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Discussion in 'Amplitude Modulation - AM Fans' started by W7TFO, Mar 9, 2017.

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  1. KM1H

    KM1H Ham Member QRZ Page

    A man after my own heart, my first amp used a wood frame and bakelite panels and then I learned about TVI...in 1957.

    Love the ubiquitous B&W turns counter.

    Carl
     
  2. AC0OB

    AC0OB Subscriber QRZ Page



    Not all transmitters use PWM.

    The Harris DX series uses digital modulation:

    "The Harris DX Transmitters series, introduced in 1986, have proven to be the most efficient
    method of Amplitude Modulation at medium and long wave frequencies. The DX transmitters
    use solid state class D amplifiers utilizing MOSFET switching transistors, and through the design,
    power levels are almost unlimited.

    The DX transmitters use many redundant class D, full-quad switching amplifiers that switch at
    the RF frequency. The quantity of amplifiers that are enabled at any moment depends on the carrier
    power and the modulating audio...."


    Phil
     

    Attached Files:

  3. K8ERV

    K8ERV Ham Member QRZ Page

    Thy wish is granted.

    TOM K8ERV Montrose Colo
     
    WA3VJB likes this.
  4. KG6UTS

    KG6UTS Ham Member QRZ Page

     
  5. W7TFO

    W7TFO Premium Subscriber QRZ Page

    If you need any iron...

    73DG
     

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