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problema etaj final 2m yaesu ft5200

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semnalul de iesire este cuplat la emisie de catre o dioda pin, cablajul dintre dioda pin si lpf sa ars, am refacut conexiunile si se incalzeste foarte tare plus ca pe swr vad 30w in loc de 50w dupa care  la 3 secunde de fct incepe si scade puterea,restul statiei fct perfect.care este problema dioda pin? sau etajul final nu inteleg de ce se incinge asa de rau incat a luat foc cablaju.

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