hammag-05-2010

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HAM-MAG
May2010
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amateurradioandSchool
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InernationalHAMMagazine­
100%HAMRADIO
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SSWWRRTTeesstteerr
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PPOOSSTTIITT!! 33
5500MMHHzz­­DDXXNNeewwss 3333
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ThehistoryofTorreBert 42
DDXXNNEEWWSS 2266
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[
HAM­MAGN.16
May2010]
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ASunwithnosunspots!ThequietSunreturned
­­
throughThursday,April22,therehavebeeneightdaysstraightwithnosunspots.
AnewspotbegantoemergeonWednesday,butitquicklyfaded.Forthenext10daysNOAA/USAF
predictsolarfluxat78,78,80,80,80,78,76,80,80and80.Solarfluxvaluesabove80aren’t
predicteduntilMay20­23,withavalueof85,butthatistoofarintothefuturetopredictaccurately.
Theyalsopredictthereturnofsunspotgroup1061onApril23­25;thatsunspotgroupwaspreviously
visibleonApril5­10.
SunspotnumbersforApril15­21were0,0,0,0,0,0and0,withameanof0.The10.7cmfluxwas
74.5,74.8,73.9,74.7,75.4,75.6and76.1,withameanof75.TheestimatedplanetaryAindiceswere
8,4,2,2,5,5and6,withameanof4.6.Theestimatedmid­latitudeAindiceswere5,2,1,1,3,4and
4,withameanof2.9.PlanetaryAindexforApril23­May2ispredictedtobe8,6,5,5,5,8,8,5,5and
5.GeophysicalInstitutePraguepredictsquiettounsettledconditionsforApril23,thenquietApril24­
26,quiettounsettledApril27andbacktoquietforApril28­29.
CSSannouncesDigitalDesktop/SCforIcomRadios
MuscleShoals,AL,April19th2010:CreativeServicesSoftwareannouncedtodaythathamscanpre­
ordertheDigitalDesktopSoundcardreleaseforIcomRadio.
TheprogramtakesadvantageofthebuiltinsoundcardandCI­VinterfaceviatheUSBportontheback
oftheIC­7200andIC­7600.SincetheseradiossupporttheTX/RXcommandsinCI­Vinterface,only
onecableisneededfordigitalmodes,theUSBcable.OtherIcomsthatsupporttheTX/RXcommands
willonlyneedthesoundcardinterfacedtothem,andthoseIcomsthatdon’thaveasoundcardor
TX/RXcommandscanstillusetheprogramwithasoundcardinterfacetotheircomputer.
TheIcomradiosthatsupporttheTX/RXandsoundcardintheradioare:
IC­7200andIC­7600.
IcomradiosthatsupporttheTX/RXcommandsbutwillneedaexternal
soundcardare:
IC­703,IC­746(original),IC­746Pro,IC­756Pro,IC­756ProII,IC­756ProIII,IC­7000,IC­7700and
theIC­7800.
ModeslikeRTTY,PSK­31andSSTVareincludedwiththeproductandtheplansaretoinclude
Winmorinafuturerelease,andmoremodeswillbeaddedviathesnap­indlltechnologycreatedby
ErikGawtry,KC0WWC,ofTimewaveTechnology.Thisopensourceinterfaceallowsanyonetocreate
justthemodemportionofadigitalmodeandbyputtingtheDLLinthefolderoftheprogramandthe
modeappearsonthedropdownlist.CompanyPresidentRickRuhl,W4PC,said,“AttheOrlando
Hamcation,wefoundoutthatonlyCSSsupportedtheTX/RXcommandsintheIcomradios.TheCSS
staffdecidedtocomeoutwithaversionoftheDigitalDesktopfortheIcomRadios.Whiletheywon’tbe
abletogettheARQmodeslikePactor,AmtororG­TorwithoutaTNC,butwillbeabletousetheir
radiosinthenonARQmodeswiththesoftware.
whichisasavingsof$5offtheretailpriceof$39.95.Whentheproductisreleased,thosewhohave
purchasedthepreviewwillhavetheoptiontodownloadtheprogramorhaveitsenttothemonCD(or
[
HAM­MAGN.16
May2010]
B
B
y
yGerd,DM2CDB
TotestSWRinstrumentsandindicatorsofFT817orofNWTIhaveinventedasimplecircuitme,which
allowsyoutosetanSWR1through3.Theprecisionresistorcanbeingbothlargerandsmallerthanthe
standardvalueof50ohms,becausetheSWRvalueallowsnouniquemappingthemeasuredvalue.
