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It is IqmmtQlive of the ,wc.sa Cmst' of Nlmh
America and Northern Eurnpc
TRC sir has water. hat tarain. c7EIp rwunraimsls
tcmin (Olympic Peninsular) in iLo vicinity
Terrain daw (3 orc-second) is nvnikblc I
The cmdirulcs of Scd Rock. WA FE /39*:43' N 0d
122':53' W. A map of the ma in thr pnimily of W
Rock. WA is shown in Fig. 4, and o twcbdiincnsd
topgraphic plot with on tours is shown in FiB. 5.
5.2 3-5 Vkn of Ttrrain Arta i
A 3-dimensional plot of the arca (1 7x20 mi? shown in
Fig. 5 presented in Fig. 6. Thc nmh-wmt vkw shows
consmt - elcvation above mean sea kval (AMSL)
contom. (Note that the vcnicd scdc is injeer, ant! &e
horizond scala are in miles.) From tap9qical phu of
Figs. 5 md 6 it cm k sccn hi thcm is water with a few
isbnds to cast of LRC site, but Imd nmil s!ogp81y rising
mountain3 to the wca The highcss mmnnim IC U, lDtr
9.4 Eft?& ad YQ~TCI~Q on Covcrsnc
The cflccl of Pmppcln mrinh on covcqc is shown in Fig.
9 at M GWa. A rcghncwnutivc satcllir elcvation of 20'
nn8 tmhd mlcnna clcva~on of I ft AMSL (e.g. for a
wuhmauircr tmirind) wcm nssunocd. Radial tcnain dm
as &scriM abvc was uscd. FacR cuwc is an qui-ficld
sape~lgih ca;rat~. LSE Idh~ls of &C cmtour me rclativc
walm in dB'o; lBte &duk volw is meulinglcss.
Bullingum mtbd wm u.d IO compute the obstruction
Ims. VOrr a@lh Ims is &Ecrmincd by tk degrcc to which
obslplcction.~ pmmr tk Frevlcl 7me. Efrcct of tfre
munuins (Olympic Rninsular) IO thc rranh-wcst of Scat
Rock on pmpgmlion md coverage is cvidcnt fmc Fig. 9.
rig. IO is similar lo Fig. 9, cxccpl that the anlcnna hcight
kc k n irccmwd by 60 ft. A compmson of - 120 and
-I 14 dB signal COI(NWI in Figs. 9 mnd 10 rcspcctivcly
shows that signal lcwcl 81 givcn distance incrca.d by
owximaacly 0 dB with LOIC incrca.. in antcnra hcight.
AS expcclct9 CDLtrc is r ) relief ~ in propagation loss in the
ronoI wesaerly diresib.
YPIC field campmiam in Figs. 9 and IO do not include
the CfkCls Obi?Iuh@Mh 0.r foliage. The signal pnhhility
distribution will &pnd on the c;uLh terminal
surroundings. Indad it is conjcclurcd that as the satcllik
kgins U) cmc into view and riscs the signal statistics
will cbngc from 1%-nml shadowing IO Hoylcigh to
RQian p&ability disuibulions.
To summarPi*. lDtz distant irregular bamrn lcrrain even
w h it is s&?p h p m elevstim of IO' only and dots no(
no~hwestorSealWock.~~someor~~~~~~
6000 dwc L)rz Iloacllile wgulav (elevation) view. The
It high.
imgular termin however invoduces an obstruction loss
as hwn in Figs. 9 md IO. Morc impomnl arc thc lcnain
53 Ttrraia Radiola
md foliage ckmrr&cs in LRe fmmrdiarr vicinity of
For the pu-s of propag31ion mlyois it is nwwe
thz! termsipid ontenria; eplecu of Lhcsc arc considatd in
appropriate IO examine the lcrrain dam Ucw the relcvant
Ihc following scclh.
azimuths. (NoccO'orMO'a.zirndthc~~~~~Nonlh.