Hi Guys and Girls. A effective "leaky coax" is cheap Tandy or similar coax that has a poor braid coverage. I have used it many times. Check the attenuation on your freq. per foot and you are away. Cheers from OZ
----- Original Message ----- From: "Dick" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, May 04, 2006 11:33 PM Subject: Re: [Repeater-Builder] Building Repeater > Will, I think that almost any antenna will give you the 1/2 mile coverage > you > need, but you might still have problems inside the building, considering > the > metal roof's shielding. > > I assume you're installing the rptr inside the building, so two ideas come > to mind. > > 1. Use a Wilkinson-type power divider and place a unity gain antenna > inside > the > building and another one on the tower outside. You can mount the antenna > on > the side of the tower and place it a non-resonant distance from the tower. > > 2. Use "leaky" coax cable to go from the repeater to the place where the > tower > antenna's feed line goes through the building to the tower antenna; then > use > regular > coax (such as 9913) from there to the tower antenna. > > "Leaky" coax cable is made with resonant slots in the outer conductor. > It's > used in > tunnels, mines, tall buildings, etc. As I recall a hotel in Reno, NV, had > a > coverage > problem with its UHF rptr feeding an antenna on a roof mounted tower. > They > installed "leaky" coax in their elevator shaft and that solved the > problem. > They > got great coverage inside the building and for several miles around Reno. > > Hope this helps. > > Regards, > > Dick > > ----- Original Message ----- > From: <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: 04 May, 2006 06:13 > Subject: [Repeater-Builder] Building Repeater > > >>I need some assistance from the brains... >> >> I am installing a small UHF repeater (GR500) at a building complex. The >> users are on simplex now, using Motorola HT1250 portables and are having >> problems >> with "dead spots". The complex covers about 50,000 square feet, mixed >> between brick with metal studs, cinder block and some outside covered >> areas. The >> roof is metal. Communications should not be required more than one half >> mile >> from the facility. A fifty foot tower is available on the building. Any >> suggestions or recommendations for the antenna and mounting >> arrangements? >> >> Thanks >> >> Will > > > > > > > Yahoo! Groups Links > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
