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Explaination of 144 MHz PA with MRF317 amplifier

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rishi_azzuris

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explanation of circuit

hi everybody


i'm goin to built this amplifier. i hope anybody out there could help me by telling me what is the function and use of the vhf choke and every other components on this circuit. i need a detail explanation on the functions of component and how this circuit works. thank you so much
 

Re: explanation of circuit

Make a schematic. Then it should be easy to tell you.
 

Re: explanation of circuit

vhf choke's function is to prevent rf signal influences dc bias circuit so as minimum as possible rf signal power dissipates in dc bias circuit.

C1 and C5 r coupling capacitors, aimed to prevent dc signal (bias) from previous stage enters the stage and dc signal at current stage enters next stage.

L1-C2-C3 and L2-C4 are transistor's matching impedances
Dr1, Dr3, Dr2 r VHF choke

R1 : bias resistance
D1 : voltage regulator, to minimize effect of powersupply's ripple on transistor base's bias

C6 : decoupling capacitor
 

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