Diamond Antenna CP-725H User manual

40m,15m,10mand6m(7/21/28-29and50MHz)Four-bandVerticalAntenna
CP-725H
・Description
①TheCP-725Hisafour-bandvertical
antennaforHFband.
②Compact,lightweightedandveryeasy
toassemble.
③Itiscompletelyself-supportedand
doesnotneedanyguywires.
④Trapradialscouldbeconcentratedon
onedirectioninsteadofspreading
themaroundtheantenna.Thisis
especiallyconvenientiftheantennais
installedonbalconyrailingorwindow
sideofcondominiumsandurban
apartments.
⑤SincetheantennaisdirectDCground
atthefeedpoint,coaxialcableand
transceiverarebeingprotectedfrom
thehighvoltagecausedbylighting.
⑥Centerfrequenciesoftheantennaare
adjustableineachbandsimplybychange
thelengthofeachradialelement.
⑦Toploadingstructureutilizingcapacitive
hatenablestheantennatocomplete
withfullquarterwavelengthantennas
initsperformance.
⑧Itisrigidandruggedenoughtowithstand
thewindpressureover100MPH.
⑨Mastbracketsareaadjustabletoaccept
11/5”to21/3”diametermast.
⑩Feedpointsectioniskeptwaterproof
bycoveringitwithsupportpipe.
⑪10mFMbandcompatible.
・PartsDescription
OperationInstructions
（Fig1）
PipeNo.1φ15
M27005
InternaltoothlockwasherM4
M27019
TappingscrewM4x8
M27018
Doubleelement
trapcoilassembly
M27006
InternaltoothlockwasherM4
M27019
TappingscrewM4x8
M27018
PipeNo.230φ
M27007
SpringwasherM6
M27017
Hexheadscrew
M6x8 
M27016
15m(21MHz)radialelement
trapcoilassembly
M27011
Mastbracketset
M27001
Radialnut
40m(7MHz)radialelement
trapcoilassembly
M27012
Mastsupportpipe
M27002
Radialelementholder
M27003
6m(50MHz)radialelement
trapcoilassembly
M27009
10m(28-29MHz)radial
elementtrapcoilassembly
M27010
Radialelement
M27013
Feedpoint
assembly
M27004
Hexheadscrew
M6x8
M27016
SpringwasherM6
M27017
Capacityhatassembly
M27008
Capacityhat
fastenerring
M27020
Radialelementfastenerring
M27014
V-boltwithnut
M27021
8cm
・PartsDescription
Parts#Description  Qty
M27001Mastbracketset  2
M27002Mastsupportpipe  1
M27003Radialelementholder 1
M27004Feedpointassembly  1
M27005PipeNo.1φ15  1
M27006Doubleelementtrapcoil
 assembly   1
M27007PipeNo.230φ  1
M27008Capacityhatassembly 4
M270096m(50MHz)radialelement
 trapcoilassembly  1
M2701010m(28-29MHz)radial
 elementtrapcoilassembly 1
M2701115m(21MHz)radialelement
 trapcoilassembly  1
M2701240m(7MHz)radialelement
 trapcoilassembly  1
M27013Radialelement  4
M27014Radialelementfastenerring 4
M27015Gripnut   4
M27016HexheadscrewM6x8 3
M27017SpringwasherM6  3
M27018TappingscrewM4x8 4
M27019I
nternaltoothlockwasherM4  4
M27020Capacityhatfastenerring 1
M27021V-boltwithnut  2
Nutwithradial
elementfastenerring
Screwwithradial
elementfastenerring
Screwwithradial
elementholder
※Radiatorhasawaterdrainhole.
Leaveitopened.
Grip nut

21MHz
7MHz
(Fig-3)
(Fig-4)
Radialelement
trapcoil
Gripnut
Radialelementfastenerring
Adjustlengthofradialelement
・Antennalocation
ResonatefrequencyofHFantenna
canchangebasedonlocation.
Antennashouldbemountedaway
fromtree,buildingandotherantennas.
