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Hi

I have bought RFT T-53/6 and RFT T-57-8.
We successfully connected all 3 devices(T-63, T-53, T-57). We can work in local loop.
Can you tell me how to work with T-57 from outside?
Where can i get a light bulb for RFT T-57/8?

Thank you

Vladimir

Hi Vladimr,

greetings, what's the rating of the lamps? Could be 24V 0,05A? It's typically printed on the lamps. They are called "Fernmeldekleinlampe".

If you want to use the FSG T57 as on a line you have to provide the line-current and the signing according
to TW39. The easy way would be I-Telex, there's a Card for that. You would then be able to communicate
with a bunch of People.

Where do you want to connect to? Do you want to use the Rotary dial to connect?

Regards

Helge

Helge hat geschrieben:Hi Vladimr,

Hi Helge

Helge hat geschrieben: greetings, what's the rating of the lamps? Could be 24V 0,05A? It's typically printed on the lamps. They are called "Fernmeldekleinlampe".

The lamp is indeed 24V 0.05A.

Helge hat geschrieben: If you want to use the FSG T57 as on a line you have to provide the line-current and the signing according
to TW39. The easy way would be I-Telex, there's a Card for that. You would then be able to communicate
with a bunch of People.

Where do you want to connect to? Do you want to use the Rotary dial to connect?

I don't really know what to do with RFT T-57 right now. I want to understand the line. Is it 40 mA loop or something else.


Right know i want to start my new device

Hi Vladimir,

" Is it 40 mA loop or something else"

Yes, it's a 40mA Loop with a Voltage of about 60 - 120 V (60 might be enough).
The singing is done by polarity reversal. That's all.

What type of plug does the RFT 57 have?

Regards

Helge

Helge hat geschrieben:Hi Vladimir,

" Is it 40 mA loop or something else"

Yes, it's a 40mA Loop with a Voltage of about 60 - 120 V (60 might be enough).
The singing is done by polarity reversal. That's all.

What type of plug does the RFT 57 have?

Regards

Helge

4 pin plug.

Hi Vladimir,

good - the same as the T63.

http://www.wasser.de/telefon-alt/datenb ... ie=1000384

In the corresponding receptacle you have to bridge b and w. Your current-limited line source goes to a and E.
Depending on the polarity your T63 will start or not.

The polarity-reversal is done by the central Office Equipment, you would have to emulate that.

Concerning the lamps - I'll search for some - but they sould be still available.

Regards

Helge

Helge hat geschrieben:Hi Vladimir,

good - the same as the T63.

http://www.wasser.de/telefon-alt/datenb ... ie=1000384

In the corresponding receptacle you have to bridge b and w. Your current-limited line source goes to a and E.
Depending on the polarity your T63 will start or not.

The polarity-reversal is done by the central Office Equipment, you would have to emulate that.

Concerning the lamps - I'll search for some - but they sould be still available.

Regards

Helge

Thank you
I will try to find lamps in Russia.