DATA SHEET 58538A and 58539A Lightning Arrestors for GPS Systems Lightning can damage GPS system Antenna system components, such as line components and receiving equipment, even amplifiers, will also be protected if located Key Features without a direct hit. This can result in costly between the antenna and the arrestor. 58538A repairs and critical interruption of service. Protection of receiving equipment is • Small, waterproof unit for installation The 58538A Lightning Arrestor and 58539A discussed in the following paragraph. in a grounding panel where the antenna cable enters the building GPS L1 Lightning Arrestor are designed to Protect Receiving Equipment with a • Protects receiving equipment only work in conjunction with a lowresistance, (must be used in conjunction with the Recommended or Economical Configuration low-inductance ground to protect your 58539A) In systems with short in-building cable GPS receiver and elements of the antenna 58539A lengths (<4 m), a single 58539A installed system from lightning discharges and field- where the antenna cable enters the • Larger package for installation in a induced electrical surges. grounding panel where the antenna building is sufficient to protect downstream cable enters the building, or close Symmetricom 58538A equipment. Systems with long in-building to the GPS antenna The 58538A is a small, waterproof unit cables need one 58539A at the entrance • Protects antenna system components designed to operate in the communications to the building and one near the receiver. and receiving equipment band up to 2.5 GHz, and to take much of This diverts to ground any voltages the energy out of a nearby lightning strike. induced in the in-building cable by the Key Benefits This unit is typically installed in a grounding electromagnetic fields generated by the 58538A panel where the antenna cable enters the lightning strike. For a more cost-effective • Reduces the energy of a nearby lightning strike when used in the building. The 58538A will protect receiving solution, the 58538A can replace the communications band up to 2.5GHz equipment only, and must be used in 58539A at the building entrance, as long • Flexible configuration to suit your conjunction with the 58539A. as an 58539A is placed near the equipment. system requirements Symmetricom 58539A Protect Both Antenna and Equipment 58539A The 58539A is a larger package optimized Your GPS system can be configured • Reduces the energy of a nearby lightning strike when used in the for use in the GPS L1 frequency range. to protect the antenna and nearby GPS L1 frequency range It will reduce the energy from a nearby components as well as receiving • Flexible configuration to suit your lightning strike to a level where it will not equipment. Such systems require one system requirements harm either antenna system components 58539A installed properly near the antenna. or receiving equipment. The 58539A may A second 58539A (or 58538A, as needed) be used alone or with the 58538A, as is required at the cable entrance into the described in the following paragraphs. building to protect downstream equipment. Finally, a third 58539A should be placed Protect Antenna and Nearby near receiving equipment if the in-building Components Only cable run is greater than 4 meters. When placed close to the GPS antenna, the 58539A will protect the antenna from surge voltages and currents that can be induced in the antenna cable by lightning. Page 1 of 2 DATA SHEET 58538A - 58539A Low Maintenance Cost due to Replaceable 58538A Specifications 58539A Specifications Surge Arrestor Capsule . . . . Frequency range GPS L1 (1,565 to 1,586 MHz) ELECTRICAL SPECIFICATIONS . . Both the 58538A and the 58539A have . . . . Impendance 50 Ω (typical) Frequency range DC –2.5 GHz . . integrated gas-filled surge arrestor . . . . Impedance 50 Ω (typical) VSWR ≤ 1.2 . . capsules. During lightning strikes, the . . . . Insertion loss ≤ 0.5 dB (typical) VSWR ≤ 1.2 . . capsules can direct a single 40 kA