Actually... the 4 and 8 bay antennas, 2 dipoles side by side on one horizontal cross arm, mounted over the same assembly spaced vertically on the mast/pole. The 8 bay antenna has 4 cross arms (2 dipoles on a horizontal cross arm) per mast/pole.
Didn't matter which way the dipoles bays were aligned. Normally two of the horizontal cross arms were parallel or perpendicular depending on the desired pattern. I should try one of the 2 dipole horizontal arms by itself to see if it just as easily makes a gremlin (IMD). I have a large number of the vertical in-line (single) sinclair antennas and they work very well. I also have some of the above multi bay antennas in the UHF Version without the grunge (gremlin) generator problem. A Sinclair Engineer (at IWCE) told me they reworked the VHF problem generator antenna models and the newer, current versions don't have that problem. I have yet to hear reports from persons using the current version. The dipole engineering is sound and I've used it (and their products) in many other locations and applications. There's just some quirk in that version of putting 2 or 4 VHF dual dipole assemblies over each other with the supplied coax harness that becomes an easy IMD/PIM (grunge) generator. cheers, s. > "Chuck Kelsey" <wb2...@...> wrote: > > OK, those weren't a problem according to Skipp. The problem > ones were those with two dipoles mounted at the same elevation > on opposing sides of the > mast. > > Chuck > WB2EDV > > > ----- Original Message ----- > From: "Nate Duehr" <n...@...> > To: <[email protected]> > Sent: Monday, May 25, 2009 12:13 AM > Subject: Re: [Repeater-Builder] Re: Sinclair dipole array premature failure > (noisy) > > > > > > On May 22, 2009, at 6:08 AM, Chuck Kelsey wrote: > > > >> Nate - > >> > >> Were these dual-dipole arrays - a total of 4 elements? Or were they > >> two > >> elements - one mounted over the top of the other? > >> > >> Chuck > >> WB2EDV > > > > > > 2-elements only, vertically mounted one above the other. > > > > http://www.sinclairtechnologies.com/catalog/product.aspx?id=1682 > > > > -- > > Nate Duehr, WY0X > > n...@... > > > > > > >
