RF amplifier help Coupling and such

Discussion in 'Homework Help' started by Paulo540, Jan 4, 2010.

  1. Paulo540

    Thread Starter Member

    Nov 23, 2009
    188
    0
    Hi,

    been staring at this for a while and wanted to verify a couple things...


    [​IMG]

    First off, I feel that the stages are capacitvely coupled through C5

    Second, Stage 1 is Plate neutralized via C3
    Third, Stage 2 is Grid Nuetralized via C7

    The final question I am doubting myself on...

    What would be the effect of a short in C4?

    A. reduced current to plate on V1
    B. Rf out will be much reduced
    C. Plate supply V will be shorted

    In my mind, if the tank cap is shorted, then its primary result would be to make the output wave all screwy and thus B would be how I would answer.

    I don't see the plate supply getting shorted since there are other caps in the way of that. But the problem is I can't entirely say why A might not happen so hence my apprehension.

    Thanks a lot, I hope that I am at least on the right path with this stuff.


     
  2. LMT51

    New Member

    Jul 6, 2009
    1
    0
    B. Rf out will be much reduced
     
  3. t_n_k

    AAC Fanatic!

    Mar 6, 2009
    5,448
    782
    Hello Paulo540,

    If V1 load was so severely compromised I would think the plate current would rise - for the lack of an effective plate load. So A would not be true. I believe you are are correct regarding answer option C. So B is the logical choice.

    I agree with your other observations regarding the circuit.
     
  4. Paulo540

    Thread Starter Member

    Nov 23, 2009
    188
    0
    Thanks for the verification guys.

    I'm pleased to find I am actually learning this stuff. :)
     
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