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Re: Rxtx V6.3 rx mixer problem

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  • nj2e
    Thanks for the input. After a nights rest, I found problem. The lead for U9 pin 9 was not soldered. It passed test for U9, I placed tip of test lead on the
    Message 1 of 4 , Mar 9, 2009
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      Thanks for the input. After a nights rest, I found problem. The lead
      for U9 pin 9 was not soldered. It passed test for U9, I placed tip
      of test lead on the lead (as recommended) and not on the pad. To
      paraphrase "Cool Hand Luke", We have failure of continuity.


      --- In softrock40@yahoogroups.com, "nj2e" <donk47@...> wrote:
      >
      > Hello, I've been working on my RxTX V6.3 kit and have gotten as far
      > as the rx mixer without a problem (this is my third SDR kit, SR40 and
      > V9.0). I have been using WB5RVZ's builder notes (A great job). My
      > problem is this,during the testing phase of this section everything
      > checks out except for U10 pin 14, it should read "1/2 of 5v rail",
      > mine rail is 4.99v so it should read around 2.5v. Instead I am getting
      > only .06v. Pin 9 of U9 reads 2.23v. Pin 2 of U10, reads 2.23v I
      > thought the FST3253 could be bad, so I replaced it with another and got
      > the same results. I have done the usual things inspected soldering and
      > parts values and placement. I am using the jumper for Q4 and the tests
      > were done with and without the BPF. Does anyone have any thoughts on
      > my problem? In advance thank you for your help. Regards and 73s, Don
      > NJ2E
      >
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