System Description

SystemDescriptionandInstallationManualforRangeFinder ICD1000001
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Trytokeeptheantennas locatedatleast36”awayfromotherantennasontheaircraft.Theantennas
shouldbelocated as closeto the centerlineofthe fuselageas spaceallows,while tryingtokeepthe
antennasonaflatsurface.
Agroundplaneisrequiredfor
mostantennasappropriateforRangeFinder.Failuretoprovideagood
groundplanecanresultindegradationofantennaperformance.
Useanantennadesignedtobeusedwithaviationtransponders,withthecharacteristicsdocumented
inTable54.
Torque mating SMA connectors to: 7 10 lb∙in [80110
N∙cm].Take care not to overtorque the
antenna in an attempt to reduce a gap between the antenna and the mounting surface; torque the
antennatotheman ufacturer’sinstructions.
Note:Ifyourinstallationdoesnotmeetalloftheaboverequirements,RangeFinderperformance(range)may
behindered,
anddamagetotheRangeFindercouldresult.
Table54RangeFinderAntennaRequirements
5.5 Routingandconnectingtheantennacable
AttachyourantennacabletothebottomantennaSMAconnectorshowninFigure53.
AsuitableantennacableconsistsofamaleSMAconnector,alengthofcoaxialcable,andasuitableconnector
for your antenna. For example, if you are using a simple monopole antenna with a BNC
female conn ector,
yourantennacablewillneedaBNCmaleconnector.(SeeexamplecablepartinTable55.)
Table55AntennaCableConnectorParts
PartDescription Manufacturer PartNumber
SMAMaletoBNCMaleRightAngleCable24” Sagetech 101639
AntennaRequirements
Frequency 1030to1090MHz
Polarization Vertical
NominalImpedance 50Ω
VSWR <1.5:1between1030to1090MHz
RFPower 500WPeak
RadiationPattern Thegainmustnotbelessthanthegainofamatchedquarter wave stubminus
3dBover90percentofacoveragevolumefrom0to360degreesinazimuth
andfrom5to30degreesabovethegroundplanewheninstalledatthecenter
of1.2m(4foot)diameter(orlarger)flatcirculargroundplane.
MountingLocation
AsinglebottomlocatedantennaissupportedonRangeFinder.
Locateitasnearaspossibletothecenterlineofthefuselageandonthe
undersideofaircraftfuselage‐‐nominallyatthewingroot.
Locateantennatominimizeobstructiontoitsfields onthehorizon talplane.