Specifications Oo - Kenwood TH-28A Service Manual

TH-28A/E
AAS WI ee ee
WR-2 External View
75
TH-28A/E
SPECIFICATIONS
GENERAL
_ Frequency range (MHz)
STR WON Zc) 6 0) 9 TEESE EESESEEESOSEOOSCOOOOOSOOOSOOOOOOOOOOOOOOOOOOOOOOOS
OOOO OSSEOSSaOSSSSR 144 to 148
U.K. ANG EUPOPO .iecescccescsccscsesseceseeeneeeeseseseeeeseesseseseseseseeeseteeeneeee
esses ceeieueees et CUUS EC EO SSE OEE E SCE GEUEE LE SE SESE! 14410 146 |
ORR] Market —ccccccccccccceecscccsccceccceceecvevenseeeeseseeescsseeeeeeeeeeeeeeeeseeGee000
E02 0EEDEGOGEELEEEEELEEESEEEEECLELE EEE EEE ACETAL EEE 144 to 146 or 144 to 148
IV, oe
(ne OOOOOSOOCEOOOOOOOOOOOOOOOOOOOOOSIE F3E (FM)
ANTENNA IMPCAANCE
.a.cececesscceseeeeesseseeseesesseeeeeeeseeeeneeeetee
ee eeeseESSEEEEEE SEEDS EEEEEE EEE EEEEEEEE SEER ES ET ELECL CRESS
50Q
Operating temperature
..seecccceccsessseseesssneneseseseseeseceeneeneeneneseseseeeseeeen
eee ne nee Se SESSA ESSE Seg gO SE TEESE TS -20°C~+60°C (-4°F~+140°F)
- Power requirements
| DC IN (nominal) ....ccccccsccssccsscsessesccseseceeseeeenee
en eeeseeecne epee erst eRE Ee EDIE ECTS ELIE EOD EEESSE EERE EES EEEEES EOE GS d e t e sasaaeaeeeeees
7.2V~16V DC (13.8V DC)
Battery DaCK v..ccccccccesesseseesecseeesesseesessesseseenensersneeeeteeesnenensereseeeneseereneytas s c dceueversececeecveseeeeettssiiieseseesensians
6.3V~16V DC (7.2V DC)
Current drain (Approx.)
13.8V DC (Ext. Power SUDDIY) Hv.cccccscccccsecsesserereeesseeeeneeseceeeere
ee eeee tense OAS ESE E E EEE EERE USES CREE SE ECR C eT 1.4A
7.2 DC (Battery) Ho cccccccccccscccsscssesseesenereeseeecseesesessneeeeseeeeeeaseeseessee
seas eee eects e CSS EES CEES CEE UE SEC EE EC 0.95A
TFANSMIt MOD] Lo cecccccccessecesscececseennecseceeceeceeeseseeeeeeeeeeeeeebeseeEDEEEEAGEESEEEEEEIAAUSALEDE
EES GAEOEEEL ESC GSGEDE TEESE T ELGG . 0.5A
TFANSMIt MOE] El cc.ccccccccccseccceccceeeeueeseseeeeeeseeeee
ees eepeEDEDESEEEEE GAAP ELLE SEES EAD EEEELSEEEA AIDES EE EE EES deveeeeceaueseeeeeeeataesenees
30mA
Receive mode With no Signal
.......ecceeeceeeeeeeeeeees PEE
O rTP INET TEE TSE TEE TIPOTITTSTSTSOOSIOOIESSIOSIOOSSESTOOOOOOOOOOIOOOOO
55mA
Battery SAVE MOS ooceccccecessceccecnseneeneeeeteeeeeeeeeeeeeeEeeseDeEEC
EADS EEEEEAEIS SAS ASEISEEEEEE EERE S LESSER SEES SEREEREES EET ES ET SES G2 15mA
GOUNG — ..cccccccccccccccccusstseeecetsscecentecereeeeseeeeeeeeseee60eeeeeeeGeeeEDEELEIEAEEEELESSCLE
EEE GHEDEAGIIAEEESESSEDEEEDEEEEEOLGLEELEEEE ELSES E 208 Negative
Dimension (W XH XD) ccccccccccessceencessessesseeeseeeeeeneeeeeeeeeeeee
ODDS EeER EEE EDE EEE EEE EEEEIEAIEAEES ECD GAEEEELOUEE GLEE LESS EEEEAE ETE O EEO 49.5x 115.8 x 37.8 mm
Dimension (Projection Included) ............... c e e
ee eeceeeuauGuEeee GEG Ga EE;E SG AGE DAHAAEELAG AA ELEE;GILEDEDLAD IE EEA;AHE ESSE II EEEEESS IHD
61.2x 131.5 x37.8mm
TAY - 116] 0 a EOE
EEOSOSSOCOSSOCOSOOOOSOOSOOOOOOOCOOOOOOOOOOOOOOOO
OOOO COCS SESS SSS SSSR 330g
Microphone iMPCdANCe
w.scecccesecesssesssscsscessseeeneeneneenesee
