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Signal Box Telephones

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Signal Box Telephones

Unread postby OnlyMe » Fri Jul 28, 2017 1:50 pm

Good Afternoon everyone, I hope I am posting in the correct place, I have acquired an old Signalbox Wall Phone


Anyone know how they are wired, I'd like to use it an an intercom, the handset has come with the wires detached so if anyone has any wiring diagrams or a general "how-to" it would be much appreciated...

http://www.ngaugeforum.co.uk/SMFN/galle ... 81654.jpeg

http://www.ngaugeforum.co.uk/SMFN/galle ... 92201.jpeg

http://www.ngaugeforum.co.uk/SMFN/galle ... 11379.jpeg

http://www.ngaugeforum.co.uk/SMFN/galle ... 91711.jpeg

http://www.ngaugeforum.co.uk/SMFN/galle ... 11937.jpeg

Thanks for reading Paul.
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Re: Signal Box Telephones

Unread postby JRB » Fri Jul 28, 2017 2:29 pm

Many types of s.b. wall phones. More details needed.
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Re: Signal Box Telephones

Unread postby John Webb » Fri Jul 28, 2017 3:57 pm

The photo of the circuit diagram shows the handset as HMT and four connections: M1, M2 for the microphone, R1 R2 for the receiver (earpiece) All you need is a simple multimeter to see which wire in the handset is connected to which terminal in the phone - and that they are the right way round, of course!

For an intercom you will need another similar unit, but I regret I am uncertain how they should be connected together.
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Re: Signal Box Telephones

Unread postby Ashley Hill » Fri Jul 28, 2017 5:30 pm

A few years since I wired one of these but from memory here goes:-
L1 and L2 are the line wires that connect your phones together,L1 to L1 L2 to L2.
+ and - are the power supply to the phone which enables you to call the opposite phone by pressing the black button.
M+ and M- power the handset to permit you to speak to each other.
Both phones will need their own sets of batteries. For ours we used two 6v batteries joined together to give 12v for the main power to each phone (+ -) then took 6v off one of the batteries for the handset supply ( M+ M-).
EB is external bell but cannot remember what CP was.
Additional phones can be added to the circuit by connecting them to the line wires.
This was on a preserved line and not mainline. Hope it works.
You may get a better reply from a telecoms expert!
Last edited by Ashley Hill on Fri Jul 28, 2017 9:08 pm, edited 1 time in total.
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Re: Signal Box Telephones

Unread postby Chris Osment » Fri Jul 28, 2017 6:15 pm

John Webb wrote:The photo of the circuit diagram shows the handset as HMT and four connections: M1, M2 for the microphone, R1 R2 for the receiver (earpiece) All you need is a simple multimeter to see which wire in the handset is connected to which terminal in the phone - and that they are the right way round, of course!


They should be colour-coded anyway, and the colours are on the circuit-diagram.

CP? - I've never did find out what that was supposed to do, as it appears to be just a piece of unconnected wire....
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Re: Signal Box Telephones

Unread postby Richard Pike » Fri Jul 28, 2017 6:45 pm

CP is a handy wire that should go from the screw terminals tom somewhere near the relay. It can be used to provide another ringing condition, perhaps via earth or the signalbox common return in place of one of the already terminated relay coil wires.
I use two D cells for M+ and M-, two PP9's in series for the calling battery with positive of the first PP9 connected to + and it's negative connected to B- and the positive of the second PP9. The negative of the second PP9 is connected to - and then adjust the bell to ring on 9v..
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Re: Signal Box Telephones

Unread postby Ashley Hill » Fri Jul 28, 2017 9:03 pm

Yes indeed the black button to ring all bells on the omnibus circuit,the red to only ring the bell on a nominated phone eg stationmaster although the handset would not be discreet.
Yes the colour codes on the diagram should help you connect your handset.
W = White M1 (or M) , R =Red R1 (or R),. G = Green R2,. B = Blue M2.
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Re: Signal Box Telephones

Unread postby StevieG » Fri Jul 28, 2017 10:29 pm

IIRC, this 'phone looks like a type which BR(WR) used to have on signal box Block shelves for discreet, direct-line communication with the next 'open' (in-switch) signal box in each direction ?
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Re: Signal Box Telephones

Unread postby TseTT » Fri Jul 28, 2017 11:47 pm

Hello,
Its an Ericsson N1182. ( see http://www.britishtelephones.com/ericsson/n1181.htm )
It can be wired to any other similar type. If the two phones are close together, a 12v supply will suffice, if not a higher voltage may be required. I prefer 24v. (connect to + and -) This is used to send to line, when a ring key is pressed and will operate the relays in the called phones.
A 12v tap off the 24v supply is used to ring the bell. (connect to B-) A separate 3- 4.5v battery is used to power the microphone. (Connect to M+ and M-) The handset connections are Blue White to the Microphone, Red Green to the receiver.
You seem to have a 164 (3 wire ) handset, it should be a 184 (4 wire). It will still work but the mic and receiver share a common return. ie link the white and red in the handset. (R2, M2)
Yours also should have a polarised relay. So it will only ring on a "Code" or black ring + to L2
The other connection are "EB" for an extension bell ( use + and EB) and CP. (Centre Point, used when a twin coil line relay fitted )
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Re: Signal Box Telephones

Unread postby Richard Pike » Sun Jul 30, 2017 9:28 am

Ashley Hill wrote:Yes indeed the black button to ring all bells on the omnibus circuit,the red to only ring the bell on a nominated phone eg stationmaster.

.

I do have a unit that uses the 'red button' to initiate a connection to a control circuit. The Controller can call this unit and connect the control circuit to the onmibus and cause a general long ring to all phones on the circuit. In both cases the connection is cleared down by the controller.
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Re: Signal Box Telephones

Unread postby Richard Pike » Sun Jul 30, 2017 5:11 pm

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Re: Signal Box Telephones

Unread postby Richard Pike » Sun Jul 30, 2017 5:40 pm

I do have a fairly good collection of railway circuit diagrams and this is the only set that mentions the battery arrangements. There is an Ely - Lynn omnibus, a buzzer phone and a control phone.

https://www.flickr.com/photos/32297024@N08/25124236041/
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Re: Signal Box Telephones

Unread postby Mike Hodgson » Sun Jul 30, 2017 6:31 pm

It is perhaps worth pointing out that a battery is better than a model railway power pack, as you don't want the hum of rectified AC on a speech circuit
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Re: Signal Box Telephones

Unread postby Chris Osment » Mon Jul 31, 2017 7:33 am

Not wishing to hi-jack a thread :-), but seeing that we are on the topic of box phones, what can anyone tell me about this example please?

http://www.trainweb.org/railwest/temp/bt-tele.jpg

The picture was taken inside the former L&SWR signal-box at Barnstaple Town station circa-1930. Clearly it has a bell on the top of the case, a mouthpiece on the front of the case and an earpiece hanging on the hook on the left. There might perhaps be a second earpiece hanging by the bottom right-hand corner?

But....was this magneto or battery ringing? I can’t see any obvious magneto handle, but neither is there any obvious button to press for ringing. Not sure about the two small items to the left of the mouthpiece.
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Re: Signal Box Telephones

Unread postby Richard Pike » Mon Jul 31, 2017 9:32 am

I have some Gent buzzer phones that look very similar. The LNER standard wiring diagrams show a circuit to fit an external bell via a bridge rectifier and relay. This may be what has happened here. I can take a photo or three if it helps.
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