Telephone Switching > Magneto & Manual (Cord Boards etc)

Field exchanges, makes and circuit diagrams.

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dsk:
Field exchanges are made with a little different priority of functions than regular cord boards. 

Small, simple, rugged, easy to operate, and you may set up a conversions on all lines with no need for waiting for a free pair of cords.

When my father served in 1946-47 he used 2 main types of exchanges.  The US BD-71 and 72 ( https://goo.gl/5jj4Js )   the German 10 line field exchange from known as
Kleiner Klappenschrank zu 10 Leitungen ( https://goo.gl/BPDjqj )

When I served in 1982-83 we still had that German 10 line field exchange, but also the US made SB-22/PT  ( https://goo.gl/x6LJY1 )

The European part of NATO did also use the newer German field exchange, but we did not have that on our fortress.  ( https://goo.gl/ffzeXY ) (I have tried this later)

My father told me that if if you did not have to carry it on the back, the US BD-7x exchanges was the most comfortable exchange for the operator, but as fast as you had to move in to the terrain the lighter German was preferable.

The same expression is mine comparing the old German with the more modern SB-22/PT

To the reliability factor I have no problem with any of them until we talk trunk-lines.

I would like to upload the wiring diagram for the WWII German exchange, the simplest and most reliable (by my experience) of them all. (More about this may be read in this thread: https://goo.gl/QakZ6Q  )

This unit uses a regular field telephone as the operators pack.
Ff you needed a trunk-line to a CB line en external unit was used. (Norway was not fully automatized until the 1990'ies.)

dsk

dsk:
To compare, the US SB22/PT
https://i0.wp.com/www.signalcenter.com/commo/ebaylist/34tmsb22/SB22diagWeb.jpgdsk

dsk:
Here we have a German Nato 10 line unit from the 197oies:

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