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Thursday, April 9, 2015

The Slaughter of Inductors, Capacitors, and Crystals Continues...


 
Oh the humanity!  Pete Juliano has turned his digital attention to previously completed projects.  Perfectly fine rigs -- whose only crime was that they used LC or crystal (VXO) oscillators -- are now being ARDUINOED by the maniacal Dr. Juliano.  Not even Huff and Puffs will be spared.  This is like the French Revolution!   We hear that Pete has even mastered the art of cutting the square holes that are needed for his "displays," so there is no stopping him now.  

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4 comments:

  1. This comment has been removed by the author.

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  2. I hear a carrier oscillator that needs moving 200 - 300 Hz nearer the suppressed carrier, an xtal filter that needs widening or audio coupling capacitors that need increasing for better low frequency response ;)

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  3. Wow Peter! You are an ESSB guy now!

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  4. Bill - I'm more a 300 Hz - 3kHz guy than ESSB. Pat Hawker discussed optimum SSB frequency ranges in the early days and concluded that was about optimum. Though I don't mind a bit of boost around 1 - 2 kHz with QRP rigs.

    If you've got an Android phone I highly recommend downloading the free FrequenSee audio spectrum analyser app.

    Then hold it against your speaker while listening to Pete's video at https://www.youtube.com/watch?v=UHBLnjwpPCo

    Notice that there's almost no audio below 900Hz but a large spike around 2kHz.

    In contrast my BitX still has that spike but it's more gentle with significant audio energy down to below 500 Hz. Eg https://www.youtube.com/watch?v=pB1IC2qRw6g

    The Beach 40, with no crystal filtering, is flatter again. https://www.youtube.com/watch?v=6AuAVv6gQU0

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