Amtsanschließer 33

Discussions on the equipment used by the Axis forces, apart from the things covered in the other sections. Hosted by Juha Tompuri
User avatar
Rotwang M
Member
Posts: 50
Joined: 22 Jul 2021 20:10
Location: USA

Amtsanschließer 33

Post by Rotwang M » 17 Apr 2022 13:52

The Amtsanschließer 33 was an accessory that allowed German Feldfernsprecher 33 (FF33) field telephones to be used on the Zentralbatterie Betrieb (ZB) self-connection (SA) telephone network. The Amtsanschließer 33 could also be used to adapt an FF33 to operate on an Schlusszeichen Betrieb (SB) telephone exchange much like the SB Zusatz 33.

Image
The Amtsanschließer 33

Image
Telephone wire terminals.

The plug from one end of a double-ended patch cord is inserted into one of two sockets. The first socket, the switchboard socket (vertmittlungs-klinke), is accessed by removing the handset from the cradle. The other socket, the magneto socket (induktor-klinke), is between the cradle and the handset socket. The Amtsanschließer 33 handset has to be unplugged and removed from the cradle to plug the patch cord into the magneto socket. Once the patch cord is plugged into the magneto socket, the FF33 handset is placed in the cradle for SB operation (as will be explained later).

Image

The switchboard socket is used when the La and Lb/SA/ZB terminals are wired to operate the Amtsanschließer 33 on the SA/ZB network. During this operation, the Amtsanschließer 33 handset is left off the cradle. The FF33 handset can remain plugged into the FF33.

Image
The Amtsanschließer 33 in SA/ZB operation.

To use the Amtsanschließer 33 on an SB exchange, the telephone wires must be connected to the La and Lb/OB terminals. The handset of the Amtsanschließer 33 is unplugged and removed. The double ended patch cord is plugged into the FF33 and the magneto socket on the Amtsanschließer 33. The handset of the FF33 is set in the Amtsanschließer 33 cradle. Calls are answered by taking the FF33 handset off the Amtsanschließer 33 cradle and pressing the talk button in the handset. Upon completion of the call, the handset is placed back in the cradle, a circuit is completed, and the SB exchange is automatically alerted that the call has ended. To place a call, the magneto is cranked on the FF33 to signal the operator on the SB exchange.

Image
Magneto socket.

Image
The Amtsanschließer 33 in SB operation.

Below are some electrical schematics for the Amtsanschließer 33. The one on a plate on the bottom of the Amtsanschließer 33 case, shows the device with the handset in the cradle. Switch G has contacts I, II, III, and IV. The contacts change state when the handset is lifted from the cradle. Contacts I and II come into play, during SB operation, to provide the SB exchange with a signal that the call has ended. Component “Sch” is a buzzer that sounds when there is an incoming call.

Image
Schematic plate on the bottom of the Amtsanschließer 33.

Image
The Amtsanschließer 33 in SA/ZB operation.

Image
The Amtsanschließer 33 in SB operation – handset in the cradle.

Image
The Amtsanschließer 33 in SB operation – handset out of cradle.

Check out my new book on WW2 German field telephone equipment… https://www.lulu.com/en/us/shop/rotwang ... pageSize=4

Image

Return to “Other Equipment”