Se utilizeaza doua sisteme, atit pentru acordul antenelor cum sint cele de tip Zeppelin sau Levy, cit si pentru cuplarea corecta a radioemitatorului la linia de alimentare. Primul tip de…
Este bine ca inainte de a stabili tipul de antena pe care vrem sa-l construim, sa citim cu atentie acest capitol. Pierderile in antene pot fi impartite in cinci categorii.…
Asemenea linii de alimentare se folosesc frecvent in practica radioamatorilor in undele scurte si ultrascurte, respectiv: cabluri coaxiale cu impedanta 52, 60 sau 75 Ω, cabluri panglica bifilare cu impedanta…
Foarte frecvent se folosesc pentru cuplarea liniei de alimentare cu radioemitatorul schemele cu filtru π, care prezinta urmatoarele avantaje: — Permit acordarea liniilor de alimentare ale caror dimensiuni prezinta abateri…
Liniile de alimentare acordate fiind simetrice fata de pamint, stabilirea legaturii lor cu etajele* de iesire simetrice la radioemi- tatoare se face relativ simplu, ca in fig. 276 a, iar…
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