specifications surgeprotectorsgi: brand: Polyphaser mpn: Lp-poet type: Surge Protector upc: 888063827730 Seller surgeprotectorsgi: city: Lake Worth, Florida zipcode: 33467 Payments surgeprotectorsgi: PayPal Offer surgeprotectorsgi: quantity: 2 Since the coaxial cable shield is connected to the ground bar via the ground kit, 9.2kV would be present on the shield and will be conducted directly to the antenna connector on your equipment rack. The TK clamp will help increase the surface area of the connection as well as provide the necessary isolation between the dissimilar metals. When the ground system is saturated, the energy is actually coming from the (utility) ground system and can go through your TV, for example, in an effort to leave the area by way of the cable TV drop. It should be capable of doing this very quickly (fast transient response). This may not be a sufficiently low inductance path and it will radiate to other wires/equipment inside the house. i am looking at Polyphaser for an RF surge protector. Bulkhead mount with bracket for grounding or mounting. Consider using a PolyPhaser TK series stainless steel clamp. Another alternative is to install an active cathodic protection system. PDF RF Surge Device Installation Sheet - PolyPhaser MRLK Installation Instructions - Rain Bird The power supply will electrically elevate the tower section or anchor (negative) forcing galvanic currents through the sacrificial zinc anode (positive) element. Since copper strap has lower inductance than wire, it is recommended for the radial run. Make sure the box is grounded, as well as the inside mounting plate. The significance of being more noble means any other metal buried and connected to your copper ground system will be more anodetic and thus become sacrificial. Plain and simple. The ground system, if too small in area, will cause more energy to traverse the cables and other lines to the shack. This is assuming that the RF ground plane is in the ground. To successfully implement a Ufer ground system it is necessary to bond each of the independent pieces of rebar together. The phone connection at the street was blown apart and the lid blown 95 feet from the underground connection. An aluminum roof after 30-years only had 0.076mm (0.003 inch) average pitting depth. The next step in a good protection scheme is to provide a single point ground, a plate where all of your equipment l/O protectors can be located. Reviews Other Info Shipping Polyphaser GT-NFF-AL DC Pass Gastube Protector DC-7000 MHz with 80 VDC Pass Voltage. Go to: http://home1.gte.net/res0958z/ to see my installation. The better the ground system, the more current flows through the tower leg into the Ufer ground. Solder connections, even torched silver solder connections will not last as long as the above. Pay attention to the frequency coverage for each one. PolyPhaser IS-50UX-C0. However, a few poorly implemented occurrences can give a valuable technique a bad reputation. The more the strike energy is divided, the less there is to go to your equipment. Dusty 25 yr old garage stored Diamond D-130 antennas still usable? Lightning protection by Polyphaser - Chiburban Radio Mobileers Our definition of a high rise building is different than the upper stories of a house. The conduit should be grounded to the tower base ground point. This will maintain all chassis at the same potential during the strike event and minimize chassis-to-chassis current flow. Two typical PolyPhaser protectors for Amateur Radio usebelow 1 GHz are shown in Figure 7. 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. An old timer once told me that he tested a ground by disconnecting it from everything and connecting it to power hot through a 30 amp fuse. These ports are usually the ac power connection, a telephone or control line, and an antenna transmission line. 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 offers a series of data and Telco protectors when a higher level of protection is required. By spreading electrons out over a wide area with a fast transient response ground system, the ground potential rise (step potential) for any smaller given area would be reduced. Since a moderately high tower is much more likely to be struck than any other nearby structure, the placement of the tower with respect to your equipment deserves significant consideration. The sharp corners of equipment cabinets can breakdown the air, causing current to flow. The ground system can absorb only so much energy before it becomes saturated. I have even used the NEMP rated protectors on a government facility that had it's communications center in a giant Faraday cage in a bunker. The preferable alternative is to allow all racks to rise and fall with the overhead ground system potential without any other paths to ground. PolyPhaser - VHF Combiner Arrestor, N/F to N/F - Tessco High pressure clamps provide a meshing of copper to copper since the material is soft (malleable). Copper strap radials have been proven successful on bare mountain top solar powered sites where ground rods could not be used. Since the surface area interface between the J-bolts and the concrete is small, and the surge current density from the strike very large, the corresponding heat generated by the energy transfer can turn the concrete moisture into steam and possibly crack the pad. This gives some percentage of improvement but it still must interconnect to conductive soil where it has both salts and moisture. (See Lightning Overview and Coaxial RF Protectors for a more detailed discussion) That means the energy will only mostly conducted on the skin of the conductor (skin effect). If the area is not large enough, the earth connection will suffer. In 1990, several towers were lost in Minnesota alone due to guy anchor corrosion and failure. Since stainless wire will be required to interconnect the rods, the resistance of the system will increase. Another is to provide some form of impulse protector for each of the equipments Input or Output (I/O) ports. 