FMUSER RF Power Amplifier Voltage Test Bench ye AM Transmitter Power Amplifier (PA) uye Buffer Amplifier Testing.

RF Simba Amplifier Board Testing | AM Kutumira Mhinduro kubva kuFMUSER

 

RF simba amplifiers uye buffer amplifiers ndizvo zvakanyanya kukosha zvikamu zve AM transmitters uye inogara ichiita basa rakakosha mukutanga dhizaini, kuendesa, uye post-kugadzirisa.

 

Izvi zvakakosha zvinogonesa kutapurirana kwakaringana kwemasaini eRF. Zvichienderana nechiyero chesimba uye simba rinodiwa neanogamuchira kuti aone uye atore chiratidzo, chero kukuvadzwa kunogona kusiya nhepfenyuro nekukanganiswa kwechiratidzo, kuderedzwa kwesimba rekushandisa, nezvimwe.

 

 

Pakuzogadziridza uye kugadzirisa kweiyo yakakosha zvikamu zvevatepfenyuro, mimwe midziyo yakakosha yekuyedza yakakosha. FMUSER's RF kuyerwa mhinduro inokubatsira kuti uone dhizaini yako kuburikidza isingaenzaniswi neRF kuyerwa kuita.

 

Ainoita

 

Inonyanya kushandiswa kuyedza kana iyo simba amplifier board uye buffer amplifier board ye AM transmitter isingagone kusimbiswa mushure mekugadzirisa.

 

 

Features

 

• Iyo magetsi ebhenji rekuyedza ndeye AC220V, uye pani ine switch yemagetsi. Mukati inogadzirwa -5v, 40v, uye 30v inopihwa neyakavakirwa-mukati switching magetsi.
• Kune buffer yekubuda bvunzo Q9 inopindirana pachikamu chepamusoro chebhenji rekuyedza: J1 uye J2, simba amplifier kubuda bvunzo Q9 nzvimbo dzepakati: J1 uye J2, uye simba amplifier voltage chiratidzo (59C23). J1 uye J2 zvakabatana kune kaviri-yakabatanidzwa oscilloscope.
• Rutivi rwekuruboshwe rwechikamu chezasi chebhenji rekuyedza ndiyo buffer amplification test chinzvimbo, uye rutivi rwekurudyi ndiyo simba amplifier board test.

 

Instructions

 

• J1: Edza shanduko yemagetsi
• S1: Amplifier board test uye buffer board test selector switch
• S3 / S4: Simba amplifier bhodhi bvunzo kuruboshwe uye kurudyi-kuvhura-kuvhura chiratidzo kana kudzima sarudzo.

 

RF Simba Amplifier: Chii uye Kuti Inoshanda Sei?

 

Mundima yeredhiyo, RF simba amplifier (RF PA), kana redhiyo frequency simba amplifier chinhu chakajairika chemagetsi chinoshandiswa kukwidziridza uye kubuda zvemukati zvemukati, izvo zvinowanzo ratidzwa sevoltage kana simba, ukuwo RF simba amplifier basa rekusimudza. zvinhu izvo "inotora" kune imwe nhanho uye "inotumira kunze kwenyika."

 

Chinoshanda sei?

 

Kazhinji, iyo RF simba amplifier inovakwa mukati meiyo transmitter muchimiro chebhodhi redunhu. Ehe, iyo RF simba amplifier inogona zvakare kuve mudziyo wakasiyana wakabatana nekubuda kweiyo yakaderera-simba inoburitsa transmitter kuburikidza neiyo coaxial tambo. Nekuda kwenzvimbo diki, kana iwe uchifarira, unogamuchirwa Siya mhinduro uye ini ndichaigadzirisa rimwe zuva mune ramangwana :).

