At 9/24/2010 05:03 PM, Brian Webster wrote: >Fred, > Have you actually studied some locations that might > be in this situation and computed the HAAT using the tool on the > FCC web site or some other HAAT calculation tool? If you look at a > calculation for a site such as my office which is at 1420 above sea > level and the valley floors around me typically at around 1170 > AMSL, my location still has a negative HAAT of 47 meters even using > a 10 meter antenna height! This is because there are other hills > around me that are at my elevation or taller out each radial to > 16km. I have pasted the text of a HAAT report from Radio Mobile so > you get an idea of how the calculations are run. I believe you said > you are in Western Mass. Your terrain is not much unlike my part of > upstate NY. You can paste my address in to Google Maps and turn the > terrain feature on to get an idea of the terrain around me. Unless > your client is actually at the top of the highest peak within 16 KM > of itself, there is a high likelihood that the HAAT will be within > the limits and possibly at a negative number
Yes, I actually used RadioMobile's HAAT calculator. I recently did a study on five towns in Western MA. (It's not where I am, but I designed some stimulus fiber that's about to be built there, so I wanted to see what a WISP could do with it, since that's what it was designed for.) Two of the towns are mostly valley; the houses aren't on the high ground. In those two towns, a few areas with homes were still >75m AAT, but they're fairly small. In three towns, big sections of town were excluded. One lost the town center (that's why it's called a hill town). One lost the school, the nearby neighborhood, and a couple of other population clusters representing, all told, a big part of the town. The third lost part of the town center and a couple of outlying neighborhoods -- there's a big American Tower site near the center, which is the best place for an access point, but some homes down the hill are still in the banned zone. 75 meters is not very high when the local terrain varies by about a thousand feet. You don't need to be on top of the hill, just have the valleys in your eight radials. > >Brian > >214 Eggleston Hill Rd. >Cooperstown, NY 13326 > >Height Above Average Terrain >Report generated at 4:57:42 PM , 9/24/2010 >------------------------------------------------------------ >Antenna geographic coordinates >42°36'04"N,074°55'37"W >FN22MO >Ground elevation: 436.5m >------------------------------------------------------------ >Antenna height above ground: 10m >------------------------------------------------------------ >Azt(°) D(km) Ground elevation(m) >000 03.00 0508.1 >000 03.26 0529.2 >000 03.52 0548.8 >000 03.78 0569.6 >000 04.04 0581.2 >000 04.30 0590.4 >000 04.56 0590.8 >000 04.82 0606.3 >000 05.08 0590.9 >000 05.34 0547.3 >000 05.60 0513.9 >000 05.86 0482.1 >000 06.12 0447.3 >000 06.38 0408.5 >000 06.64 0405.3 >000 06.90 0389.6 >000 07.16 0388.0 >000 07.42 0398.1 >000 07.68 0406.3 >000 07.94 0424.9 >000 08.20 0447.0 >000 08.46 0443.0 >000 08.72 0393.4 >000 08.98 0369.4 >000 09.24 0371.1 >000 09.50 0377.5 >000 09.76 0375.8 >000 10.02 0365.6 >000 10.28 0363.9 >000 10.54 0377.0 >000 10.80 0377.0 >000 11.06 0375.2 >000 11.32 0372.7 >000 11.58 0363.9 >000 11.84 0362.0 >000 12.10 0364.4 >000 12.36 0376.9 >000 12.62 0379.1 >000 12.88 0373.0 >000 13.14 0370.7 >000 13.40 0378.3 >000 13.66 0380.6 >000 13.92 0394.0 >000 14.18 0388.5 >000 14.44 0423.8 >000 14.70 0440.4 >000 14.96 0431.8 >000 15.22 0429.5 >000 15.48 0431.9 >000 