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9293Re: [softrock40] Re: Softrock 40/80 debug

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  • Michael Karliner
    Mar 2, 2007
    • 0 Attachment
      Yep, all of those things are true.

      I have about 50mv on pins 15 and 1 of U7.

      Mike

      Mike

      Tony Parks wrote:
      > Hi Michael,
      >
      > Please check the DC voltage level at pin 7 of U8. This DC voltage
      > should be around 2.5 volts. Also check right at the pin 15 lead of U7
      > to make sure it is at less than 0.5 volts. Post what you see and I
      > will make additional suggestions.
      >
      > 73,
      > Tony KB9YIG
      >
      >
      > ----- Original Message -----
      > *From:* Michael Karliner <mailto:mike@...>
      > *To:* softrock40@yahoogroups.com <mailto:softrock40@yahoogroups.com>
      > *Sent:* Friday, March 02, 2007 5:45 AM
      > *Subject:* Re: [softrock40] Re: Softrock 40/80 debug
      >
      > Correction T4, (looking at RX schematic...).
      >
      > Mike
      >
      > Michael Karliner wrote:
      > > Thanks for the advice Philip,
      > >
      > > after some hours, I can fairly surely say that checked continuity
      > > everywhere to be OK. What I now have is strong signals, at least
      > > on 40 Meters, including plenty of PSK activity, but no signal on the
      > > 'tip' output, so the band is completely folded over.
      > >
      > > Having got hold of a scope, I can see the I and Q clock signals.
      > > So, my thought is either I have a dead op amp or I've done something
      > > stupid to T1. I'm not quite clear enough about the design to be
      > > able to guess. Any illumination would be very welcome.
      > >
      > > Mike
      > >
      > > philip_g7jur wrote:
      > >
      > >> --- In softrock40@yahoogroups.com
      > <mailto:softrock40%40yahoogroups.com>, "Michael Karliner"
      > <mike@...> wrote:
      > >>
      > >>
      > >>> I completed the build of my TXRX today, checked resistances and
      > >>> initial current drain which seem OK. Upon connecting up to my
      > >>> PC and Rocky, I'm getting faint signals, but they are symmetrical
      > >>> around the center frequency, and connecting headphones to
      > output shows
      > >>> that I've got no signal on the tip side.
      > >>> Unfortunately, I have not much in the way of test gear at the
      > >>> moment, although I'm trying to borrow a scope.
      > >>>
      > >>> Any words of wisdom or suggestions for debugging?
      > >>>
      > >>> Thanks in advance Mike (G8LKD, when I get this working..)
      > >>>
      > >>>
      > >>>
      > >> Hello Mike.
      > >> Get a good powerful light and magnifying glass and check your
      > soldering
      > >> around all the ICs, and other joints.
      > >> I know that this is pretty obvious but this is more likely then
      > a faulty
      > >> component.
      > >> Best of luck Philip g7jur.
      > >>
      > >>
      > >>
      > >>
      > >>
      > >> Yahoo! Groups Links
      > >>
      > >>
      > >>
      > >>
      > >>
      > >
      > >
      >
      > --
      > Care about the iTunes charts? Try iTracker
      > <http://www.modern-industry.com/itracker
      > <http://www.modern-industry.com/itracker>> , the iTunes history
      > tracker.
      >
      >

      --
      Care about the iTunes charts? Try iTracker
      <http://www.modern-industry.com/itracker> , the iTunes history tracker.
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