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Re: All Band TRF 1948

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  • jj194652
    ... Thanks for that, Bob; that s that cleared up, I guess. Cheers, John
    Message 1 of 11 , Apr 1, 2009
      --- In regenrx@yahoogroups.com, "revex540" <vk7krw@...> wrote:
      >
      > Hi John and other members
      > The replies so far are correct.
      > The 30pF trimmer across the detector is to add capacitance to the circuit for tracking purposes and only needs to be set once.
      > The 35pf trimmer comes out on the front panel and allows the aerial circuit to have slightly more or less capacitance through its tuning range for peaking.
      >
      > The reaction, aerial trim and RF gain controls are fairly critical in their adjustment and all react with each other to some degree so peaking weak signals is a bit of an art.
      >
      > Carl, it appears to be down a bit on sensitivty on the 80M band (the only other coil I have wound) but it may be just a coupling problem. I used larger formers than specified and adjusted the number of turns accordingly but it might need some fine tuning.
      >
      > Thanks for your interest.
      >
      > Bob VK7ZL
      >
      > --- In regenrx@yahoogroups.com, "jj194652" <john1946.jones@> wrote:
      > >
      > > --- In regenrx@yahoogroups.com, "revex540" <vk7krw@> wrote:
      > > >
      > > > I have just completed my All Band TRF receiver taken from a 1948 Radio & Hobbies article.
      > > > It performs very well and has very good sensitivity and selectivity.
      > > >
      > > > Pictures of the finished unit are in the Photo section under VK7KRW along with the circuit diagram and coil winding data.
      > > >
      > > > Bob VK7ZL
      > > >
      > >
      > > Hi Bob,
      > >
      > > This may be a silly question, but how do you get the inductances of the tuned circuits to match? Is it just a case of adding/subtracting windings and/or adjusting the spacing between them?
      > >
      > > Thanks,
      > >
      > > John (another newcomer to regenerative receivers)
      > >
      >
      Thanks for that, Bob; that's that cleared up, I guess.

      Cheers,

      John
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