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<title>PC200 Antenna Design Overview</title>
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<td align="right" valign="bottom" bgcolor="#fffff2" colspan="2"><font size="6" color="#000000">PC200</font><br>
<font size="5"> Antenna Design</font></td>
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<strong> Safety Note</strong></font></p></td>
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<p align="center"><strong>This overview is meant to illustrate
some basic principles of antenna design - it is not intended to act as a
substitute for the detailed instructions contained in the PC200
User's Manual.</strong></p>
<p align="center"></p>
<p align="center"><font size="4"><strong>Please read the manual carefully before attempting
an actual installation.</strong></font></p>
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<p><strong>Antenna Definition</strong> - A rigid conductor, mounted on insulators
and placed around or adjacent to an area to be protected. See the PC200
<a href="pc200app.htm">conveyor-stop application</a>, for an example of a
typical antenna.</p>
<p> </p>
<p><strong>Materials </strong>- Antennas may be constructed of metal rod, flat stock,
1/2" or 3/4" copper pipe or 3/4" electrical
conduit; materials must be rugged enough for the environment and
hollow, in order to maximize field.</p>
<p> </p>
<p><strong>Insulators </strong>
- Any rigid, nonporous insulating material is suitable to
isolate the antenna from ground. The antenna must not touch
ground, and should be kept 3 inches or more from grounded metal,
if possible. Insulators should be wiped clean regularly, to
insure proper operation. The <a href="insulatr.htm">insulators
page</a> gives prices and specifications on some insulators that are commonly used.
These items may be purchased directly from Gordon, purchased from a plumbing supply
or made by you.</p>
<p> </p>
<p><strong>Sensing Field</strong> - The unit generates an electromagnetic field
around the antenna elements. This field is sensitive to touch by
personnel, machinery and metal parts. Changes in the field are
introduced when the antenna is touched, and the unit alarms.</p>
<p> </p>
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<p><font size="5">Summary:</font></p>
<p><font size="4"><img src="images/BlueBall.gif" width="25" height="13">The antenna must be rigidly mounted
to prevent movement relative to the machine and
ground.</font></p>
<p><font size="4"><img src="images/BlueBall.gif" width="25" height="13">The antenna must be isolated from ground.</font></p>
<p><font size="4"><img src="images/BlueBall.gif" width="25" height="13">The antenna should be mounted no closer to
ground than 3 inches.</font></p>
<p><font size="4"><img src="images/BlueBall.gif" width="25" height="13">Install and test according to the PC200 manual.</font></p>
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