Batboard

I have spoken to a number of antenna engineers and form members regarding a few coverage issues. The members on this forum have been great and the information has been terrific. I ralize I am over shooting the area that needs coverage

I have a UHF base that has a terrible dead spot .75 to1.5 miles from the eliptical dipole array 9.0 db gain antenna (400' above sea level to sea level). I have been advised by 1 engineer to use a phasing harness and a yagi antenna in conjunction with my dipole array to improve the coverage of this area. The harness cost is within my budget as is a power divider which, by discription, might fit the same application needs.

Has anyone tried a configuration like this with success?

I Tried a 0 gain antenna at this location this morning and still had trouble covering the dead spot. I also tried the yagi with great improvement in the direction pointed but as expected the overall coverage was poor.

I realize my gr1225 will be splitting the 25- 30 watt output between 2 antennas and there will be loss adding any device. I am attempting to obtain funds for a MTR repeater

Thanks for any input provided

Mark

Mark - Would it be fair to characterize the river area you're trying to cover as looking like a winding ditch? From what I can tell looking at maps of the area, the elevation on both sides is about the same with a deep drop off into the river. If this were a building, I'd be running a bda or radiax.

The gr1225 is at the same location as the main repeater and as you know I am trying despritely to improve the coverage.

The Hills on either side of the rivers range from 270-400' with the exception North 2 miles from the present antenna. the height is approx. 150' to the west of the North river and 225 above the nortwest river. Both rivers combine into 1 river 1.2 miles from the present antenna.

The primary repeater , an MTR2000 with a 12 db gain antenna, at the present location has a voting receiver on a 100 foot monopole 1.5 miles north of the site to cover dead spots. The elevation is about 2oo' above the North south river but has limited coverage of the NW river. The main site covers the NW river for 3 miles. ( your original map shows this the stopping point is Rte 188).

Mark - Chasing through Derby on teh google earth, to cover the area of interest along the river, you need a site at either the broadcast tower on Great Hill Rd, or develope a site in the Osbournedale State Park. The broadcaster is your better bet for access. However, you will probably need to invest in a good pass-reject duplexer if they don't have a land mobile room already with all the necessary combiners, isolators, and multicouplers.