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<DIV id=g_title>Bicycle pump CW key</DIV></H1>
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<DIV id=g_description>by OH6DC</DIV>
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<P>An ordinary bicycle pump - a natural starting point for building a "pump" CW key.</P>
<P>(The so called "pump" keys seldom have anything to do with <I>real</I> pumps. This one is an exception.)</P>
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<P>Choose a party balloon to suit your taste and attach it to the pump nozzle. A short length of garden hose is used to hold the balloon tightly in place without air leaks. </P>
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<P>Two oversized hose clamps are attached to the pump shaft. The ends of the steel bands are bended so that they come near each other. A paper clip is needed for contacts.</P>
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<P>"Key up" position: empty balloon - no contact.</P>
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<P>"Key down" position: air pressure in the balloon makes the contacts touch.</P>
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<P>Keying cable is connected with alligator clips to the clamps.</P>
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<P>Pneumatic CW on the air. Two hands are needed. </P>
<P>See & hear a video clip:</P><embed height="300" width="400" id="VideoPlayback" style="WIDTH: 400px; HEIGHT: 326px" align="middle" src="http://video.google.com/googleplayer.swf?docId=-3129887595749713370&hl=en" type="application/x-shockwave-flash" quality="best" bgcolor="#ffffff" scale="noScale" salign="TL" flashvars="playerMode=embedded" allowNetworking='internal' allowScriptAccess='sameDomain'>
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<IMG style="BORDER-TOP-WIDTH: 0px; BORDER-LEFT-WIDTH: 0px; BORDER-BOTTOM-WIDTH: 0px; BORDER-RIGHT-WIDTH: 0px" tabIndex=0 src="https://img1.daumcdn.net/relay/cafe/original/?fname=http%3A%2F%2Foh6dc.cw.googlepages.com%2Fpumppu1.jpg%2Fpumppu1-medium.jpg" closure="" hashcode="" galleryimg="no"></A><A style="BORDER-TOP-WIDTH: 0px; CLEAR: left; BORDER-LEFT-WIDTH: 0px; FLOAT: left; BORDER-BOTTOM-WIDTH: 0px; MARGIN-BOTTOM: 1em; MARGIN-RIGHT: 1em; BACKGROUND-COLOR: transparent; BORDER-RIGHT-WIDTH: 0px; TEXT-DECORATION: none" href="http://oh6dc.cw.googlepages.com/pumppu3.jpg/pumppu3-full.jpg" imageanchor="1">
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