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70059Re: [softrock40] Receive Sort Of Working

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  • Patrick Hall
    Nov 14, 2012
      Okay, now I'm really confused.  I removed the RX jumpers and set them straight (they were crossed as per the instructions).  However, now I only see a spectrum in PSDR within the white bandwidth bars.  So, for example, if I'm in USB mode there's a white bar to the right of my carrier, and I only see a spectrum inside of that bar.  I also only hear a squeal over the headphones.  It's possible I may have damaged something during the rework as I did accidentally lift a pad on the bottom side (which is why I hate doing rework). 
      I'll continue to investigate.  I should change the title to "Receive Definitely Not Working".  :-)

      From: Alan <alan4alan@...>
      To: softrock40@yahoogroups.com
      Sent: Wednesday, November 14, 2012 12:07 AM
      Subject: Re: [softrock40] Receive Sort Of Working

      ----- Original Message -----
      Subject: Re: [softrock40] Receive Sort Of Working

      >I managed to calibrate the Si570 so that WWV is within 1 kHz. However, I picked up a ham station on 20m and notice that I could
      >only dial him in on lower sideband. How do I fix this (reverse the sidebands)?


      This IS with PSDR?
      Then change the RX IQ link.
      Do you mean 1Hz? This is how close you should be (for a few minutes).
      In any case the tuning will not have been correct, you should have noticed it was reversed.

      73 Alan G4ZFQ

      ----- Original Message ----- Subject: [softrock40] Receive Sort Of Working>First of all, why is WWVH not at 10.000 MHz?PatrickWait
      until conditions are good enough to hear amateur signals with PSDR. Check they are on the right sideband. Or, if you can, check the
      tuning is correct with HF on the right. If not cross IQ. Then calibrate the Si570, one way
      <http://sites.google.com/site/g4zfqradio/calibrating-the-softrock-si570-usb-controller>>Also, when I tune around using PSDR, I
      notice that I have a huge 35 dB spike that follows me around and always remains about 10 kHz >below center, even when no antenna is
      connected. Does anyone know what might cause this?This is normal. As you observe PSDR is configured to avoid this. Other software
      shows where it is, in the centre of the tuning band. Spike is produced by many soundcards, a wider mound is ground loop.73 Alan

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