current . . . . Surge pulse resistivity 25 kA (8/20 μs current pulse) Insertion loss ≤ 0.2 dB (typical) . . . . impulse or multiple 20 kA impulses to . . Surge pulse resistivity 25 kA (8/20 μs current pulse) Residual pulse amplitude < 40 V . . . . ground without being destroyed. Periodic . . Max. bypass voltage 15 V Residual pulse amplitude < 900 V . . . . replacement of the capsules ensures that . . Max. bypass current 1 A . . . . PHYSICAL SPECIFICATIONS . . the arrestors are performing at their best. DC bypass resistance < 1 Ω . . . . Connectors 2 type-N jacks . . There are many other products with gas- . . . . Weight 136 g PHYSICAL SPECIFICATIONS . . capsule technology which do not have . . . . Connectors 2 type-N jacks Dimensions 68.3 mm L X 26 mm W . . . . replaceable capsules. This makes periodic . . Weight 449 g Panel thickness (Note 1) 10 mm . . . . maintenance expensive because the whole . . Dimensions 115 mm L X 128.5 mm W X . . . . ENVIRONMENTAL SPECIFICATIONS arrestor must be exchanged. Replacement 34.5 mm H . . . . . . Operating temperature –40°C to +100°C capsules are offered as 0960-1297. . . Grounding terminal M6, recommended wire size: . . . . 16 mm2 Waterproof IP 66 (according to IEC 529) . . . . . . Option 002: 16 mm2 stranded wire cable Corrosion Saltspray test according to Durable and Easy to Install . . . . 300 mm length wire lugs at . MIL-STD-202, Method 101, . The 58538A and 58539A are designed for . . . . both cable ends Condition B . . . . easy installation in either indoor or outdoor . . . . . . ENVIRONMENTAL SPECIFICATIONS MATERIAL DATA locations. Both arrestors are waterproof . . . . . . Body Operating temperature –40°C to +85°C and corrosion resistant, and both feature . . . . Material Brass, annealed . . Waterproof IP 66 (according to IEC 529) . . sturdy Type-N connectors. The 58538A can . . Surface Treatment Tri-Metallization Plating . . Corrosion Saltspray test according to . . be mounted directly into a grounding panel. . . (See Note 2) MIL-STD-202, Method 101, . . . . The 58539A has builtin mounting holes for . . Condition B Soft copper washer . . . . Material Tellurium copper . . mounting to a flat surface. 58539-60602 is MATERIAL DATA . . . . Surface Treatment Nickel . . provides a low-resistance, low-inductance, Housing . . . . Insulators . . Material Aluminum Alloy 300-mm grounding cable to the 58539A. . . . . Material PTFE . . Surface Treatment Chromatized, powder-coat Longer cables may not provide proper . . . . Contact pins & sockets RAL 7035 (gray-white) . . . . grounding due to increased resistance Material Beryllium copper hardened, . . Connector bodies, outer body . . . . HV 350 and inductance. . . Material Brass, annealed . . . Surface Treatment Gold plated, MIL-G-45204 . . . Surface Treatment Tri-Metallization Plating . . Type II, Class 2 . . . (See Note 2) . . . . . . Gasket . . . 58538A Lightning Arrestor Dimensions Insulators . . . . Material Silicone rubber . . . . Material PTFE . . . . . . Contact pins & sockets . . Material Beryllium copper hardened, . . . HV 350 . . . Surface Treatment Gold plated, MIL-G-45204 . . Type II, Class 2 . . . Gaskets . . Material Silicone rubber . . . . . . Notes: . . . . 1. Panel thickness refers to the thickness of the bulkhead . . grounding panel, should the arrestor be secured to . . one. . . . . . . 2. The plating material Tri-Metallization Plating is a cop- 58539A GPS L1 Lightning . . . . per alloy composed of three components: copper, tin, . Arrestor Dimensions . . . and zinc. Tri-Metallization Plating complies . . . with the requirements of MIL-C-3902 and CECC 22120. . . Withstands saltspray test IEC68-2-11. . . . . . . ELECTRICAL SPECIFICATIONS . . . . . . . . . 2300 Orchard Parkway © 2012 Symmetricom. Symmetricom and the Symmetricom logo are registered trademarks San Jose, California 95131-1017 of Symmetricom, Inc. All specifications subject to change without notice. tel: 408.433.0910 fax: 408.428.7896 www.symmetricom.com DS/58538A_58539A/022312 900-00395-000 A