tenet teen See EES ADELE EEL TEESE ESSE S SEE SREE CERES CEES S ESSEC EEE 2kQ
TRANSMITTER
Output power
H(13.8V DC)
ooecccccccccceccccsceeeeeeeeeeseeeeeess coo
cccccceee eee ecad WEEE NEARED EDEL LEDER DEE RET UTIL OLED A ADEE EEE ES eeteene nas negtetbetenes
More than 5W
H(Z.QV DC) cecccccceccsscccscecssseccsecseseeeeeeeeeeeeeeeesesseseneesseseeeecieeee
ene S Ce SEES DASE SEE EEICEESEEE EE EISES ELISE ERES ORIEL SELES E CE Approx. 2VW
M (13.8V DC) ccc ccccceaaueceuaaaeauauuaauananaerensneneeneseeeeeeeeeseeeeeeeEeEEEEEEEEEELEEEEEOEEE;
CE OEP EEDEEEEEEEESEEPEEESTEEEEEEEES EO Approx. 2.5W
oe
E(ZOW DC ae wo TTT luaannsbinninsuninnnvinen Sa oe re
yy
yyivssutissvssssesvsseavssanenas Approx. 0.5Wo
EL (7.2V DC) cere
vovneevene sc cuuueeeneeeeuacuanueseceaanaeeseseetabaDeLEeeOeSA;;OAEDESSESELASS;SA;GAHLIIOEDS
Approx. 20mW
IN, ote [6] (= 50] 9 eae
OOOO EET EO TE SSS SEEOSESSESOTSOSSOSOCIOSESOSOSEOOOOSOOCOOOOOOOOOOOOOOSOOOOOOO
OSS CSC SoSSSSSSOSSS Reactance
Max. frequency CeViation
...cccececccesesseeesesetsrerseressesesesetstenenensiensnerssssnererssserenenenenenenensss seeeneeenenses sects
ZOKAZ
SPUriOUS FAGIATION oo...
eset eeeteeeeeteeeeenees i eeveevevnenseeueeeeseees vc cauauavaaeessveseeeseeeeeseeereeeunnns cuueeeevecceeecteseesenenenes Less than —60dB
RECEIVER
(OFT 01011 a
EEE
ESET SESEPOESSSESOSSSSSSOCESOSSOECOSOSOOOOSOOOOOSOOOOOOOOOOOO
OOOO SSCA SSEOEOS OSSD
Double conversion superheterodyne
Intermediate freqUueNCy TST ou...
eeeseeeteerenteeeeees cccuecececevecesauuueeseeesnaeneneeseGeeeOSSODSCGH
AAD HIEEEEDS EIDE EEEAEEEEEEDEDS #0003 45.05MHz
Intermediate frequency ZN
......cceccseetesrseertereceeteeeteens peeeeesueeseneeveseeseseesnneeenaeertnees aveceeceensccuaneseseaueseseenaeness 455kHz
Sensitivity (12dB SINAD)
oo... cece eeeeeeeeseereneeerseneeetrereerieeeerseneeeney veneeueseusesensscecenscacevserasseenerseeneneenesseerneyents Less than —15dBy (0.18pV)
Squelch Sensitivity
.c.ccccscccccsessscesessstsvsvenerevsnsessessseasscansnsenessnenensssssssssssessseseneneeeeesenerseseseeeeeeeaneeeegegeereeeeeus Less than -20dBp
(0.1pV)
SELECTIVITY
; |
ole | = Eee
EEE ee cccuevacacsecseavsvesuecavsvvsvecseesesecssvesenecesssecsssssesssssneneessereenseeresitias More than 12kHz
-40dB vee
o o ccuneauaaueeueceeecauueseeeaaneeeeueeeeeanAnHaAAAEEESEDEEGADDEDEDS
EG AE EEEDEEEIADEEEEEEOESEEEOGODEEEEEUIUIEEEESEESOUEEEOESS
Less than 28kHz
Audio output power (10% GiStOrtion)
..cscscscesseseseeteteetersererteteeeeseen
ene eneene entree TES ee EEE SEE EERE EE EEE EEE SEE SEES C Te More than 200mW {across 82 load)
- - NOTES»
1. Circuits and ratings are @ subject to 5 change \ without no-
tice, due to development in technology. 7
2. Recommended duty cycle : 1 minute Transmission, 3
minutes Reception.
KENWOOD U.S.A. CORPORATION
TRIO-KENWOOD U.K. LIMITED
Mechelsesteenweg 418 B-1930 Zaventem, Belgium
TRIO-KENWOOD FRANCE S.A.
13, Boulevard Ney, 75018 Paris, France
KENWOOD LINEAR S.P.A.
20125, Milano-via Arbe, 50, Italy
(A.C.N 001 499 074)