Qtech-data-systems DATRAN Q80 Telemetry Radio Manual de usuario descargar pdf (Pagina 13)

CONN

CONNCONN

CONNECTIONS

ECTIONSECTIONS

ECTIONS

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Radio Aerial

Radio AerialRadio Aerial

Radio Aerial

TheMaxonRadioRx/TxRFconnectorislocatedonthefrontpaneloftheQ80Module.Thisconnectorisa50

ohmBNCconnector.TheQ80Moduleisnotsuppliedwithanaerial.QTechsupplyanumberofsuitableaerials;

pleasecontactusforfurtherdetails.

Suitableaerialsincludewhips,foldeddipolesandyagis.Theaerialusedmustpresent50ohmstotheQ80Module

BNC RF connector at the operating frequency.  The RF output of the Q80 Module is unbalanced referenced to

ground.  Therefore folded dipoles and yagis will require a suitable unbalance to balanced impedance matching

balum.

Note Allaerialssuppliedby

QTech

haverequiredbalumspre-installed.

QTech’s aerial range are generally supplied with 6m of coaxial cable “tail” is RG58. In applications where the

supplied6metrecoaxialaerialcableisnotsuitable,site-specificcablescanbeconstructed.Thesecableshould

beconstructedusinggoodquality50ohmBNCconnectorswithcrimpedferrules.

Note TV75ohmBNCconnectorshaveasmallercentrepin.Ifused,thesewillcauseanimpedancemismatch

andnotmateproperlywiththeQ80ModuleRFBNCconnector.

ThecableusedtoconstructtheaerialcableshouldbegoodqualityRG58/UorRG213/Ucoaxialcable.Forcable

lengthsgreaterthan6metresatUHFfrequenciesRG213/Ucoaxialcableshouldbeused.

All connections to the coaxial cable should be sealed against moisture ingress and the aerial cable routed and

securedinawaysoastopreventmechanicaldamageandeliminatetightbends.

ThecompletedaerialsystemshouldbecheckedforVSWRwithasuitableVSWRmeter.TheVSWRshouldbe

betterthan1to1.5.

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Qtech-data-systems DATRAN Q80 Telemetry Radio Manual de usuario Pagina 13