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RE: [softrock40] 2 for 2

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  • Sparkes, John
    Thanks, Steve - that makes more sense now ! John.________________________________From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On
    Message 1 of 5 , Jul 26, 2006
      Thanks, Steve - that makes more sense now !
       
      John.


      From: softrock40@yahoogroups.com [mailto:softrock40@yahoogroups.com] On Behalf Of Steve Ireland
      Sent: Wednesday, 26 July 2006 15:55
      To: softrock40@yahoogroups.com
      Cc: pvharman@...
      Subject: RE: [softrock40] 2 for 2

      Hi John

      What Phil is saying is that the Rocky software is designed not to sample phase and amplitude close to the 0Hz point, as cheap soundcards produce rubbish/spurious responses/aliases close to this.

      The M-Audio D44 is very clean from 0Hz to +/- 5KHz, but this is not true of many cheap cards and Rocky is designed to work with as broad an array of cards as possible.  

      Cheers me old mate

      Steve, VK6VZ


      From: softrock40@yahoogro ups.com [mailto:softrock40@ yahoogroups. com] On Behalf Of Sparkes, John
      Sent: Wednesday, 26 July 2006 1:10 PM
      To: softrock40@yahoogro ups.com
      Subject: RE: [softrock40] 2 for 2

      Phil - if I had that nasty aggregation of noise (the typical "hump") around the middle of my passbands that I've seen on most other guy's bandscope photos, I'd probably agree with you. But mine are clean. Both my 80/40m and 160m SR's only have a very tiny spike (only 2 dB above the noise floor) at zero and a very slight dip in the noise at zero (about -1dB deep and 300Hz wide), so I'm guessing there may be another reason...

      John JX

      P.S I'm using little 9V batteries to power my SRs (not mains power supplies) and a Delta 44 soundcard.  


      From: softrock40@yahoogro ups.com [mailto:softrock40@ yahoogroups. com] On Behalf Of pvharman@arach. net.au
      Sent: Wednesday, 26 July 2006 10:25
      To: softrock40@yahoogro ups.com
      Subject: Re: [softrock40] 2 for 2

      Hi John,

      There is too much noise and other crap near the 0Hz point to do an accurate
      phase and amplitude calculation. Some sound cards are better than others so
      this has to be a compromise.

      73's Phil...VK6APH

      Quoting "Sparkes, John" <john.sparkes@ bhpbilliton. com>:

      >
      > Good morning, gents. I got the 160m SR40V6 going yesterday (bloody
      57
      > turn inductors - sheesh !) and it worked great first pop - just like
      the
      > 80/40m unit I built a few weeks ago. I ran the FT1000 into a dummy
      load
      > across the band and gathered a full book of amplitude and phase
      points -
      > perfect !
      > Thanks a lot, Tony - these little RXs are so
      cool.
      > I've just got one question - why do you not get any amp/phase
      correction
      > points plus or minus about 5kHz of the centre frequency ?
      This
      > phenomenon was seen on the 80 and 40 metre bands as well.
      >

      > John VK6JX
      >

      > P.S The correction curve (the
      bottom one - can't remember if that's amp
      > or phase !) for the 160m SR
      were very pretty - kind of wavy with about
      > an 8kHz wavelength. The
      curves for the 80/40 SR were smooth.
      > P.P.S They are all at least as good
      as the 1000's improved RX.
      > .
      >

      > <
      href="http://geo.yahoo.com/serv?s=97359714&grpId=16110173&grpspId=1603396379&">http://geo.yahoo. com/serv? s=97359714& grpId=16110173& grpspId=16033963 79&
      >
      msgId=5547&stime= 1153824549>

      >

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