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Thread: Amplifier Rework Project

  1. #11
    Orca Whisperer PA5COR's Avatar
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    The cheap method of feeding bias to the transistors/fets from one source can be done if each transistor or fet has it's own temperature tracking and is selected for the gain, so that each transistor will work within that range with the same bias, see the Motorola color dots on the transistors to mark them for selection in your amplifier.

    Certainly with fets I would incorporate temperature tracking for each fet because they are very liable for run away with changing temperature.
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  2. #12
    Conch Master W7XF's Avatar
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    Quote Originally Posted by K7SGJ View Post
    Don't forget to ground the B+
    OK, I'll ground your tail.
    Encrypt everything. Even if you have nothing to hide. It increases the noise floor.

  3. #13
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    Quote Originally Posted by K7SGJ View Post
    Don't forget to ground the B+
    Be careful: Intentional grounding can cause a loss of down and a 10 yard penalty.

  4. #14
    Orca Whisperer W3WN's Avatar
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    Quote Originally Posted by wb5ydk View Post
    Be careful: Intentional grounding can cause a loss of down and a 10 yard penalty.
    Unless you do it within your own end zone.

    Then it's 2 points for the other team, who get the ball back on a free kick.
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  5. #15
    La Rata Del Desierto K7SGJ's Avatar
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    Quote Originally Posted by W3WN View Post
    Unless you do it within your own end zone.

    Then it's 2 points for the other team, who get the ball back on a free kick.
    And most of us know what a kick in the balls will do for you.
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  6. #16
    'Grumpy old bastid' kb2vxa's Avatar
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    I wouldn't worry about biasing, Palomar wasn't one of those basement CB hack outfits, the transistors are matched. I've used plenty of their very high quality equipment and was perfectly satisfied with it, if you look up their history you'll see why. Just don't tell the FCC I used one of their 100W P-P broadband amps driven by a Rat Shack 23 channel rig in the Stereo mobile full time (no switch) and it was clean as the proverbial whistle. Another thing I used occasionally when I got my ham ticket was an FM adapter that plugged into the crystal socket on an AM rig, in this case a Gonset 2M Communicator. That BTW was an interesting adventure, zero beating the SSB stations with the matching VFO I heard them just fine and they didn't know I was transmitting AM until I told them.
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  7. #17
    Lord of the Flies kd6nig's Avatar
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    Quote Originally Posted by wb5ydk View Post
    Be careful: Intentional grounding can cause a loss of down and a 10 yard penalty.
    Not if the defense is the Raiders. They will find them holding or something, count on it.

    I say that as a fan.
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