1) Entrance panel is installed on the exterior side of the equipment shelter. PolyPhaser's DC blocked products are designed to pass RF frequencies and effectively block all DC, while providing industry's best RF performance. The coax cable shield must not be the only interconnection between ground systems. If this is not done, the energy from the tower strike will traverse the house safety ground wires to this rod, causing problems. Even though the inductive properties of the coax cable appear to be beneficial, and extra inductance can be created by adding a few turns to the coax; dont do it. Once in the ground, the inductance of a bare conductor is shunted by the earth's conductivity. An electrical cable lost only 0.109mm (0.0043 inch) after 51-years of service near Hartford, Connecticut. The cable company installed protector is usually just a grounding block earthing only the outside shield and does nothing to the center conductor energy that can have as much energy as the outside shield! Also, a strike to the tower or building can produce a local ground potential rise with damage to your equipment from energy attempting to escape to the outside world through the ac secondary conductors. 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). For existing towers, look at the ratio of surface areas and ground resistance. Antenna Support: By being underground, the shielding effect to the wires is not great. Similarly, ground conductors exhibit normal inductance before they go below grade. It may be difficult to calculate the voltages present at the gas tube and it will change when switching bands. 9.231kV. The most popular compounds use either zinc oxide or copper particles embedded in silicone grease. 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. The Alloy receiver needs the following parts and areas to be grounded to prevent, or limit, the damage sustained from electrical surges and lightning strikes: Trimble recommends installing lightning and surge protection equipment to protect GNSS receivers on all permanent sites as follows: Install lightning protection for the GNSS antenna coaxial input. 3) Ground Radials: The low inductance ground connection is provided by multiple 6 inch [152.4 mm] wide copper straps attached with a sandwich bar to the 0.125 inch [3.2 mm] thick solid half-hard copper bulkhead. Secondary ac power conductors are a two way street for electrons. Stay away from gels and other chemicals that can shorten conductor life. Where the connection is with galvanized steel, the zinc coating will be reduced allowing the base steel to oxidize (rust), which in turn will increase the resistance of the connection and eventually compromise the integrity of the mechanical structure. SUR-VHF5-0HN PolyPhaser [] Ground Potential Rise (GPR). A strike to the power lines some distance away can conduct damaging energy to equipment. Although the lightning strike is dc, due to the fast rise time to peak current, there is significant RF energy. (See the Noble Metal Table for a ranking of commonly used metals.). Stainless hardware may be used. Further corrosion reduction of the rebar, due to galvanic action, will be limited by this oxide layer. Since concrete is a conductor, your equipment must not sit directly on the concrete. Not inexpensive, but the cost of rebuilding from a direct hit wouldn't be either. Bends sharper than 8-inch [203.2 mm] radius will add unwanted inductance to the desired ground path. Tower Considerations: Only conductive towers or metal poles should be used for mounting antennas. Installation hardware installation instructions. The phone box on the house side was blown off the house (we have underground utilities.) No one should consider using a non-conductive structure for an antenna support. This is recommended only if all of the l/O protectors are mounted on the panel and the ground connection is directly to the panel and not to any other piece of equipment. Copyright 2023 Wesco International. It doesnt hurt to have the rods too close, it only costs more in material and labor. Radials do have a limit on their effective length. Connect the Polyphaser body to earth ground per the Polyphaser installation instructions. -bd-]. The basement is the best location for the ham shack. Normal self supported and guyed towers will not need such jumpers. The most cost effective spacing between rods for normal (grassy) soil is two times the length of a rod into the ground. Third, the transmitter equipment chassis must be insulated from conductive flooring and connected to the ground plane using a low inductive connector. Use a A lightning ground system should be capable of dispersing large amounts of electrons from a strike over a wide area with minimum ground potential rise. And there's NO substitute for using the proper protective equipment. They make an excellent line of products for amateur use. Related Media 433721_433721_POL.pdf 433721_POL.pdf Technical Specs The magnetic fields will also be divided and could, in theory, cancel in the middle of the building. Second, the individual l/O protectors need to be co-located on the same electrical ground plane. The use of a joint compound is the recommended means for