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ELFORUM - Forumul electronistilor

PL 504

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Aici o schema dedicata cu PL504:http://www.qsl.net/yo5ofh/projects/25w_qro.pdf

Aceasta e schema pe care am testat-o si scoate 30W curati in 27MHz :rade: O mica constatare practica: cu 3 sectiuni de 500 pF in paralel pentru primul condensator din filtru, sigur nu se poate face acordul corect in 27MHz sau mai sus. Eu am incercat initial cu doua (oricum nu aveam variabil triplu) si doar in pozitia "total deschis" se acorda cat de cat, pana la urma am lasat doar una si abia atunci a fost ok. Probabil capacitatea parazita a 2-3 sectiuni paralel este mai mare decat capacitatea necesara acordului la frecvente spre 30MHz si de aici problemele. Cele 3 sectiuni paralel sunt utile in benzile de jos.
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