BROADBAND MULTI-OCTAVE HIGH POWER AMPLIFIER


Posted on Feb 5, 2014

A MOSFET solid state kilowatt amplifierplifier using MOSFET`s. Helge`s work was followed by articles that appeared in QEX and QST by Joel F. Paladino, N6AMG. Since then, very little has been written in amateur radio publications concerning MOSFET`s in kilowatt applications. Most kilowatt amplifier designs published, use vacuum tubes. These amplifiers tend to be bulky and


BROADBAND MULTI-OCTAVE HIGH POWER AMPLIFIER
Click here to download the full size of the above Circuit.

heavy. In this article, I hope to renew interest in high power solid state RF devices. My primary objectives are to revisit the designs, investigate the use of newer devices, and offer a creative implementation of these devices in an amateur radio amplifier. Please keep in mind, this amplifier design is a work in progress. Previously, I contemplated building an amplifier using vacuum tubes. My requirement was for an amplifier in the 1000 Watt class for HF and six meters. In addition, I needed a power device that would handle this requirement. The device that came to mind was a Eimac 8877. I researched a design that would cover HF through Six meters. Every design was either for HF or Six meters, but not for both. In addition, they involved tube technology which I had not worked with in the past. The designs also looked a bit more mechanically complex than I had expected. My idea was to aim for a design that was both portable and straight forward to implement. After weighing the pros and cons, it looked like a solid state design was the only viable option left. But which devices should I use Bipolars or MOSFET`s After a lot of reading, it seemed like MOSFET`s would be the device of choice. I decided to build one of the amplifiers designed by Helge Grandberg of Motorola. I had remembered reading of a design in QST, so I decided to go through all my piles of magazines. I finally found the article in the September 1992 issue....




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    2M Transmitter
    Speaker Protection Circuit Circuit
    Power cipher scheme on the basis of TMS320C6678 DSP
    morning light activated alarm circuit
    LM2876 40W audio power amplifier circuit design
    Low cost temperature data logger using PIC
    Automatic White-LED Garden Light
    One of the positive and negative brake circuit to operate energy



    Top