15.74 0430.2 >000 16.00 0432.9 >000 Average 433.08m >000 HAAT 13.42m >045 03.00 0451.4 >045 03.26 0420.8 >045 03.52 0397.6 >045 03.78 0370.2 >045 04.04 0368.5 >045 04.30 0363.9 >045 04.56 0365.0 >045 04.82 0361.4 >045 05.08 0360.0 >045 05.34 0367.0 >045 05.60 0378.3 >045 05.86 0379.8 >045 06.12 0387.5 >045 06.38 0428.0 >045 06.64 0438.8 >045 06.90 0408.4 >045 07.16 0430.0 >045 07.42 0434.8 >045 07.68 0474.9 >045 07.94 0514.4 >045 08.20 0519.7 >045 08.46 0523.5 >045 08.72 0498.6 >045 08.98 0464.7 >045 09.24 0492.5 >045 09.50 0516.1 >045 09.76 0541.8 >045 10.02 0533.7 >045 10.28 0525.6 >045 10.54 0537.8 >045 10.80 0555.9 >045 11.06 0566.9 >045 11.32 0586.8 >045 11.58 0588.2 >045 11.84 0575.1 >045 12.10 0580.7 >045 12.36 0585.8 >045 12.62 0597.1 >045 12.88 0601.9 >045 13.14 0588.7 >045 13.40 0600.3 >045 13.66 0632.1 >045 13.92 0639.5 >045 14.18 0590.7 >045 14.44 0575.5 >045 14.70 0561.4 >045 14.96 0543.4 >045 15.22 0575.8 >045 15.48 0592.8 >045 15.74 0556.4 >045 16.00 0536.3 >045 Average 499.73m >045 HAAT -53.23m >090 03.00 0566.1 >090 03.26 0581.7 >090 03.52 0560.7 >090 03.78 0552.0 >090 04.04 0582.2 >090 04.30 0626.1 >090 04.56 0639.3 >090 04.82 0629.2 >090 05.08 0659.9 >090 05.34 0685.0 >090 05.60 0635.6 >090 05.86 0588.6 >090 06.12 0558.4 >090 06.38 0554.8 >090 06.64 0586.4 >090 06.90 0556.3 >090 07.16 0492.4 >090 07.42 0474.1 >090 07.68 0496.9 >090 07.94 0507.5 >090 08.20 0457.9 >090 08.46 0412.6 >090 08.72 0406.6 >090 08.98 0430.8 >090 09.24 0472.3 >090 09.50 0585.2 >090 09.76 0649.9 >090 10.02 0639.7 >090 10.28 0665.6 >090 10.54 0696.1 >090 10.80 0619.2 >090 11.06 0586.4 >090 11.32 0591.5 >090 11.58 0541.9 >090 11.84 0495.6 >090 12.10 0493.0 >090 12.36 0532.2 >090 12.62 0558.3 >090 12.88 0551.5 >090 13.14 0553.0 >090 13.40 0573.6 >090 13.66 0535.2 >090 13.92 0477.9 >090 14.18 0429.9 >090 14.44 0418.5 >090 14.70 0462.3 >090 14.96 0485.2 >090 15.22 0492.4 >090 15.48 0496.8 >090 15.74 0510.8 >090 16.00 0522.3 >090 Average 546.62m >090 HAAT -100.12m >135 03.00 0574.4 >135 03.26 0565.4 >135 03.52 0586.3 >135 03.78 0582.6 >135 04.04 0567.3 >135 04.30 0534.8 >135 04.56 0479.7 >135 04.82 0466.2 >135 05.08 0516.6 >135 05.34 0576.7 >135 05.60 0588.9 >135 05.86 0575.2 >135 06.12 0558.2 >135 06.38 0525.6 >135 06.64 0535.3 >135 06.90 0565.8 >135 07.16 0597.3 >135 07.42 0626.1 >135 07.68 0617.3 >135 07.94 0547.5 >135 08.20 0481.4 >135 08.46 0448.4 >135 08.72 0468.3 >135 08.98 0397.0 >135 09.24 0377.4 >135 09.50 0377.0 >135 09.76 0377.0 >135 10.02 0391.9 >135 10.28 0461.2 >135 10.54 0551.1 >135 10.80 0600.9 >135 11.06 0596.0 >135 11.32 0595.5 >135 11.58 0610.6 >135 11.84 0631.1 >135 12.10 0638.7 >135 12.36 0624.0 >135 12.62 0605.4 >135 12.88 0595.0 >135 13.14 0592.9 >135 13.40 0575.9 >135 13.66 0565.4 >135 13.92 0561.2 >135 14.18 0566.6 >135 14.44 0573.7 >135 14.70 0559.2 >135 14.96 0550.6 >135 15.22 0556.0 >135 15.48 0548.9 >135 15.74 0443.1 >135 16.00 0396.1 >135 Average 539.31m >135 HAAT -92.8099999999999m >180 03.00 0391.6 >180 03.26 0420.6 >180 03.52 0418.2 >180 03.78 0491.9 >180 04.04 0549.9 >180 04.30 0575.4 >180 04.56 0567.3 >180 04.82 0566.4 >180 05.08 0575.2 >180 05.34 0578.0 >180 05.60 0574.8 >180 05.86 0572.8 >180 06.12 0568.1 >180 06.38 0566.8 >180 06.64 0557.3 >180 06.90 0548.5 >180 07.16 0550.8 >180 07.42 0561.0 >180 07.68 0563.4 >180 07.94 0551.6 >180 08.20 0531.8 >180 08.46 0508.8 >180 08.72 0472.6 >180 08.98 0441.9 >180 09.24 0452.7 >180 09.50 0466.9 >180 09.76 0464.8 >180 10.02 0463.9 >180 10.28 0447.1 >180 10.54 0396.0 >180 10.80 0352.5 >180 11.06 0347.3 >180 11.32 0350.1 >180 11.58 0355.3 >180 11.84 0371.0 >180 