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Re: [softrock40] Push to talk or key input in a simple SDR transceiver

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  • Robert McGwier
    The Delta 44 running your WDM-KS or ASIO interface is 4 gazinta and 4 gazoutas. Bob N4HY ... -- AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
    Message 1 of 6 , Feb 28, 2006
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      The Delta 44 running your WDM-KS or ASIO interface is 4 gazinta and 4
      gazoutas.

      Bob
      N4HY


      Alex, VE3NEA wrote:
      > Hi Tony,
      >
      > It is not clear from your posting what the purpose of telling the
      > software about the RX/TX state is. Generation of the I/Q TX signal is
      > not a CPU-intensive task, and the program can do it continuously. The
      > hardware switch will just enable or disable the TX mixer when the PTT
      > button is pressed/released. I agree with Guido that two sound cards
      > are required in the transmit mode - we need two lines for the I/Q
      > output, and at least one other line for the sidetone signal. One
      > cannot use the software keyer if he cannot hear what he sends!
      >
      > The answer to your question about the speed of your solution is no,
      > this is not going to be fast enough for QSK. I expect the roundtrip
      > time to be on the order of 100 ms, counting the delay introduced by
      > the filter that will extract the tone from the I/Q signal.
      >
      > 73 Alex VE3NEA
      >
      >
      >


      --
      AMSAT VP Engineering. Member: ARRL, AMSAT-DL, TAPR, Packrats,
      NJQRP/AMQRP, QRP ARCI, QCWA, FRC. ARRL SDR Wrk Grp Chairman
      Laziness is the number one inspiration for ingenuity. Guilty as charged!
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