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receptor frecv. f joase


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Guest thiou

buna seara!!!cine ma poate ajuta cu un sfat,o informatie...???doresc sa construiesc un receptor VLF,pentru receptia semnalelor naturale,dar pb e ca nu stiu exact in ce consta acest receptor!!am vazut niste scheme pe net,aparent simple,dar nu au c.v bobina...seamana cu un amplificator...!Dintr-un receptor cu conversie directa(am unul)pot face un receptor vlf?multumesc!!

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Domeniul frecventelor audio urca pana 20 kHz(aproximativ) ,mai sus este domeniul ultrasunetelor care cred ca te intereseaza.Cine stie mai bine ar putea da niste detalii.

 

Faceti o confuzie grava intre spectrul oscilatiilor mecanice(infrasunete, sonore, ultra si hipersunete) si spectrul electromagnetic.

4KHz electromagnetic nu inseamna ca e audibil, tot asa cum un sunet de 4 KHz scos de o trompeta nu da nastere nici unei unde electromagnetice, ci doar unei unde sonore.

Varianta loop antena+ preamplificator e cea mai buna. Am facut varianta din "300 circuite...Teora" si merge perfect.

 

http://www.qsl.net/dl4yhf/vlf_rdf/vlf_rdf_loop.html

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