Electromagnetic Pulse And The Radio Amateur - Part 3 - N3UJJ
Electromagnetic Pulse and the Radio Amateur - Part 3QST October 1986, pp. 38-41Copyright 1986 by the American Radio Relay League, Inc. All rights reserved.Part 1 appears in QST August 1986, pp. 15-20, 36 (http://www.arrl.org/tis/info/pdf/88615.pdf)Part 2 appears in QST September 1986, pp. 22-26 (http://www.arrl.org/tis/info/pdf/98622.pdf)Part 3 appears in QST October 1986, pp. 38-41 (http://www.arrl.org/tis/info/pdf/108638.pdf)Part 4 appears in QST November 1986, pp. 30-34 (http://www.arrl.org/tis/info/pdf/118630.pdf)
Electromagnetic Pulse and theRadio AmateurPart 3:In Part 2, we told how the EMP transient-protectiondevices were tested individually under isolated conditions. Now,the protectors are connected to Amateur Radioequipment and retested.t.ByDennis Bodson, W4PWFActing Assistant Manager,Technology and StandardsNational Communications SystemWashington, DC 20305-2010he tests described in the previousinstallment subjected 56 selectedprotection devices to several different injection pulses th at simulated thewaveforms and energies associated withEMP and lightning discharges. Those protective devices found acceptable during thefirst test program were then connected toseveral types of radio equipment and tested for their effectiveness in a typicalAmateur Radio installation.Since there is a large number of possiblecombination s of protection devices andradi o equipment, low-cost devices wereevaluated first. If they were found unacceptable, higher-cost protection deviceswere installed and tested unti l an acceptable protection scheme was developed.After completing the testing of the low-costcommercial devices (see Table 6), severalhomemade units, assembled from previously tested components (see Table 7),were checked . This was done with an eyetoward finding a very low-cost protectiondevice that cou ld be built by the radioamateur. Six of these units will be describedin the next installment of this series.Si xteen system configuration s (seeTable 8) were tested at frequencies from 1. 8to 435 MHz . These systems included bothnew and old gear (some no longer manufactured, but available on the used-equipmentmarket), and tube-type and transistori zedradios. The equipment tested was manufactured by Drake, !COM, K enwood, Swanand Yae su.Measurements were taken of the radiosystem's performance before and after eachpulse or pulse series to compare t he radio'sTTable 6Commercial Protection Devices herJoslynGeneral ElectricPolyphaser CorpPolyphaser CorpPolyphaser CorpTilSiemensSiemensAlpha DeltaArcherDevice NameSIOV ac test boxGE MOVSIOV RF test boxSiemens UHF test boxUHF coaxial T38Q5T-.cDescriptionCoaxial line suppressorCoaxial line suppressorCoaxial line suppressorCoaxial line suppressorCoaxial line suppressorMiniature gas-tube surge protector (MSP)Metal oxide varistor (GE-MOV)Coaxial line protectorCoaxial line protectorCoaxial line protectorPlug-in power line protectorMetal oxide varistor (SIOV)Button type surge voltage protectorCoaxial line protectorThree-outlet ac power strip/protectorTable 7Homemade Transient Protection Devices TestedJoslyn UHF test boxtParts 1 and 2 appear in the Aug and Sep issuesof QST, respectively. Part 4 will appear in asubsequent issue.Part NEMPIS-NEMP-1IS-NEMP-2Model 428S14K130B1-A350Transi-Trap R-T61-2785DescriptionThree Siemens MOVs (S 14K 130) installed in an ac receptaclebox. One MOV wired from hot to ground , one from neutral toground and one between hot and neutralOne GE MOV (V36ZA80) installed across the 12-V de power linebetween hot and ground.The Siemens MOV (S14K130) installed in a metal box. The boxhad UHF connectors attached to both ends and a wireconnected between the center conductors of the twoconnectors. The MOV was connec ted to the wire on one sideand to the box on the other side.Two Sieme
ICOM IC-745 HF transceiver IC-PS35 internal power supply System 6 ICOM IC-27A 2-m mobile transceiver System 7 ICOM IC-02AT 2-m hand-held transceiver System 8 I COM IC-271 A 2-m transceiver System 9 ICOM IC-471A 430-to 450-MHz transceiver
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