Original WW2 German FF33 Field Telephone Switchboard Ubertrager Transformer 1x
$250.00
1 in stock
Description
You only receive 1x per purchase. The section on cable describes that both single and double wire connections could be used, sometimes in a single line. The transfer from single to double cable connection requires an insulation transformer. This transformer was called the “Übertrager” or telephone transformer. It consisted of a wooden box with external connections containing a heavy ring-core transformer. Both primary and secondary windings are executed in two halves with mid point connections. In this way the transformer can act both as an insulation transformer and as a Balance-Unbalance transformer. The dimensions of the transformer are chosen quite large to allow the strong bell currents to be passed through without distortion. On the top of the Übertrager are four large and four small screw connectors. Instead of the large screw connectors, two sockets for interconnection cables, placed on the side of the unit, can be used. The smaller connectors have jumpers fitted. When not in use the Ubertrager was stored in a leather carrying case. The Übertrager also allowed an additional connection to be made over a two-wire line. In this case the signal from phones “A” will flow as differential mode current through the two wires while the signal from phones “B” will flow as common mode current through the two wires and return via earth. In the properly balanced line, users
“A” and “B” can not hear each other. “B” could also be used for telex.
Complete and working.