 

Kukosha kweiyo RF simba amplifier kuwana yakakura zvakakwana RF yekubuda simba. Izvi zvinodaro nekuti, chekutanga, kumberi-kumagumo dunhu redhisheni, mushure mekunge chiratidzo cheodhiyo chaiswa kubva kune odhiyo sosi mudziyo kuburikidza nemutsetse wedata, inoshandurwa kuita isina kusimba RF chiratidzo kuburikidza nemodulation, asi idzi dzisina simba. masaini haana kukwana kuti asangane nenhepfenyuro huru. Naizvozvo, aya maRF modulated masaini anoenda kuburikidza neyakatevedzana yeamplification (buffer nhanho, yepakati amplification nhanho, yekupedzisira simba rekusimudzira nhanho) kuburikidza neRF simba amplifier kudzamara yakwidziridzwa kune simba rakakwana uye yobva yapfuura nepanetiweki inoenderana. Chekupedzisira, inogona kupihwa kune antenna uye nekuburitswa kunze.

 

Pakushanda kweanogamuchira, transceiver kana transmitter-receiver unit inogona kuva neyemukati kana yekunze kutumira / kugamuchira (T / R) switch. Basa reT/R switch ndere kushandura antenna kune transmitter kana inogamuchira sezvinodiwa.

 

Chii chinonzi Basic Structure yeRF Power Amplifier?

 

Iwo makuru tekinoroji zviratidzo zveRF simba amplifiers isimba rekubuda uye kushanda nesimba. Maitiro ekuvandudza simba rekubuda uye kushanda zvakanaka ndiyo musimboti wezvinangwa zvekugadzira zveRF simba amplifiers.

 

Iyo RF simba amplifier ine yakatarwa yekushanda frequency, uye yakasarudzwa inoshanda frequency inofanirwa kunge iri mukati meiyo frequency renji. Kune frequency yekushanda ye150 megahertz (MHz), iyo RF simba amplifier pakati pe145 kusvika 155 MHz ingave yakakodzera. Iyo RF simba amplifier ine frequency renji ye165 kusvika 175 MHz haigone kushanda pa150 MHz.

 

Kazhinji, muRF simba amplifier, iyo yakakosha frequency kana imwe harmonic inogona kusarudzwa neLC resonant wedunhu kuti iwane kukanganisa-isina amplification. Pamusoro peizvi, zvikamu zveharmonic mune zvakabuda zvinofanira kunge zviduku sezvinobvira kuti zvirege kupindira kune dzimwe nzira.

 

RF simba amplifier maseketi anogona kushandisa transistors kana akasanganiswa maseketi kugadzira amplifier. MuRF simba amplifier dhizaini, chinangwa ndechekuve neamplifier yakakwana kuti ibudise yaunoda kubuda simba, uku ichibvumidza kwechinguvana uye kudiki kusawirirana pakati peiyo transmitter uye antenna feeder uye antenna pachayo. Iyo impedance yeantenna feeder uye antenna pachayo inowanzoita makumi mashanu ohms.

 

Sezvineiwo, iyo antenna uye yekudyisa mutsara musanganiswa unopa yakanyatso kupikisa impedance pane yekushanda frequency.

Nei RF Simba Amplifier ichidikanwa?

 

Sechikamu chikuru cheiyo yekufambisa sisitimu, kukosha kweiyo RF simba amplifier kunozviratidza. Isu tese tinoziva kuti nyanzvi yekutepfenyura inoparadzira kazhinji inosanganisira zvinotevera zvikamu:

 

