Astatic D104 Amp and Eq for Ham Radio [VIDEO]

Sometimes I just come across some real cool videos when I’m not trying. This is one of those times. It’s surprising how many good videos are on YouTube and just don’t make it to my suggestion area on the front page of my profile. I think YouTube needs to work on that algorithm. From the description in the video…

This video describes the microphone preamp and equalizer that I designed in 1999 to use with my Astatic D-104 microphone with my ham radio. The D-104 suffers from two issues when used with modern ham radios – impedance mismatch and non-ideal frequency response. The circuit addresses both of these issues. The video briefly describes the circuit, it’s frequency response, and demonstrates the bass and treble adjustments using an oscilloscope and signal generator.


Rich also writes a Tech blog and posts stories every Tuesday and Thursday on Q103, The Rock of Albany’s website, as well as Amateur Radio stories every Monday thru Friday on AmiZed Studios and hosts a podcast called The Kim & Rich Show with his fiance’ Kim Dunne.

Rich Gattie, KB2MOB, is a regular contributor to and writes from New York, USA. Contact him at [email protected].

One Response to “Astatic D104 Amp and Eq for Ham Radio [VIDEO]”

  • John Yochom KB3KEM:

    Rich, I have an astatic model 10-c mic that has the same problem as the D-104. I cant view the video as my Windows 98 sec computer wont run u tube.
    Any chance that I can get the tech info on e mail or other way?
    Thanks for your interest. 73

    John KB3KEM

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