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GPS noise on HF

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  • Eric J Foster
    Hi, I m running the GPS III+ and TM-D and Icom 706 head side by side on my dash. Does anyone else get a pulsing data noise on top of white noise on hf? The
    Message 1 of 5 , Nov 4, 2001
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      Hi,
      I'm running the GPS III+ and TM-D and Icom 706 head side by side on my
      dash. Does anyone else get a pulsing data noise on top of white noise on
      hf? The lower in freq I go, the worse it gets. If I shut down the gps,
      or unplug the power/data cable, the noise is gone. Would ferrites take
      care of this? Shield the cable somehow?
      Thanks
      for any ideas, Eric
    • Sid
      My GPS III+ is located down on the console next to my 10 meter rig and I get the pulse type noise. Off goes the GPS and away goes the noise. The noise is
      Message 2 of 5 , Nov 4, 2001
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        My GPS III+ is located down on the console next to my 10 meter rig and I get the pulse type noise. Off goes the GPS and away goes the noise.
         
        The noise is generated on both internal batteries as well as 12V auto power. I've been unsuccessful in making it go away.
         
        73
        Sid N3YBE
         
        ----- Original Message -----
        Sent: Sunday, November 04, 2001 8:55 AM
        Subject: [TMD700A] GPS noise on HF

        Hi,
        I'm running the GPS III+ and TM-D and Icom 706 head side by side on my
        dash. Does anyone else get a pulsing data noise on top of white noise on
        hf? The lower in freq I go, the worse it gets. If I shut down the gps,
        or unplug the power/data cable, the noise is gone. Would ferrites take
        care of this? Shield the cable somehow?
                                                                        Thanks
        for any ideas, Eric



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      • WO1V@aol.com
        ... TMD700A@yahoogroups.com ... power. ... HREF= mailto:tmd700a@yahoogroups.com TM-D700 Group ...
        Message 3 of 5 , Nov 5, 2001
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          In a message dated 2001-11-04 21:55:07 MST, Sid147@... writes:

          > Subj: Re: [TMD700A] GPS noise on HF
          > Date: 2001-11-04 21:55:07 MST
          > From: Sid147@... (Sid)
          > Reply-to: <A HREF="mailto:TMD700A@yahoogroups.com">
          TMD700A@yahoogroups.com</A>
          > To: TMD700A@yahoogroups.com
          >
          > My GPS III+ is located down on the console next to my 10 meter rig and I
          > get the pulse type noise. Off goes the GPS and away goes the noise.
          >
          > The noise is generated on both internal batteries as well as 12V auto
          power.
          > I've been unsuccessful in making it go away.
          >
          > 73
          > Sid N3YBE
          >
          > ----- Original Message -----
          > From: Eric J Foster
          > To: TM-D700 Group
          > Sent: Sunday, November 04, 2001 8:55 AM
          > Subject: [TMD700A] GPS noise on HF
          >
          >
          > Hi,
          > I'm running the GPS III+ and TM-D and Icom 706 head side by side on my
          > dash. Does anyone else get a pulsing data noise on top of white noise on
          > hf? The lower in freq I go, the worse it gets. If I shut down the gps,
          > or unplug the power/data cable, the noise is gone. Would ferrites take
          > care of this? Shield the cable somehow?
          > Thanks
          > for any ideas, Eric
          >
          >
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          > <DIV>My GPS III+ is located down on the console next to
          > my 10 meter rig and I get the pulse type noise. Off goes the GPS and away
          > goes
          > the noise.</DIV>
          > <DIV> </DIV>
          > <DIV>The noise is generated on both internal batteries
          > as well as 12V auto power. I've been unsuccessful in making it go
          > away.</DIV>
          > <DIV> </DIV>
          > <DIV>73</DIV>
          > <DIV>Sid N3YBE</DIV>
          > <DIV> </DIV>
          > <BLOCKQUOTE
          > style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px;
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          > #000000 2px solid; MARGIN-RIGHT: 0px">
          > <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
          > <DIV
          > style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">From:
          > <A HREF="mailto:ke1lb@...">Eric J Foster</A> </DIV>
          > <DIV style="FONT: 10pt arial">To: <A
          HREF="mailto:tmd700a@yahoogroups.com">TM-D700 Group</A> </DIV>
          > <DIV style="FONT: 10pt arial">Sent: Sunday, November 04, 2001 8:55
          > AM</DIV>
          > <DIV style="FONT: 10pt arial">Subject: [TMD700A] GPS noise on HF</DIV>
          > <DIV>
          > </DIV><TT>Hi,
          > I'm running the GPS III+ and TM-D and Icom 706 head side by side on my
          > dash. Does anyone else get a pulsing data noise on top of white noise on
          > hf? The lower in freq I go, the worse it gets. If I shut down the gps,
          > or unplug the power/data cable, the noise is gone. Would ferrites take
          > care of this? Shield the cable somehow?
          > &
          > nbsp; &
          > nbsp; &
          > nbsp; &
          > nbsp;
          > Thanks
          > for any ideas, Eric
          >
          > </TT>
          >
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          I hope this msg will be copied in full here....

          My point: it lookds like it has about *FOUR* lines of real data in it...
          Then does it have to be that very long and clog the system?

          I enjoy monitoring this list, in view of my future GPS projects, but the
          percentage of useful bytes is woefully low...

          Cheers.

          Christian D
          wo1v@...
        • Eric J Foster
          The noise comes from the gps. I unplug the cable from the unit, and it goes away. If I unplug it from the TM-D, it stays. I bought a couple ferrite cores from
          Message 4 of 5 , Nov 5, 2001
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            The noise comes from the gps. I unplug the cable from the unit, and it
            goes away. If I unplug it from the TM-D, it stays. I bought a couple
            ferrite cores from Rat Shack, but they didn't help.
            Could strategically placed capacitors help? Shielded cable? I hate to
            hae to shut the gps off everytime I want to listen on HF, kinda defeats
            the purpose...........
          • Philip J. Kubat, Jr.
            I would look into isolating the GPS using a opto-isolation. I know on my boat I had to do this. (differential vs. level signaling issue, not for noise) but I
            Message 5 of 5 , Nov 5, 2001
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              I would look into isolating the GPS using a opto-isolation.  I know on my boat I had to do this.  (differential vs. level signaling issue, not for noise) but I would suspect this would help.  I know in the marine field there are pre-made cables.  I used a multiplexer (http://www.nolandengineering.com/product.html) they do not have these cables, but they might know where to obtain them.  The Capn has their own cable (http://www.thecapn.com/optoiso.htm)  You should be able to find them cheaper, I  think I saw some in the 20-30 dollar range on the "net".   Otherwise you could build one, half the circuit could be taken from packet sound board PTT isolated interface (for example http://www.w5bbr.com/soundbd.html)  you'll just have to drive the GPS side.
               
              Phil - KB1DZF
               
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