1. Rigid shell: inowanzogadzirwa nealuminium alloy, iyo yakakwira mutengo.
2. Odhiyo yekupinza bhodhi: inonyanya kushandiswa kuwana chiratidzo chekuisa kubva kune yekuteerera sosi, uye batanidza iyo inofambisa uye yekuteerera sosi netambo yekuteerera (senge XLR, 3.45MM, nezvimwewo). Iyo odhiyo yekupinza bhodhi inowanzoiswa kuseri kwepaneru yevatambi uye ine rectangular parallelepiped ine aspect ratio inosvika 4:1.
3. Simba rekupa: Inoshandiswa kune magetsi. Nyika dzakasiyana dzine magetsi akasiyana-siyana emagetsi, akadai se110V, 220V, nezvimwewo. Mune dzimwe nhepfenyuro dzeredhiyo huru, iyo inowanikwa magetsi ndeye 3 Phase 4 Wire System (380V / 50Hz) maererano nechiyero. Iyo zvakare inzvimbo yeindasitiri zvinoenderana neyakajairwa, iyo yakasiyana neyakajairika magetsi.
4. Kudzora mapaneru uye modulator: inowanzowanikwa munzvimbo inonyanya kuoneka pane yepamberi pedhivhari, inoumbwa nepaneru yekuisa uye mamwe makiyi ebasa (knob, makiyi ekudzora, skrini yekuratidzira, nezvimwewo), inonyanya kushandiswa kushandura chiratidzo chekuisa odhiyo. muRF chiratidzo (yakanyanya kupera simba).
5. RF simba amplifier: kazhinji inoreva bhodhi remagetsi amplifier, iro rinonyanya kushandiswa kukwidziridza isina simba RF chiratidzo chekuisa kubva kuchikamu chemodulation. Iyo ine PCB uye yakatevedzana yakaoma component etchings (senge RF yekupinza mitsara, simba amplifier machipisi, mafirita, nezvimwewo), uye Iyo yakabatana kune antenna feeder system kuburikidza neRF inobuda.
6. Simba rekupa uye fan: Izvo zvinotsanangurwa zvinogadzirwa nemugadziri wemagetsi, anonyanya kushandiswa kupa magetsi uye kupisa kupisa.

 

Pakati pavo, iyo RF simba amplifier ndiyo yakanyanya musimboti, inodhura zvakanyanya, uye inonyanya kupiswa chikamu cheiyo transmitter, iyo inonyanya kutariswa nemabatiro ainoita: kubuda kweRF simba amplifier inobva yabatanidzwa kune antenna yekunze.

 

Mazhinji antenna anogona kugadziridzwa kuitira kuti kana asanganiswa neanodyisa, anopa iyo yakanyanya kunaka impedance kune inotapurirana. Iyi impedance yekufananidza inodiwa kune yakanyanya simba kufambisa kubva kune transmitter kuenda kune antenna. Antennas ane maitiro akasiyana zvishoma mune frequency renji. Muedzo wakakosha ndeyekuona kuti iyo inoratidzwa simba kubva kune antenna kuenda kune yekudyisa uye kudzokera kune transmitter yakadzikira zvakakwana. Kana iyo impedance mismatch yakanyanya kukwira, iyo RF simba inotumirwa kune antenna inogona kudzokera kune transmitter, ichigadzira yakakwira yakamira wave ratio (SWR), zvichiita kuti simba rekufambisa rirambe riri muRF simba amplifier, zvichikonzera kupisa uye kunyange kukuvadza kushanda. zvikamu.

 

Kana iyo amplifier inogona kuita zvakanaka, saka inogona kupa zvakawanda, iyo inoratidza "kukosha" kwayo, asi kana pane mamwe matambudziko neamplifier, ipapo mushure mekutanga kushanda kana kushanda kwenguva yakati, kwete chete. kwenguva refu Ipa chero "mupiro", asi panogona kunge paine "zvinovhundutsa" zvisingatarisirwi. "Kuvhunduka" kwakadaro kune njodzi kune kunze kwenyika kana iyo amplifier pachayo.

 

Buffer amplifier: Chii uye Kuti Inoshanda Sei?

 

Buffer amplifiers anoshandiswa mune AM transmitters.

 

Iyo AM transmitter ine oscillator nhanho, buffer uye multiplier nhanho, mutyairi nhanho, uye modulator nhanho, uko hombe oscillator inopa simba buffer amplifier, ichiteverwa neiyo buffer nhanho.

 

Danho riri padivi pe oscillator rinonzi buffer kana buffer amplifier (dzimwe nguva rinongonzi buffer) - rakadanwa nekuti rinobvisa oscillator kubva kune simba amplifier.

 

Sekureva kweWikipedia, buffer amplifier ndeye amplifier inopa magetsi impedance shanduko kubva kune imwe dunhu kuenda kune imwe kuitira kuchengetedza siginecha kubva kune chero yazvino (kana voltage, kune yazvino buffer) iyo mutoro unogona kuburitsa.

 

Muchokwadi, kudivi rekutapurirana, iyo buffer amplifier inoshandiswa kuparadzanisa iyo huru oscillator kubva kune mamwe matanho eiyo transmitter, isina buffer, kana simba amplifier rachinja, rinoratidza kudzokera kune oscillator uye kuita kuti ichinje frequency, uye kana iyo oscillation Kana iyo transmitter ikachinja frequency, anogamuchira anorasikirwa nekusangana neanotumira uye kugamuchira ruzivo rusina kukwana.

