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Vintage Telephony and Telecomms Vintage Telephones, Telephony and Telecomms Equipment |
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29th Oct 2019, 6:59 pm | #1 |
Hexode
Join Date: May 2009
Location: Ryde, Isle of Wight, UK.
Posts: 419
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RJ11 lead (actually BT 431A)
Been asked by an acquaintance were he can purchase a RJ11 to bare ends lead, he wants to connect a mechanical dial type phone his current BT socket.
Any info appreciated. Ken G6HZG
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29th Oct 2019, 7:12 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,996
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Re: Rj11 lead
A BT socket isn't RJ11 - it's a "431A" connector.
I suspect what your correspondent needs is a "Cord 4/502" - which has a BT plug one end and spade-connectors the other (for connection to the tagstrip inside the phone). They used to be available from RS but it's decades since I bought one. |
29th Oct 2019, 7:16 pm | #3 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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Re: Rj11 lead
I'm confused. If the bare ends are to go into the telephone it needs a BT plug on the other end rather than an RJ11.
Such things are called Line Cords and are widely available from e-Bay and other places such as https://www.britphone.net/product-ca...n-line-cables/ If it really IS RJ11 to bare ends the easiest thing would be to get a cable with a plug at both ends and cut one off. |
29th Oct 2019, 7:41 pm | #4 |
Hexode
Join Date: May 2009
Location: Ryde, Isle of Wight, UK.
Posts: 419
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Re: Rj11 lead
Many thanks, for the replies, sorry thought the BT plug was a RJ11.
Ken G6HZG
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Life is not Hollywood, life is Cricklewood. |
29th Oct 2019, 11:23 pm | #5 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: Rj11 lead
Possibly the confusion has occured as most modern teles have an RJ11 sockets to accept a BT plug to RJ11 plug .
I used to use this sort of cable to connect Panasonic 308/616, used units to a krone strip, by cutting off the BT plug. in your case it's cut off the R11 plug . Some of these cables have man made fibres inserted in the wires , but it's easy to IDC to a krone strip. but if soldering ( and I'd suggest that this is easiest way to connect this lead to screw terminals, then - expose a decent length of the individual wires. strip back a length of insulation and remove. Then remove about 6mm of insulation and move to end of wire. Twist wire, add some flux and tin the exposed wire. Cut off the now melted insulation and the wire is now suitable to go under a screw terminal, or get crimped/soldered to a spade terminal . It might take a bit of practice, but it's possible. The leads used to be available at telephone shops on the high street. |
30th Oct 2019, 9:15 am | #6 | |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: Rj11 lead
Quote:
I take the advice to keep the stripped insulation on the wire until after applying solder to be to keep the strands together until they're firmly soldered to each other. This seems sound advice.
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31st Oct 2019, 9:31 am | #7 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,015
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Re: RJ11 lead
It was the advice with "tinsel wire" used on coiled microphone cables that you should strip a gap in the insulation as described, leaving the wire ends inside to keep them all together, then over wind in the gap using fine tinned copper wire (~40SWG).
Finally tin the lot with solder. Now the spare insulation can be cut from the end. I found it worked like a charm. |
1st Nov 2019, 12:23 am | #8 |
Nonode
Join Date: Oct 2014
Location: West Midlands, UK.
Posts: 2,181
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Re: RJ11 lead
I've found over the years that treating on solid telephone wiring as being of the type with some wire with a material insert works well. it's simply pull the plastic insulation to the end, twist and then tin ( and in doing so get rid of the inter wire threads).
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21st Jan 2020, 10:04 am | #9 |
Tetrode
Join Date: Nov 2017
Location: Bromsgrove, Worcestershire, UK.
Posts: 63
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Re: RJ11 lead
On the rare occasions I have terminated tinsel wire under a screw+washer, I stripped the insulation further back to expose the wire but kept the insulation on the end to prevent fraying.
I've never had any luck with tinsel wire in Krone strips. They're intended for solid conductors. I looked after a hotel where this had been done and spent a lot of time there with intermittent connection issues. On another occasion, Mercury C L had been to one of "my" PABXs and kroned their "least cost routing" connection into Krones that already got 2pairs in, and I had the same issues . Krones only work properly for 2 pairs even of they are all the same gauge conductors. |
21st Jan 2020, 2:16 pm | #10 |
Heptode
Join Date: May 2009
Location: Birmingham, West Midlands, UK.
Posts: 708
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Re: RJ11 lead
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