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Momwe Mungapangire Chozungulira Dongosolo Lachitetezo Chozungulira 3KM-5KM?

Ma transmitter a FMUSER FM zakhala zikugwiritsidwa ntchito padziko lonse lapansi kulumikizana. Kuphweka kopangira dera la FM kunapangitsa kuti ikhale yotchuka kwambiri pakati pa njira zina zosinthira. Lero ndabwera ndi kufalikira kwa FM transmitter yomwe ili ndi pafupifupi 3 Km pafupifupi. Chithunzi chojambulachi chinali chachikulu bwino ndipo sindingathe kulingana ndi tsambali. Dinani pa icho kuti muwone chithunzi chachikulu. Tiloleni kuti tigwire ntchito yadera.

FM-transmitter

MUNGATANI KUGWIRA NTCHITO YOTHANDIZA FMUSER FM:

Panali zinthu zambiri komanso magawo mu gawo lino kotero ndizisunga malongosoledwe osavuta momwe ndingathere. Uwu ndi uthenga wabwino wopatsira FM wokhala ndi ma frequency okhazikika omwe amabweretsedwa ndi oscillator wosinthidwa, amene ali oscillator awiri omwe adamangidwa mozungulira Q2 ndi Q3 akugwira ntchito pafupifupi 50MHz mu anti-gawo. Kutulutsa kumatengedwa pamsonkhanowu, pomwe ma frequency a oscillator awiriwo amaphatikizana ndikupanga chizindikiro cha 100MHz. Izi zimapereka bata lalikulu kuposa oscillator amodzi omaliza.

Kusinthaku kumachitika kudzera kawiri varicap D1 / D2 ndi mawonekedwe osiyanitsa a C8. Mwa kusintha mphamvu yosinthira makina pa varicap (malingana ndi cholowetsera mawu) mumasintha mphamvu zawo potengera mphamvu yamagetsi. Izi zimabweretsa kusinthasintha pafupipafupi kwa chikwangwani poikapo. Kutulutsa kwa gawo la oscillator / modulator kumadyetsedwa kwa kalasi A gawo loyendetsa lomwe limapangidwa pogwiritsa ntchito transistor Q4. Chizindikiro chakumaliracho chimalimbikitsidwanso pakudya mu kalasi ya mphamvu yamagetsi C yomangidwa mozungulira Q5.

Tsopano dyetsani mawu otulutsa kuchokera ku Class C kupita pazosefera zotsika zopangidwa ndi angapo capacitors ndi Inductors. Amachita kuti akwaniritse zonunkhira zotsika kwambiri asanatuluke kwa antenna. Ndawonetsera LED D3 yomwe ikuwonetsa kuti mukutumiza ndipo zonse zikuyenda bwino. Ngati LED sikuwunikira ndiye kuti pali cholakwika ndi zoyeserera. Vutoli nthawi zambiri limapezeka mu gawo la oscillator (kungochitira lingaliro). Komanso ndinakwanitsa kuchotsa pafupifupi onse ma capacitor osiyanasiyana koma amodzi oti tikonzeke, chifukwa zoyambirira zoyambirira zinali ndi ma capacitor ochulukirapo ndipo ndizovuta kuti tiwatenge onse.

LANGIZO LABWINO LA FM CIRCUIT:

Mphamvu yakutulutsa chizindikiro mu FM ino ndi 2.5W. Pa 2.5W FM chizindikiro chimatha kuphimba mtunda wa 5 - 7 Km ndi mzere wowoneka bwino. Ndipo pamalo abwino atha kufikira 10km pafupifupi. Chifukwa chake ndikukhulupirira kuti sichingakhale bwino kunena kuti gawo ili likhala ndi 3 Km mulimonse ngakhale pamalonda abwino kwambiri kapena kunja kwakanthawi.

Dongosolo ili linapangidwira makina olandirira aku European FM olandila ngakhale zidzagwiranso ntchito ku America, sindikutsimikiza kuti mtundu wa audio uzikhala womwe. Izi zikuchokera poti ndakhala ndikugwiritsa ntchito preusphasis ya 50us yomwe ndi muyezo waku Europe ndipo USA imagwira ntchito ndi 75us preemphasis.

Malangizo a PCB:

Mukamapanga gawo lino, pali malingaliro ochepa a PCB omwe muyenera kutsatira. Ndikofunikira kwambiri kuti mugwiritse ntchito ndege yanthaka m'malo mwa njanji yapansi pansi poyendetsa dongosolo. Izi zimakulitsa malo a nthaka komanso kukhazikika. Mutha kupanganso balunti musanadye mzere wa chakudya cha antenna polemba matembenukidwe atatu kapena anayi a chingwe cholimba ndi kutalika kwa mainchesi 3. Zotsatira zake zidzapanga msampha wosasunthika wa minda yamagetsi yomwe ikuyenda pamagolosale akunja, ndikutchingira kuti likhale gawo la nyerere, zomwe sizabwino.

Chidwi:

  • Osayambitsa transmitter popanda katundu.
  • Ngati simunalumikizane ndi tinyanga ingoyikani chopumira cha 50ohm pa 2W (kaboni, osati bala la waya) ndikuyesa gawo lanu.

Ndikhulupirira kuti nonse mukufuna ntchitoyi, yesani izi ndikulemba zotsatira zanu. Kwa mafunso chonde gwiritsani ntchito bokosi la ndemanga pansipa, ndingakhale wokondwa kuyankha. Wokongola DIY

Ngati mukufuna kugula a fm wopatsira ndikupanga wailesi, kulandiridwa ndi ine. Injiniya wathu akupereka yankho.

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Siyani Mumakonda