 

Chinoshanda sei?

 

Iyo huru oscillator mune AM transmitter inogadzira yakagadzikana sub-harmonic inotakura frequency. Iyo crystal oscillator inoshandiswa kugadzira iyi yakagadzikana sub-harmonic oscillation. Mushure meizvozvo, iyo frequency inowedzerwa kune inodiwa kukosha kuburikidza neiyo harmonic generator. Iyo inotakura frequency inofanira kunge yakagadzikana zvakanyanya. Chero shanduko mune iyi frequency inogona kukonzera kukanganisa kune dzimwe nhepfenyuro. Nekuda kweizvozvo, iye anogamuchira anogashira zvirongwa kubva kune akawanda transmitters.

 

Tuned amplifiers inopa yakakwira yekupinza impedance pane main oscillator frequency ndeye buffer amplifiers. Inobatsira kudzivirira chero shanduko mumutoro wezvino. Nekuda kweiyo yakakwira yekupinza impedance pane yekushanda frequency yeiyo main oscillator, shanduko hadzina kukanganisa iyo huru oscillator. Naizvozvo, iyo buffer amplifier inotsaura iyo huru oscillator kubva kune mamwe nhanho kuitira kuti kurodha mhedzisiro usachinje frequency yeiyo huru oscillator.

 

RF Power Amplifier Test Bench: Chii uye Mashandiro Ainoita

 

Izwi rekuti "bhenji rekuyedza" rinoshandisa mutauro wekutsanangura zvehardware mudhizaini yedhijitari kutsanangura kodhi yebvunzo inomisikidza iyo DUT uye inomhanyisa bvunzo.

 

Kwayedza Bench

 

Bhenji rekuyedza kana bhenji rebasa inzvimbo inoshandiswa kuratidza chokwadi kana hutsanana hwedhizaini kana modhi.

 

Iro izwi rakatanga mukuyedzwa kwemidziyo yemagetsi, uko mainjiniya aigara pabhenji rerabhu, achibata kuyerwa uye maturusi ekushandisa senge oscilloscopes, multimeters, ironing iron, wire cutters, nezvimwewo, uye nemaoko kuona iko kurongeka kwechishandiso chiri mukuedzwa. (DUT).

 

Muchirevo che software kana firmware kana hardware engineering, bhenji rekuedza inzvimbo umo chigadzirwa chiri pasi pekugadzirwa chinoedzwa nerubatsiro rwe software uye hardware zvishandiso. Mune zvimwe zviitiko, software ingangoda zvigadziriso zvidiki kuti ishande ne testbench, asi nekungwarira kukodha kunovimbisa kuti shanduko dzinogona kugadzirisika nyore uye hapana tsikidzi dzinounzwa.

 

Imwe chirevo che "test bed" inzvimbo yakasarudzika, inodzorwa, yakafanana neyakagadzirwa nharaunda, asi hapana kuvanza kana kuoneka kuvanhu, vatengi, etc. Naizvozvo zvakachengeteka kuita shanduko sezvo pasina mushandisi wekupedzisira anobatanidzwa.

 

RF Chishandiso chiri pasi peMuedzo (DUT)

 

Mudziyo uri pasi pekuyedzwa (DUT) mudziyo wakaedzwa kuona mashandiro uye hunyanzvi. DUT inogona zvakare kuve chikamu chemodule hombe kana unit inonzi unit under test (UUT). Tarisa kuDUT kuti uone kukanganisa kuti uone kuti mudziyo uri kushanda nemazvo. Muedzo wakagadzirirwa kudzivirira zvishandiso zvakakanganisika kuti zvisasvike kumusika, izvo zvinogona zvakare kuderedza mutengo wekugadzira.

