Created attachment 510687 [details] patch to fix F/B calculations when modeling over ground (against xnec2c 1.4) By default xnec2c will compare the gain figure with the gain in the exact opposite direction. However, when modeling an antenna over ground, xnec2c cannot calculate gain "underground". This means there is no gain figure in the exact opposite direction from the maximum gain. Instead, use the gain figure at the exact same elevation (theta) as the maximum forward gain, in the opposite azimuthal direction (phi). That gives us a useful F/B figure for antennas modeled over ground. Also fix an unrelated bug where phi overflowing 360 degrees would lead to having 180 degrees subtracted, which would land us in the exact same azimuthal spot as max forward gain. Instead, we need to subtract 360 degrees. The attached patch is against xnec2c-1.4. The xnec2c upstream author does not have a published email address, so I am hoping the Fedora xnec2c package maintainer could apply this patch while I chase down 5B4AZ...
xnec2c-1.4-3.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/xnec2c-1.4-3.fc15
Package xnec2c-1.4-3.fc15: * should fix your issue, * was pushed to the Fedora 15 testing repository, * should be available at your local mirror within two days. Update it with: # su -c 'yum update --enablerepo=updates-testing xnec2c-1.4-3.fc15' as soon as you are able to. Please go to the following url: https://admin.fedoraproject.org/updates/xnec2c-1.4-3.fc15 then log in and leave karma (feedback).
xnec2c-1.5-1.fc15 has been submitted as an update for Fedora 15. https://admin.fedoraproject.org/updates/xnec2c-1.5-1.fc15
xnec2c-1.5-1.fc15 has been pushed to the Fedora 15 stable repository. If problems still persist, please make note of it in this bug report.