Home


Episode 54 - Poljski Telefon M-63 (Yugoslavia), 1963

Description

This is the Yugoslav People's Army field telephone developed in the early 60ies as successor to the PTI-49 [1]. The instrument's overall design is clearly based on the US TA-43/PT, though the handset is based on the Swiss FTf50 (Based on other products there may have been some cooperation between Swiss Siemens and Iskra) and the lid locks on the Swedish m/37.

From Regulations for Inductor Telephone M-63 [1]:

The inductor telephone M-63 is intended for maintaining telephone connections in all units of the JNA (Yugoslav People's Army) primarily in field conditions. To work over automatic telephone exchanges, the M-63 telephone must use dial unit BN-1.
The M-63 phone enables:

Standout features

Datasheet

Gallery

Disassembled.

The diagram is glued to the inside of the enclosing (on this one glue did not hold anymore and it fell out).

The handset opened (The TX capsule made by Tesla, Czechoslovakia). The handset is very similar to the handset of the Swiss FTf 50.

Mounted into the bottom the buzzer (ZU) and the magneto.

Mounted to the underside of the lid from left to right: speech coil, choke coil, hook switch, buzzer volume (mechanical clutch), test button, mode switch, handset connectors and line binding posts.

Speech coil (anti-sidetone setup) and below the choke coil.

On the battery lid underside an indication on how to put the batteries.

Battery compartment.

On top left an external battery can be connected. The handset is held by a spring on the TX side. In the middle the buzzer volume (ZU), the line test button (ID) and the mode button (R, LB, CB). The top setup is clearly inspired by the US TA-43/PT.

The handset "MK-1-A" with P.T.T. lever.

The handsetcompared to the handset of the Swiss FTf 50, the "MK-1-A" is clearly based on the latter.

The dial unit opened.

There is a small diagram inside the dial unit.

Dial unit "BN-1" made in 1986. "Brojcanik za polski telefon M-63" (Dial unit for field telephone M-63).

Ready to pack up.

Ready to use on a CB/Aut. line.

Ready for transport.

The mechanism to close the lid is taken from the Swedish m/37.

Inside the top lid a user guide: "HANDLING THE M-63 TELEPHONE"

  1. Connect to a 3V battery.
  2. Put the R-LB-CB switch in the LB position.
  3. Short out the terminals La and Lb, press the ID button, turn the inductor coil and adjust the bell sound with the handle.
  4. Press the switch of the MK-1a combination and blow into the microphone, a hum must be heard in the earpiece.
  5. Put the switch R-LB-CB in position: R - for operation via radio device, LB- for operation via LB switchboard, CB - for operation via CB switchboard.
  6. To use on an automatic network connect the dial unit to terminals La and Lb on the phone.

User guide contd.:

  1. Connect the line to terminals La and Lb on the telephone, or on the dial.
  2. To call: - use inductor when calling an LB-central or radio device, - lift the MK-1a handset from the cradle when calling a manual CB switchboard, - lift the MK-1a handset from the cradle and dial the number when calling on an automatic network.
  3. When speaking, hold down the switch on the MK-1a, release it to listen.
  4. When using in a CB or automatic line put the MK-1a back into the bracket to go on-hook.

The spelling table on the top lid outside.

Label with what is assumed to be a serial number.

To illustrate the relation between Iskra and Albiswerk Z├╝rich ("Swiss Siemens") on the left a Albiswerk ST 511, on the right an Iskra ATA 11. ATA 11 telephones are also clearly based on a Albiswerk product, the ST511 (a desk telephone for private networks, in Switzerland a major customer for these sets were the Swiss railway company SBB).

Bottom side of ST511 and ATA 11. The "bee - ring" switch locks the ringer lever in the "bee" position resulting in a buzz instead of a ring.

Bottom open. The Albiswerk ST511 uses the same coil as speech and ringer coil. The Iskra ATA 11 uses a traditional setup.

Inside open. The Albiswerk ST511 uses fix connection "plates" instead of wires, and connects to the dial via spring contacts. The Iskra ATA 11 again uses a traditionally wird setup.

Sources


Creative Commons Attribution-ShareAlike 4.0 International License

Home