 

Mudziyo uri mukuedzwa (DUT), unozivikanwawo semudziyo uri muyedzo (EUT) uye yuniti iri pasi pekuyedzwa (UUT), inogadzirwa yekuongorora chigadzirwa iyo inoedzwa payakatanga kugadzirwa kana kuti gare gare muhupenyu hwayo kutenderera sechikamu chekuenderera kunoshanda kuyedzwa. uye calibration. Izvi zvinogona kusanganisira bvunzo dzepashure pekugadzirisa kuti uone kana chigadzirwa chichiita kune yekutanga chigadzirwa.

 

Mune semiconductor bvunzo, mudziyo uri muyedzo unofa pane wafer kana chikamu chekupedzisira chakapetwa. Uchishandisa iyo yekubatanidza sisitimu, batanidza zvikamu kune otomatiki kana manual test equipment. Midziyo yekuyedza inozopa simba chikamu, inopa masaini ekusimudzira, uye zviyero uye inoongorora kubuda kwemidziyo. Neiyi nzira, muongorori anoona kana icho chishandiso chiri pasi pekuyedzwa chinosangana nezvinodiwa.

 

Kazhinji, iyo RF DUT inogona kuve yedunhu dhizaini nechero musanganiswa uye nhamba yeanalog uye RF zvikamu, transistors, resistors, capacitors, nezvimwewo, yakakodzera kutevedzera neAgilent Circuit Envelope Simulator. Zvimwe zvakaoma RF maseketi zvinotora nguva yakawanda kutevedzera uye kushandisa imwe ndangariro.

 

Testbench simulation nguva uye ndangariro zvinodiwa zvinogona kufungidzirwa semusanganiswa webenchmark testbench kuyerwa nezvinodiwa zveiyo yakapfava RF dunhu pamwe nedunhu envelopu yekutevedzera zvinodiwa zveRF DUT yekufarira.

 

Iyo RF DUT yakabatana kune isina waya yekuyedza bhenji inogona kazhinji kushandiswa nebhenji rekuyedza kuita zviyereso zvekutanga nekuseta bhenji rekuyedza paramita. Default kuyerwa paramende marongero anowanikwa kune yakajairwa RF DUT:

 

• Inopinza (RF) siginecha ine redhiyo frequency inotakura frequency inodiwa. Iko kubuda kwebhenji rekuyedza RF siginecha sosi haiburitse chiratidzo cheRF iyo RF inotakura frequency inosiyana nenguva. Nekudaro, bhenji rekuyedza rinotsigira chiratidzo chinobuda chine RF inotakura chikamu uye frequency modulation, iyo inogona kumiririrwa neakakodzera I uye Q envelopu shanduko pane inogara RF inotakura frequency.
• Chiratidzo chinobuda chine chinogara RF chinotakura frequency chinogadzirwa. Chiyero chebhenji chekupinza chiratidzo hachifanirwe kunge chine mutakuri frequency ayo frequency inosiyana nekufamba kwenguva. Nekudaro, bhenji rekuyedza rinotsigira masiginecha ekuisa ane RF mutakuri wechikamu ruzha kana inosiyana-nguva Doppler shanduko yeRF inotakura. Aya masaini enyonganiso anotarisirwa kumiririrwa neakakodzera I uye Q hamvuropu shanduko pane inogara RF inotakura frequency.
• Chiratidzo chekupinza kubva kune jenareta yechiratidzo ine 50-ohm sosi kuramba inodiwa.
• Chiratidzo chekupinza chisina spectral mirroring chinodiwa.
• Gadzira chiratidzo chinobuda chinoda chekunze chinodzivirira che50 ohms.
• Inoburitsa chiratidzo chinobuda pasina spectral mirroring.
• Vimba nebhenji rekuyedza kuita chero kuyerwa-kwakanangana nebhendi chiratidzo kusefa yeRF DUT inobuda chiratidzo.

 

AM Transmitter Basics Iwe Unofanirwa Kuziva

 

Chifambiso chinoburitsa chiratidzo che AM chinonzi AM transmitter. Aya ma transmitters anoshandiswa mune yepakati wave (MW) uye mapfupi wave (SW) frequency mabhendi eAM kutepfenyura. Iyo bhendi yeMW ine mafrequency ari pakati pe550 kHz ne1650 kHz uye bhendi reSW rine mafambiro kubva pa3 MHz kusvika 30 MHz.

