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TP-6N Norwegian field telephone

Started by dsk, March 25, 2022, 01:52:23 PM

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dsk

This was developed in Norway around 1970. Dynamic microphone/transmitter, tronsistorized generator, sounder and transmitter.

dsk

#1
Circuit:  (and I found this film: https://www.youtube.com/watch?v=4aaUFBHC4KI)

dsk

#2
Got some better pictures of the documentation so here they are:

dsk

The rest:

rdelius


dsk

Today on a market i found one with rotary dial, about $60 was a little expensive in my opinion, but still... Havent seen one for sale for years.

The handset cable was trash, the rubbe rjust fall off, and the dial had to be tuned. When that was fixed Everything works.
This was not an easy phone to take apart or put together! On the other hand it is lightweight, and works well.

Found this film about how they work: https://www.youtube.com/watch?v=ijZiHvXv0qM

dsk

Now it is working, hanging on the wall on 2 nails with a 75mm distance.
The dial has a CB/LB switch that not is in the diagram.  Works as CB on line power, or LB with batteries.

dsk

Now I have tested out the pulse rate and make breake ratio. I dd not like the result, fast speed= OK but the breakes are pretty short,  It should have been between 60 and 67 % and is only around 45%.  I did test in 2 ways, and you wil se the measurements here: