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Re: [softrock40] Re: RXTX v6.2 20/30m no image suppression and other problems

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  • Tony Parks
    Hi Peder, Please send me your mailing address and I will get one of the TLV2462 devices mailed to you on Friday, September 28. 73, Tony KB9YIG ... From: sm0gns
    Message 1 of 5 , Sep 27, 2007
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      Hi Peder,
       
      Please send me your mailing address and I will get one of the TLV2462 devices mailed to you on Friday, September 28.
       
      73,
      Tony KB9YIG
      ----- Original Message -----
      From: sm0gns
      Sent: Thursday, September 27, 2007 3:56 PM
      Subject: [softrock40] Re: RXTX v6.2 20/30m no image suppression and other problems

      Hi Jose

      Thanks for the hint about pin 7 on U8.

      I have now removed U8 from the board and it seems to be broken.
      It is a short between pin 7 and 4 on this IC.

      Will see if I can get one of these IC here, otherwise I need to talk
      to Tony.

      73 de Peder, SM0GNS

      --- In softro
      ck40@yahoogroups. com, "Jose Bonanca" <jbct1aos@.. .> wrote:
      >
      > I had the same problem and it come out to be U8 troubled pin7 was
      negative.
      > You must follow the +5 v. it must be around 4.9v.
      >
      >
      > Good luck
      >
      >
      >
      > On 9/27/07, sm0gns <peder.hp@.. .> wrote:
      > >
      > > Hi all.
      > >
      > > My name is Peder, SM0GNS.
      > >
      > > I have now built my 20/30m version, but have some problems.
      > >
      > > The RXTX draw too much power. In receive it draws 110 mA witch is
      too
      > > high (should be less than 60 mA)
      > >
      > > U4 (78L05) gets rather hot. The voltage of the input pin of U4 is
      > > about 5.7 volt, and at the output pin it is 3.5 volt. I am using
      12
      > > volt for input to the RXTX.
      > >
      > > With the daughtercard disconnected, the resistance at the +5 and
      +12
      > > volt points is according to the building instructions.
      > >
      > > I have checked for solder bridges and also checked most of the
      > > components to see if I have done something wrong, but so far I
      have
      > > not found anything that indicate where the problem is.
      > > (I also checked T1 and T4...)
      > >
      > > When using the RXTX with Rocky, I can see some signals, but I am
      > > unable to suppress the image.
      > > I think that this problem have something to do with the low output
      > > voltage on U4.
      > >
      > > Does anyone of you out there have any idea what I might have done
      > > wrong?
      > >
      > > Thanks in advance
      > > Peder, SM0GNS
      > >
      > >
      > >
      >
      >
      >
      > --
      > Jose Bonanca (CT1aos)
      >

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