joining our coaxial protectors to our bulkhead panels for non-climate controlled installations. This is the accelerated corrosion (loss) of the least noble metal (anode) while protecting the more noble (cathode) metal. PolyPhaser's Earthed Entry Panels are an all-copper coaxial solutions for your grounding needs. Some high rise buildings have a fire riser with a straight run to the basement where a super charger pump is usually connected. Buy Now: https://www.streakwave.com/polyphaserBuy Now: https://www.streakwave.com/transtector I have 5 Alphe Delta switches with no problems. The panel is best located near the ground to keep the inductance of the ground conductor low. The use of joint compounds further enhances the weather tightness of the bond. If they cannot spread out in a reasonable time frame, the back up pressure (voltage) will find or create another path. It has 5/16" holes arranged to coincide with standard 16" on-center studs. A protector on each of the l/Os will protect that path from damage. PolyPhaser provides a technologically advanced solution designed to overcome the inherent weaknesses associated with gas tube and quarter-wave technology. The local elevated potential would seek to equalize the signal conductor through your circuitry, and use it as a path to a lower potential. 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. I use Polyphasers on my job and at my home ham station. Depending on ground conductivity, harmonic and other currents, there could be current flow causing a spark when connected. The safety ground can be fixed by adding a distribution panel and protector at the single point ground location or, for small sites, a plug-in protector grounded on the single point ground panel. Polyphaser - eHam.net The large surface area of the shield, the correspondingly low inductance of the coax line, and the proximity of the coax to the tower present the fast rise time lightning current pulse with an ideal path towards the equipment. When these two parallel inductors to ground are combined (3.9uH and 2.7uH), the lower section of tower has an inductance of 1.6uH. 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. The aluminum will pit to the copper leaving less surface area for contact. A complicating factor is that the other l/O protectors are at a distance with respect to the equipment. The recommended grounding method is by connecting a grounded wire to a mounting screw and mounting rail. Document Number PEN1031:How to ground the coaxial cable shields as they enter the equipment building. 8 PB-M INSTALLATION SHEET . Lightning has a large magnetic field associated with its typical high current pulse. How you direct the energy is the difference. The reason to interconnect them in the ground using bare conductors was to reduce the inductance of the interconnecting path. They are usually large low inductance conductors. Protectors:Passive Intermodulation produces signals at unwanted frequencies that can interfere with RF signal reception. In some locations it may be necessary to utilize all three of these techniques for the best results. This could elevate the equipment cabinets to deadly voltages, deadly for both people and components. When lightning strikes, a tremendous rush of electrons move down the tower and out into the ground/radial system. A Ufer ground should not be used alone. PolyPhaser coaxial RF surge protector (also known as lightning surge protector, lightning surge arrestor or suppressor) GT-NFM-AL is in-stock and will ship same-day as purchased. The site will be something of which everyone involved can be proud to say they were a part. 15 0 obj A PolyPhaser bulkhead entrance panel provides all of the necessary attributes required above. Any insulated signal lines are subject to damage as is the source power supply. Well, The "smoke" finally got out of one of mine. Also fundamental to a good protection scheme is the creation of asingle point groundwithin the ham shack. The magnetic shielding is less than the basement and the inductance to ground is higher than the basement. The Alpha Delta and most other gas tube types will easily pass 12V DC for the active antenna. Grounding both the antenna and the single point ground connection in the equipment room is easy for buildings with structural steel frames just bond to the building steel. PolyPhaser's VHF50HN-ME is coaxial rf surge protector in the surge protection modules, surge suppressors category. A ground mounted vertical antenna is very similar to a ground mounted tower. The telephone line is also protected and grounded where it enters the building. Never a problem. When you consider the cost of underground utilities, these and the aesthetics must be weighed. Satellite dishes will also have the same problem. 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. The antennas on a high rise are not on a ground mounted tower, but are usually attached to the building structure. In the real world, most coax lines do not run all the way to the bottom of the tower; but usually leave the tower at a convenient height to make an entrance near the ceiling of the equipment room. It is one of the most widely used metals for atmospheric exposure. With eHam.net Reviews subscriptions, you can receive all messages posted Most metals today are not perfectly pure and consequently, when exposed to the environment, will begin to exhibit some of effects of corrosion. Bulkhead mount with bracket for grounding or mounting. This interconnection should be below grade and with a bare low inductance conductor. For dipole antennas with baluns, use the same gas tube