G8JNJ

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G8JNJ
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  • Wellgood balanced loop amplifier, (Wellbrook clone).

    Hi Ron,

    It's basically two Norton lossless feedback amplifiers connected in a push pull arrangement.

    The winding in the emitter circuit provides negative feedback and the ratio of the windings sets the(more)
    KA7U
  • A Bias-T and active antenna performance

    Hi Ron,

    OK - if that's a problem you need to use much bigger value capacitors :-)

    Regards,

    Martin - G8JNJ
    KA7U
  • Home Brew Broadband Magnetic Loop

    Hi Ron,

    I think you could either center tap the input transformer on the loop side (prefered method), or add two 1K Ohm value resistors (or similar) from either side of the loop / transformer(more)
    KA7U
  • Wellgood balanced loop amplifier, (Wellbrook clone).

    Hi Ron,

    My guess is that you have inadvertently scraped some of the enamel insulation off the transformer winding(s) at some point, as it's very easy to do this.

    I use Kynar insulated wire (the(more)
    KA7U
  • Use CAT6 shielded communications cable for antenna feedline, rotor control, and LNA power

    Hi Ron,

    The LZ1AQ loop amplifier kit uses CAT6 for power, control and signal.



    CAT 5 & 6 has a characteristic impedance of 100 Ohms per(more)
    KA7U