 

Iwo marudzi maviri e AM transmitters anoshandiswa zvichibva pamagetsi ekufambisa ndeaya:

 

1. yakakwira
2. yakaderera mwero

 

Madhiri epamusoro-soro anoshandisa yakakwirira-level modulation, uye yakaderera-level transmitters inoshandisa yakaderera-level modulation. Sarudzo pakati peaya maviri modulation zvirongwa zvinoenderana nesimba rekutumira re AM transmitter. Mumatapfenyuro ane simba rekufambisa rinogona kunge riri pahurongwa hwekilowatts, kukwidziridzwa kwepamusoro kunoshandiswa. Mumagetsi akaderera-simba anongoda mashoma mawatts emagetsi ekufambisa, yakaderera-level modulation inoshandiswa.

 

High uye yakaderera-level transmitters

 

Mufananidzo uri pazasi unoratidza dhizaini dhizaini yeakakwira-level uye yakaderera-level transmitters. Musiyano wekutanga pakati peaya maviri transmitters isimba rekusimudzira remutakuri uye modulated masaini.

 

Mufananidzo (a) unoratidza dhizaini dhiyagiramu yepamberi AM transmitter.

 

Mufananidzo (a) wakadhirowewa kuitira kutapurirana odhiyo. Mukufambiswa kwepamusoro-soro, simba remutakuri uye masaini akagadziridzwa anowedzerwa asati aiswa kune modulator nhanho, sezvakaratidzwa mumufananidzo (a). Mukudzika-level modulation, simba remasaini maviri ekuisa kune modulator nhanho harina kukwidziridzwa. Simba rinodiwa rekufambisa rinowanikwa kubva padanho rekupedzisira remutapuri, iyo Kirasi C simba amplifier.

 

Zvikamu zvemufananidzo (a) ndezvi:

 

1. Mutakuri Oscillator
2. Buffer Amplifier
3. Frequency Multiplier
4. Power Amplifier
5. Sravana Sameeralu Serial XNUMXth Audio Chain
6. Modulated Kirasi C Simba Amplifier
7. Mutakuri Oscillator

 

Inotakura oscillator inogadzira chiratidzo chekutakura muredhiyo frequency renji. Kuwanda kwemutakuri kunogara kwakakwira. Sezvo zvakaoma kuburitsa ma frequency akakwira ane yakanaka frequency kugadzikana, anotakura oscillator anogadzira ma submultiples ane anodiwa anotakura frequency. Iyi sub-octave inowedzerwa neiyo nhanho yekuwedzera kuti uwane inodiwa inotakura frequency. Zvakare, crystal oscillator inogona kushandiswa panguva ino kugadzira yakaderera-frequency carrier ine yakanakisa frequency kugadzikana. Iyo frequency multiplier nhanho inozowedzera iyo inotakura frequency kune yayo yainoda kukosha.

 

Buffer Amp

 

Chinangwa chebuffer amplifier chakapetwa kaviri. Iyo inotanga kuenderana nekubuda kweiyo impedance yeanotakura oscillator neiyo impedance yekupinza yeiyo frequency multiplier, nhanho inotevera yeanotakura oscillator. Iyo inobva yaparadzanisa inotakura oscillator uye frequency multiplier.

 

Izvi zvinodikanwa kuitira kuti iyo yakawanda irege kutora mafungu makuru kubva kune inotakura oscillator. Kana izvi zvikaitika, kuwanda kwemutakuri oscillator hakuzove kwakagadzikana.

 

Frequency Multiplier

 

Iyo sub-yakapetwa frequency yechiratidzo chekutakura chinogadzirwa neanotakura oscillator ikozvino inoshandiswa kune frequency multiplier kuburikidza nebuffer amplifier. Iyi nhanho inozivikanwawo se harmonic jenareta. Iyo frequency multiplier inoburitsa yakakwira harmonics yeanotakura oscillator frequency. A frequency multiplier idunhu rakagadziridzwa iro rinonongedza kune inotakura frequency inoda kufambiswa.

 

Simba Amp

 

Simba rechiratidzo chekutakura rinobva rawedzerwa muchikamu chemagetsi amplifier. Ichi chinhu chakakosha chinodiwa chepamusoro-level transmitter. Kirasi C magetsi amplifiers inopa yakakwirira-simba ikozvino pulses yemutakuri wechiratidzo pane zvavanobuda.

