constructional project

Download Constructional Project

Post on 03-Jan-2017

219 views

Category:

Documents

5 download

Embed Size (px)

TRANSCRIPT

  • (YHU\GD\3UDFWLFDO(OHFWURQLFV6HSWHPEHU

    Constructional Project

    MEANSOFINDUCTOR,ANDTRIMMERCAPACITOR6#4HEl1mOFTHISCIRCUITISFAIRLYLOWSOTHATTHERECEIVERmSSENSITIVITYISREASONABLYCONSTANTOVERTHE-(ZWIDETUNINGBAND!SARESULTTUNINGISACHIEVEDPURELYBYADJUSTINGTHELOCALOSCILLATORFREQUENCY

    !LTHOUGHTHE3!)#DOESPROVIDEAGREATDEALOFGAININTHE)&AMPLIERANDLIMITERSECTIONSWEHAVEINCLUDED

    AN2&AMPLIERSTAGEAHEADOFTHE)#TOENSURETHATTHERECEIVERHASADEQUATESENSITIVITY !S YOU CAN SEE THIS 2&STAGEUSESA"&DUALGATE-/3&%41WITHTHESECONDGATE'VOLTAGEADJUSTEDVIA62TOALLOWEASYCONTROLOF2&GAIN

    4HE 2& INPUT SIGNAL FROM THE ANTENNA ENTERS THE RECEIVER VIA #/.ANDISFEDINTOTHEINPUTTUNEDCIRCUIT

    ,6#VIAANIMPEDANCEMATCHINGTAPONINDUCTOR,!SBEFORETHEl1mOFTHISCIRCUITISKEPTRELATIVELYLOWSOONCEITmSTUNEDTOABOUT-(ZITDOESNOTNEEDTOBECHANGED

    &ROM THE 233) OUTPUT OF )#THE DEMODULATED AUDIO SIGNALS AREPASSEDTHROUGHOPAMP)#AHALFOFAN ,- WHICH IS CONNECTED AS AVOLTAGE FOLLOWER FOR BUFFERING 4HEYTHENPASSTHROUGHASIMPLELOWPASS2#LTER THEK: RESISTORANDN&CAPACITOR BEFORE BEING FED TO )#B4HIS IS THE OTHER HALF OF THE ,-ANDISCONGUREDASANAUDIOAMPLIERWITHAGAINOF ASSETBYTHEK:ANDK:FEEDBACKRESISTORS

    &ROM)#BTHESIGNALSPASSTHROUGHA N& COUPLING CAPACITOR TO 62THEVOLUMEAUDIOGAINCONTROL4HEYARETHENFEDTHROUGH)#AN,-.AUDIO AMPLIER CONGURED HERE TOPROVIDE A GAIN OF ABOUT 4HEAMPLIEDAUDIOSIGNALSARETHENCOUPLEDVIAAP&OUTPUTCAPACITORTOSPEAKEROUTPUT JACK#/.ANDALSOTOLINEOUTPUTSOCKET#/.VIAAK:ISOLATINGRESISTOR

    .OTICETHATTHEBUFFERED233)SIGNALFROMTHEOUTPUTOF)#AISALSOFEDTOTRANSISTOR1WHICHISUSEDTODRIVE,%$ THE 233)OVERLOAD INDICATOR"ECAUSE 1 DOES NOT CONDUCT UNTILTHEOUTPUTVOLTAGEFROM)#AREACHESALEVELOFAROUND6THISMEANSTHAT,%$ REALLYONLY LIGHTSWHENAVERY STRONG SIGNAL IS BEING RECEIVEDqIEWHENTHERECEIVERISTUNEDTOASHORTWAVERADIOTRANSMISSIONORSOMEOTHERSTRONGTERRESTRIALSIGNALSOURCE3O THE MAIN PURPOSE OF ,%$ IS TOHELPYOUTUNEBXBZFROMSUCHSIGNALSRATHERTHANUPTHEM

    0OWERSUPPLY4HERECEIVERmSPOWERSUPPLYISVERY

    STRAIGHTFORWARD-OSTOFTHECIRCUITRYOPERATESFROM6WHICHCANCOMEDIRECTLYFROMABATTERYIFYOUWISH)NTHISCASEREGULATOR2%'ISNOTUSEDBUT IS INSTEADREPLACEDBYA: RESISTOR 4HE P& CAPACITOR IS ALSOREPLACEDBYA67:ENERDIODETOPROTECTTHECIRCUITFROMDAMAGEINCASEOFHIGHERVOLTAGETRANSIENTSWHENTHEBATTERYISBEINGCHARGEDFOREXAMPLE

