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Re: Troubleshooting Softrock lite RX - FIXED!!

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  • norman.billingham
    Hi Tony Thanks - that s Christmas sorted then! All best Norman ... next week. Your October 8 order would put you in the group to receive one of the Si570
    Message 1 of 20 , Dec 3, 2008
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      Hi Tony

      Thanks - that's Christmas sorted then!

      All best

      Norman

      --- In softrock40@yahoogroups.com, "Tony Parks" <kb9yig@...> wrote:
      >
      > Hi Norman,
      >
      > I have 100 pices of the CMOS Si570 due in later this week or early
      next week. Your October 8 order would put you in the group to
      receive one of the Si570 devices to be mailed next Monday or Tuesday.
      >
      > Glad to hear the I and Q signals now look right with the AC gain
      about right from antenna input to audio output.
      >
      > 73,
      > Tony KB9YIG
      > ----- Original Message -----
      > From: norman.billingham
      > To: softrock40@yahoogroups.com
      > Sent: Wednesday, December 03, 2008 1:20 PM
      > Subject: [softrock40] Re: Troubleshooting Softrock lite RX -
      FIXED!!
      >
      >
      > Hi Tony
      >
      > Checka all capacitor and rseitance values this afternoon and all
      > seemed OK. Despite having inspected everything under 10X
      > magnifcation and found no problems, I decided before yanking
      > components to flux everything around the mixer and op amps and
      touch
      > up every joint with a hot iron and it came to life - must have
      been a
      > joint that was OK for DC but not AC as all voltages were OK.
      >
      > It's sitting on the bench putting out about 1.6V of I and Q from
      > about 40mV RF in.
      >
      > Anyway - thanks again for all the help.
      >
      > Any news on when I'm likely to get the Si570 for my V9 kit?
      Ordered
      > on October 8
      >
      > 73 Norman
      >
      > --- In softrock40@yahoogroups.com, "Tony Parks" <kb9yig@> wrote:
      > >
      > > Hi Norman,
      > >
      > > With DC gain of each op-amp about right, it seems that R9 has a
      > larger resistance than 10 ohms, or C14 has more capacitance than
      220
      > pF, or there is an AC load on the pin 1 output of U5. (Also still
      > the possibility there is a problem with U5.) I would suggest
      > removing C16 first to see if the AC voltage at pin 1 of U5
      increases
      > with the RF test signal input you are using. Next, remove C14.
      > >
      > > 73,
      > > Tony KB9YIG
      > >
      > >
      >
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