Specifications

Maxiva ULX Series

November 11, 2013

d‐5

888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.

Figure d-6 Surge Protectors and Ferrite Chokes

d.3 What Can Be Done?

Installationofthetransmitterbuilding,antennatuningunitifapplicable,andantennashouldbedonesothatthe

riskofdestructionduetolightningisminimalandtheefficiencyoftheoverallsystemismaximized.Todothis,

separategroundsystemsshouldbeinstalledforthebuildingandantenna.This

forcesalloftheRFreturncurrentsto

flowinthetransmissionlineshield.Thecoaxcanbeburiedbelowtheantennagroundplanetostillfurtherreduce

theRFcurrentcoupledtoit.

Inmediumandshortwaveinstallationstheantennagroundplaneisveryimportantasitisoftheradiatingelement.

RFcurrentleavingtheantennamustreturnviathegroundpath(groundwave).Forthisreasonthe“antenna

couplingunit”mustbeclosetothebaseofthetowerandsecurely

connectedtothegroundplane.

Figured‐7showsthebasicelementsofaproperlydesignedant ennasystem.

• Goodgroundplane.

• Ballgapontower.

• Seriesinductorintowerfeeder.

• Antennacouplingunitconnectedtoantennaground.

• ThecircuitisequivalenttothenormalTeeusedbyHarris.

• Undergroundcoax.

• Guywirelengthbrokenbyinsulatorsandgroundedatthebottomend.

Thetransmitterbuildingmustbegivenextraprotectiontoinsurereliableequipmentoperation.Alowimpedance

safetygroundsystemmustbeinstalledusing3inchwidecopperstraphardsolderedatalljointsandconnectedto

multiplegroundrodslocatedattheperimeterofthebuilding.Thegroundrodsshouldbe

wettomakegood

connectiontotheearthwatertable.Allequipmentcabinetswithinthebuildingmustbeconnectedtotheground

strapsforsafetyreasons.