David Bogen Co., Inc. 3A Communo-Phone
Model: | 3A Communo-Phone |
Manufacturer: | David Bogen Co., Inc. |
Schematic Pages
Schematics Content
Page 1:
Power Rating:
Master Unit only, 210 volts, A.C. or D.C., consumption, 35 watts,
Remote Units, no power -D.C. connection.
The model 3A Bogen Selective Communo - Phone provides selective communication between the Master Station and one to four Remote Stations.
Connections: Using a two wire cable connect all the Remote Units so that their # 1 terminale connect to # 5 on the Master Unit. Then the remaining wire from each Remote Unit (Terminal # 2) connects to its own selective terminal numbered 1, 2, 3 or 4 on the Master Unit. Plug line cord into the usual power outlet. If the device is silent when first connected to Direct Current the power line plug should be removed and rotated so that it prongs are reversed this is done to correct the polarity.
Station Selector: The center knob is used to select the station called. It may be set to communicate with any single Remote station or to call all at once. It is normally left in the " Silent " position. The Master Station can listen in on any or all Remote stations without warning.
Talk - Listen: The lower knob automatically remains in the " Listen " position. When It is desired to speak from the Master Station the knob is pressed down to the " Talk " position. It must be released to hear the reply from the station called, Because of the sensitivity of the Remote Units it is not necessary for the person called to approach the box closer than about 20 feet, thus saving steps and interruption of work. The Remote Stations can only " Talk " or Listen when the Master switch is properly set,