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Re: [softrock40] SR-2 noise floor results

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  • Kees & Sandy
    Sure, here is some work I did 2-1/2 years ago with the SR Lite from the Files section......
    Message 1 of 2 , Jun 5, 2009
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      Sure, here is some work I did 2-1/2 years ago with the SR Lite from the "Files" section......

      73 Kees K5BCQ

      ---------- Original Message ----------
      From: Jeff Blaine <keepwalking188@...>
      To: softrock40@yahoogroups.com
      Subject: [softrock40] SR-2 noise floor  results
      Date: Fri, 05 Jun 2009 20:27:28 -0500

      I have a 30M SR-2 for IF - it's using a 14.060 crystal and the intended
      IF service range is around 10.55 Mhz.

      The SR2 is the standard version with the only optimizations being the
      manual adjustment of the L/C network using an LC meter - the network is
      within about 5% of what I estimate the ideal values at 10.5mhz should be.

      And in front of the SR2 is a Clifton Labratories z10000 buffer/amp with
      a gain of 14db.

      Other equipment in the chain:  Infrasonic Quartet sound card @ 96khz
      sample.  PowerSDR v1.19.

      Feeding a -73dbm signal from an XG2 at 10.545 mhz, the post-calibration
      floor is about -129dbm.

      Without the z10000 amp, the noise floor is around -105dbm to -110dbm.

      Wondered if any of the group had done some noise floor testing so we
      could compare notes???



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