Here's some info that might help regarding single-point grounding, attached.
----- Original Message ----- From: "Eric Lemmon" <[email protected]> To: <[email protected]> Sent: Friday, July 10, 2009 8:01 PM Subject: RE: [Repeater-Builder] RE: Lightning Protection > Although Polyphaser protectors have a large and loyal following, they are > seldom used in high-end commercial two-way and cellular sites, where the > preference is for Huber+Suhner devices. H+S protectors are very > expensive- > perhaps four or five times the cost of a Polyphaser- but they are machined > out of stainless steel, are waterproof, and have easily-replaceable gas > tube > elements that are available in a wide range of ratings. When you have a > revenue-producing station that is costly to build, you don't skimp on > lightning protection. More info about H+S protectors is here: > > <www.hubersuhner.com/ie70/products/hs-p-rf/hs-rf-lightning-protectors.htm> > or > <http://tinyurl.com/lnos4d> > > However, since the majority of non-revenue repeater owners are satisfied > with Polyphasers, it should be pointed out that there are many models of > protectors in the Polyphaser catalog. The purchaser should take care to > select the particular model that allows the least amount of energy > let-through for a given operating frequency and power level. The > protectors > are designed for a specific connection arrangement, and the antenna and > equipment sides should not be reversed. The Polyphaser gas tube elements > are soldered in place, and are not easily replaceable. > > Regardless of the brand of lightning protector used, it is very important > that the protector body have an effective connection to ground over as > low-impedance path as possible. Chris' comment about AC power line > protection is a good one. Any phone or control lines entering the station > should also be protected with gas tube arrestors. > > 73, Eric Lemmon WB6FLY > >
