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RE: [softrock40] Re: Changing crystals

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  • W6OM
    Thanks Ed, I found the 15.2 MHz crystal on Bry Carlings web site and just purchased it. That should work out to 3.800 and give me plenty of headroom for the
    Message 1 of 6 , May 29, 2010
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      Thanks Ed, I found the 15.2 MHz crystal on Bry Carlings web site and just  purchased it.   That should work out to 3.800 and give me plenty of headroom for the sound card on both side of 3.800 MHz.

       

      I appreciate you letter.

       

       

      73's,   Ron  W6OM

       

      WWW.AMI-WEST.COM

       

      From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of sdrcrazed
      Sent: Saturday, May 29, 2010 11:14 AM
      To: softrock40@yahoogroups.com
      Subject: [softrock40] Re: Changing crystals

       

       

      Search eBay for 15 mhz crystal.  I see a 15.5700 MHZ that will give you a center freq of 3.8925.  There are probably others there that are higher if you look enough.

      Ed KT6F
      SDRbuzz.com


      --- In softrock40@yahoogroups.com, "W6OM" <w6om@...> wrote:
      >
      > Thanks Bob
      >
      >
      >
      > Good advice, OK I will look for a 15.2 MHz crystal which will come out to
      > 3.800 and give the sound card enough headroom to go up and down the band a
      > bit.
      >
      >
      >
      > OK, now for research to find one.
      >
      >
      >
      > Cheers
      >
      >
      >
      >
      >
      > 73's, Ron W6OM
      >
      >
      >
      > WWW.AMI-WEST.COM
      >
      >
      >
      > From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On
      > Behalf Of g8voip
      > Sent: Saturday, May 29, 2010 8:29 AM
      > To: softrock40@yahoogroups.com
      > Subject: [softrock40] Re: Changing crystals
      >
      >
      >
      >
      >
      > Hi Ron,
      >
      > The LiteII RX uses a crystal at x4 the centre frequency, so you would for
      > 3.900MHz you would be looking for something around 15.6MHz.
      >
      > The problem is getting cheap off the shelf common crystals to cover the
      > required frequencies. Looking at a current catalogue there does not seem to
      > be anything readily available between 15MHz and 16MHz. Both of those end up
      > either a little too low or high and do not allow you to reach the frequency
      > you want to listen to when using 96kHz sampling.
      >
      > You could get a custom crystal made, but get it cut so that the centre
      > frequency is perhaps 15kHz away from the frequency you wish to listen for,
      > to avoid any centre frequency noise.
      >
      > 73, Bob G8VOI
      >
      > --- In softrock40@yahoogroups.com <mailto:softrock40%40yahoogroups.com> ,
      > "RonW" w6om@ wrote:
      > >
      > > I have the most recent version of the Softrock 80 meter receiver which I
      > would like to move up into the high end of 75 meters SSB, around 3.900.
      > >
      > > Does anyone know the appropriate crystal frequency required and how to go
      > about getting one?
      > >
      > > 73's to all
      > >
      > > Ron W6OM
      > >
      >
      >
      >
      >
      >
      >
      >
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