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Old 6-Jul-2017, 8:45 PM   #26
rabbit73
Retired A/V Tech
 
Join Date: Aug 2012
Location: S.E. VA
Posts: 2,747
Quote:
rabbit73, thanks for those images. They are showing exactly what my problem is. In the 3rd image (google) you can see where the signal is stronger prior to the last peak before the antenna.
I'm glad that you found it helpful and have confirmed that the hill exists.
Quote:
I'm curious how you obtained the 1st image showing the elevations, etc.
The tvfool terrain profile gave me a clue that there might be a problem, so I used a different software for the terrain profile found here:
http://www.heywhatsthat.com/profiler.html

To use the software, I had to enter your coordinates and the coordinates of the transmitter. Since I don't know the coordinates of your antenna, I had to make an estimate derived from your tvfool report. So, there could be some errors from that, along with some inherent in the software.

It takes a while to learn how to use it, because there isn't much in the way of directions.

jrgagne99 has some doubts about the accuracy of the software. In his case, it shows a hill in the signal path that he says isn't there. I think what happened in his case, there is a tall stand of trees in the signal path that was read as an increase in elevation. The elevation readings were probably done by aerial survey, which might include the height of the trees. Years ago, elevation was measured on the ground from benchmarks. In the final analysis, it's just as damaging to the signal as a hill.

I think this is what he remembers:





This is his thread:
http://forum.tvfool.com/showthread.php?t=16101

This view supports JR's contention that there isn't much of a nearby hill in the WCAX signal path, but there are certainly a lot of trees, unless they have been clear cut.

Attached Images
File Type: jpg jrgagne99TVFtrees2.jpg (145.6 KB, 1432 views)
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Last edited by rabbit73; 7-Jul-2017 at 1:04 AM.
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