    /NTHEOTHERHANDIFYOUWISHTOOPERATETHERECEIVERFROMA6TO6$#SOURCESUCHASAMAINSPLUGPACKSUPPLYTHENTHISISVERYEASYTODO)NTHISCASE2%'ISTTEDTOREGULATETHESUPPLYDOWNTO6WHILEAP&

    3DUWV/LVW3ODQHW-XSLWHU5HFHLYHU

    GRXEOHVLGHG3&ERDUGFRGHDYDLODEOHIURPWKH(3(3&%6HUYLFHVL]HPPPP

    SODVWLFFDVHPPPPPPRSWLRQDO

    0XUDWD0+]FHUDPLFILOWHUV&)&)

    PLQL5)FRLOIRUPHUV-D\FDU/)RUVLPLODU/WR/

    POHQJWKRIPPHQDPHOOHGFRSSHUZLUH

    P+5)FKRNH5)&P+5)FKRNH5)&WULPPHUFDSDFLWRUVS)WRS)JUHHQ9&9&

    S)WRS)PLQLDWXUHWUDQVLVWRUUDGLRWXQLQJFDSDFLWRUZLWKHGJHZLVHNQRE9&-D\FDU59

    N:PPURWDU\3&PRXQWOLQHDUSRW95

    N:PPURWDU\3&PRXQWORJSRW95

    PPGLDPHWHUFRQWURONQREVSLQ',/VRFNHWIRU,&3&PRXQW5&$SKRQRVRFNHWV&21&21

    PP3&PRXQWVWHUHRMDFN&21

    PP3&PRXQWFRQFHQWULF'&SRZHUVRFNHW&21

    72%ILQQHGKHDWVLQN0PPWDSSHGVSDFHUV0PPPDFKLQHVFUHZV0QXWVWZRXVHGDVVSDFHUVIRU9&

    0PPPDFKLQHVFUHZVIRU9&

    PPFRSSHUVKHHWRUWLQSODWHIRU,&VKLHOG

    PPFRSSHUVKHHWRUWLQSODWHIRU4VKLHOG

    PPPRQRMDFNSOXJWRPPPRQRMDFNSOXJDXGLRFDEOH

    6HPLFRQGXFWRUV6$'VXUIDFHPRXQWVLQJOHFKLSUHFHLYHU,&,&

    /0GXDORSDPS,&/0DXGLRDPSOLILHU,&9YROWDJHUHJ5(*/9YROWDJHUHJ5(*%)GXDOJDWH026)(7431131WUDQVLVWRU4PPJUHHQ/('/('PPUHG/('/('1GLRGH'9:=HQHUGLRGHRSWLRQDO

    &DSDFLWRUVP)9UDGLDOHOHFWURO\WLFP)9UDGLDOHOHFWURO\WLFP)9UDGLDOHOHFWURO\WLFP)9WDJWDQWDOXPP)9UDGLDOHOHFWURO\WLFQ)0.7PHWDOOLVHGSRO\HVWHUQ)PRQROLWKLFFHUDPLFQ)0.7PHWDOOLVHGSRO\HVWHUQ)PRQROLWKLFFHUDPLFQ)GLVFFHUDPLFS)GLVFFHUDPLFS)132GLVFFHUDPLFS)132GLVFFHUDPLFS)132GLVFFHUDPLF

    5HVLVWRUV:N: N:N: N:N: :N: :N: :N: :N: :N: :N: :N:

