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Re: Lite III

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  • Doug
    Oops. Should have said Si590. Fat fingered it. Doug
    Message 1 of 20 , Sep 28, 2009
      Oops. Should have said Si590. Fat fingered it.

      Doug

      --- In softrock40@yahoogroups.com, "Doug" <dougwe@...> wrote:
      >
      > Thanks for the info, Bob. I was planning to try to get a 570 and volunteer for Tony's Si570 Lite III beta..no plans to use it on VHF. I was curious what frequency to order from Silicon Labs. My own plans are strictly for HF use with transverters for the higher frequencies.
      >
      > Doug
      > K7IP
      >
      > --- In softrock40@yahoogroups.com, "g8voip" <g8voi.reeves59@> wrote:
      > >
      > > Hi Doug,
      > >
      > > As far as I can see, the Si590 has a similar frequency range to the Si570, i.e 10MHz to 160MHz for the 'C' grade CMOS device.
      > >
      > > Up to 30MHz, you would use the normal 4x quadrature clock frequency, but for 50MHz and above you would still have to use sub-harmonic sampling, i.e. one third for 50MHz and one fifth for 145MHz.
      > >
      > > One point to remember whilst the SoftRock's have adequate sensitivity for HF use, I am not too sure about using them at VHF frequencies, I suspect they will be very much lacking in sensitivity, therefore limiting their use to local strong signals.
      > >
      > > For anyone really interested in VHF operation using a SoftRock receiver, the v9.0 RX with the plug-in VHF converter is a far better option. The use of an active front-end and additional mixer gives it vastly superior performance, comparible to most multimode VHF receivers (transceivers).
      > >
      > > 73, Bob G8VOI
      > >
      > >
      > >
      > >
      > >
      > >
      > > --- In softrock40@yahoogroups.com, "Doug" <dougwe@> wrote:
      > > >
      > > > So, the Si590 frequency should be just 4*CF, not 3*CF/4?.
      > > >
      > > > --- In softrock40@yahoogroups.com, "kb9yig" <kb9yig@> wrote:
      > > > >
      > > > > Good Morning All,
      > > > >
      > > > > Tom Hoflich and I are working on a Lite III design that uses the factory custom programmed Si590 for the clock source.
      > > > >
      > > > > Prototype circuit boards, (sixteen), were received yesterday and a 20m example was built last evening. The Lite III is a quickly built kit although it does include the little SOT-23 3.3 volt regulator on the board.
      > > > >
      > > > > This 20m example is going to Tom who is waiting on 20m samples, (4*20m center frequency), of the Si590. The Lite III should provide about the same receiver performance as the v9.0 receiver with a still to be answered question concerning how much impact the jitter performance of the Si590 will have on receiver performance.
      > > > >
      > > > > The Lite III should be good for up to 10m operation with a 4x clock and 1/3 sub-harmonic sampling to 6m. There is also some interests in testing the Lite III board on 2m using 1/5 sub-harmonic sampling.
      > > > >
      > > > > If any are interested in evaluating the Lite III receiver and can get an Si590 sample, please let me know.
      > > > >
      > > > > Thanks and 73,
      > > > > Tony KB9YIG
      > > > >
      > > >
      > >
      >
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