Bogen WMT-1A User's Manual
Contents
1. NJ 07446 201 934 8500 without notice2. BOGEN COMMUNICATIONS INC LINE INPUT LINE OUTPUT MATCHING TRANSFORMER MODEL WMT 1A The Bogen WMT 1A line input line output matching transformer is de signed to match either a high impedance input or output of an amplifier to a 500 600 ohm line It may be used to connect telephone systems to most Bogen public address amplifiers or for distributing background music that is transmitted over leased telephone lines The unit also functions as an output matching transformer to feed program material over a 500 600 ohm telephone line for transmission to a local broadcast studio The WMT 1A provides an impedance match between the 500 600 ohm balanced line and the high impedance auxiliary input of the amplifier or the 25 volt output of the amplifier The 500 600 ohm line input or output connections are made to a screw terminal strip Connection to the amplifier is provided by a shielded cable terminated in a phono plug Mounting flanges are provided to mount the WMT 1A to the amplifier chassis or backboard No wiring or soldering is required for making connec tions in most cases A jumper wire is easily repositioned when connecting the WMT 1A high impedance output to the MIC input of the amplifier Frequency Response 50Hz to 20 000Hz 2dB Sensitivity Less than 0 1 volt across 600 ohm line required for full output power from average amplifier Maximum level 20dBm Output Approximately 1 73 volts output when connected across 25
3. e WMT 1A through the phono plug to the MIC input terminal on the amplifier To connect to terminal strip type inputs clip off the phono plug and connect the shield to the ground terminal and the center conductor to one of the remaining terminals 500 600 OHM BALANCED LINE INPUT RCA 1 4 SWITCHGRAFT 343 OR EQUIV NORMAL INPUT OUTPUT POSITION JUMPEA POSITION FOR MIC INPUT Figure 2 WMT 1A Jumper Placement for Microphone Input Applications OUTPUT MATCHING TRANSFORMER To match the output to a 500 600 ohm line proceed as follows 1 Connect the 500 600 ohm tine to the terminal board on the WMT 1A For a baianced line the shield is connected to the center terminal 2 Insert the phono plug of the WMT 1A into the receptacle marked WMT 1A HI Z OUTPUT on the amplifier chassis If this receptacle is not available remove the phono plug from the WMT 1A cable and make connections to the 25 volt output of the amplifier Connect the center lead of the cable to the output terminal marked 25V and the shield to COM or ground Note When the WMT IA is used as a bridging output it does not draw any power from the amplifier 500 600 OHM FROM WMT 1A Hi Z BALANCED RECEPTACLE LINE OUTPUT OFAMPLIFIER 500 600 BALANCED LINE INPUT 74 1379 O1 A Figure 4 WMT 1A Schematic Diagram Printed in U S A BOGEN COMMUNICATIDNS INC All specifications 54 5215 14 60 SPRING STREET P O Box 575 subject to change 8909 RAMSEY
4. volt output tap or WMT 1A HI Z output connection on Bogen amplifier Overall Dimensions 2 3 8 H x 2 W x 1 1 4 D 6 0 x 5 1 x 3 2cm Weight 4 oz 11kg INPUT MATCHING TRANSFORMER To match the input from a 500 600 ohm line proceed as follows 1 Connect the input from the 500 600 ohm line to the termina board on the WMT 1A For a balanced line the shield is connected to the center terminal 2 Insert the phono plug of the WMT 1A to a high impedance receptacle on the amplifier usually the AUX receptacle 3 If the AUX input is already in use the WMT 1A phono plug may be connected to one of the MIC inputs of the amplifier after following the instructions below for MODIFICATION FOR MIC INPUT Note With amplifiers which utilize a fader type volume control for two AUX channels it is advisable to connect the WMT 1A to a MIC input even though only one of the AUX inputs is in use 500 600 OHM TO AUX INPUT BALANCED OF AMPLIFIER LINE INPUT Figure 1 Connecting WMT 1A as Input Matching Transtormer MODIFICATION FOR MIC INPUT The WMT 1A includes a jumper wire connection to permit it to feed into a microphone input The input may be Hi Z or Lo Z balanced orunbalanced The circuit uses a 150 ohm resistor to divide the signal down to one hundredth of that normally obtained from the secon dary Refer to Figure 2 for jumper wire location and position 2 Figure 2 shows the use of an adaptor to connect the output of th
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