Sravana Sameeralu Serial XNUMXth Audio Chain

 

Chiratidzo chekuteerera chinotumirwa chinowanikwa kubva kumakrofoni sezvakaratidzwa mumufananidzo (a). Iyo yekuteerera mutyairi amplifier inokwidziridza voltage yechiratidzo ichi. Uku kukwidziridzwa kunodiwa kutyaira odhiyo simba amplifiers. Tevere, Kirasi A kana Kirasi B simba amplifier inokudza simba reiyo odhiyo chiratidzo.

 

Modulated Kirasi C Amplifier

 

Iyi ndiyo nhanho yekubuda kweiyo transmitter. Iyo modulated odhiyo chiratidzo uye mutakuri siginecha inoiswa kune ino modulation nhanho mushure mekusimudzira simba. Iyo modulation inoitika panguva ino. Iyo Kirasi C amplifier zvakare inokwidziridza simba reiyo AM siginecha kune yakawanazve yekufambisa simba. Ichi chiratidzo chinozopedzisira chapfuudzwa kune antenna, iyo inopenya chiratidzo munzvimbo yekufambisa.

 

Mufananidzo (b): Low-Level AM Transmitter Block Diagram

 

Iyo yakaderera-level AM transmitter inoratidzwa muFigure (b) yakafanana neyepamusoro-level transmitter kunze kwekuti simba remutakuri uye masaini masaini haana kukwidziridzwa. Aya masaini maviri anoiswa akananga kune modulated Kirasi C simba amplifier.

 

Iyo modulation inoitika mukati mechikamu ichi, uye simba reiyo modulated siginecha inokwidziridzwa kune inodiwa yekufambisa simba level. Iyo antenna inotumira inobva yatumira chiratidzo.

 

Kubatanidzwa kwechikamu chekubuda uye antenna

 

Iyo yekubuda nhanho yeiyo modulated kirasi C simba amplifier inodyisa chiratidzo kune inotamisa antenna. Kuendesa yakakwira simba kubva padanho rekubuda kuenda kune antenna, iyo impedances yezvikamu zviviri izvi inofanirwa kuenderana. Kune izvi, network inoenderana inodiwa. Mutambo pakati pezviviri izvi unofanirwa kuve wakakwana pane zvese zvekutumira ma frequency. Sezvo kuenzanisa pama frequency akasiyana kuchidikanwa, inductors uye capacitors anopa akasiyana impedances pama frequency akasiyana anoshandiswa mune inoenderana network.

 

Manetiweki anofananidzira anofanirwa kugadzirwa pachishandiswa izvi zvingori zvinhu. Sezvinoratidzwa mumufananidzo (c) pazasi.

 

Mufananidzo (c): Dual Pi inoenderana network

 

Iyo inofananidza network inoshandiswa kubatanidza iyo transmitter yekubuda nhanho uye antenna inonzi mbiri π network. Iyo network inoratidzwa muFigure (c). Iyo ine maviri inductors L1 uye L2 uye maviri capacitors C1 uye C2. Hukoshi hwezvinhu izvi zvinosarudzwa kuitira kuti iyo impedance yekupinza yetiweki iri pakati pe1 ne1'. Mufananidzo (c) unoratidzwa kuti uenderane neiyo impedance yekubuda kweiyo transmitter yekubuda nhanho. Uyezve, iyo inoburitsa impedance yetiweki inofanana nekukanganisa kweantenna.

 

Iyo yakapetwa kaviri π inofananidzira network zvakare inosefa kunze zvisingadiwe frequency zvikamu zvinoonekwa pakubuda kwechikamu chekupedzisira cheiyo transmitter. Kubuda kweiyo modulated Kirasi C simba amplifier inogona kunge iine yakanyanya kusada epamusoro harmonics, seyechipiri neyechitatu harmonics. Iyo frequency mhinduro yetiweki inofananidzwa inoiswa kuramba zvachose aya asingadiwe epamusoro maharmonics uye chete chiratidzo chinodiwa chinosanganiswa kune antenna.