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4266Re: Balanced Antenna Amplifiers

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  • jr_dakota
    Nov 19, 2007
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      As always nice work Chris

      How about a U-310, they are supposed to be better than a J-310 even
      though they use a similar die, I'm curious just how much better

      BTW, love that curve tracer ....

      JR

      --- In loopantennas@yahoogroups.com, "Chris Trask" <christrask@...> wrote:
      >
      > About a year ago we had a lengthy discussion about active antenna
      > amplifiers, and someone posted a URL for a balanced amplifier that had a
      > pair of JFETs followed by a pair of NPNs. I think it had four
      varactors for
      > tuning. I remember having made a comment about adding a transformer
      between
      > the JFETs and the NPNs to improve the gain and the even-order
      distortion.
      > Somehow, I mananged to misplace that schematic and would like to ask
      if the
      > person who earlier made that avialable would do so again.
      >
      > Chris
      >
      > ,----------------------. High Performance Mixers and
      > / What's all this \ Amplifiers for RF Communications
      > / extinct stuff, anyhow? /
      > \ _______,--------------' Chris Trask / N7ZWY
      > _ |/ Principal Engineer
      > oo\ Sonoran Radio Research
      > (__)\ _ P.O. Box 25240
      > \ \ .' `. Tempe, Arizona 85285-5240
      > \ \ / \
      > \ '" \ IEEE Senior Member #40274515
      > . ( ) \
      > '-| )__| :. \ Email: christrask@...
      > | | | | \ '. http://www.home.earthlink.net/~christrask
      > c__; c__; '-..'>.__
      >
      > Graphics by Loek Frederiks
      >
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