xov xwm

Raws li kev nyiam nyiam, xov tooj cua amateur tau ntev tau txhawb kom sim nrog txhua yam koj yuav muaj ntawm tes. Thaum [Tom Essenpreis] xav siv nws 14 MHz kav hlau txais xov sab nraud ntawm nws qhov kev tsim ntau zaus, nws paub tias nws xav tau ib qho impedance txuam Circuit Court. Hom ntau tshaj plaws yog L-Match Circuit Court, uas siv cov capacitors sib txawv thiab sib txawv inductors los kho qhov siv tau ntau zaus (resonance) ntawm tus kav hlau txais xov. Txawm hais tias tsis muaj txiaj ntsig hauv qee qhov kev teeb tsa tshwj xeeb, lawv yog qhov zoo ntawm kev txuas qhov sib txawv ntawm 50 ohm impedance ntawm lub xov tooj cua thiab tsis paub impedance ntawm tus kav hlau txais xov.
Tsis muaj qhov tsis ntseeg, [Tom] tab tom nrhiav cov khoom hauv nws lub thoob khib nyiab, siv cov ferrite rods, cov kua nplaum kub, hlau nplaum, daim kab xev tooj liab thiab qee qhov ntxiv 60 ml syringes los ntawm AM xov tooj cua los sib sau ua ke cov capacitors thiab inductors sib txawv. Ua ke. Koj tuaj yeem pom nws zom tawm ntawm qhov nruab nrab ntawm lub plunger los ua chaw rau tus pas nrig ferrite. Qhwv rau sab nraud ntawm lub syringe nrog cov xov hlau electromagnetic, qhov kev npaj ntawm cov ferrite tuaj yeem hloov kho los ntawm lub plunger, thiab cov yam ntxwv ntawm cov khoom tuaj yeem hloov kho rau hauv Circuit Court. [Tom] tau tshaj tawm tias nws muaj peev xwm siv nws cov tuner uas tau tsim tshiab rau kev tshaj tawm nyob, thiab peb paub tseeb tias nws nyiam siv nws cov cuab yeej improvised.
Yog tias koj tsis nyiam lub xov tooj cua nyiam ua haujlwm, tej zaum peb tuaj yeem nyiam koj nrog lub foob pob hluav taws-raws li lub foob pob hluav taws, syringe-driven 3D luam ntawv laum xovxwm, lossis lub tshuab nqus tsev twj tso kua mis-tsav dragster. Koj puas muaj koj tus kheej hacker los qhia? Txawm li cas los xij, xa nws mus rau txoj kab tam sim!
Kuv tsis yog HAM thiab kuv tsis paub ntau txog HF, tab sis kuv paub tias hauv qee qhov zaus, TX lub zog yuav loj, yog li qhov hluav taws xob ntawm lub kav hlau txais xov yuav loj. Nws puas tuaj yeem yog qhov zoo rau kev teeb tsa lub raj yas uas tsis yog-conductive uas muaj huab cua nruab nrab ntawm lub kav hlau txais xov tuner thiab cov cuab yeej tswj hwm?
Nws tau hais txog qee qhov teeb meem txog kev tsis muaj peev xwm, uas tsis yog teeb meem. Kuv nco qab hauv phau ntawv los ntawm Doug Demaw uas nws tau thov tias ferrites thaum kawg coj zoo li huab cua ntawm ntau zaus.
Kuv siv cov pas nrig ferrite hauv 80m hma liab transmitter (3.5MHz). Piv nrog rau ferrite sib tov ntawm haum zaus, qhov poob yog nyob rau hauv qhov ntau ntawm 5 dB.
Qhov no mysterious American electromagnetic hlau uas kuv pom hauv Is Taws Nem yog dab tsi, thiab nws muaj dab tsi nrog cov hlau nplaum? Puas yog ua los ntawm steel?
Cov hlau nplaum hlau yog tooj liab hlau nrog ib txheej nyias insulating enameled. Kuv twv nws yog lub npe no vim nws feem ntau yog siv los ua electromagnetic coils, uas yog, rau lub cev muaj zog windings / hais lus lub suab coils / solenoids / winding inductors / thiab lwm yam.
Los yog, yog tias koj tsis muaj lub koob txhaj tshuaj, qee cov khoom siv corflute / coroplast tuaj yeem siv los ua lub kauj qub thiab cov ferrite slips rau hauv nws. Yog xav paub ntxiv, thov mus saib: https://www.youtube.com/watch?v=NyKu0qKVA1I
Los ntawm kev siv peb lub vev xaib thiab cov kev pabcuam, koj pom zoo meej rau qhov chaw ntawm peb qhov kev ua tau zoo, kev ua haujlwm thiab kev tshaj tawm cov ncuav qab zib. kawm ntxiv