✠ Swiss Army poljski telefon model 1932 - vojna rezerva

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The Swiss Army field phone "ATf 32: Armeetelefon Modell 32" was developed by Telephonwerke Albisrieden A.G., Zürich (The Swiss Siemens subsidiary since 1922, later renamed to Albiswerk Zürich AG, then to Siemens-Albis AG and finally to Siemens Schweiz AG), in the early 30ies. The goal was to replace the current lineup of Swiss army field-phones which were all based on Siemens & Halske designs from the 1910s. Compared with the German Feldfernsprecher 33 developed during the same time by Siemens & Halske the ATf 32 has a very conservative design, nearly double in weight and volume and still using a straight forward simple speech coil setup and not the more advanced anti side-tone setup all-ready used by the FF33 and most civil phone setups of that era.

The design was licensed to other Swiss telephony equipment manufacturers, Hasler (Bern), Autophon (Solothurn) and Zellweger (Uster), together with Telephonwerke Albisrieden they delivered >12000 pieces between 1932 to 1946. The first batch of about 1000 instruments was painted green/grey (body and wooden box), on the later models the body was painted black and the oak box clear-coat painted. The model in the video above is from the early manufacturing batch made by Telephonwerke Albisrieden A.G. in 1932 with serial #22. In the gallery below there are also pictures from a late model made by Autophon in 1945 with serial #10996. The instruments were in use by the Swiss army from 1933 up to 1970.

Short description from the Swiss army handbook for the ATf 32: "The army telephone model 32, referred to briefly as A. Tf. 32, is a further development of the C telephone. Simplified operation and increased speech performance are the most important improvements over this older model. The A. Tf. 32 is an instrument built according to the local battery system, which can be connected to both single-wire and double-wire lines. It may be used in local battery, central battery and automatic systems. The A. Tf. 32 can be used both as a fixed intercom or as a service telephone of a Vermittlungskästchen based switchboard, as well as for line construction and when searching for line faults. If no switchboard equipment is available, a makeshift switchboard can be created with several A. Tf. [...] The body and all accessories are installed in a solid oak box with a hinged, two-part cover. Metal protective corners and edge strips protect the box from damage. The belt hook is located on the upper side and belt locks on both sides for attaching the adjustable shoulder strap. The device can be carried as a side or back load. On the right side there are two protruding rivets into which the dial add-on can be mounted. The lid, which is closed by two lateral snap-in brackets, can be placed in any position when open, in order to serve as a rain cover for the handset when operating outdoors. The inside of the cover has two circuit diagrams of the apparatus. [...] The body is fastened in the box with two captive screws on the back. The patch-cord is stored in two blind pawls fixed inside the box. The headphones are held by a removable support. Special stop blocks with compression springs are used for the mounting of the handset."

For the handset the Swiss PTT Standard Modell 1931 is used (a very modern choice in 1932). As the instrument uses a hookswitch no P.T.T. button is added to the handset. The handset uses the PTT standard size RX elements and the Lorenz type carbon TX elements. As these instruments were in use up to 1970 the TX elements were later replaced with elements of PTT standard size type 1946 using adapter rings. The headset uses the same RX element and is put in series with the handset RX when connected. The headset socket has a built in contact which closes the circuit if the headset is not plugged in.

The buzzer used is a Telephonwerke Albisrieden development specific for this instrument which was later reused in different other field line instruments like the Feldtelephon Modell 41 and the Pionierzentrale Modell 37 (Field switchboard). The buzzer is combined with the speech coil, built into a dust-proof bakelite housing which is not intended for field repair (From the Swiss army handbook for the ATf 32: "Opening the buzzer by the troops is prohibited."). The buzzer adjusting screw is accessible without opening the buzzer housing and allows adjustment from ~450 to 550Hz.

Line sockets allow to build a small field switchboard with multiple ATf 32. Socket #1 is to be used to connect the instrument to a line from another instrument, socket #2 to connect another instrument to the local line (the local instrument is disconnected from the line when a plug is inserted into socket #2). A respective patch cord is available in every ATf 32.

The optional external dial unit Wählerzusatz 32 is contained in it's own wooden box (also painted green for earlier models and clear coated for later models) and can be mounted to the side of the main instrument box. The dial unit is connected to the automatic network line and then with the patch cord to socket #1. The dial installed is a Swiss PTT standard Zenith dial. Earlier models use the type 4 dial, and later models the type 5 dial which was introduced by the Swiss PTT in the mid 30ies. The type 5 dial adds an additional shorted out dial pulse to increase the pause between individual dialled numbers and in such way decrease wrong dialling (with a type 4 dial if dialling e.g. 1 - 1 fast sequence it might be interpreted as 2 by the CO equipment, with the additional dial step there is always a forced pause of 1 dial pules length between dialled numbers).
Unique features

The Lauthörtaste allows to shorten the secondary winding putting the handset and headset RX directly into the receiving circuit for an increased receive volume.
The generator handle is foldable and fix connected to the instrument, hence can not be lost.
Slide out handset cradle.

Datasheet ATf 32

Size: 330 x 140 x 240 mm
Weight: 9.6kg including batteries
Material: Oak case, light alloy body, leather carrying strap
Battery: 2x 1,5V, Swiss Leclanché Lagerelement (Inert zinc-carbon element, activated by adding water, Size IEC S4)
Noble gas lightning arrestors
400 Ohm Albiswerk Magneto
1000 Ohm Ringer
500Hz Buzzer combined with 2 winding speech coil, P: 2,3 Ohm, S: 170 Ohm
PTT Standard 1931 Bakelite Handset, Bakelite Headset