I found some Plans on this groups page for a home made 4 pole array http://forums.radioreference.com/antennas-coax-forum/109144-4-bay-vhf-dipole-array-project.html
scroll down a few responses and download the PDF document, I'm building one at this time. I just started to look at the spacings in EZNEC and it looks nice. Mike --- In Repeater-Builder@yahoogroups.com, Eric Grabowski <ejgrabow...@...> wrote: > > I have used schedule 40 PVC for several antennas from HF thru 440 MHz without > a problem. It does have a dielectric effect however that you must take into > account. > > There is another plastic pipe called CPVC that does absorb RF at the higher > frequencies. You don't want to use that. > > To make sure your plastic pipe will work ok, do the microwave test. Put a > short length of the plastic pipe in a microwave along with a coffee mug > filled with water. Run the microwave for a while. Then see if the plastic > gets hot. If it does, you don't want to use it for RF. > > 73 and aloha, Eric KH6CQ > > --- On Wed, 8/12/09, AJ <aj.grant...@...> wrote: > > From: AJ <aj.grant...@...> > Subject: Re: [Repeater-Builder] Re: 2M Vertical Dipoles > To: Repeater-Builder@yahoogroups.com > Date: Wednesday, August 12, 2009, 5:05 AM > > > > > > > > > > > > > Does really PVC absorb or RF or just act as a dielectric? > > The reason I ask is I'm looking at encasing an antenna project for the sake > of weatherproofing and PVC would fit the bill rather easily. > > 73, > AJ, K6LOR > > > On Mon, Aug 10, 2009 at 9:49 AM, AA8K73 GMail <aa8...@gmail. com> wrote: > > > AJ, if you replace the steel mast with a fiberglass one, > won't you still have the metallic feed line there? > > > Doesn't PVC absorb RF? > > > 73, > Mike > > > > > > AJ wrote: > > > On this same topic of the mast-less Antennex/Laird dipole arrays, has anyone > attempted to top mount these from a fiberglass mast to minimize interaction > with the normal steel pole? I have quite a few surplus fiberglass poles left > that would likely work, even for side mounting on 1/2 wave spacing from the > tower... > > On that same note, does anyone have construction plans for a dipole array > (not necessarily folded dipoles)? I remember seeing a set of plans somewhere > quite a while ago - we're thinking of constructing one but encasing the > dipoles in fiberglass or PVC to try to protect from the weather and debris at > our site (top of a large farm field)... > > 73, > AJ, K6LOR > > > > > > > > > > > > > > > > > > > > > > > > > > > > > __________________________________________________ > Do You Yahoo!? > Tired of spam? Yahoo! Mail has the best spam protection around > http://mail.yahoo.com >
