Pentru a evita perturbarea functionarii liniei coaxiale la frecventele mari (gama de ultrascurte) trebuie ca tronsonul de cablu ce serveste pentru reglarea aparatului sa aiba aceeasi impedanta. In acest scop…
Montajul folosit pentru controlul undelor reflectate si prezentat in fig. 308 nu poate fi folosit decit pentru masurari la puteri foarte reduse si pe durata scurta, deoarece rezistenta R trebuie…
Reglajele de adaptare a impedantei de alimentare cu impedanta liniei se pot face asigurind cel mai mic coeficient de unde reflectate. Determinarea acestui coeficient se poate face cu ajutorul masuratorului…
Se realizeaza cu ajutorul unui masurator de cimp, cum, este cet prezentat in fig. 303, care cuprinde un dipol acordat pe frecventa dorita, completat cu un circuit de masurat cu…
Se poate realiza usor cu ajutorul unui grid-dip-metru. In fig. 300 este data schema unui grid-dip-metru tranzistorizat compus dintr-un oscilator, la care curentul de repaus este influentat de frecventa de…
Pentru a masura impedanta unei antene trebuie sa dispunem de o punte de masurat si un generator de putere mica, cum ar fii un VFO slab, cuplat cu antena prin…
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