User's Manual
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19541P‐42(02‐11)
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IntercomInterface
TheU9921‐GUVisdesignedtoaddwirelesscapabilitytoanexistingwiredintercom.Connection
totheintercomisaccomplishedbyconnectinganinterfacecabletotheinterfaceconnectorof
theU9921‐GUV(seeFigure1).ThefollowinglistcontainsDavidClarkintercomsystemsthat
havebeentested
toworkwiththeU9921‐GUVandtherequiredcableassembly.
Table1:IntercomInterfaceCableAssemblies
DavidClarkIntercom CableAssemblyRequired
U3800VehicularIntercomSystem C99‐22MS(40935G‐08)
U9800MarineIntercomSystem C99‐20CX(40935G‐07)
U9500MarineIntercomSystem C99‐20LL(40935G‐06)
U3400PortableIntercomSystem
U3100ModularIntercomSystem
C99‐20MS(40935G‐05)
TheU9921‐GUVwilldetectthecableassemblieslistedaboveandautomaticallymakethe
necessaryaudioleveladjustmentsforthecorrespondingintercom.
Mounting
TheU9921‐GUVmaybeflushmountedorsurfacemountedusingtheincludedgasket,nut,and
bracket.SeeFigure1formountingsuggestions.
Note:
Bracketnotusedforflushmountapplications.Bracketmountingconfigurationmaybe
reversedforvaryingrequirements(e.g.,vehicledashvs.ceiling‐mount.)
Antenna
TheU9921‐GUVhasaninternalantenna.Anexternalantennamaynotbenecessarybutthe
antennaconnectorisprovidedforeithe rtheincludedwhipantennaor
anoptionalremote
antennakit(P/N:40688G‐93).
Chooseanopen,clearlocationfortheremoteantennaandroutethecoaxialcableawayfrom
anybusyareas,preferablybehindpanelsorinconduits.
Thisdevicehasbeendesignedtooperatewiththeantennaslistedbelow,andhavinga
maximumgain
of3dB.Antennasnotincludedinthislistorhavingagaingreaterthan3dBare
strictlyprohibitedforusewiththisdevice.Therequiredantennaimpedanceis50ohms.
Acceptableantennasforusewiththisproduct:
• WhipAntenna(P/N:40688G‐92)
• RemoteAntennaKit(P/N:
40688G‐93)