Thedevelopmentwastosolvethemeasurementfunctionwithasfewcostlyperformanceprecision
resistors.OfcourseyoucancreatearesistivesSWR,capacitiveorinductivecomponentsarenot
included.
Cantheusedresistorsbewithoutmajorerrorsabout500MHz.Howbigistheinfluenceofwiringonthe
accuracy,mustbeongoing,ifappropriateinstrumentsareavailable.
SWR­Testerwasbuiltperformanceprecisionresistorswith1%100Wof25Ohms,50Ohmsand100
Ohms.
MaximummeasurableRFperformancestronglydependsontheusedheatsinkthermalresistance.
WithoutcoolingQRP­aremeasurementsupto3.5Wpossible.
ThefigureshowsthecircuitofSWRtesters.
Whowantstousetheoppositionasadummyload,shouldturnparalleltoasecondRFconnectoras
measuringoutputtotheRFinputjackandpositionSWR=1measureperformance.
73fromGerd,DM2CDB
[
HAM­MAGN.16
May2010]
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QuickandEasyCurrentLimitedEmergency
BatteryCharger
ByArtLoya­KJ4NIR
Aquickandeasyemergencybatterychargerusedtochargeleadacidorgel­celltypebatteriesfrom
120vACcanbequitehandy.Ihaveusedthiscircuitmanytimeschargemy12V­7ASLAbatteryIuse
withmyYaesuFT­857dradiountilIfinallygotaroundtobuyingasmallBatteryTendercharger.
Cautions:
Thisisasimpleunregulatedcharger,itcanandwilloverchargeyourbatteriesifleftunattended.
Thiscircuitusesdangerous120vACandnormalcautionsmustbeadheredtopreventelectrical
shocks.Theadvantagesofthiscurrentlimitingcircuitarethatitcanchargeaboutanyvoltageof
battery,Ihavecharged6,9,and12v.Itcanalsoassistinpreventingsulfationinthebatteryand
rejuvenateolderbatteries.
Materialsused
:
• 120v60wLightBulbandinexpensive($1.29@AceHardware)porcelain
lampholder
• 1n4004SiliconDiode,
• 16awgwireungroundedACPlug
• Redandblackalligatorclips
Circuit
:
120v60wbulbisactingasacurrentlimitingdeviceconnectedinserieswiththediode.
Thediode’spositive(+)sideisconnecttobulbandnegative(­)sideisconnectedtothebattery’s
positive(+)terminal,thebattery’snegative(­)terminalisconnectedtothe120vACreturn.Sincethisisa
currentlimiteddesignabatteryofanyvoltagecanbechargewithupto1/3A.Evenwithashorted
battery,themaximumcurrentflowisapproximately1/3A.ThepulsatingDCcurrentwillhelpbreakup
sulfationthatmaybepresentinthebatteryandcanpossiblyrejuvenateanolderweakor“neardead”
battery.
Wiringitup
:
• Connectplugtowire,Iusedadiscardedlampcodewithtwoprongplugattached
• AttachedBLACKalligatorcliptooneendofthelampcard,thiswillbeattachedtonegative(­)
terminalofbatterytobecharged
• Connectoneendoflampcordtoonesideporcelainlampbase
• Connectpositive(­)sideof1n4004diodetooppositesideofporcelainlampbase
• Attachwiretonegative(­)sideofdiode
• AttachREDalligatorcliptowirefromdiode,thiswillconnecttothepositive(+)terminalofthe
batterytobecharged
• usingelectricaltapewrapdiodeandanyexposedconnections
Usingthecharger
:
Notethatthelampisdimmerthannormal.Thediodeallowsthelamptolightat50%dutycycle.
Monitorthetricklecharging,thiscircuitisunregulatedanditcanoverchargeyourbatteries.
73's!Art
[
HAM­MAGN.16
May2010]
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