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Valcom VMT-1 User Manual
Also see for VMT-1: Product guide
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Issue 01 947993ShortingJumperHI Z Out600-OHMInputHI Z OutSHLD CTS hortingJum per inN orm alP ositionH I Z O ut60 0-O H MInputH I Z O utS h ield6 00-O H M B a lan ce dLine Inpu tT o A u x. In putof A m plifierP honoP lu gP honoP lugO RNORMMICS H L D C TVMT-1INPUT MATCHING TRANSFORMERCONNECTIONSThe VMT-1 matches 500-600 Ohm lines to eithera high impedance input or output of an amplifier.It may be used to connect audio page ports oftelephone systems to most 70 Volt amplifiers.The VMT-1 provides an impedance matchbetween a 500-600 Ohm balanced line andauxiliary high impedance input or 25 Volt outputof an amplifier.Figure 1Connection to an auxiliary input of an amplifier ismade using a standard phono patch cable orscrew terminals. Connection to a 500-600 Ohminput is made to screw terminals. A shortingjumper is available when the unit is used toconnect a high impedance output to themicrophone input of an amplifier.DIMENSIONS/WEIGHT• 1.75" H x 3.75" W x 1.25" D(4.45cm H x 9.53cm W x 3.2cm D)• 0.5 lbs. (.23 kg)Figure 2 shows the VMT-1 used toconnect a 600 Ohm balanced line to the auxiliaryinput of a commercial 70 Volt amplifier. If theamplifier uses phone jacks for auxiliary inputconnections a patch cable with male phono endsmay be used for the connection. Shielded singleconductor wiring is used when the amplifier isequipped with screw terminal connections.Figure 2 Input Matching TtransformerTo connect a 600 Ohm line to a ¼microphone input of an amplifier move theshorting jumper to the lower 2 header pins on theunit. The connection the amplifier may be madeusing a standard patch cable with phono plugsand a ¼” male/phono jack adapter. |
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