Direct Sampling Front End Board

Over on this Japanese language blog, ttrftech has been experimenting on a type of direct sampling front end board (Use Google Translate) for a direct sampled RTL-SDR dongle. More info about his direct sampling front end can be found on this post. Translated, it appears his board has the following feautres.

  • Filter x2 up to fifth order
  • RF switch
  • Amplifier
  • Power regulator
  • Input transformer (optional)
  • The RJ-45 (optional) or the SMA input connector
  • Power supply to the antenna
  • Output to U-FL or SMA (ipex) connector

The results seem to show his board does improve reception. Note that the RJ-45 appears to be the antenna. There also appears to be review of the board by “pup” here and a video showing the board filtering out a broadcast FM image in the video below. On Pups blog there are also more posts about the board under this tag.

ダイレクトサンプリング向けフロントエンド基板の実験①
Direct Sampling Front End
Direct Sampling Front End

One comment

  1. TT

    Thank you for introducing my frontend board here and apologize for inconvenience that this blog was written only in Japanese.
    As another solution for receiving HF with RTL dongle, I have developped a budget frequency converter board and have distributed a few hundreds of the parts kit in Japan. Please refer the following link with google translate.
    http://ttrftech.tumblr.com/kit/hfconv
    Thank you.

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