & Lightning Protection | DX Engineering A galvanized (hot dipped zinc) tower on a rebar reinforced concrete base is not at risk with a copper ground system. The preferable alternative is to allow all racks to rise and fall with the overhead ground system potential without any other paths to ground. The coax cable shield must not be the only interconnection between ground systems. PolyPhaser, known for its innovative, reliable, dynamic RF surge protection and filtering solutions, now offers a broad range of cables and connector caps to fit the specifics of your applications. Such currents following a round-member conductor will not make extensive use of its large cross sectional area. Most of the new old stock Polyphasers I bought cheap are rated for 125MHz to 1GHZ and not for HF, plus they don't pass DC. N Female antenna port N Female equipment port. Any particular reason why you use Alpha Delta for HF and Polyphaser for VHF/UHF ?
PolyPhaser - kf7p.com The system consists of a power supply (lightning protected of course) and a buried sacrificial anode element, such as zinc. It is a common misconception to think that a lightning strike will blow up a concrete pad. At high temperatures some copper alloys are better than stainless steel. I use Polyphasers on my job and at my home ham station. For hole cut-out dimensions, see page 4 of this guide. Outside world means any other ground outside of the lightning strikes local sphere of influence. In the above example, each of the I/O protectors is connected to separate grounding points. If during construction, all rebar in the concrete pad becomes an integral part of the ground system, the overall surge current density will be several orders of magnitude lower than the myth-perpetuating case above. The local elevated potential would seek to equalize the signal conductor through your circuitry, and use it as a path to a lower potential. Also fundamental to a good protection scheme is the creation of asingle point groundwithin the ham shack. PolyPhaser's VHF50HN-ME is coaxial rf surge protector in the surge protection modules, surge suppressors category. Protectors: To prevent coupling, the strap should be oriented with the flat side parallel to the tower (the most likely strike point and magnetic field source). endobj This is one reason why PolyPhasers N-type coax connectors are all silver with gold center pins.
Polyphaser | RadioReference.com Forums The panel is designed to mount/ground a PolyPhaser coaxial protector facilitating cable installation. Weatherized Max Surge of 20kA, VSWR 1.1:1 to 3 GHz, Insertion Loss 0.1 dB to 4 GHz. A strike to the power lines some distance away can conduct damaging energy to equipment. Magnetic Energy: %PDF-1.4 The strike energy is picked off and diverted into the ground system in a controlled way. With the surge current distributed over all of the rebar there will be little opportunity to develop the temperatures necessary to vaporize the imbedded moisture.
PolyPhaser | VHF50HN-ME - Datasheet PDF & Tech Specs PDF RF Surge Device Installation Guide - PolyPhaser
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