Amp Development and Wide-Band Performance

Hello group,

The current circuit board amp wide-band performance is not correct. I have to investigate the cause and correct. 

This test is with 1W drive from 160–10M. We are looking for a flat dB gain characteristic. Obviously, we are not getting it but I am not discouraged. It is a mystery to solve.

HFSPP V3 Test 12 03 12

I suspect the answer to be found in one of these areas:

  1. Output transformer
  2. Feedback
  3. Input transformer
  4. Layout

73, K5OOR –  Virgil



2 thoughts on “Amp Development and Wide-Band Performance

  1. Dear Virgil,

    I am a great admire of your work and not at least your detailed documentation how such a project for a singel person is made through many small and sometime painful steps.

    I have recently bought a KX3 from Elecraft. I know they plan to make an integrated PA 100 watts. Your project sounds a lot more versatil. Do you plan to interface KX3 as you have planned to do with FT-817?

    oz4wil, Niels Willumsen

    • I am scaling back the first model in terms of cost to make available quicker to a wider audience.
      Thank you for your support!
      K5OOR – Virgil

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