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,..,�n:. ,. ...., . ., :... ,, r - �,t�� � <br /> — -i^ '.F;^.r d• o., . ^ti i4. 'r ..a <br /> _ ,-: .�, :'�n' „ ' �' '�_ _��:. .,..�.��,s.m..^` -� .%yi�._u<.�,. <br /> _ � �.__...,_ . .. -.__, ., . . . •.. . .. <br /> ' ' 02-0?-89`03:21AbI� MOTOROLH C:.E SFiLES MDRLE PGi� �* <br /> � February 7, I989 <br /> To: Rick Donahus <br /> From: David Dombrowski <br /> Midwestern Are�Systems Enqineer <br /> Subject: City of D�catu=. Decatur. IL - Coveraqe Predictions. <br /> Rick. <br /> The predicted coveragQ mapa. J081000 thrv JOH10@5, were <br /> d s i nif icant lv <br /> a number of ar=maters which ha e q _ <br /> performed us inq p <br /> reduced the display¢d coverage area. To be apecific, the <br /> fallowing aseumptionc may havQ b�een cavse fer red�ced <br /> coverage: . , <br /> * Accotding to. the d.S. For��t Sarvica. Macon County <br /> consists of approximately 6� tre�s tas an average and <br /> doe� not. indicatQ density of trees in any particular <br />, area) . The raquired 8 dB of tree Ioss may be a bit <br /> hiqh far the spa=�ity of tress indicatad. <br />, � The preecribed "Suburban" environmental 1056 may n�t <br />' a 1 to all areas of ra uested coverage. <br /> FP Y <br /> Q <br /> I� <br />�; * The losaes associatad with a portable SMA <br /> < Sgeaker/Antenna/Mic) in-vehicle. . talkinq back to the <br /> base i� much qreater than that associated with a <br />' portable BMA, out�ide a v�hicls talking back to the <br /> bacQ. <br />� � � ThQ propas�d Motorola repQaters are capablQ ot much <br /> better receiver sensitivity than the requized 1. 00 <br /> microvoltg. This alons can improve the talk-back <br /> ranqe by several dB. <br />. In summary. Motorela' s exparianc� and extensive research in <br /> r. f. coveraqe pr�dictions has produced input paramet�rs which <br />' dittar from those used on ths abova menticned maps. I <br /> recommend we compar� covarags predictions based on our data <br /> and actual li�ld survay rs:u2t� with the maps abovs before. <br />� submitting z linal output. <br />� If you have any quQstions pleaca call me at c 312>-350-3533. <br /> Re d� /�� <br /> f�l <br /> David Dombrowski <br />