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Re: Big signal at 0 Hz even with SR40 is off

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  • n3hkn
    Spread Spectrum... CPU=AMD 2600 ECS is motherboadr mfg. KT-600 Dick N3HKN It is about 2 years old--- In softrock40@yahoogroups.com, Sam Morgan ... PC ...
    Message 1 of 21 , Oct 2, 2006
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      Spread Spectrum...

      CPU=AMD 2600
      ECS is motherboadr mfg. KT-600

      Dick N3HKN


      It is about 2 years old--- In softrock40@yahoogroups.com, Sam Morgan
      <ka5oai@...> wrote:
      >
      > n3hkn wrote:
      > > I switched off the spread pectrum BIOS option in my "home made"
      PC
      > > and the width of the noise spike is now vey narrow. Looks like
      almost
      > > a single frequency carrier.
      > >
      > just curious, how new is your motherboard? I guess if u told me
      what cpu it's
      > running that might also help. I'm thinking everything I have it to
      old, I don't
      > remember seeing anything like that in the settings on any of them.
      >
      > --
      > GB & 73's
      > KA5OAI
      > Sam Morgan
      >
    • Sparkes, John
      Yep, same here. Big peak at 0 with no inputs to D44. Totally goes away when 9V battery powered SR40V6 on-line. John JX________________________________From:
      Message 2 of 21 , Oct 2, 2006
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        Yep, same here. Big peak at 0 with no inputs to D44. Totally goes away when 9V battery powered SR40V6 on-line.
         
        John JX


        From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of Mike
        Sent: Sunday, 1 October 2006 00:41
        To: softrock40@yahoogroups.com
        Subject: [softrock40] Re: Big signal at 0 Hz even with SR40 is off

        The big signal is 60 Hz pickup. The solution is isolation transformer
        (s), in the audio lines and/or at the antenna connection. Running on
        battery can help to, or a non-grounded power cube. These will help to
        reduce the mountain at the center but may not eliminate it entirely.

        73 - Mike WA8BXN

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