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Re: [softrock40] Spikes and Com port

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  • Tony Parks
    Hi Uli, If you have a ground connection from your COM port to the v6.2 board, try disconnecting the COM port ground. PTT should still work properly but it may
    Message 1 of 2 , Nov 29, 2008
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      Hi Uli,
       
      If you have a ground connection from your COM port to the v6.2 board, try disconnecting the COM port ground.  PTT should still work properly but it may help with the spikes you are seeing.
       
      73,
      Tony KB9YIG
       
      ----- Original Message -----
      From: Uli
      Sent: Saturday, November 29, 2008 4:23 AM
      Subject: [softrock40] Spikes and Com port

      Hi,
      I am building Softrock V6.2 transceiver. Now I got a problem:
      After connecting the PTT input to the COM port of my PC I get some
      spikes (abt. 20 dB high) symmetric to the oscillator frequency.

      How can I solve this problem ?
      Optocoupler at this input ?
      If yes, where can I find a schematic ?

      Thanks for your help.

      73
      Uli
      DF5SF

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