    $QWHQQD3DUWV8%SODVWLFER[PPPPIHUULWHWRURLG-D\FDU/2RUVLPLODU

    RKPFRD[LDOFDEOHSOXV5&$SKRQRSOXJIRUGRZQOHDG

  • (YHU\G

    D\3UDFWLFD

    O(OHFWUR

    QLFV6

    HSWHPEHU

    Co

    nstru

    ctio

    nal P

    roje

    ct

    IN OU T

    A K

    A

    A

    K

    K

    IN OU T

    50

    RF

    IN PUT

    Q1

    BF998

    150k

    22k

    1. 8k

    3602 x

    2. 2nF

    2. 2nF

    2. 2nF

    2. 2nF

    10 F

    +12V

    110k

    2. 2nFL1

    L21. 8 H

    L31. 2 H

    VC 16-30pF

    47k

    VR150kLIN

    RF GA IN

    RFC147 H

    22 pF 10nF

    39 pF

    39 pF

    VC 26-30pF

    RFC268 H

    100n F22 FTANT

    10 nF 10 nF

    100nF

    10nF

    100n F

    5. 5MHz 5. 5MHz

    82 0 1k1k1k

    10nF

    100n F

    AUDIOOU T

    TO PC

    +12V

    1k

    470n F

    IC 3

    LM386N

    IC 3

    LM386N

    8

    SPEA KER

    OU T

    47nF

    10

    10 F

    16V

    10 F

    16V

    VR2

    50k

    LOG

    1. 5k

    220

    LED2

    RSSI

    100 k

    10 nF

    47k

    +6V

    +6V

    100nF

    300

    47

    D1

    REG1 7812 REG2 78L05

    470 F

    25V

    2200 F*

    2. 2k

    +12V

    LED1

    POWE R

    ZD1*

    16 V

    1W

    FIT 10 RESISTOR

    (12V BATTERY

    SI

    IC 1 SA 605DIC 1 SA 605D

    +

    330 F

    16V

    AU DIO

    C

    B

    E

    4

    5

    6

    7

    8

    10

    11

    1213 141516

    1

    2

    3

    4

    5

    6

    7

    8

    IC 2aIC 2a1

    2

    3

    IC 2: LM358

    1

    2

    34 5 6 7

    8

    20 19 18 17

    G1

    G2

    S

    D

    * ZD1 FITTED IN PLAC E OF 2200 F

    CA PACITO R WH EN REG1 IS NO T

    USED (1 2V BATTERY KA

    Q2

    PN 10 0

    INOU T

    7812

    1N 4004

    S(1)

    D(2)G1 (4 )

    BF998

    G2 (3 )

    1

    2010

    SA605D

    LEDS

    A

    K

    470p F

    A

    K

    100

    2. 2nF

    1. 5k

    MXROU T

    RFIN 1

    RFIN 2

    B

    LCL OS C

    E

    IFAIN

    IFAOU T

    Vc cMUTE

    LIMIN

    RSSI

    CH AM FERSIDE

    CO N2

    18p F

    1. 8 H

    18p F

    VC 310-120p F

    91k

    IC 2bIC 2b220k

    220k

    1k 100n F

    100n F

    10 F

    10k

    +12V

    OR SI MILARTUNI NG

    78L05

    OU TIN

    CO M

    C E

    B

    PN 100

    ZD1

    A K

    21MHZ PLANET JUPITER RECEIVER

    COIL DETAILS:

    L1, L2 & L3 all on Jaycar LF-1227 3mm diameter

    mini coil formers using 0.25mm enamelled copperwire, close wound at bottom of former.

    L1: 20 turns with tap at 4 turns from earth end

    L2: 20 turns

    L3: 15 turns

    NOTE: Ferrite slugs and shield cans are NOT used

    CON1

    CF1

    100nF

    CF2

    NOTCH

    GND

    CERAMIC FILTERS CF1 AND CF2ARE MURATA SFSRA5 M50BF00-BO

    15-18V (OR 12V)DC INPUT

    CON4

    1N4004

    WHEN REG1 NOT USED

    OPERATION)

    GND

    CON3

    GAIN

    GND

    16V

    OPERATION)

    &IGTHECIRCUITISBASEDONAN3!$SURFACEMOUNTSINGLECHIPRECEIVER)#)#WHICHINCLUDESALOCALOSCILLATORAN2&MIXERAHIGHGAIN)&AMPLIlERANDAN)&LIMITINGAMPLIlERPLUSAQUADRATUREDETECTORFOR&-SIGNALDEMODULATION4HELATTERFEATUREISNOTUSEDHERE)NSTEADTHE3!ISUSEDINASLIGHTLYUNUSUALWAYTOOBTAIN!-SIGNALDEMODULATION

