1965 Series 50 Ohm Coaxial Surge Protector INSTALLATION INSTRUCTIONS Technical Data 5.3 (.209) 41.0 (1.61) 3.3 (0.13) 4.5 DIA. (.177) 46 (1.81) DIMENSIONS: 57.0 (2.24) MM (INCHES) 1. When the Model 1965 arrester is used for protection of radio transmitter equipment, first review that the proper arrester model (voltage rating) has been selected. The radio transmission power, frequency, and system VSWR (including VSWR contribution of the arrester) are the variables that must be identified. Refer to Graph 1 - Protector Selection. ∅ How to Order Part No. ......................................................Description 1965-xx-A00 ...............................................N(f) and N(f) 1965-xx-A01 ...............................................N(f) and N(m) 1965-xx-A04 ...............................................BNC(f) and BNC(f) 1965-xx-A05 ...............................................BNC(f) and BNC(m) 1965-xx-A12 ...............................................UHF(f) and UHF(f) xx = DC Sparkover (x10 V) (f) = female (m) = male 2. The arrester should be located as close as practical to the equipment being protected; typically less than 3 m (10 ft.). Single-point grounding, as shown in the following schematic, will improve the overall protection if the arrester is to be located at some distance from the equipment. T/R EQUIP. N 1965 4 mm POWER GROUND conductor to the earthing system should be 4 mm (AWG 6) or larger and not exceed 3 m in length. If the protector is not mounted to a well-grounded bus, then the grounding conductor should be connected directly to the ground screw terminal on the arrester ground plate. 3. The arrester is symmetrical and bidirectional and may be oriented in either direction – either end may be used for the input or the output. 4. The arrester ground plate should be secured directly to an earth-grounded bus or mounting surface. The grounding Graph 1 - PROTECTOR SELECTION Graph 2 - FREQUENCY CHARACTERISTICS 10 2 8 6 4 1965-60 1965-50 1965-35 2 1965-20 2 4 6 8 10 5 1.00 VSWR 1.02 1.04 .050 1.06 .075 INSERTION LOSS .100 1.08 .125 1.10 .150 1.12 .175 1.14 VSWR 10 3 Insertion Loss (-dB) Power (Watts) 0 .025 1.16 .200 0 100 200 300 400 500 600 700 800 900 1000 Frequency (MHz) 10 6 107 108 10 9 Frequency (Hz) NOTE: Radio frequency and transmit power must be known. The above curves apply to systems with a VSWR equal to or less than 1.2:1. Choose the protector whose curve lies first above the power-frequency coordinates of the radio system. For systems with a VSWR in excess of 1.2:1 (and for a more exact determination, If desired), multiply the actual radio power by the expression: 0.83[2xVSWR+(1+VSWR)]² Use this new power value to enter the graph. Specifications are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications. Asia-Pacific: Tel: +886-2 2562-4117 Fax: +886-2 2562-4116 Europe: Tel: +41-41 768 5555 Fax: +41-41 768 5510 The Americas: Tel: +1-951 781-5500 Fax: +1-951 781-5700 www.bourns.com 10/13 Specifications are subject to change without notice. The device characteristics and parameters in this data sheet can and do vary in different applications and actual device performance may vary over time. Users should verify actual device performance in their specific applications.