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Vibroplex contacts

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  • vk4wm
    Are Vibroplex contacts made from solid silver slug of any thickness or are they electroplated silver and only a fairly thin coating? I own a Champion and the
    Message 1 of 7 , Jul 5, 2011
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      Are Vibroplex contacts made from solid silver slug of any thickness or are they electroplated silver and only a fairly thin coating?

      I own a Champion and the contacts need trueing up and polished but I want to know just what I am up against before doing that.

      73 Wade VK4WM
    • WILLIS COOKE
      The ones on mine seem to be a piece of silver bar welded or brazed to the support.  I have trued mine with a contact burnisher with no
      Message 2 of 7 , Jul 6, 2011
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        The ones on mine seem to be a piece of silver bar welded or brazed to the support.  I have trued mine with a contact burnisher with no apparant detriment except for a small loss of silver.  They can be replaced if required, but I have never seen contacts that are completely gone, even on my 90 year old bugs with unknown commercial use.  A couple that have been unused for many years did require removing a small amount of oxide to function properly.
         
        Willis 'Cookie' Cooke
        K5EWJ & Trustee N5BPS, USS Cavalla, USS Stewart



        From: vk4wm <vk4acb@...>
        To: cw_bugs@yahoogroups.com
        Sent: Wed, July 6, 2011 12:35:19 AM
        Subject: [cw_bugs] Vibroplex contacts

         

        Are Vibroplex contacts made from solid silver slug of any thickness or are they electroplated silver and only a fairly thin coating?

        I own a Champion and the contacts need trueing up and polished but I want to know just what I am up against before doing that.

        73 Wade VK4WM

      • Fred Maas
        solid silver. i polish them into convex surfaces that glide across each other. old ones are usually pitted from relatively high currents and voltages and
        Message 3 of 7 , Jul 6, 2011
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          solid silver. i polish them into convex surfaces that glide across each other.  old ones are usually pitted from relatively high currents and voltages and cause problems until polished out.

          fred - kt5x

          On Tue, Jul 5, 2011 at 11:35 PM, vk4wm <vk4acb@...> wrote:
           

          Are Vibroplex contacts made from solid silver slug of any thickness or are they electroplated silver and only a fairly thin coating?

          I own a Champion and the contacts need trueing up and polished but I want to know just what I am up against before doing that.

          73 Wade VK4WM


        • VK4ACB
          Thank you both for the information Willis and Fred, I see what you mean, I carefully cleaned the perimeter of the contacts and can now see the thickness of the
          Message 4 of 7 , Jul 7, 2011
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            Thank you both for the information Willis and Fred, I see what you mean,
            I carefully cleaned the perimeter of the contacts and can now see the
            thickness of the actual contact, there is still plenty of material left
            on them so they should respond nicely.

            73 Wade VK4WM
          • Fred Maas
            meant that you might collect experiences in a shorter period of time. Don t think there are definitive answers, but I can tell you that I have sometimes
            Message 5 of 7 , Jul 9, 2011
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              meant that you might collect experiences in a shorter period of time.  Don't think there are definitive answers, but I can tell you that I have sometimes puzzled over the problem of a key not sending well, for YEARS, before hopefully finally finding what was wrong with it.  It isn't necessarily obvious at all.  It isn't all in the operator.
               
              Anwayway, I have had close to one hundred bugs here over the years.  I have sold or traded off all but a handful.  The handful I have kept are not necessarily the best senders, but the most esoteric and the most different from one another in appearance, design, or use.
               
              The 1908 vibroplex with the very rare NorCross plate made split dits.  Experience led me fairly rapidly to the dit spring.
               
              The 1910 Double Lever wasn't so easy.  I could not find a single person who actually knew how to adjust them, nor could I find a single collector who had a copy of any early vibroplex instructions for adjusting one.  I feel stupid now, it took me several years to figure out what now seems obvious.  Hard to explain the solution, the problem is that with two independent levers, it is possible to close both at the same time.  obviously, the dash closure will cover up any dits that might be going on.  Kinda iambic actually.
               
              I have a wonderfully rare and exotic Bent Dow from the forties.  It too was plagued by split dits.  There were several things working together so the solution wasn't easy or obvious.
               
              Both the early mecograph, and the Australian copy ca;;ed Simplex Auto, use a release mechanism to make dits, opposite of a vibroplex.  The spring is always loaded, and you release it.
               
              All of them are so much fun to use!
               
              73,  Fred - kt5x
               
               
               
               
               
            • Richard Meiss
              Hi, All - I have found another solution for scratchy and bouncy dots when keying a very unforgiving solid state rig. I use the bug to key an MFJ keyer that
              Message 6 of 7 , Jul 9, 2011
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                Hi, All -

                I have found another solution for scratchy and "bouncy" dots when keying a very unforgiving solid state rig. I use the bug to key an MFJ keyer that has a "semiautomatic" function. The electronics in the keyer are very forgiving of bounces and scratches, but what comes out the other end is exactly what you told the bug to do - including all of your timing and "swing" peculiarities. The problem that I have found with a capacitor that you have access to only the "C" in an RC circuit; the inaccessible components vary with the rig that you are keying, and the effectiveness of this approach may also vary.

                73 de Rich, WB9LPU
              • nzeronv
                I have found that Ten-Tec rigs reproduce the switch bounce of the Vibroplex dit contacts too faithfully. Fortunately, a 1 uF capacitor across the bug
                Message 7 of 7 , Jul 15, 2011
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                  I have found that Ten-Tec rigs reproduce the switch bounce of the Vibroplex dit contacts too faithfully. Fortunately, a 1 uF capacitor across the bug terminals did the trick with my Omni VI. YMMV.

                  Jack - N0NV
                  SKCC 1662



                  --- In cw_bugs@yahoogroups.com, "Richard Meiss" <wb9lpu@...> wrote:
                  >
                  > Hi, All -
                  >
                  > I have found another solution for scratchy and "bouncy" dots when keying a very unforgiving solid state rig. I use the bug to key an MFJ keyer that has a "semiautomatic" function. The electronics in the keyer are very forgiving of bounces and scratches, but what comes out the other end is exactly what you told the bug to do - including all of your timing and "swing" peculiarities. The problem that I have found with a capacitor that you have access to only the "C" in an RC circuit; the inaccessible components vary with the rig that you are keying, and the effectiveness of this approach may also vary.
                  >
                  > 73 de Rich, WB9LPU
                  >
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