12.10 0386.5 >180 12.36 0431.8 >180 12.62 0518.1 >180 12.88 0532.2 >180 13.14 0530.0 >180 13.40 0530.8 >180 13.66 0541.6 >180 13.92 0546.8 >180 14.18 0546.8 >180 14.44 0534.6 >180 14.70 0511.5 >180 14.96 0483.9 >180 15.22 0473.5 >180 15.48 0477.9 >180 15.74 0493.0 >180 16.00 0483.2 >180 Average 494.01m >180 HAAT -47.51m >225 03.00 0419.7 >225 03.26 0482.1 >225 03.52 0466.9 >225 03.78 0458.0 >225 04.04 0453.1 >225 04.30 0426.9 >225 04.56 0445.7 >225 04.82 0439.1 >225 05.08 0482.1 >225 05.34 0478.6 >225 05.60 0436.4 >225 05.86 0413.0 >225 06.12 0401.0 >225 06.38 0408.6 >225 06.64 0443.1 >225 06.90 0451.2 >225 07.16 0477.2 >225 07.42 0478.0 >225 07.68 0452.7 >225 07.94 0412.7 >225 08.20 0458.7 >225 08.46 0461.3 >225 08.72 0458.6 >225 08.98 0441.7 >225 09.24 0486.0 >225 09.50 0496.2 >225 09.76 0465.2 >225 10.02 0447.6 >225 10.28 0444.9 >225 10.54 0478.7 >225 10.80 0479.0 >225 11.06 0480.9 >225 11.32 0486.0 >225 11.58 0536.8 >225 11.84 0568.0 >225 12.10 0570.8 >225 12.36 0582.9 >225 12.62 0577.1 >225 12.88 0584.0 >225 13.14 0574.0 >225 13.40 0539.7 >225 13.66 0506.0 >225 13.92 0473.9 >225 14.18 0450.0 >225 14.44 0456.7 >225 14.70 0480.0 >225 14.96 0504.2 >225 15.22 0537.7 >225 15.48 0541.8 >225 15.74 0522.0 >225 16.00 0505.7 >225 Average 480.83m >225 HAAT -34.33m >270 03.00 0447.9 >270 03.26 0459.2 >270 03.52 0414.2 >270 03.78 0445.7 >270 04.04 0449.4 >270 04.30 0527.4 >270 04.56 0545.2 >270 04.82 0516.4 >270 05.08 0539.8 >270 05.34 0530.5 >270 05.60 0526.8 >270 05.86 0534.8 >270 06.12 0523.9 >270 06.38 0512.9 >270 06.64 0513.3 >270 06.90 0518.4 >270 07.16 0543.6 >270 07.42 0554.7 >270 07.68 0563.0 >270 07.94 0563.7 >270 08.20 0560.2 >270 08.46 0539.6 >270 08.72 0529.1 >270 08.98 0499.8 >270 09.24 0473.9 >270 09.50 0442.1 >270 09.76 0395.6 >270 10.02 0373.7 >270 10.28 0366.9 >270 10.54 0364.0 >270 10.80 0369.2 >270 11.06 0415.6 >270 11.32 0467.3 >270 11.58 0418.9 >270 11.84 0380.5 >270 12.10 0374.4 >270 12.36 0411.8 >270 12.62 0459.8 >270 12.88 0498.0 >270 13.14 0486.9 >270 13.40 0491.4 >270 13.66 0512.2 >270 13.92 0520.7 >270 14.18 0511.6 >270 14.44 0503.5 >270 14.70 0511.0 >270 14.96 0472.1 >270 15.22 0464.7 >270 15.48 0481.7 >270 15.74 0493.2 >270 16.00 0515.5 >270 Average 481.09m >270 HAAT -34.59m >315 03.00 0353.0 >315 03.26 0369.3 >315 03.52 0369.6 >315 03.78 0356.9 >315 04.04 0364.9 >315 04.30 0372.3 >315 04.56 0399.6 >315 04.82 0396.3 >315 05.08 0418.0 >315 05.34 0449.6 >315 05.60 0474.4 >315 05.86 0536.3 >315 06.12 0538.4 >315 06.38 0507.0 >315 06.64 0492.2 >315 06.90 0489.5 >315 07.16 0502.2 >315 07.42 0500.5 >315 07.68 0547.3 >315 07.94 0536.6 >315 08.20 0512.4 >315 08.46 0516.3 >315 08.72 0538.2 >315 08.98 0536.4 >315 09.24 0530.2 >315 09.50 0531.1 >315 09.76 0573.3 >315 10.02 0576.9 >315 10.28 0578.8 >315 10.54 0567.8 >315 10.80 0548.1 >315 11.06 0507.3 >315 11.32 0494.0 >315 11.58 0495.9 >315 11.84 0470.9 >315 12.10 0461.2 >315 12.36 0478.1 >315 12.62 0529.2 >315 12.88 0494.3 >315 13.14 0442.3 >315 13.40 0439.5 >315 13.66 0450.7 >315 13.92 0435.0 >315 14.18 0449.4 >315 14.44 0461.9 >315 14.70 0476.9 >315 14.96 0494.0 >315 15.22 0497.0 >315 15.48 0479.3 >315 15.74 0457.6 >315 16.00 0456.6 >315 Average 479.5m >315 HAAT -33m >------------------------------------------------------------ >Antenna elevation above sea level : 446.5m >Average ground elevation above sea level: 494.27m >------------------------------------------------------------ >HAAT: -47.77m > > >-------------------------------------------------------------------------------- >WISPA Wants You! 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