User's Manual

CHAPTER8
ANTENNASETUPS 
Revised: 25 Jan 17 8-5 ESTeem Horizon Series
WEATHERPROOFINGCOAXCONNECTIONS
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1. Lightlycoatthethreadsoftheconnectorswithsiliconelubricantpriortoassembl y(SeeNote1)andhandtighten.Make
suretousethesiliconsparinglysowhenassembled,anyex ce s s doesnotgetoncenterconductor.Careshouldbetaken
nottogetanylubricantonthecenterconductor.
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2. Wraptheconnectora
ssemblywithanon‐adhesivesiliconetape,ESTpartnumberAA243,forweather proofing(SeeNote
2andinstructionsbelow).
a) Cleansurfacetobewrapped.Cutofflengthtobeused.
b) Peelbackashortlengthofprotectivefilm.Keeptapecleananddry.
c) Beginwi
thonecompleteoverlapoftapeontoitself.
d) STRETCHCoaxWrapwhilecontinuingtowrapobjectwith“hal f‐laps”,removingclearfilmasyougo(Figure1).For
greaterpressureresistance,use2ormoretightlywrappedlayers.
e) Endoftapeatfinalwrapshouldbecompletelypositionedon
toitself.
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Note:CoaxWr ap’s bondbeginstocureimmediatelyuponcontactwithitself.Repositioningor
removalisnotrecommendedafter2minutesofwrapping.
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3. Applyanelectricalcoating(sealingagent),overthevaporbarrierpatchforadded
protection(SeeNote3).
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NOTES:
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1. DowCorningRTV‐3140orequ
ivalent.
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2. CoaxWrap,CW10Borequivalent.
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3.SCOTCHKOTE,3‐MCompany,orequivalent.
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ANTENNADIVERSITY
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ThedualdiversityantennaconfigurationontheHorizonallowstheradiotooperatemoreefficientlyinareaswithhighreflections
(suchasindoorsorinacity)withoutdirectlineofsight(LOS)betweentheantennas.Oneofthemostdifficultconditionstocontrol
inaradiosystemistheeffectofadestructiveref
lectedradiosignalcalledmutipathing.Multipathingoccurswhenwavesemitted
bythetransmittertravelalongadifferentpathandinterferedestructivelywithwavestravelingonadirectline‐of‐sitepath.The
phenomenonoccursbecausewavestravelingalongdifferentpathsmaybecompletelyoutofphasewhentheyreachthe antenna,
thereby canceling each other out.The dual diversity antenna configurationplaces a ph
ysical distance between the antennas
whereonereflectedsignalwillbeoutofphase,butthesecondwillbenot.TheESTeemHorizonwillsamplebothantennasand
selectthebestreceivesignal.Bothantennapo
rts areactivebydefaultintheHorizonseries.
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