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Re: RxTx 6.3 receiver sensitivity.

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  • p00bear0407
    Excellent suggestions! I will probably start tracing things this weekend. The inductors are the most likely suspect right now - miswound or mis-connected
    Message 1 of 7 , Aug 28, 2009
      Excellent suggestions!
      I will probably start tracing things this weekend. The inductors are the most likely suspect right now - miswound or mis-connected probably. If not, tracing the signal should show the culprit.

      Thanks to everyone for their replies!



      --- In softrock40@yahoogroups.com, Gerry Huss <gerryhombre007@...> wrote:
      >
      > Hi Jim,
      > if u have a nice hp source, so why dont u connect it from mixer backwards to antenna jack point for point to see, where u loose ?
      > In case no RF lossses to be found, can u check with a scope from mixer out to output to soundcard ?
      > Wish u success,
      > 73 de
      > Gerry, OE6HGG
      >
      > --- g8voip <g8voi.reeves59@...> schrieb am Do, 27.8.2009:
      >
      >
      > Von: g8voip <g8voi.reeves59@...>
      > Betreff: [softrock40] Re: RxTx 6.3 receiver sensitivity.
      > An: softrock40@yahoogroups.com
      > Datum: Donnerstag, 27. August 2009, 23:22
      >
      >
      >  
      >
      >
      >
      > Hi Jim,
      >
      > Have you built any of the other RX filter modules you could try instead and confirm if it is working correctly on any other band?
      >
      > A silly one, but you did have the PA / filter module installed for the same band, as the receive input signal passes through that module and the filter. If that module is not fitted you need to have a link between pins 1 and 5 on J2 on the main board.
      >
      > If you had the PA / filter fitted, then perhaps something around the RX signal switching and the FET's U7 / U8?
      >
      > 73, Bob G8VOI
      >
      > --- In softrock40@yahoogro ups.com, "p00bear0407" <jgeorge0407@ ...> wrote:
      > >
      > > I fired up the RxTx6.3 last night as a complete receiver for the first time last night. It worked immediately and I was listening to SSB conversations on the 40M band. I tested it with my signal generator (a really nice HP) and found that it was not very sensitive, needing almost 100uV to get good strong output. Therefore, I have concluded that I have made a build error, most likely in winding or installing the inductor/transforme rs. The softrock 40 I have is sensitive down to 2 uV, so I don't think my measurements are representative of nominal performance for a RxTx6.3. Any similar experiences? Where was the fault?
      > >
      > > Jim
      > > N3ZY
      > >
      > > PS These kits are unbelievably awesome. Tony is a Saint in my eyes for making this available to us at such a nominal cost - and with such stellar quality. He obviously has spent a HUGE number of hours optimizing these things.
      > >
      >
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