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Interesting, do you have pictures? We used the SB22 here when I served, but did never need the DTMF since the "new" exchange was rotary only. (That was put in service in 1983 but used another place before) Until then it was manual in the fortress. Then when I quit they put in 2 billions (NOK)...

The tone adapters do not fit the TA 43c, only the later 312's

Manual for download: https://www.scribd.com/doc/50860239/TM-11-337-Telephone-TA-43-PT (free) dsk

Pretty old thread, but worth to wake up. T-43/TP and TA-312/TP has equal qualities in hence of plain telephony. In CB mode The phone acts as a regular telephone, no batteries needed, and the range of operation is about like a normal telephone, e.g. 14 miles on a twisted pair of common or...

It is a bit math behind this: http://mathscinotes.com/2014/05/maximum-phone-line-length-math/

Didn't look at that. :razz: They are pretty different on the other side of the border. If you look at their dial, they have placed the numbers different than every other country. In hence of this is a phone made from 1937, it is surprisingly advanced and lightweight. It is hard to give them...

Something like this: M7780-000020 LB-CB switch Operating instructions (BANV LB-CB OMK) Valid M3926-384011 TFNAPP MT Phone cradle and LB-CB switch locking are mounted in the control box (Figure 1). LB-CB switch should be set before the line is connected to contact screws La and Lb. Connection...

Hi, I see this is an old thread, but as A Norwegian I may read and understand most of it. so I could help with a translation, if it still is needed. (I do not write or speak Swedish. ) dsk