①IftheCP-725Hislocatedonthe
roofofahouseortopofabuilding,
lookaroundtherooftoseeifthere
areanyobstaclessuchasTV
antennaorwaterreservationtank.
TheCP-725Hhastobelocatedas
farawayaspossiblefromthose
thingstoobtainitsmaximum
performance.
②IftheCP-725Hisinstalledona
balconyrailing,installingtheantenna
tooclosetothebuildingwallmay
causebadeffectforelectrical
characteristicsoftheantenna.Locate
atleast2mto5m(7ʼto16ʼ)away
fromthebuildingwalldependingon
structureofthebuilding.
<<Note>>
・Fasteningtheradialelementtrap
coilassemblytightlymaybe
damaged.
・Inthecaseofspreadaroundstyle
radialelements,theturntofixthe
radialsisrestricted.However,the
radialsofthelowerfrequencies
aremoreinfluencedbythe
surroundingcondition.Setthe
<<RumblingThunder>>
①Thethunderseemstorumblein
thevicinity,donʼttouchthe
antennaandcoaxial.Whenyou
donʼtusetheradio,takeoffthe
cablefromtheradio.
<<Ifthereissomethingwrong,stop
transmittingimmediately.>>
①KeepingtransmittingwithhighVSWR
maycausetheradiotobedamaged.
Stoptransmittingimmediatelyand
checkthefollowingmatters.Ifit
doesnʼtsolvetheproblem,please
askthedealerorDiamondAntenna
Corporation.
[Condition:Iftheantennadoesnʼtseem
toreceivewellorpropagatewell]
Check1:Istheantennatoocloseto
thebuildingwall?Iftheobstaclesare
tooclosetoantenna,VSWRishigher
andtheradiationpatternisdisturbed.
Pleaseinstalltheantennafromthe
buildingasfarawayaspossible.
Check2:Didyouassembletheantenna
correctly?Pleasereadtheinstruction
againandreconfirmtheassembly.
Check3:Isthecoaxialcablesomething
wrong?Pleasecheckifsolderingthe
connectorisokayandthewirebreaks
bythevolt-ohmmeter.
radialsfor40masfarawayas
possiblefromthebuildings.
・Inthecaseoftheonedirection
styleradialelements,setthe
radialfor40mandonetheradial
for15matthebothend.
(Fig.3-4)
・Incaseofusingthemetallicstay
wire,setthewireonthelower
mastbracketsetandattachthe
insulatorsatwithin1mfromthe
mastbracketsetinorderto
insulate.
・Itispossibletoremovethe
radialsyoudonʼtusetheband
for.
（Fig2）
(Fig-5)
Onedirectionstyleradialelements
Spreadaroundstyleradialelements
-Note-------------------------------------------
《Installingtheantenna》
①Donʼtinstallonarainyorwindyday
sinceitisdangerous.
②Donʼtattempttoinstalltheantenna
onlybyyourself.Installingtheantenna
aloneontheroofmayleadyou
dangerousaccident.Alwaysaskyour
friendsforhelpinstallingtheantenna.
③Donʼtdroptheantenna,toolsand
attachmentwheninstallingtheantenna
intheheight.Installtheantennabefore
assemblingitontheground.
《Antennalocation》
①IftheCP-725Hislocatedonthe
roofofahouseortopofabuilding,
lookaroundtherooftoseeifthere
areanyobstaclessuchasanelectronic
wireorTVantenna.TheCP-725H
hastobelocatedasfarawayas
possiblefromthosethingstoobtain
itsmaximumperformance.Installing
theantennatooclosetothebuilding
wallmaycausebadeffectforelectrical
characteristicsoftheantenna.
②Donʼtinstalltheantennawhereis
easilyreachablebypeople.
③Installtheantennafirmlynottofall
downduetothestrongwind.Even
iffallingdowntheantenna,locate
theantennaatthesafeplacewhere
peopleandbuildingarenotinflicted
injures.