  • (YHU\GD\3UDFWLFDO(OHFWURQLFV6HSWHPEHU

    Constructional Project

    TOADJUST6#INTHESAMEWAY)NTHISCASEYOUWILLALMOSTCERTAINLYHAVETO REDUCE THE OUTPUT LEVEL FROM THEGENERATORTOPREVENTOVERLOAD

    )N FACT BY THE TIME THE TUNINGPROCEDUREISNISHEDTHEGENERATORmSOUTPUT SHOULD BE WOUND DOWN TO AMEREP6ORSO

    .O2&GENERATOR)FYOUDONmTHAVEACCESSTOAN2&

    GENERATOR YOUmLL HAVE TO DELAY THISTUNING OPERATION UNTIL YOU HAVEBUILTTHERECEIVERmSANTENNAERECTEDITOUTSIDEINASUITABLEPOSITIONANDCONNECTEDITTOTHERECEIVERmSINPUTSOTHAT

    ITCANPROVIDEYOUWITHSOMESORTOFSIGNALqEITHERASHORTWAVEBROADCASTINGSTATION SOMEWHERE IN THE -(ZTO-(ZRANGEORJUSTSOMEATMOSPHERICNOISE-OREABOUTTHISSHORTLYAFTERWEmVETALKEDABOUTANTENNAS

    !NTENNASFOR-(Z&ORRECEPTIONOFNOISEBURSTSIGNALS

    FROM*UPITERORTHE3UNINTHENORTHERNHEMISPHERE THE 2ADIO *OVE PEOPLERECOMMENDTHEUSEOFATWINDIPOLEANTENNAARRAYINWHICHTWOHALFWAVEDIPOLESAREEACHALIGNEDINANEASTWESTDIRECTIONANDSPACEDABOUTONEHALFWAVEAPARTANDWITHBOTHSUSPENDED

    ATLEASTMABOVEGROUND4HEOUTPUTSOFTHETWODIPOLESARECOMBINEDUSINGAPHASINGCABLEARRANGEMENTTOTILTTHEANTENNAmSMAINRECEIVINGLOBETOWARDSTHESOUTHqBECAUSECURRENTLY*UPITERmS ORBIT IS INCLINED SOMEWHATSOUTHOFTHEEQUATOR

    )NFACTTHElDECLINATIONmOFITSHIGHESTPOINTlTRANSITmINMOVINGOVERTHESKYVARIESBUTITISCURRENTLYSUMMERRISINGSTEADILYANDWILLCONTINUETODOSOFORSEVERALYEARS

    (OWEVERWITHOURCIRCUITITSHOULDBEQUITEFEASIBLETOUSEABASICSINGLEDIPOLEANTENNAFORRECEPTIONOF*UPITERmSNOISEBURSTS!CCORDINGLYWEHAVEPRODUCEDAND TESTED THE VERY SIMPLE ANTENNADESIGN SHOWN IN &IG )T CONSISTS OFASINGLELENGTHOFMULTISTRANDCOPPERWIREWEUSEDONESIDEOFALENGTHOFGURESPEAKERCABLECUTTOALENGTHOF MM METRES TO MAKE ITRESONANTATVERYCLOSETO-(Z

    4HISANTENNASHOULDBESUSPENDEDAT LEAST M ABOVE THE GROUND ANDALIGNEDASCLOSELYASPOSSIBLETOANORTHSOUTHDIRECTION)DIDTHISBYTAPINGITTOAMLENGTHOFNYLONCLOTHESLINEROPEWHICH WAS THEN RUN BETWEEN A HIGHPOINTONTHEGABLEOFMYHOUSEANDTHETOPOFAMMASTATTACHEDTOTHESIDEOFAWORKSHOPINTHEBACKYARD

    4OCOUPLESIGNALSFROMTHEANTENNATOACABLERUNNINGBACKTOTHERECEIVERmSINPUT)MADEUPABALUNBALANCEDTO

    6960mm

    35mm OD x 13mmthick L15 toroidONE END OF SECONDARY

    CONNECTED TO CENTRECONDUCTOR OF COAX,

    OTHER END TO SHIELD BRAID

    (COAXIAL DOWNLEADTO RECEIVER)

    CENTRE OF ANTENNA WIRE LOOPED THROUGH TOROID 6 TIMES, TO FORM PRIMARY OF BALUN.SIX LOOPS OF SAME WIRE PASSED THROUGH TOROID TO FORM SECONDARY WINDING.

    FOR BEST RE

Recommended

View more >