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Re: [softrock40] Switching stage of the Ensemble RXTX

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  • Malti
    Thanks Alan for being sincere. The discussion about this stage ends here, 73 s Paul
    Message 1 of 5 , Nov 15, 2012
      Thanks Alan for being sincere.
      The discussion about this stage ends here,



      On 15 November 2012 09:24, Alan <alan4alan@...> wrote:

      ----- Original Message -----
      Subject: Re: [softrock40] Switching stage of the Ensemble RXTX

      >I mean, that if I am  testing voltages for two conditions, RX and TX mode,
      then I should know the voltages, for both, even if the voltages remain the
      same for both conditions .
      Typical cases are voltages at  gate of Q10,  and  junction R35/R51. It is
      very easy to damage the BS170, even with a meter probe. Its not as tough as
      the rugged 2N3819.
      In any case, I am assuming that this stage is working satisfactorily.


      Fault finding and discussing circuit operation can be two different things.
      For example, with R53 simple Oms law says that a relatively big current has to flow through it's 10 ohms to make any significant
      voltage drop across it. But it is not so simple to know what current actually should flow through it. A few months ago there was a
      lengthy debate in this group about what this single resistor actually does.

      Please take your extra measurements, just make it clear whether your questions are because you have a problem or just that you want
      to learn more.
      When I'm busy on other things I'm more inclined to spend time helping people with problems than discussing electronics although
      there is a lot I need to learn.

      73 Alan G4ZFQ


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