Episode 13 - Norwegian Army EB TP-6N-A, 1976 скачать в хорошем качестве

Episode 13 - Norwegian Army EB TP-6N-A, 1976

Visit http://fieldphones.org/episode13/ for additional information. The Norwegian Army field phone TP-6N was developed by A/S Elektrisk Bureau (EB, Then an Ericsson subsidiary) in the early 70ies. With 1.8kg (4lb) the instrument is very lightweight compared to other Fieldphones. The original EB designation was DPAR 00103. The instrument here presented is designated DPAR 00104/3, TP-6N-A. The difference between the initial TP-6N to the "N-A" is unknown to me. EB delivered 27000 pieces to the Norwegian Army between 1973 and the 80ies and also delivered to the dutch army and to several other countries, amongst them Finland, Spain, Colombia, Nigeria, the Filipines and others. In 1973 A/S Elektrisk Bureau were awarded the Norwegian Design Prize for this instrument. In the early 60ies EB developed one a dial instruments which uses a microphone amplifier and tone ringing through the electrodynamic microphone which was introduced on the Norwegian PTT network in 1967. The TP-6N uses a similar speech and tone ringing circuit, also using the tx side of the handset as ringer loudspeaker. Also the magneto was replaced by a transistorised ring current generator. On tp6n.blogspot.com you can find pictures of the board of a later (probably 80ies) version TP-6N-C which uses DIP packaged transistors. The handset is made of moulded plastic and also waterproof. It uses the same electrodynamic element for RX and TX. There is also an optional "snap on" dial unit to use the instrument on automatic network lines. I do not own this dial unit, only ever have seen it on pictures. As far as I can tell it was the first transistorised field instrument, and also the last military field instrument developed primarily for analog local battery networks. If now, in the 21st century, for some reason you really need an LB field instrument, it is the most useful option. tp6n.blogspot.com is very good technical resource for the the instrument, it mentions their use of the TP-6-N for cave rescue missions. Unique features No electromechanical parts, transistorised ring current generator and ring tone generator. The P.T.T. button on the handset has to be activated for talking and listening. Datasheet Size (overall): 65x85x260 mm Weight: 1.8kg (4lb) Material: Case made of impregnated canvas, body made of an extruded aluminum tube profile Waterproof: British DEF-133, Table L3 Battery: 3x 1.5V Standard D-Cell, about 3Months of typical operation Line attenuation spec.: 35db (at 800 Hz) Generator: 1.3W, 25Hz Tone ringer: 75phon, 2kHz Slim Handset, type H-67N, with P.T.T. button, waterproof Visit http://fieldphones.org/episode13/ for additional information.