《Beforetransmitting》
①Transmitafterconfirmingifthe
antennaworksnormallybyanSWR
meter.IfVSWRislessthan1.5,itis
noproblem.IfVSWRishigher,stop
transmittingandcheckiftheparts
oftheantennaandcoaxialcableare
connected.Iftherearetallbuildings
orobstaclesorthedistancebetween
theantennaandthegroundisshort,
VSWRmaynotbelowered.
※DiamondAntennaSWR/POWERmeter
isaninsertiontypebeingconnected
betweenatransmitterandanantenna.
TransmittingpowerandSWRcanbe
measuredwithverysimpleoperations.
Inadditionwiththoseconventional
measurement,PEP(peakenvelope
power)onSSBmodecanbemeasured
withaPEPmonitorfunction.Withour
Diamondʼswidebandandlowinsertion
lossdirectionalcouplerthose
measurementscanbeperformedwith
minimumeffectintransmissionline.
<<Duringtransmitting>>
①Touchingtheantennaduring
transmissionmaycausetoelectrify.
Payattentionnottotouchtheantenna
especiallyforchildrenifinstalling
onabalconyrailing.
・AssemblyInstruction
①Putradialelementineachradial
elementtrapcoilassemblyby
referringtothetypicalelement
lengthlistedinTableAandfasten
itwithelementfastenerring.
(Figure-5)
②Setgripnutrightlytotreadedpart
ofeachradialelementtrapcoil
assembly.
③ConnectpipeNo.1,doubleelement
trapcoilassembly,andpipeNo.2
intheverticalelementsectionand
fastenthemwithtappingscrews
andinnertoothwashersbyaligning
holesineachjointsection.
④Attachfourcapacityhatassemblies
toeachcapacityhatholdersection.
Capacityhatholdersaresetatthe
specifiedsectionsinthefactory.
Locationsforthosecapacityhat
holdersarefixedatabout8cm(3.1”)
belowthetopendofdoubleelement
trapcoilassemblyforlowercapacity
hatrespectively.

7 -14 f0 +14
21 -100 f0 +100
28-29 -125 f0 +125
50 -1500 f0 +1500
MHz KHz KHz
CP-725H
1.5
1.4
1.3
1.2
1.1
(Fig-6)
(Fig-7)
(Fig-8)
(TableA)
Mastbracket
V-bolt
Springwasher
Mast Support
pipe
Nut
Supportpipe
Mast
Applox.12cm(4.7")
Coaxialcable
Trappinghole
thisside
Radiator
Screw
(2pcs/upper
&lower)
Hexheadscrew
Hexheadscrew
Feedpointassembly
Gripnut
Mastsupportpipe
Radialelementholder
Alignwaterdrainhole
downwardwhenattach
Radialelement
Tranceiver VSWR
meter
Band Spread One Length/
 radials direction Frequency
  radials
40m Applox. Applox. 10mm/
(7MHz) 570mm 530mm 10KHz
15m Applox. Applox. 32mm/
(21MHz) 680mm 620mm 50KHz
10m Applox. Applox. 27mm/
( 28-29MHz ) 600mm 590mm 50KHz
6m Applox.Applox. 50mm/
(50MHz) 550mm 550mm 1MHz
⑤Attachmastsupportpipetomast
withmastbrackets.Mastsupport
pipeʼstappingholehastobeplaced
abovethebracketsandithastobe
pointedoutsideagainstthemast.
Upperendofmastsupportpipe
hastobeplacedmorethan12cm
(4.7”)abovethetopendofthemast.
⑥Placetheradialelementholderfrom
upperendofthesupportpipeand
fastentemporarywithscrewdriver.
Donotfastentootightlyatthisstage,
otherwisefeedpointassembliesmight
notbeputintothesupportmastlater.
⑦Connectacoaxialcabletofeedpoint
assemblethroughthesupportpipe.
Thenaligntheholeinthelowerpart
offeedpointassemblywiththehole
inthesupportpipeandsecurethem
withhexheadscrewandspringwasher.
⑧Placeverticalelementonfeedpoint
assemblyandfixwithtwohexhead
screwsandspringwashers.
⑨Turneachradialelementintoradial
elementholders.Thenalignwater
drainholeineachradialelementtrap
coilassemblydownwardbyturning
backwardandfasteneachelement
withgripnut,Notethat6mradial
elementdoesnothavetrapcoil
assembly.
