top of page

The German PupinspuleFeldfernkabel Connector


The German PupinspuleFeldfernkabel


While searching for aircraft wreckage at the site, I stumbled on something of a mystery in the field. At first thought, I believed it to be a part of the aircraft, but it had Siemens stamped on it, I had my doubts. That is not of strangeness because there are some parts made by German companies for our aircraft, Bosch USA for one, made the magnetos for the engines for controlling the firing of the plugs and timing. But thanks to my colleague, Pascal, who is German and happened to recognize the Siemens mark as a wartime stamp, and the fact the thing also had a Waffenamt (WaA) stamp on it, (577) electrical equipment, Siemens & Halske Berlin (Be) 1938- 42. The conclusion was the fact that it had to be of something from the German army. My best guess was that it was a coupler of some kind, but was thinking water or antenna. A week later Pascal had it solved, it was called a “PUPINSPULEN”, a pooping what? It was an electrical connector for electricity supplied from generators to most likely communication equipment, or van, could even be high powered spotlights for spotting aircraft? Whatever it was used for we found the answer. I have found a site with a description, first in English than German.

The coil sleeve consists of a cylindrical part, two connectors, and two coupling halves. Two Puppin coils are installed inside the cylinder and cast with a high-quality insulating compound. The sleeve cylinder is closed at both ends by a watertight, four-pin clamping plate made of the molding compound. The seal between the clamping plate and the cylinder is made using a rubber seal. The plug-in device, which is completely identical on both sides, corresponds to that of the end plug, there are two opposite poles connected to a coil and labeled 1-1 and 2-2. The bayonet-shaped coupling halves are firmly screwed onto the spool sleeve and are coupled to make the connection with the loose coupling halves of the end connector.
The position of the pair of wires 1 is also visibly and noticeably identified by a 2 cm long night mark on the outer jacket of the coil sleeve. When coupling the plug device together, make sure that the rib is in line with the mark on the lug of the end plug.

The self-induction coil was invented in 1894 by Michael Pupin * 04.10.1854 + 12.03.1935

Die Spulenmuffe besteht aus einem zylindrischen Teil, zwei Steckvorrichtungen und zwei Kupplungshälften. Im Inneren des Zylinders sind zwei Pupinspulen eingebaut und mit einer hochwertigen Isoliermasse vergossen. Der Muffenzylinder ist an beiden Enden durch je eine wasserdichte eingesetzte, vierpolige Klemmplatte aus Pressmasse abgeschlossen. Die Abdichtung zwischen Klemmplatte und Zylinder erfolgt durch eine Gummidichtung. Die Steckvorrichtung, die an beiden Seiten völlig gleich sind, entsprechen denen der Endstecker, es sind je zwei gegenüberliegende Pole mit einer Spule verbunden und mit 1-1 und 2-2 bezeichnet. Die bajonettartigen ausgebildeten Kupplungshälften sind auf der Spulenmuffe fest aufgeschraubt und werden zur Herstellung der Verbindung mit den losen Kupplungshälften der Endstecker gekuppelt. Die Lage des Aderpaares 1 ist auch hier durch eine 2 cm lange Nachtmarke auf dem Aussenmantel der Spulenmuffe sicht- und fühlbar gekennzeichnet. Beim Zusammenkuppeln der Steckvorrichtung ist darauf zu achten das die Rippe mit derer auf der Keule des Endsteckers befindliche Marke in einer Linie liegt.

Erfunden wurde die Selbstinduktionsspule 1894 von Michael Pupin * 04.10.1854  + 12.03.1935


An interesting conversation piece, with a name not to forget.


Here are couple pictures of filed use.

bottom of page