technique. Polyphaser Company and their line of lightning protection products is well known in commercial and amateur radio circles. One is to totally disconnect the equipment! PolyPhaser & Transtector Webinar - Lightning and Surge - YouTube High Rise Buildings: i am looking at Polyphaser for an RF surge protector. The Infinite Electronics international DC block (PolyPhaser IS-B50 / IS-50) and other GDT based surge arrestors can be field tested to qualify whether they are working or not working. The high pressure will need to come from another material stronger than copper. The earth immediately surrounding the ground point will begin to take up the energy charge and dissipate the energy by propagation within its sphere of influence (see ground systems topic). The dc blocking ensures the operation of the protector regardless of the input circuitry of the equipment. If you find a rock layer is making the ground rod insertion difficult and you cant remove the rod to start over a few feet away, the best idea is to cut off the rod and connect it to the system. Handles 50 kA max. 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. Read on! 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 can be summed up simply: You have control of the lightning strike energy and not Mother Nature. Proper guy wire and anchor grounding is essential under these (or any) circumstances. This makes the currents smaller than a ground system using concentric rings or a ground grid. Image #3 shows a typical surface mounting option for the IS-B50. Copper and other metals are attacked by acids, while aluminum is attacked by bases. Last Reviewed: 1/7/03. If the outside (tower/perimeter) ground has a low impedance at lightning frequencies, most of the strike energy will be dispersed into the ground and little energy will enter the shack. Because the anchors are located away from the tower base, at least some of the strike energy will traverse the inductive guy wire to the ground. Throwing the coax out the window is not a solution, especially if the coax has already entered the house from the antenna or the antenna is roof mounted without a ground path. Since the tower is a conductor and is well grounded, all of the coax lines should be grounded (using a grounding kit) at the top of the tower close to the antenna and at the base of the tower before they come toward your equipment. 2017 Critical Communication Networks Brochure, 2017 Signal and Surge Protection Solutions Brochure, Security Cameras CATV GPS Satellite Protection, Testing RF Lightning Protectors without Indicators, 2017 Mission Critical Systems, Reliable Performance Solutions for Rail Transportation Networks. Dont stop short of a good ground plane. The strap edges helped disperse the strikes deposited charge to the tower by arcing onto the mountain surface, saving the solar powered radio equipment at the site. The buried ground system radials, used with ground rods to further disperse the strike energy, are also bonded to the rebar. The easiest single point will be at the power and telephone entrance. !C@{-|vEi-c^Z PrN{ zpx8'N,gK+f?xYq\ d;"q%lZQYOwY7*v6^Xx Enough said. Whether using standard patented lightning protection or customized solutions, PolyPhasers name is globally synonymous with high-quality and superior performance. During a strike event, the energy will propagate along a conductive path (power line, transmission line, or telephone line) until it meets the protector. They even hooked me up with a local Florida Power 3 day symposia on lightning protection for facility managers! The protector will shunt the majority of the strike energy to the earth ground. The current density for a given current will be greater for material with a smaller surface area. Non-replaceable elements. 6 0 obj endobj iok:mqUhFqU:t(fFsg;)g8k9Q(M|&CkR^dCg} MaU1am\9ycR {i I installed the best protection Polyphaser has, and have not had any problems (thank God) since. Our recommendation is to protect these lines at the tower base then run them in EMT (electrical metal tubing) steel conduit. The EMT will act as a faraday shield from the towers magnetic fields and will minimize the amount of induced energy. For the following discussion, a 2us by 18kA negative strike pulse will be considered. Even if abraded, it will reform and protect the metal from any further corrosion. If a PolyPhaser Entrance Bulkhead with its two 6 inch [152.4 mm] copper straps were used in the previous example, the inductance path would be lowered to 2.7uH, and the voltage at the entrance bulkhead would be reduced to 5670 volts. MODULAR BULKHEAD PANEL ASSEMBLY GUIDE . If few natural ions are available, salts, such as Epsom salts, can be added to the soil to increase the conductivity. 1) Conductor Surface Area: Benefits: Protects your equipment: The PolyPhaser 098-1013G-A provides exceptional surge protection, helping to keep your critical electronic equipment safe from lightning strikes . Recommended installation where cables enter the building housing SM1610-4 or SM1680 systems, where power is required to pass through the antenna cable to the LNA. The strength of a magnetic field diminishes at the rate of one over the distance squared. Show more I even ran RTTY at 1500 watts. eHam.net provides recognition and enjoyment to the people who use, contribute, and build the site. Copper should never touch galvanized material directly without proper joint protection. Thus, the surge current will only ride on the outermost surface of the conductor. Polyphaser GT-NFF-AL Coax Lightning Protector DC-7 GHz - RSP Supply
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