<<Note>>
Toavoidbreakingeachradial
elementtrapcoilassembly,turnit
intoaholderlightlytillitstopsand
turnbackwardtoalignwaterdrain
holedownwardandsecurewitha
screw.
・Adjustment
<<Noteforfrequencyadjustment>>
Practicethefollowingadjustment
procedureattheplacewherethe
antennaisactuallyinstalled.Test
transmissionfortheadjustmenthas
tobeperformedforasshorttimeas
possibleandwithaslowRFpoweras
possible.MaximumRFpowerratingof
continuouswave(FM/CW)isabout
1/3ofitinSSBmode.Iftheantenna
isinstalledonalongbalconyrailing,
therailingitselfmayworkasaradial
elementandVSWRoftheantennamay
notbechangedwiththeadjustment
ofattachedradialelementlength.If
resonantfrequencyoftheantennais
withinadesiredrange,theantennacan
beusednormallyinthiscase.If
resonantfrequencyisoutofdesired
frequencyrangeandadjustmentis
required,theantennahastobeisolated
fromtherailing,movedtoadifferent
placeorinstalledonamast,whichis
atleast1mto2m(3.3ʼto6.6ʼ)long.
①PreparesuitableVSWRmeterfor
operatingfrequenciesandoutput
RFpower.Thenconnectitasshown
inbelow.
②Adjustmentprocedurecanbestarted
fromanyfrequencyyoulike.Transmit
atdesiredfrequencyandtrim
adjustmentlengthofradialelement
tohavelowerVSWRatthefrequency.
・Adjustmentlengthofradialelement
①Adjustmentlengthofeachradial
elementisshowninthefollowingtable.
IfyoudonothaveaVSWRmeter,
adjustittoatypicaladjustmentlength.
※Iftheradialelementofabandismade
longer,resonantfrequencyoftheband
ismadelowerproportionally.
※Thoughtypicaladjustmentlengthof
eachradialelementissetatcenter
frequencyofeachband,itvariesmore
orlessdependingontheplacethe
antennaisinstalled.
Adjustmentexample:
Ifcenterfrequencyof40mbandisset
at7.050MHzandrealcenterfrequency
whentheantennaisinstalledisat
7.010MHz,thenfrequencydifference
betweenis:
7.050MHz(desiredcenterfrequency)
‒7.010MHz(realcenterfrequency)
=40KHz
・Specifications
Frequencyrange 40,15,10,6m
  (7,21,28-29,50MHz)
FeedpointImpedance 50Ω
VSWR Lessthan1.5
Maximumpowerrating
 200WSSB(7MHz)
 400WSSB(21MHz)
 500WSSB(28/29/50MHz)
MaximumRFpowerratingof
continuouswave(FM/CW)isabout
1/3ofitinSSBmode.
Maximumwindresistance 100MPH
   (45m/sec)
Verticalelementlength 142”(3.6m)
Radialelementlength 71”(1.8m)
Weight   6.6lbs(3.0Kg)
Mastdiameteraccepted 11/5”‒21/3”
   (30-62φ)
Design 4bandtrapverticalantenna
 withtrapradials
Thoughtheseproductspurchased
aremanufacturedunderstrictquality
control,ifdamageiscausedby
transporting,askyourdealerpromptly.
Designandspecificationsofthese
productswillbechangedforfuture
improvementwithoutadvancenotice.
FromTableA,adjustmentlengthat
40mbandisabout10mmper10KHz,
therefore:10mmx40KHz/10KHz=
40mm,Sincerealcenterfrequencyis
lowerthandesiredcenterfrequency,
radialelementhastobemade40mm
shortertohave7.050MHzcenter
frequency.
・VSWR
DIAMONDANTENNACORPORATION
MiyataBuilding,No.15-1,1-chomeSugamo,ToshimakuTokyo,Japan170-0002TEL.[phone]FAX.[phone]
HomePagehttp://www.diamond-ant.co.jp
E-mail[email protected]