RE: [Repeater-Builder] polyphaser Help

[Eric Lemmon]

If your antenna is metal and of DC-grounded design, as most commercial antennas are, then the base of the antenna should definitely be connected to the nearest structural metal- be it the roof, the coping, an I-beam, or whatever.  This conductor should be very heavy-gauge copper wire, #2 or larger, and it should be dressed in as straight a line as possible, with very gradual bends.  The terminals should be copper or bronze, with stainless steel or bronze hardware.   The radio equipment should be enclosed in a metal cabinet, and the antenna feedline should enter this cabinet through a high-quality gas-tube surge arrestor such as those made by Huber+Suhner.  They are expensive, but far better than those made by PolyPhaser, IMO.  The cabinet should be solidly grounded to the nearest structural steel.  The AC power feed should also enter the cabinet through a commercial surge arrestor.  Don't expect the ground wire in a nearby AC receptacle to handle your lightning protection grounding.  Any phone or control wires entering the cabinet should be protected by gas-tube arrestors.  The key point is to ensure that any conductors entering the cabinet must have a gas-tube arrestor that is selected based upon the frequency, voltage, and power levels expected.  I use Huber+Suhner devices because the gas elements are made in many different ratings, are easily replaced in the field, and the housings are of stainless-steel construction.   73, Eric Lemmon WB6FLY From: Repeater-Builder@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, December 30, 2005 11:23 AM To: repeater-builder@yahoogroups.com Subject: [Repeater-Builder] polyphaser Help Replacing a small, rooftop (about 90ft)  repeater setup.  The prior system had no lighting protection, just straight coax from antenna to duplexer.  I was looking into getting a polyphaser if needed but there is no way to ground it that I can tell.  Two options I have would be to somehow tap into the metal roof and connect it to that? or at the radio-end of the coax attach it to a nearby AC outlet's ground?  A grounding line/rods aren't a real good option since it is on another businesses property.  Any suggestions? YAHOO! GROUPS LINKS  Visit your group "Repeater-Builder" on the web.    To unsubscribe from this group, send an email to:  [EMAIL PROTECTED]    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.